Total................................................................... 111.1 72.1 7.6 7.8 16.7 6.9

Do Not Have Cooling Equipment..................... 17.8 10.9 1.5 1.5 2.8 1.2

Have Cooling Equipment................................. 93.3 61.2 6.1 6.3 13.9 5.8

Use Cooling Equipment................................... 91.4 60.3 6.0 6.1 13.5 5.5

Have Equipment But Do Not Use it................. 1.9 1.0 Q 0.2 0.4 Q

Type of Air-Conditioning Equipment1, 2

Central System.............................................. 65.9 47.5 4.0 2.8 7.9 3.7

Without a Heat Pump.................................. 53.5 37.8 3.4 2.2 7.0 3.1

With a Heat Pump....................................... 12.3 9.7 0.6 0.5 1.0 0.6

Window/Wall Units........................................ 28.9 14.9 2.3 3.5 6.0 2.1

1 Unit........................................................... 14.5 6.6 1.0 1.6 4.2 1.2

2 Units......................................................... 9.1 4.6 0.9 1.4 1.5 0.6

3 or More Units............................................ 5.4 3.7 0.5 0.5 0.3 0.3

Central Air-Conditioning Usage

Air-Conditioned Floorspace (Square Feet)

None............................................................ 45.2 24.6 3.6 5.0 8.8 3.2

1 to 499....................................................... 3.9 2.0 0.3 0.4 0.8 0.5

500 to 999................................................... 15.0 6.8 1.1 1.4 4.3 1.5

1,000 to 1,499............................................. 15.6 10.2 1.0 0.8 2.3 1.3

1,500 to 1,999............................................. 11.1 9.9 0.5 Q 0.4 Q

2,000 to 2,499............................................. 7.0 6.1 0.6 Q Q Q

2,500 to 2,999............................................. 5.2 4.8 QQQQ

3,000 or 3,499............................................. 2.7 2.6 Q N N N

3,500 to 3,999............................................. 1.8 1.7 Q N Q N

4,000 or More.............................................. 3.5 3.3 Q N Q N

Number of Rooms Centrally

Air-Conditioned in Summer 2005

None............................................................ 1.4 0.7 QQQQ

1.................................................................. 0.7 Q N Q 0.4 Q

2.................................................................. 2.1 1.0 Q Q 0.7 0.2

3.................................................................. 7.5 3.8 0.7 0.6 2.0 0.4

4.................................................................. 7.9 2.8 0.8 0.6 2.6 1.0

5 or More..................................................... 46.3 38.9 2.3 1.3 2.0 1.9

Proportion of Rooms Air-Conditioned

None............................................................ 1.4 0.7 QQQQ

Some, But Not all of the Rooms.................. 8.4 6.7 0.7 Q 0.5 0.4

All of the Rooms.......................................... 56.1 40.0 3.2 2.6 7.2 3.1

Frequency of Central Air-Conditioner Use

Never........................................................... 1.4 0.7 QQQQ

Only a Few Times When Needed................ 11.4 7.4 1.1 0.6 1.8 0.5

Quite a Bit................................................... 12.6 8.7 1.0 0.5 1.8 0.7

All Summer.................................................. 40.5 30.7 1.8 1.6 4.1 2.3

Apartments in Buildings 

With-- Housing 

Units 

(millions)

Single-Family Units

Detached

Type of Housing Unit

Table HC2.7 Air Conditioning Usage Indicators by Type of Housing Unit, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators Attached 2 to 4 Units 5 or More 

Units

Mobile 

Homes

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Apartments in Buildings 

With-- Housing 

Units 

(millions)

Single-Family Units

Detached

Type of Housing Unit

Table HC2.7 Air Conditioning Usage Indicators by Type of Housing Unit, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators Attached 2 to 4 Units 5 or More 

Units

Mobile 

Homes

At Home Behavior

Home Used for Business

Yes.......................................................... 6.4 5.4 Q Q 0.4 Q

No............................................................ 59.5 42.0 3.7 2.6 7.6 3.5

Someone Home All Day

Yes.......................................................... 32.7 25.0 1.7 1.4 3.0 1.7

No............................................................ 33.1 22.5 2.3 1.4 5.0 2.0

Housing Unit Characteristics Affecting Usage

Large Tree(s) that Shade the Home

Yes.............................................................. 31.6 25.7 1.7 0.7 2.0 1.4

No............................................................... 34.3 21.7 2.3 2.1 5.9 2.3

Adequacy of Insulation

Well Insulated.............................................. 29.5 22.4 1.4 1.3 3.3 1.2

Adequately Insulated................................... 27.9 19.9 2.0 1.0 3.4 1.6

Poorly Insulated........................................... 7.3 4.7 0.5 0.4 0.9 0.8

No Insulation............................................... 0.3 Q N Q Q Q

Don't Know.................................................. 0.9 0.3 Q Q 0.3 Q

Home Is Too Drafty During the Winter

Never........................................................... 42.6 31.5 2.5 1.7 4.8 2.2

Some of the Time........................................ 16.3 11.9 1.1 0.7 1.7 1.0

Most of the Time.......................................... 2.5 1.7 Q Q 0.4 Q

All of the Time............................................. 2.2 1.2 0.2 Q 0.4 Q

Don't Know.................................................. 2.2 1.2 Q Q 0.7 Q

Unusually High Ceilings

Yes.............................................................. 20.3 17.7 1.3 0.5 0.8 N

No............................................................... 41.9 29.8 2.6 2.3 7.1 N

Not Asked (Mobile Homes).......................... 3.7 N N N N 3.7

Cathederal Ceilings

(In Housing Units with High Ceilings)

Yes....................................................... 13.5 11.9 1.0 Q 0.5 N

No........................................................ 6.7 5.8 0.3 0.3 0.3 N

Type of Glass in Windows

Single-pane Glass....................................... 27.4 16.9 1.5 1.7 4.7 2.5

Double-pane Glass

Without Low-e Coating............................. 31.5 24.1 2.2 1.0 3.0 1.2

With Low-e Coating.................................. 5.8 5.5 0.3 Q Q Q

Triple-pane Glass

Without Low-e Coating............................. 0.8 0.7 N N Q N

With Low-e Coating.................................. Q Q N Q N N

Proportion of Windows Replaced

All................................................................ 11.5 9.2 0.9 Q 0.7 Q

Some........................................................... 11.1 9.8 0.4 Q 0.4 0.4

None............................................................ 40.9 27.9 2.3 1.8 5.9 3.0

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Apartments in Buildings 

With-- Housing 

Units 

(millions)

Single-Family Units

Detached

Type of Housing Unit

Table HC2.7 Air Conditioning Usage Indicators by Type of Housing Unit, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators Attached 2 to 4 Units 5 or More 

Units

Mobile 

Homes

Thermostats

Thermostat Available During Summer

Yes.............................................................. 63.9 46.4 3.7 2.5 7.6 3.6

No............................................................... 1.9 1.1 Q Q 0.3 Q

Do Not Use Central Air-Conditioning........... 45.2 24.6 3.6 5.0 8.8 3.2

Use a Programmable Thermostat

Yes....................................................... 25.0 20.5 1.3 0.8 1.7 0.6

No........................................................ 38.9 25.9 2.4 1.7 5.9 3.0

Use of Programmable Thermostats

Reduces Temperature During Day

Yes.......................................................... 15.1 12.4 0.8 0.5 1.1 0.4

No............................................................ 9.9 8.1 0.5 0.3 0.7 0.3

Reduces Temperature at Night

Yes.......................................................... 15.4 12.7 0.8 0.5 1.0 0.4

No............................................................ 9.6 7.8 0.5 0.3 0.7 0.2

Do Not Use Central Air-Conditioning........... 45.2 24.6 3.6 5.0 8.8 3.2

Summer 2005 Temperature Settings

Higher Temperature Settings

Daytime When No One is Home

Yes.......................................................... 0.5 0.3 Q N Q Q

No............................................................ 50.8 38.1 2.5 1.9 5.4 2.9

Unknown.................................................. 14.5 9.1 1.4 0.9 2.3 0.8

Do Not Use Central Air-Conditioning........ 45.2 24.6 3.6 5.0 8.8 3.2

At Night During Sleeping Hours

Yes.......................................................... 7.3 6.0 0.3 Q 0.4 0.5

No............................................................ 44.3 32.5 2.3 1.8 5.3 2.5

Unknown.................................................. 14.2 9.0 1.4 0.8 2.3 0.8

Do Not Use Central Air-Conditioning........... 45.2 24.6 3.6 5.0 8.8 3.2

Daytime Setting When Someone is Home

Air Conditioner Turned On........................... 52.0 38.8 2.6 2.0 5.7 2.9

69 Degrees or Less.................................. 4.8 2.8 0.5 Q 1.0 0.3

70 Degrees.............................................. 7.2 5.0 0.4 0.3 1.2 0.4

71 to 73 Degrees..................................... 8.8 6.7 0.6 0.3 0.7 0.5

74 to 76 Degrees..................................... 16.5 12.5 0.8 0.6 1.6 0.9

77 to 79 Degrees..................................... 11.1 8.8 0.3 0.4 0.9 0.6

80 Degrees or More................................. 3.7 3.0 Q Q 0.4 Q

Dont Know/No Answer............................. 1.1 0.5 QQQQ

Do Not Use Central Air Conditioning............ 45.2 24.6 3.6 5.0 8.8 3.2

Daytime Setting When No One is at Home

Air Conditioner Turned On........................... 49.5 37.2 2.4 1.8 5.2 2.9

69 Degrees or Less.................................. 3.6 2.2 0.3 Q 0.6 0.2

70 Degrees.............................................. 5.2 3.3 0.3 Q 1.0 0.3

71 to 73 Degrees..................................... 6.0 4.7 0.4 Q 0.4 0.3

74 to 76 Degrees..................................... 13.8 10.3 0.7 0.6 1.4 0.9

77 to 79 Degrees..................................... 10.7 8.6 Q 0.4 0.9 0.6

80 Degrees or More................................. 10.2 8.1 0.5 Q 0.9 0.6

Dont Know/No Answer............................. 1.6 0.9 QQQQ

Air-Conditioner Turned Off........................... 2.0 1.3 Q Q 0.5 Q

Do Not Use Central Air Conditioning............ 45.2 24.6 3.6 5.0 8.8 3.2

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Apartments in Buildings 

With-- Housing 

Units 

(millions)

Single-Family Units

Detached

Type of Housing Unit

Table HC2.7 Air Conditioning Usage Indicators by Type of Housing Unit, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators Attached 2 to 4 Units 5 or More 

Units

Mobile 

Homes

Setting During Sleeping Hours

Air Conditioner Turned On 51.0 38.0 2.5 1.9 5.7 2.9

69 Degrees or Less.................................. 5.7 3.7 0.5 Q 0.9 0.4

70 Degrees.............................................. 7.7 5.3 0.3 Q 1.2 0.5

71 to 73 Degrees..................................... 8.3 6.3 0.6 0.4 0.6 0.5

74 to 76 Degrees..................................... 15.5 11.6 0.7 0.6 1.8 0.8

77 to 79 Degrees..................................... 9.7 7.8 Q 0.3 0.9 0.4

80 Degrees or More................................. 4.1 3.2 Q N 0.4 0.3

Dont Know/No Answer............................. 1.3 0.8 QQQQ

Air-Conditioner Turned Off........................... 0.8 0.6 QQQQ

Do Not Use Central Air Conditioning............ 45.2 24.6 3.6 5.0 8.8 3.2

Dehumidifier Use Each Year

Use a Humidifier............................................. 13.3 11.7 0.8 0.5 0.3 Q

1 to 3 Months Each Year............................. 5.1 4.3 0.2 0.3 0.3 N

4 to 6 Months Each Year............................. 4.4 4.0 0.3 Q Q Q

7 to 9 Months Each Year............................. 0.9 0.9 Q Q N N

10 to 11 Months........................................... Q Q NNNN

Turned on All Year Long.............................. 2.6 2.3 Q Q Q N

Do Not Use a Dehumidifier.............................. 97.8 60.4 6.8 7.3 16.4 6.9

Window/Wall Air Conditioners

Frequency Most Used Unit Was Used

Never........................................................... 0.6 0.3 N Q Q Q

Only a Few Times When Needed................ 12.1 6.6 0.9 1.4 2.5 0.6

Quite a Bit................................................... 7.5 4.0 0.7 0.9 1.4 0.6

All Summer.................................................. 8.6 4.0 0.8 1.0 1.9 0.9

Energy Star Wall/Window (Most-Used) Unit

Yes.............................................................. 4.6 2.4 0.4 0.5 0.7 0.5

No............................................................... 2.7 1.2 0.2 0.4 0.5 0.4

Don't Know.................................................. 7.0 3.3 0.6 1.3 1.6 0.2

Unit is More than 4 Years Old...................... 14.6 7.9 1.2 1.3 3.2 1.0

Use a Swamp Cooler (Asked Only in Arid Areas)

Yes................................................................. 3.4 2.0 0.2 Q Q 0.9

No................................................................... 41.9 28.2 2.1 2.3 6.1 3.2

Not Asked....................................................... 65.8 41.9 5.2 5.3 10.6 2.9

 1. In the 2005 RECS 1.5 million housing units reported having both central and window/wall air conditioners.

 2. The number of housing units using air-conditioning includes a small, undetermined number of housing units where the fuel for 

central air-conditioning was some fuel other than electricity; these housing units were treated as if the air-condtioning fuel was electricity.

 Q = Data withheld either because the Relative Standard Error (RSE) was greater than 50 percent or fewer than 10 households were 

sampled.

 N = No cases in reporting sample.

 Notes: ● Because of rounding, data may not sum to totals. ● See Glossary for definition of terms used in these tables.

 Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 2005 

Residential Energy Consumption Survey.

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Total.................................................................. 111.1 78.1 64.1 4.2 1.8 2.3 5.7

Do Not Have Cooling Equipment..................... 17.8 11.3 9.3 0.6 Q 0.4 0.9

Have Cooling Equipment................................. 93.3 66.8 54.7 3.6 1.7 1.9 4.8

Use Cooling Equipment.................................. 91.4 65.8 54.0 3.6 1.7 1.9 4.7

Have Equipment But Do Not Use it................. 1.9 1.1 0.8 Q N Q Q

Type of Air-Conditioning Equipment1, 2

Central System.............................................. 65.9 51.7 43.9 2.5 0.7 1.6 3.1

Without a Heat Pump.................................. 53.5 41.1 34.8 2.1 0.5 1.2 2.6

With a Heat Pump....................................... 12.3 10.6 9.1 0.4 Q 0.3 0.6

Window/Wall Units....................................... 28.9 16.5 12.0 1.3 1.0 0.4 1.7

1 Unit.......................................................... 14.5 7.2 5.4 0.5 0.2 Q 0.9

2 Units......................................................... 9.1 5.5 3.7 0.5 0.6 Q 0.6

3 or More Units............................................ 5.4 3.8 2.9 0.4 Q N 0.2

Central Air-Conditioning Usage

Air-Conditioned Floorspace (Square Feet)

None........................................................... 45.2 26.4 20.2 1.7 1.1 0.7 2.6

1 to 499....................................................... 3.9 2.4 1.7 Q Q Q 0.4

500 to 999................................................... 15.0 8.3 6.1 0.5 Q 0.5 1.1

1,000 to 1,499............................................. 15.6 11.6 8.9 0.4 Q 0.6 1.3

1,500 to 1,999............................................. 11.1 10.2 9.4 0.4 Q Q Q

2,000 to 2,499............................................. 7.0 6.6 5.9 0.4 Q Q Q

2,500 to 2,999............................................. 5.2 4.8 4.5 QQQQ

3,000 or 3,499............................................. 2.7 2.6 2.6 Q N N N

3,500 to 3,999............................................. 1.8 1.8 1.7 Q N Q N

4,000 or More.............................................. 3.5 3.4 3.2 Q N Q N

Number of Rooms Cooled by Central

Air-Conditioning in Summer 2005

None........................................................... 1.4 0.8 0.6 Q N Q Q

1.................................................................. 0.7 Q Q N N Q Q

2.................................................................. 2.1 1.2 0.9 Q N Q Q

3.................................................................. 7.5 4.7 3.6 0.4 Q Q 0.4

4.................................................................. 7.9 4.4 2.5 0.3 Q 0.6 0.8

5 or More..................................................... 46.3 40.4 36.1 1.6 0.4 0.5 1.7

Proportion of Rooms Air-Conditioned

None........................................................... 1.4 0.8 0.6 Q N Q Q

Some, But Not all of the Rooms.................. 8.4 7.2 6.3 0.5 Q Q 0.4

All of the Rooms.......................................... 56.1 43.7 37.0 1.9 0.7 1.4 2.7

Frequency of Central Air-Conditioner Use

Never.......................................................... 1.4 0.8 0.6 Q N Q Q

Only a Few Times When Needed................ 11.4 8.8 7.0 0.9 Q 0.4 0.4

Quite a Bit................................................... 12.6 9.7 8.2 0.5 Q Q 0.6

All Summer................................................. 40.5 32.3 28.1 1.0 0.4 0.9 2.0

Table HC3.7 Air-Conditioning Usage Indicators by Owner-Occupied Housing Unit, 2005

 OwnerOccupied 

Housing 

Units 

(millions)

Type of Owner-Occupied Housing Unit

U.S.

Housing 

Units 

(millions

Single-Family Units Apartments in 

Buildings With--

Air Conditioning Usage Indicators Detached Attached 2 to 4 

Units

5 or More 

Units

Mobile 

Homes

 Million U.S. Housing Units

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC3.7 Air-Conditioning Usage Indicators by Owner-Occupied Housing Unit, 2005

 OwnerOccupied 

Housing 

Units 

(millions)

Type of Owner-Occupied Housing Unit

U.S.

Housing 

Units 

(millions

Single-Family Units Apartments in 

Buildings With--

Air Conditioning Usage Indicators Detached Attached 2 to 4 

Units

5 or More 

Units

Mobile 

Homes

 Million U.S. Housing Units

At Home Behavior

Home Used for Business

Yes.......................................................... 6.4 5.7 5.1 QQQQ

No........................................................... 59.5 46.0 38.7 2.2 0.7 1.5 2.9

Someone Home All Day

Yes.......................................................... 32.7 27.0 23.2 1.1 0.3 0.8 1.5

No........................................................... 33.1 24.8 20.6 1.4 0.4 0.7 1.6

Housing Unit Characteristics Affecting Usage

Large Tree(s) that Shade the Home

Yes............................................................. 31.6 26.9 24.0 1.1 Q 0.4 1.2

No............................................................... 34.3 24.9 19.9 1.4 0.5 1.2 1.9

Adequacy of Insulation

Well Insulated............................................. 29.5 24.2 21.2 1.0 0.4 0.6 1.1

Adequately Insulated................................... 27.9 22.2 18.5 1.3 Q 0.7 1.5

Poorly Insulated.......................................... 7.3 4.9 3.9 Q Q Q 0.5

No Insulation............................................... 0.3 Q Q N N Q Q

Don't Know.................................................. 0.9 Q Q N N Q Q

Home Is Too Drafty During the Winter

Never.......................................................... 42.6 35.0 29.6 1.7 0.6 1.1 2.0

Some of the Time........................................ 16.3 12.6 10.9 0.6 Q Q 0.7

Most of the Time......................................... 2.5 1.7 1.4 Q N Q Q

All of the Time............................................. 2.2 1.3 1.0 Q N Q Q

Don't Know.................................................. 2.2 1.1 1.0 Q N Q Q

Unusually High Ceilings

Yes............................................................. 20.3 18.5 16.9 1.1 Q Q N

No............................................................... 41.9 30.1 27.0 1.4 0.5 1.3 N

Not Asked (Mobile Homes)......................... 3.7 3.1 N N N N 3.1

Cathederal Ceilings

(In Housing Units with High Ceilings)

Yes...................................................... 13.5 12.6 11.5 0.9 Q Q N

No........................................................ 6.7 5.9 5.4 Q Q Q N

Type of Glass in Windows

Single-pane Glass....................................... 27.4 18.2 14.5 0.6 Q 0.8 2.1

Double-pane Glass

Without Low-e Coating............................ 31.5 26.9 23.1 1.6 0.4 0.7 1.1

With Low-e Coating................................. 5.8 5.7 5.3 0.3 Q Q Q

Triple-pane Glass

Without Low-e Coating............................ 0.8 0.7 0.7 NNNN

With Low-e Coating................................. Q Q Q N Q N N

Proportion of Windows Replaced

All................................................................ 11.5 9.7 8.6 0.6 Q Q Q

Some.......................................................... 11.1 10.2 9.5 0.3 Q Q 0.3

None........................................................... 40.9 31.3 25.3 1.5 0.6 1.2 2.6

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC3.7 Air-Conditioning Usage Indicators by Owner-Occupied Housing Unit, 2005

 OwnerOccupied 

Housing 

Units 

(millions)

Type of Owner-Occupied Housing Unit

U.S.

Housing 

Units 

(millions

Single-Family Units Apartments in 

Buildings With--

Air Conditioning Usage Indicators Detached Attached 2 to 4 

Units

5 or More 

Units

Mobile 

Homes

 Million U.S. Housing Units

Thermostats

Thermostat Available During Summer

Yes............................................................. 63.9 50.4 42.9 2.3 0.6 1.6 3.1

No............................................................... 1.9 1.3 0.9 Q Q N Q

Do Not Use Central Air-Conditioning........... 45.2 26.4 20.2 1.7 1.1 0.7 2.6

Use a Programmable Thermostat

Yes...................................................... 25.0 21.7 19.4 1.1 Q 0.6 0.5

No........................................................ 38.9 28.7 23.6 1.2 0.4 1.0 2.6

Use of Programmable Thermostats

Adjusts Temperature During Day

Yes.......................................................... 15.1 13.3 11.8 0.7 Q 0.4 0.3

No........................................................... 9.9 8.4 7.6 0.4 Q Q Q

Adjusts Temperature at Night

Yes.......................................................... 15.4 13.6 12.2 0.7 Q 0.4 0.3

No........................................................... 9.6 8.1 7.2 0.4 Q Q Q

Do Not Use Central Air-Conditioning........... 45.2 26.4 20.2 1.7 1.1 0.7 2.6

Summer 2005 Temperature Settings

Higher Temperature Settings

Daytime When No One is Home

Yes.......................................................... 0.5 Q Q N N Q Q

No........................................................... 50.8 40.7 35.1 1.5 0.5 1.0 2.5

Unknown................................................. 14.5 10.8 8.5 1.0 Q 0.5 0.6

Do Not Use Central Air-Conditioning....... 45.2 26.4 20.2 1.7 1.1 0.7 2.6

At Night During Sleeping Hours

Yes.......................................................... 7.3 6.7 5.8 Q Q Q 0.5

No........................................................... 44.3 34.4 29.6 1.3 0.5 1.0 2.1

Unknown................................................. 14.2 10.7 8.4 1.0 Q 0.5 0.6

Do Not Use Central Air-Conditioning........... 45.2 26.4 20.2 1.7 1.1 0.7 2.6

Daytime Setting When Someone is Home

Air Conditioner Turned On........................... 52.0 41.4 35.8 1.5 0.5 1.0 2.6

69 Degrees or Less................................. 4.8 3.1 2.5 0.3 Q Q Q

70 Degrees.............................................. 7.2 5.3 4.6 Q N Q 0.4

71 to 73 Degrees..................................... 8.8 7.1 6.1 0.3 Q Q 0.5

74 to 76 Degrees..................................... 16.5 13.0 11.3 0.5 Q Q 0.7

77 to 79 Degrees..................................... 11.1 9.7 8.4 Q Q Q 0.6

80 Degrees or More................................. 3.7 3.2 2.8 Q N Q Q

Dont Know/No Answer............................. 1.1 0.6 0.5 Q N Q Q

Do Not Use Central Air Conditioning........... 45.2 26.4 20.2 1.7 1.1 0.7 2.6

Setting When No On is at Home

Air Conditioner Turned On........................... 49.5 39.7 34.3 1.4 0.5 1.0 2.5

69 Degrees or Less................................. 3.6 2.4 1.9 QQQQ

70 Degrees.............................................. 5.2 3.6 3.0 Q N Q 0.3

71 to 73 Degrees..................................... 6.0 4.7 4.2 Q N Q 0.3

74 to 76 Degrees..................................... 13.8 10.8 9.3 0.4 Q Q 0.6

77 to 79 Degrees..................................... 10.7 9.2 8.1 Q Q Q 0.6

80 Degrees or More................................. 10.2 8.9 7.7 0.3 Q Q 0.6

Dont Know/No Answer............................. 1.6 1.0 0.8 Q N N Q

Air-Conditioner Turned Off.......................... 2.0 1.4 1.2 Q Q Q N

Do Not Use Central Air Conditioning........... 45.2 26.4 20.2 1.7 1.1 0.7 2.6

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC3.7 Air-Conditioning Usage Indicators by Owner-Occupied Housing Unit, 2005

 OwnerOccupied 

Housing 

Units 

(millions)

Type of Owner-Occupied Housing Unit

U.S.

Housing 

Units 

(millions

Single-Family Units Apartments in 

Buildings With--

Air Conditioning Usage Indicators Detached Attached 2 to 4 

Units

5 or More 

Units

Mobile 

Homes

 Million U.S. Housing Units

Setting During Seeping Hours

Air Conditioner Turned On 51.0 40.6 35.0 1.5 0.5 1.1 2.5

69 Degrees or Less................................. 5.7 4.2 3.4 0.3 Q Q 0.2

70 Degrees.............................................. 7.7 5.7 4.9 Q N Q 0.5

71 to 73 Degrees..................................... 8.3 6.7 5.7 0.3 Q Q 0.5

74 to 76 Degrees..................................... 15.5 12.2 10.5 0.5 Q 0.4 0.6

77 to 79 Degrees..................................... 9.7 8.4 7.4 Q Q Q 0.4

80 Degrees or More................................. 4.1 3.5 3.0 Q N Q Q

Dont Know/No Answer............................. 1.3 0.8 0.7 Q N N Q

Air-Conditioner Turned Off.......................... 0.8 0.6 0.6 Q N N Q

Do Not Use Central Air Conditioning........... 45.2 26.4 20.2 1.7 1.1 0.7 2.6

Dehumidifier Use Each Year

Use a Humidifier............................................. 13.3 12.1 11.1 0.6 0.3 Q Q

1 to 3 Months Each Year............................. 5.1 4.5 4.1 Q Q Q N

4 to 6 Months Each Year............................. 4.4 4.2 3.8 0.3 Q N Q

7 to 9 Months Each Year............................. 0.9 0.9 0.8 Q Q N N

10 to 11 Months.......................................... Q Q Q NNNN

Turned on All Year Long............................. 2.6 2.3 2.2 Q Q N N

Do Not Use a Dehumidifier............................. 97.8 66.0 53.0 3.6 1.5 2.2 5.7

Window/Wall Air Conditioners

Frequency Most Used Unit Was Used

Never.......................................................... 0.6 0.3 0.3 N N N Q

Only a Few Times When Needed................ 12.1 7.2 5.4 0.6 0.5 Q 0.5

Quite a Bit................................................... 7.5 4.6 3.3 0.4 0.3 Q 0.5

All Summer................................................. 8.6 4.4 3.1 0.3 Q Q 0.8

Energy Star Wall/Window (Most-Used) Unit

Yes............................................................. 4.6 2.9 2.0 0.2 Q Q 0.4

No............................................................... 2.7 1.4 0.9 Q N Q 0.3

Don't Know.................................................. 7.0 3.7 2.7 0.3 0.4 Q 0.2

Unit is More Than 4 Years Old.................... 14.6 8.4 6.4 0.6 0.4 Q 0.8

Use a Swamp Cooler (Asked Only in Arid Areas)

Yes................................................................. 3.4 2.6 1.7 Q Q N 0.7

No................................................................... 41.9 29.1 24.5 1.1 Q 0.8 2.6

Not Asked....................................................... 65.8 46.3 37.8 3.0 1.7 1.5 2.4

 1. In the 2005 RECS 1.5 million housing units reported having both central and window/wall air conditioners.

 2. The number of housing units using air-conditioning includes a small, undetermined number of housing units where the fuel for central 

air-conditioning was some fuel other than electricity; these housing units were treated as if the air-condtioning fuel was electricity.

 Q = Data withheld either because the Relative Standard Error (RSE) was greater than 50 percent or fewer than 10 households were 

sampled.

 N = No cases in reporting sample.

 Notes: ● Because of rounding, data may not sum to totals. ● See Glossary for definition of terms used in these tables.

 Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 2005 

Residential Energy Consumption Survey.

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Total.................................................................. 111.1 33.0 8.0 3.4 5.9 14.4 1.2

Do Not Have Cooling Equipment..................... 17.8 6.5 1.6 0.9 1.3 2.4 0.2

Have Cooling Equipment................................. 93.3 26.5 6.5 2.5 4.6 12.0 1.0

Use Cooling Equipment.................................. 91.4 25.7 6.3 2.5 4.4 11.7 0.8

Have Equipment But Do Not Use it................. 1.9 0.8 Q Q 0.2 0.3 Q

Type of Air-Conditioning Equipment1, 2

Central System.............................................. 65.9 14.1 3.6 1.5 2.1 6.4 0.6

Without a Heat Pump.................................. 53.5 12.4 3.1 1.3 1.8 5.7 0.6

With a Heat Pump....................................... 12.3 1.7 0.6 Q 0.3 0.6 Q

Window/Wall Units....................................... 28.9 12.4 2.9 1.0 2.5 5.6 0.4

1 Unit.......................................................... 14.5 7.3 1.2 0.5 1.4 3.9 0.2

2 Units......................................................... 9.1 3.6 0.9 0.4 0.9 1.3 Q

3 or More Units............................................ 5.4 1.6 0.8 Q 0.3 0.3 Q

Central Air-Conditioning Usage

Air-Conditioned Floorspace (Square Feet)

None........................................................... 45.2 18.9 4.4 1.9 3.8 8.1 0.6

1 to 499....................................................... 3.9 1.5 0.3 Q 0.3 0.6 Q

500 to 999................................................... 15.0 6.7 0.7 0.5 1.3 3.8 0.4

1,000 to 1,499............................................. 15.6 4.0 1.3 0.5 0.5 1.7 Q

1,500 to 1,999............................................. 11.1 1.0 0.5 QQQQ

2,000 to 2,499............................................. 7.0 0.4 0.3 Q N N N

2,500 to 2,999............................................. 5.2 0.4 0.3 Q N Q N

3,000 or 3,499............................................. 2.7 Q Q NNNN

3,500 to 3,999............................................. 1.8 NNNNNN

4,000 or More.............................................. 3.5 Q Q NNNN

Number of Rooms Cooled by Central

Air-Conditioning in Summer 2005

None........................................................... 1.4 0.5 QQQQQ

1.................................................................. 0.7 0.5 Q N Q 0.4 N

2.................................................................. 2.1 0.9 Q Q Q 0.5 Q

3.................................................................. 7.5 2.8 Q 0.3 0.5 1.8 Q

4.................................................................. 7.9 3.4 0.3 0.5 0.5 2.0 Q

5 or More..................................................... 46.3 5.9 2.8 0.6 0.9 1.5 Q

Proportion of Rooms Air-Conditioned

None........................................................... 1.4 0.5 QQQQQ

Some, But Not all of the Rooms.................. 8.4 1.2 0.5 Q Q 0.4 Q

All of the Rooms.......................................... 56.1 12.4 3.0 1.3 1.9 5.8 0.4

Frequency of Central Air-Conditioner Use

Never.......................................................... 1.4 0.5 QQQQQ

Only a Few Times When Needed................ 11.4 2.5 0.4 0.3 0.4 1.3 Q

Quite a Bit................................................... 12.6 2.9 0.5 0.4 0.3 1.6 Q

All Summer................................................. 40.5 8.1 2.6 0.7 1.2 3.3 0.3

5 or More 

Units

Mobile 

Homes

 Million U.S. Housing Units

Table HC4.7 Air-Conditioning Usage Indicators by Renter-Occupied Housing Unit, 2005

 RenterOccupied 

Housing 

Units 

(millions)

Type of Renter-Occupied Housing Unit

U.S.

Housing 

Units 

(millions

Single-Family Units Apartments in 

Buildings With--

Air Conditioning Usage Indicators Detached Attached 2 to 4 

Units

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
5 or More 

Units

Mobile 

Homes

 Million U.S. Housing Units

Table HC4.7 Air-Conditioning Usage Indicators by Renter-Occupied Housing Unit, 2005

 RenterOccupied 

Housing 

Units 

(millions)

Type of Renter-Occupied Housing Unit

U.S.

Housing 

Units 

(millions

Single-Family Units Apartments in 

Buildings With--

Air Conditioning Usage Indicators Detached Attached 2 to 4 

Units

At Home Behavior

Home Used for Business

Yes.......................................................... 6.4 0.7 Q N Q 0.3 N

No........................................................... 59.5 13.4 3.3 1.5 2.0 6.1 0.6

Someone Home All Day

Yes.......................................................... 32.7 5.8 1.7 0.6 1.0 2.2 0.2

No........................................................... 33.1 8.4 1.9 0.9 1.0 4.2 0.3

Housing Unit Characteristics Affecting Usage

Large Tree(s) that Shade the Home

Yes............................................................. 31.6 4.7 1.8 0.6 0.5 1.7 Q

No............................................................... 34.3 9.4 1.8 0.9 1.6 4.7 0.3

Adequacy of Insulation

Well Insulated............................................. 29.5 5.3 1.2 0.4 0.8 2.7 Q

Adequately Insulated................................... 27.9 5.7 1.4 0.7 0.7 2.6 Q

Poorly Insulated.......................................... 7.3 2.4 0.8 0.3 0.3 0.7 0.3

No Insulation............................................... 0.3 Q Q N Q Q N

Don't Know.................................................. 0.9 0.7 QQQQN

Home Is Too Drafty During the Winter

Never.......................................................... 42.6 7.6 1.9 0.8 1.1 3.7 Q

Some of the Time........................................ 16.3 3.6 1.0 0.4 0.6 1.4 Q

Most of the Time......................................... 2.5 0.8 0.3 Q Q 0.3 Q

All of the Time............................................. 2.2 0.9 0.2 Q Q 0.4 Q

Don't Know.................................................. 2.2 1.2 Q Q Q 0.6 Q

Unusually High Ceilings

Yes............................................................. 20.3 1.8 0.8 0.2 0.3 0.5 N

No............................................................... 41.9 11.7 2.8 1.3 1.8 5.8 N

Not Asked (Mobile Homes)......................... 3.7 0.6 N N N N 0.6

Cathederal Ceilings

(In Housing Units with High Ceilings)

Yes...................................................... 13.5 1.0 0.4 Q Q 0.4 N

No........................................................ 6.7 0.8 0.4 Q Q Q N

Type of Glass in Windows

Single-pane Glass....................................... 27.4 9.2 2.5 1.0 1.5 3.9 0.4

Double-pane Glass

Without Low-e Coating............................ 31.5 4.6 1.0 0.5 0.6 2.3 Q

With Low-e Coating................................. 5.8 Q Q N N Q N

Triple-pane Glass

Without Low-e Coating............................ 0.8 Q Q N N Q N

With Low-e Coating................................. Q NNNNNN

Proportion of Windows Replaced

All................................................................ 11.5 1.8 0.6 0.3 Q 0.5 N

Some.......................................................... 11.1 0.9 0.3 Q Q 0.3 Q

None........................................................... 40.9 9.6 2.5 0.8 1.2 4.7 0.4

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
5 or More 

Units

Mobile 

Homes

 Million U.S. Housing Units

Table HC4.7 Air-Conditioning Usage Indicators by Renter-Occupied Housing Unit, 2005

 RenterOccupied 

Housing 

Units 

(millions)

Type of Renter-Occupied Housing Unit

U.S.

Housing 

Units 

(millions

Single-Family Units Apartments in 

Buildings With--

Air Conditioning Usage Indicators Detached Attached 2 to 4 

Units

Thermostats

Thermostat Available During Summer

Yes............................................................. 63.9 13.5 3.5 1.4 2.0 6.1 0.5

No............................................................... 1.9 0.6 Q Q Q 0.3 Q

Do Not Use Central Air-Conditioning........... 45.2 18.9 4.4 1.9 3.8 8.1 0.6

Use a Programmable Thermostat

Yes...................................................... 25.0 3.3 1.1 0.2 0.6 1.1 Q

No........................................................ 38.9 10.2 2.3 1.2 1.4 4.9 0.4

Use of Programmable Thermostats

Adjusts Temperature During Day

Yes.......................................................... 15.1 1.8 0.6 Q 0.4 0.6 Q

No........................................................... 9.9 1.5 0.5 Q Q 0.5 Q

Adjusts Temperature at Night

Yes.......................................................... 15.4 1.8 0.6 Q 0.4 0.6 Q

No........................................................... 9.6 1.5 0.6 Q Q 0.5 Q

Do Not Use Central Air-Conditioning........... 45.2 18.9 4.4 1.9 3.8 8.1 0.6

Summer 2005 Temperature Settings

Higher Temperature Settings

Daytime When No One is Home

Yes.......................................................... 0.5 Q Q Q N Q N

No........................................................... 50.8 10.2 3.0 1.0 1.4 4.4 0.4

Unknown................................................. 14.5 3.7 0.6 0.4 0.7 1.8 Q

Do Not Use Central Air-Conditioning....... 45.2 18.9 4.4 1.9 3.8 8.1 0.6

At Night During Sleeping Hours

Yes.......................................................... 7.3 0.6 Q Q Q 0.3 N

No........................................................... 44.3 9.9 2.9 1.0 1.4 4.3 0.4

Unknown................................................. 14.2 3.6 0.5 0.4 0.7 1.7 Q

Do Not Use Central Air-Conditioning........... 45.2 18.9 4.4 1.9 3.8 8.1 0.6

Daytime Setting When Someone is Home

Air Conditioner Turned On........................... 52.0 10.6 3.1 1.1 1.4 4.6 0.4

69 Degrees or Less................................. 4.8 1.6 0.3 Q Q 0.8 Q

70 Degrees.............................................. 7.2 2.0 0.4 0.2 0.3 1.1 N

71 to 73 Degrees..................................... 8.8 1.7 0.6 0.3 Q 0.5 Q

74 to 76 Degrees..................................... 16.5 3.5 1.2 0.3 0.5 1.3 Q

77 to 79 Degrees..................................... 11.1 1.3 0.4 Q Q 0.6 N

80 Degrees or More................................. 3.7 0.5 Q Q Q 0.3 N

Dont Know/No Answer............................. 1.1 0.4 QQQQQ

Do Not Use Central Air Conditioning........... 45.2 18.9 4.4 1.9 3.8 8.1 0.6

Setting When No On is at Home

Air Conditioner Turned On........................... 49.5 9.8 2.9 1.0 1.3 4.2 0.4

69 Degrees or Less................................. 3.6 1.1 0.3 Q Q 0.5 Q

70 Degrees.............................................. 5.2 1.6 0.3 0.2 Q 0.9 N

71 to 73 Degrees..................................... 6.0 1.3 0.5 Q Q 0.4 Q

74 to 76 Degrees..................................... 13.8 3.0 0.9 0.3 0.4 1.2 Q

77 to 79 Degrees..................................... 10.7 1.5 0.6 Q Q 0.7 N

80 Degrees or More................................. 10.2 1.3 0.4 Q Q 0.6 N

Dont Know/No Answer............................. 1.6 0.6 QQQQQ

Air-Conditioner Turned Off.......................... 2.0 0.6 Q Q Q 0.4 Q

Do Not Use Central Air Conditioning........... 45.2 18.9 4.4 1.9 3.8 8.1 0.6

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
5 or More 

Units

Mobile 

Homes

 Million U.S. Housing Units

Table HC4.7 Air-Conditioning Usage Indicators by Renter-Occupied Housing Unit, 2005

 RenterOccupied 

Housing 

Units 

(millions)

Type of Renter-Occupied Housing Unit

U.S.

Housing 

Units 

(millions

Single-Family Units Apartments in 

Buildings With--

Air Conditioning Usage Indicators Detached Attached 2 to 4 

Units

Setting During Seeping Hours

Air Conditioner Turned On 51.0 10.4 3.0 1.0 1.3 4.6 0.4

69 Degrees or Less................................. 5.7 1.5 0.3 Q Q 0.7 Q

70 Degrees.............................................. 7.7 2.0 0.4 0.2 Q 1.1 N

71 to 73 Degrees..................................... 8.3 1.6 0.6 0.3 0.3 0.4 Q

74 to 76 Degrees..................................... 15.5 3.3 1.0 0.2 0.5 1.3 Q

77 to 79 Degrees..................................... 9.7 1.3 0.4 Q Q 0.7 N

80 Degrees or More................................. 4.1 0.6 Q Q N 0.3 Q

Dont Know/No Answer............................. 1.3 0.4 QQQQQ

Air-Conditioner Turned Off.......................... 0.8 0.2 QQQQN

Do Not Use Central Air Conditioning........... 45.2 18.9 4.4 1.9 3.8 8.1 0.6

Dehumidifier Use Each Year

Use a Humidifier............................................. 13.3 1.2 0.6 Q Q 0.3 Q

1 to 3 Months Each Year............................. 5.1 0.6 0.2 Q Q Q N

4 to 6 Months Each Year............................. 4.4 0.3 Q N Q Q Q

7 to 9 Months Each Year............................. 0.9 Q Q NNNN

10 to 11 Months.......................................... Q NNNNNN

Turned on All Year Long............................. 2.6 0.3 Q Q N Q N

Do Not Use a Dehumidifier............................. 97.8 31.8 7.4 3.3 5.8 14.2 1.2

Window/Wall Air Conditioners

Frequency Most Used Unit Was Used

Never.......................................................... 0.6 0.3 Q N Q Q Q

Only a Few Times When Needed................ 12.1 4.9 1.2 0.3 0.9 2.4 Q

Quite a Bit................................................... 7.5 3.0 0.7 0.2 0.6 1.3 Q

All Summer................................................. 8.6 4.3 1.0 0.5 0.9 1.8 Q

Energy Star Wall/Window (Most-Used) Unit

Yes............................................................. 4.6 1.7 0.4 Q 0.4 0.6 Q

No............................................................... 2.7 1.3 0.3 Q 0.4 0.5 Q

Don't Know.................................................. 7.0 3.3 0.6 0.2 0.9 1.5 Q

Unit is More Than 4 Years Old.................... 14.6 6.2 1.5 0.5 0.9 3.1 0.2

Use a Swamp Cooler (Asked Only in Arid Areas)

Yes................................................................. 3.4 0.7 0.3 QQQQ

No................................................................... 41.9 12.7 3.7 1.1 2.2 5.2 0.6

Not Asked....................................................... 65.8 19.5 4.1 2.3 3.6 9.1 0.5

 1. In the 2005 RECS 1.5 million housing units reported having both central and window/wall air conditioners.

 2. The number of housing units using air-conditioning includes a small, undetermined number of housing units where the fuel for central 

air-conditioning was some fuel other than electricity; these housing units were treated as if the air-condtioning fuel was electricity.

 Q = Data withheld either because the Relative Standard Error (RSE) was greater than 50 percent or fewer than 10 households were 

sampled.

 N = No cases in reporting sample.

 Notes: ● Because of rounding, data may not sum to totals. ● See Glossary for definition of terms used in these tables.

 Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 2005 

Residential Energy Consumption Survey.

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Total.................................................................. 111.1 14.7 7.4 12.5 12.5 18.9 18.6 17.3 9.2

Do Not Have Cooling Equipment..................... 17.8 3.9 1.8 2.2 2.1 3.1 2.6 1.7 0.4

Have Cooling Equipment................................. 93.3 10.8 5.6 10.3 10.4 15.8 16.0 15.6 8.8

Use Cooling Equipment.................................. 91.4 10.6 5.5 10.3 10.3 15.3 15.7 15.3 8.6

Have Equipment But Do Not Use it................. 1.9 Q Q Q Q 0.6 0.4 0.3 Q

Type of Air-Conditioning Equipment1, 2

Central System.............................................. 65.9 3.7 2.6 6.1 6.8 11.2 13.2 13.9 8.2

Without a Heat Pump.................................. 53.5 3.6 2.3 5.5 5.8 9.5 10.1 10.3 6.4

With a Heat Pump....................................... 12.3 Q 0.3 0.6 1.0 1.7 3.1 3.6 1.7

Window/Wall Units....................................... 28.9 7.3 3.2 4.5 3.7 4.8 3.0 1.9 0.7

1 Unit.......................................................... 14.5 3.1 1.6 1.9 1.8 2.7 1.8 1.0 0.5

2 Units......................................................... 9.1 2.3 1.0 1.8 1.2 1.5 0.7 0.5 Q

3 or More Units............................................ 5.4 1.9 0.5 0.8 0.7 0.6 0.4 0.4 Q

Central Air-Conditioning Usage

Air-Conditioned Floorspace (Square Feet)

None........................................................... 45.2 10.9 4.8 6.4 5.7 7.7 5.3 3.4 1.1

1 to 499....................................................... 3.9 Q Q 0.4 0.3 1.0 1.0 0.6 0.4

500 to 999................................................... 15.0 1.0 0.6 1.2 1.5 2.6 4.1 2.9 1.1

1,000 to 1,499............................................. 15.6 0.9 0.8 1.8 1.7 2.7 2.5 3.5 1.7

1,500 to 1,999............................................. 11.1 0.5 0.6 1.2 1.2 2.3 1.9 2.0 1.4

2,000 to 2,499............................................. 7.0 0.3 Q 0.8 0.8 1.1 1.4 1.4 1.1

2,500 to 2,999............................................. 5.2 0.3 Q 0.4 0.7 0.5 1.0 1.3 0.8

3,000 or 3,499............................................. 2.7 0.3 Q Q Q 0.5 0.4 0.6 0.4

3,500 to 3,999............................................. 1.8 Q Q Q Q Q 0.3 0.6 0.4

4,000 or More.............................................. 3.5 0.3 Q Q Q 0.3 0.6 1.1 0.8

Number of Rooms Cooled by Central

Air-Conditioning in Summer 2005

None........................................................... 1.4 Q Q Q Q 0.4 0.3 Q Q

1.................................................................. 0.7 N N QQQQQQ

2.................................................................. 2.1 Q Q Q Q 0.4 0.6 0.4 Q

3.................................................................. 7.5 0.5 0.3 0.6 0.6 1.5 2.1 1.3 0.6

4.................................................................. 7.9 0.5 0.3 0.5 0.7 1.5 1.6 2.1 0.6

5 or More..................................................... 46.3 2.5 1.9 4.7 5.1 7.4 8.7 9.8 6.3

Proportion of Rooms Air-Conditioned

None........................................................... 1.4 Q Q Q Q 0.4 0.3 Q Q

Some, But Not all of the Rooms.................. 8.4 0.9 0.5 0.7 0.7 1.4 1.6 1.7 0.8

All of the Rooms.......................................... 56.1 2.8 2.1 5.3 6.0 9.5 11.3 12.0 7.2

Frequency of Central Air-Conditioner Use

Never.......................................................... 1.4 Q Q Q Q 0.4 0.3 Q Q

Only a Few Times When Needed................ 11.4 0.9 0.7 1.3 1.1 2.1 2.3 2.1 0.9

Quite a Bit................................................... 12.6 1.0 0.5 1.2 1.6 1.9 2.6 2.5 1.4

All Summer................................................. 40.5 1.7 1.4 3.5 4.1 6.8 8.1 9.2 5.7

2000 to 

Air Conditioning Usage Indicators 2005

Table HC5.7 Air-Conditioning Usage Indicators by Year of Construction, 2005

Year of Construction

Housing 

Units 

(millions)

Before 

1940

1940 to 

1949

1950 to 

1959

1960 to 

1969

1970 to 

1979

1980 to 

1989

1990 to 

1999

 Million U.S. Housing Units

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
2000 to 

Air Conditioning Usage Indicators 2005

Table HC5.7 Air-Conditioning Usage Indicators by Year of Construction, 2005

Year of Construction

Housing 

Units 

(millions)

Before 

1940

1940 to 

1949

1950 to 

1959

1960 to 

1969

1970 to 

1979

1980 to 

1989

1990 to 

1999

 Million U.S. Housing Units

At Home Behavior

Home Used for Business

Yes.......................................................... 6.4 0.4 Q Q 0.6 1.2 1.1 1.8 1.0

No........................................................... 59.5 3.3 2.5 5.9 6.2 10.1 12.2 12.1 7.2

Someone Home All Day

Yes.......................................................... 32.7 1.9 1.5 3.5 3.3 5.8 5.8 6.8 4.1

No........................................................... 33.1 1.8 1.2 2.6 3.5 5.4 7.5 7.2 4.0

Housing Unit Characteristics Affecting Usage

Large Tree(s) that Shade the Home

Yes............................................................. 31.6 2.6 1.8 3.9 3.9 5.9 6.3 5.7 1.5

No............................................................... 34.3 1.2 0.9 2.2 2.9 5.4 7.0 8.2 6.6

Adequacy of Insulation

Well Insulated............................................. 29.5 1.5 0.9 2.3 2.7 4.1 5.8 7.2 5.1

Adequately Insulated................................... 27.9 1.6 1.4 2.8 2.9 5.3 5.8 5.5 2.6

Poorly Insulated.......................................... 7.3 0.6 0.4 0.9 1.1 1.6 1.3 1.0 0.4

No Insulation............................................... 0.3 Q N Q N QQQQ

Don't Know.................................................. 0.9 Q N QQQQQQ

Home Is Too Drafty During the Winter

Never.......................................................... 42.6 1.9 1.5 3.9 4.1 6.9 8.4 9.8 6.0

Some of the Time........................................ 16.3 1.3 0.8 1.5 1.8 3.2 3.5 2.9 1.3

Most of the Time......................................... 2.5 Q Q 0.3 0.3 0.5 0.5 0.3 0.3

All of the Time............................................. 2.2 Q Q Q 0.4 0.4 0.3 0.4 Q

Don't Know.................................................. 2.2 Q Q Q Q 0.3 0.5 0.5 0.4

Unusually High Ceilings

Yes............................................................. 20.3 1.2 0.4 0.6 0.7 1.9 4.6 6.6 4.2

No............................................................... 41.9 2.5 2.2 5.5 6.0 8.5 7.7 5.9 3.5

Not Asked (Mobile Homes)......................... 3.7 N N N Q 0.9 1.0 1.4 0.4

Cathederal Ceilings

(In Housing Units with High Ceilings)

Yes...................................................... 13.5 0.3 Q Q 0.5 1.3 3.3 4.7 3.0

No........................................................ 6.7 0.9 Q 0.4 0.2 0.6 1.3 1.9 1.2

Type of Glass in Windows

Single-pane Glass....................................... 27.4 1.8 1.0 3.3 3.9 5.7 5.8 3.9 1.9

Double-pane Glass

Without Low-e Coating............................ 31.5 1.4 1.4 2.2 2.3 4.3 6.4 8.8 4.7

With Low-e Coating................................. 5.8 0.5 0.3 0.4 0.5 1.1 0.7 1.1 1.4

Triple-pane Glass

Without Low-e Coating............................ 0.8 QQQQQQQQ

With Low-e Coating................................. Q N N Q Q N N Q Q

Proportion of Windows Replaced

All................................................................ 11.5 1.2 1.2 2.0 2.1 2.6 1.6 0.5 0.4

Some.......................................................... 11.1 1.4 0.6 1.7 1.4 2.0 2.3 1.3 Q

None........................................................... 40.9 1.0 0.8 2.3 3.1 5.8 8.7 11.7 7.4

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
2000 to 

Air Conditioning Usage Indicators 2005

Table HC5.7 Air-Conditioning Usage Indicators by Year of Construction, 2005

Year of Construction

Housing 

Units 

(millions)

Before 

1940

1940 to 

1949

1950 to 

1959

1960 to 

1969

1970 to 

1979

1980 to 

1989

1990 to 

1999

 Million U.S. Housing Units

Thermostats

Thermostat Available During Summer

Yes............................................................. 63.9 3.6 2.5 5.9 6.5 11.0 12.7 13.5 8.1

No............................................................... 1.9 Q Q Q 0.3 0.2 0.5 0.4 Q

Do Not Use Central Air-Conditioning........... 45.2 10.9 4.8 6.4 5.7 7.7 5.3 3.4 1.1

Use a Programmable Thermostat

Yes...................................................... 25.0 1.5 1.2 2.2 2.3 4.0 4.9 4.9 4.0

No........................................................ 38.9 2.1 1.4 3.6 4.2 7.0 7.8 8.7 4.1

Use of Programmable Thermostats

Adjusts Temperature During Day

Yes.......................................................... 15.1 1.0 0.7 1.5 1.2 2.4 3.2 2.9 2.3

No........................................................... 9.9 0.5 0.4 0.7 1.1 1.6 1.8 2.0 1.7

Adjusts Temperature at Night

Yes.......................................................... 15.4 0.9 0.7 1.4 1.2 2.5 3.2 2.9 2.4

No........................................................... 9.6 0.6 0.4 0.8 1.1 1.4 1.7 1.9 1.6

Do Not Use Central Air-Conditioning........... 45.2 10.9 4.8 6.4 5.7 7.7 5.3 3.4 1.1

Summer 2005 Temperature Settings

Higher Temperature Settings

Daytime When No One is Home

Yes.......................................................... 0.5 QQQQQQQQ

No........................................................... 50.8 2.6 1.8 4.5 5.4 8.3 10.2 11.4 6.7

Unknown................................................. 14.5 1.1 0.8 1.6 1.4 2.8 2.9 2.5 1.3

Do Not Use Central Air-Conditioning....... 45.2 10.9 4.8 6.4 5.7 7.7 5.3 3.4 1.1

At Night During Sleeping Hours

Yes.......................................................... 7.3 0.3 Q 0.6 0.5 1.2 1.4 1.7 1.4

No........................................................... 44.3 2.3 1.7 3.9 5.0 7.2 8.9 9.8 5.5

Unknown................................................. 14.2 1.1 0.8 1.5 1.3 2.8 2.9 2.5 1.3

Do Not Use Central Air-Conditioning........... 45.2 10.9 4.8 6.4 5.7 7.7 5.3 3.4 1.1

Daytime Setting When Someone is Home

Air Conditioner Turned On........................... 52.0 2.6 1.8 4.6 5.5 8.5 10.4 11.5 6.9

69 Degrees or Less................................. 4.8 0.3 0.3 0.4 0.6 0.8 1.1 0.9 0.4

70 Degrees.............................................. 7.2 0.3 Q 0.7 0.7 1.2 1.5 1.4 1.2

71 to 73 Degrees..................................... 8.8 0.5 0.5 0.5 0.9 1.3 2.0 2.0 1.1

74 to 76 Degrees..................................... 16.5 1.0 0.5 1.5 1.7 3.1 3.0 3.6 2.1

77 to 79 Degrees..................................... 11.1 0.3 Q 1.1 1.2 1.8 2.0 2.5 1.8

80 Degrees or More................................. 3.7 Q Q 0.4 0.3 0.4 0.9 1.1 0.3

Dont Know/No Answer............................. 1.1 Q Q Q Q Q 0.3 Q Q

Do Not Use Central Air Conditioning........... 45.2 10.9 4.8 6.4 5.7 7.7 5.3 3.4 1.1

Daytime Setting When No On is at Home

Air Conditioner Turned On........................... 49.5 2.5 1.7 4.4 5.0 8.0 10.0 11.2 6.6

69 Degrees or Less................................. 3.6 0.3 Q 0.3 0.4 0.6 0.8 0.7 0.3

70 Degrees.............................................. 5.2 Q Q 0.5 0.6 0.8 1.0 1.1 0.8

71 to 73 Degrees..................................... 6.0 0.3 Q 0.6 0.6 0.7 1.2 1.4 1.0

74 to 76 Degrees..................................... 13.8 0.7 0.6 1.1 1.5 2.5 2.6 3.0 1.6

77 to 79 Degrees..................................... 10.7 0.5 Q 1.1 1.0 1.9 2.0 2.5 1.7

80 Degrees or More................................. 10.2 0.6 0.4 0.8 0.9 1.4 2.4 2.4 1.2

Dont Know/No Answer............................. 1.6 Q Q Q Q 0.3 0.4 0.2 Q

Air-Conditioner Turned Off.......................... 2.0 Q Q Q 0.4 0.5 0.4 Q 0.3

Do Not Use Central Air Conditioning........... 45.2 10.9 4.8 6.4 5.7 7.7 5.3 3.4 1.1

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
2000 to 

Air Conditioning Usage Indicators 2005

Table HC5.7 Air-Conditioning Usage Indicators by Year of Construction, 2005

Year of Construction

Housing 

Units 

(millions)

Before 

1940

1940 to 

1949

1950 to 

1959

1960 to 

1969

1970 to 

1979

1980 to 

1989

1990 to 

1999

 Million U.S. Housing Units

Setting During Seeping Hours

Air Conditioner Turned On 51.0 2.6 1.8 4.5 5.5 8.3 10.2 11.4 6.8

69 Degrees or Less................................. 5.7 0.3 Q 0.5 0.7 0.9 1.2 1.3 0.7

70 Degrees.............................................. 7.7 0.5 Q 0.7 0.8 1.2 1.5 1.6 1.2

71 to 73 Degrees..................................... 8.3 0.4 0.3 0.6 0.9 1.3 1.6 1.9 1.3

74 to 76 Degrees..................................... 15.5 0.8 0.7 1.3 1.7 2.9 3.3 3.2 1.6

77 to 79 Degrees..................................... 9.7 0.3 Q 1.0 1.0 1.5 1.6 2.4 1.7

80 Degrees or More................................. 4.1 Q Q 0.4 0.4 0.4 1.0 1.1 Q

Dont Know/No Answer............................. 1.3 Q Q Q Q 0.3 0.4 Q Q

Air-Conditioner Turned Off.......................... 0.8 QQQQQQQQ

Do Not Use Central Air Conditioning........... 45.2 10.9 4.8 6.4 5.7 7.7 5.3 3.4 1.1

Dehumidifier Use Each Year

Use a Humidifier............................................. 13.3 2.1 1.2 2.1 1.8 1.7 1.9 1.7 0.9

1 to 3 Months Each Year............................. 5.1 1.0 0.5 0.8 0.7 0.6 0.6 0.6 0.3

4 to 6 Months Each Year............................. 4.4 0.6 0.4 0.9 0.5 0.6 0.7 0.4 Q

7 to 9 Months Each Year............................. 0.9 QQQQQQQQ

10 to 11 Months.......................................... Q Q Q N Q N Q Q N

Turned on All Year Long............................. 2.6 0.3 Q 0.3 0.5 0.3 0.3 0.5 Q

Do Not Use a Dehumidifier............................. 97.8 12.6 6.2 10.4 10.7 17.2 16.7 15.7 8.3

Window/Wall Air Conditioners

Frequency Most Used Unit Was Used

Never.......................................................... 0.6 QQQQQQQQ

Only a Few Times When Needed................ 12.1 3.2 1.2 2.2 1.3 1.9 1.0 0.9 0.4

Quite a Bit................................................... 7.5 2.1 0.7 0.9 1.2 1.2 0.7 0.6 Q

All Summer................................................. 8.6 1.9 1.2 1.4 1.2 1.4 1.2 0.3 Q

Energy Star Wall/Window (Most-Used) Unit t

Yes............................................................. 4.6 1.1 0.6 0.6 0.6 0.7 0.4 0.4 Q

No............................................................... 2.7 0.8 0.2 0.3 0.3 0.3 0.5 Q Q

Don't Know.................................................. 7.0 1.8 0.9 1.1 0.7 1.3 0.7 0.3 0.3

Unit is More Than 4 Years Old.................... 14.6 3.6 1.4 2.4 2.1 2.5 1.4 1.0 0.2

Use a Swamp Cooler (Asked Only in Arid Areas)

Yes................................................................. 3.4 0.3 Q 0.4 0.3 1.0 0.9 0.3 Q

No................................................................... 41.9 3.2 2.8 3.8 4.4 7.7 8.6 7.4 3.9

Not Asked....................................................... 65.8 11.2 4.4 8.2 7.7 10.2 9.1 9.7 5.3

 1. In the 2005 RECS 1.5 million housing units reported having both central and window/wall air conditioners.

 2. The number of housing units using air-conditioning includes a small, undetermined number of housing units where the fuel for central airconditioning was some fuel other than electricity; these housing units were treated as if the air-condtioning fuel was electricity.

 Q = Data withheld either because the Relative Standard Error (RSE) was greater than 50 percent or fewer than 10 households were sampled.

 N = No cases in reporting sample.

 Notes: ● Because of rounding, data may not sum to totals. ● See Glossary for definition of terms used in these tables.

 Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 2005 

Residential Energy Consumption Survey.

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC6.7 Air-Conditioning Usage Indicators by Number of Household Members, 2005

Total........................................................................ 111.1 30.0 34.8 18.4 15.9 12.0

Do Not Have Cooling Equipment.......................... 17.8 5.4 5.3 2.7 2.5 2.0

Have Cooling Equipment...................................... 93.3 24.6 29.6 15.7 13.4 10.0

Use Cooling Equipment....................................... 91.4 24.0 29.1 15.5 13.2 9.7

Have Equipment But Do Not Use it...................... 1.9 0.6 0.5 Q 0.2 0.4

Type of Air-Conditioning Equipment1, 2

Central System................................................... 65.9 15.3 22.6 10.7 9.9 7.3

Without a Heat Pump....................................... 53.5 12.5 17.9 8.7 8.2 6.3

With a Heat Pump............................................ 12.3 2.7 4.8 2.0 1.8 1.0

Window/Wall Units............................................. 28.9 9.5 7.4 5.3 3.7 2.9

1 Unit................................................................ 14.5 6.5 3.7 2.0 1.3 1.0

2 Units.............................................................. 9.1 2.2 2.5 1.8 1.5 1.1

3 or More Units................................................. 5.4 0.9 1.2 1.5 1.0 0.8

Central Air-Conditioning Usage

Air-Conditioned Floorspace (Square Feet)

None................................................................ 45.2 14.8 12.2 7.7 5.9 4.7

1 to 499............................................................ 3.9 1.6 1.3 0.5 0.3 0.3

500 to 999........................................................ 15.0 5.6 5.0 2.2 1.4 0.9

1,000 to 1,499.................................................. 15.6 3.8 5.9 2.1 2.2 1.6

1,500 to 1,999.................................................. 11.1 2.0 3.5 2.1 2.0 1.5

2,000 to 2,499.................................................. 7.0 0.8 2.6 1.2 1.3 1.0

2,500 to 2,999.................................................. 5.2 0.7 1.8 1.0 0.8 0.9

3,000 or 3,499.................................................. 2.7 0.4 1.1 0.6 0.5 Q

3,500 to 3,999.................................................. 1.8 Q 0.4 0.3 0.6 0.3

4,000 or More................................................... 3.5 Q 1.1 0.8 0.7 0.6

Number of Rooms Cooled by Central

Air-Conditioning in Summer 2005

None................................................................ 1.4 0.4 0.3 Q Q 0.3

1....................................................................... 0.7 0.4 Q Q Q Q

2....................................................................... 2.1 0.8 0.9 0.3 Q Q

3....................................................................... 7.5 3.5 2.5 0.6 0.7 0.2

4....................................................................... 7.9 2.3 2.5 1.3 1.1 0.6

5 or More.......................................................... 46.3 8.0 16.2 8.2 7.9 6.0

Proportion of Rooms Air-Conditioned

None................................................................ 1.4 0.4 0.3 Q Q 0.3

Some, But Not all of the Rooms....................... 8.4 2.3 3.3 1.5 0.9 0.6

All of the Rooms............................................... 56.1 12.6 19.1 9.0 8.9 6.4

Frequency of Central Air-Conditioner Use

Never............................................................... 1.4 0.4 0.3 Q Q 0.3

Only a Few Times When Needed..................... 11.4 3.5 3.4 1.6 1.6 1.2

Quite a Bit........................................................ 12.6 2.9 4.5 2.0 2.0 1.2

All Summer...................................................... 40.5 8.5 14.4 6.9 6.2 4.5

Number of Households With --

Housing 

Units 

(millions)

1

 Member

2

 Members

3

 Members

4

 Members

5 or More 

Members

 Million U.S. Housing Units

Air-Conditioning Usage Indicators

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC6.7 Air-Conditioning Usage Indicators by Number of Household Members, 2005

Number of Households With --

Housing 

Units 

(millions)

1

 Member

2

 Members

3

 Members

4

 Members

5 or More 

Members

 Million U.S. Housing Units

Air-Conditioning Usage Indicators

At Home Behavior

Home Used for Business

Yes............................................................... 6.4 0.9 2.2 1.3 1.3 0.7

No................................................................. 59.5 14.4 20.4 9.5 8.6 6.5

Someone Home All Day

Yes............................................................... 32.7 6.3 11.9 5.0 4.9 4.6

No................................................................. 33.1 9.0 10.7 5.8 5.0 2.7

Housing Unit Characteristics Affecting Usage

Large Tree(s) that Shade the Home

Yes................................................................... 31.6 6.4 12.0 4.9 4.7 3.5

No.................................................................... 34.3 8.8 10.6 5.8 5.2 3.8

Adequacy of Insulation

Well Insulated.................................................. 29.5 6.8 10.6 4.7 4.2 3.1

Adequately Insulated........................................ 27.9 6.5 9.7 4.4 4.2 3.0

Poorly Insulated................................................ 7.3 1.6 2.1 1.4 1.4 0.9

No Insulation.................................................... 0.3 QQQQ Q

Don't Know....................................................... 0.9 0.4 Q Q Q Q

Home Is Too Drafty During the Winter

Never............................................................... 42.6 10.7 15.8 6.0 5.8 4.3

Some of the Time............................................. 16.3 3.1 5.0 3.3 2.8 2.0

Most of the Time.............................................. 2.5 0.5 0.5 0.7 0.6 0.3

All of the Time.................................................. 2.2 0.5 0.7 0.3 0.5 Q

Don't Know....................................................... 2.2 0.5 0.7 0.4 0.3 0.4

Unusually High Ceilings

Yes................................................................... 20.3 3.6 6.7 3.7 3.6 2.6

No.................................................................... 41.9 10.4 14.9 6.5 5.7 4.4

Not Asked (Mobile Homes)............................... 3.7 1.2 1.0 0.5 0.6 0.3

Cathederal Ceilings

(In Housing Units with High Ceilings)

Yes........................................................... 13.5 2.3 4.3 2.6 2.5 1.9

No............................................................. 6.7 1.4 2.4 1.1 1.1 0.7

Type of Glass in Windows

Single-pane Glass............................................ 27.4 7.7 8.7 4.3 3.9 2.9

Double-pane Glass

Without Low-e Coating................................. 31.5 6.6 10.8 5.1 5.3 3.7

With Low-e Coating...................................... 5.8 0.7 2.8 1.0 0.6 0.7

Triple-pane Glass

Without Low-e Coating................................. 0.8 Q 0.3 Q Q Q

With Low-e Coating...................................... Q N Q Q Q Q

Proportion of Windows Replaced

All..................................................................... 11.5 2.5 4.4 1.7 1.5 1.4

Some................................................................ 11.1 2.3 4.0 1.8 1.6 1.3

None................................................................ 40.9 9.6 13.5 6.9 6.4 4.4

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC6.7 Air-Conditioning Usage Indicators by Number of Household Members, 2005

Number of Households With --

Housing 

Units 

(millions)

1

 Member

2

 Members

3

 Members

4

 Members

5 or More 

Members

 Million U.S. Housing Units

Air-Conditioning Usage Indicators

Thermostats

Thermostat Available During Summer

Yes................................................................... 63.9 14.9 21.9 10.4 9.7 7.1

No.................................................................... 1.9 0.4 0.8 0.3 0.3 Q

Do Not Use Central Air-Conditioning................ 45.2 14.8 12.2 7.7 5.9 4.7

Use a Programmable Thermostat

Yes........................................................... 25.0 4.6 8.3 4.7 4.5 3.1

No............................................................. 38.9 10.3 13.6 5.8 5.2 4.0

Use of Programmable Thermostats

Adjusts Temperature During Day

Yes............................................................... 15.1 2.5 5.4 2.7 2.8 1.8

No................................................................. 9.9 2.0 2.9 2.0 1.7 1.3

Adjusts Temperature at Night

Yes............................................................... 15.4 2.3 5.5 2.7 3.0 1.9

No................................................................. 9.6 2.2 2.8 1.9 1.5 1.2

Do Not Use Central Air-Conditioning................ 45.2 14.8 12.2 7.7 5.9 4.7

Summer 2005 Temperature Settings

Higher Temperature Settings

Daytime When No One is Home

Yes............................................................... 0.5 QQQQ Q

No................................................................. 50.8 10.9 18.0 8.5 7.9 5.5

Unknown....................................................... 14.5 4.2 4.5 2.0 2.1 1.7

Do Not Use Central Air-Conditioning............. 45.2 14.8 12.2 7.7 5.9 4.7

At Night During Sleeping Hours

Yes............................................................... 7.3 1.4 3.0 1.3 1.2 0.4

No................................................................. 44.3 9.6 15.3 7.4 6.8 5.3

Unknown....................................................... 14.2 4.3 4.4 2.0 2.0 1.6

Do Not Use Central Air-Conditioning................ 45.2 14.8 12.2 7.7 5.9 4.7

Daytime Setting When Someone is Home

Air Conditioner Turned On................................ 52.0 11.1 18.4 8.8 8.0 5.7

69 Degrees or Less...................................... 4.8 0.7 1.6 0.9 1.0 0.6

70 Degrees................................................... 7.2 1.5 2.4 1.2 1.3 0.8

71 to 73 Degrees.......................................... 8.8 1.6 2.9 1.3 1.7 1.2

74 to 76 Degrees.......................................... 16.5 3.3 6.1 2.9 2.3 1.9

77 to 79 Degrees.......................................... 11.1 2.8 3.9 2.0 1.4 1.0

80 Degrees or More...................................... 3.7 1.2 1.5 0.4 0.4 Q

Dont Know/No Answer.................................. 1.1 0.3 0.5 Q Q Q

Do Not Use Central Air Conditioning................ 45.2 14.8 12.2 7.7 5.9 4.7

Daytime Setting When No On is at Home

Air Conditioner Turned On................................ 49.5 10.7 17.3 8.6 7.6 5.3

69 Degrees or Less...................................... 3.6 0.5 1.0 0.9 0.6 0.4

70 Degrees................................................... 5.2 0.9 1.9 0.9 0.9 0.5

71 to 73 Degrees.......................................... 6.0 1.0 2.0 0.8 1.2 1.0

74 to 76 Degrees.......................................... 13.8 2.9 5.0 2.3 1.9 1.6

77 to 79 Degrees.......................................... 10.7 2.8 3.5 1.8 1.6 1.0

80 Degrees or More...................................... 10.2 2.5 3.8 1.9 1.3 0.7

Dont Know/No Answer.................................. 1.6 0.3 0.7 Q 0.3 Q

Air-Conditioner Turned Off................................ 2.0 0.5 0.8 Q 0.3 0.2

Do Not Use Central Air Conditioning................ 45.2 14.8 12.2 7.7 5.9 4.7

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC6.7 Air-Conditioning Usage Indicators by Number of Household Members, 2005

Number of Households With --

Housing 

Units 

(millions)

1

 Member

2

 Members

3

 Members

4

 Members

5 or More 

Members

 Million U.S. Housing Units

Air-Conditioning Usage Indicators

Setting During Seeping Hours

Air Conditioner Turned On 51.0 10.9 17.9 8.7 7.8 5.6

69 Degrees or Less...................................... 5.7 1.0 2.0 1.3 0.9 0.6

70 Degrees................................................... 7.7 1.6 2.6 1.2 1.5 0.7

71 to 73 Degrees.......................................... 8.3 1.6 2.7 1.2 1.6 1.1

74 to 76 Degrees.......................................... 15.5 3.0 5.7 2.6 2.3 1.9

77 to 79 Degrees.......................................... 9.7 2.5 3.4 1.8 1.2 0.9

80 Degrees or More...................................... 4.1 1.3 1.5 0.5 0.4 0.4

Dont Know/No Answer.................................. 1.3 0.3 0.6 Q Q Q

Air-Conditioner Turned Off................................ 0.8 Q 0.4 Q Q Q

Do Not Use Central Air Conditioning................ 45.2 14.8 12.2 7.7 5.9 4.7

Dehumidifier Use Each Year

Use a Humidifier.................................................. 13.3 2.2 5.1 2.5 2.0 1.4

1 to 3 Months Each Year.................................. 5.1 0.8 2.0 0.9 0.8 0.6

4 to 6 Months Each Year.................................. 4.4 0.9 1.8 0.9 0.6 Q

7 to 9 Months Each Year.................................. 0.9 Q 0.3 Q Q Q

10 to 11 Months................................................ Q N Q Q Q Q

Turned on All Year Long................................... 2.6 0.3 0.9 0.6 0.4 0.4

Do Not Use a Dehumidifier.................................. 97.8 27.8 29.7 15.9 13.8 10.5

Window/Wall Air Conditioners

Frequency Most Used Unit Was Used

Never............................................................... 0.6 Q 0.2 Q Q Q

Only a Few Times When Needed..................... 12.1 4.6 3.1 1.7 1.5 1.1

Quite a Bit........................................................ 7.5 2.4 1.9 1.6 0.8 0.8

All Summer...................................................... 8.6 2.3 2.1 1.9 1.3 0.9

Energy Star Wall/Window (Most-Used) Unit

Yes................................................................... 4.6 1.3 1.2 0.9 0.7 0.4

No.................................................................... 2.7 0.8 0.7 0.4 0.3 0.5

Don't Know....................................................... 7.0 1.9 2.0 1.2 1.0 0.8

Unit is More Than 4 Years Old......................... 14.6 5.5 3.4 2.8 1.7 1.2

Use a Swamp Cooler (Asked Only in Arid Areas)

Yes...................................................................... 3.4 0.9 0.8 0.6 0.5 0.5

No........................................................................ 41.9 10.8 12.9 6.7 6.3 5.1

Not Asked............................................................ 65.8 18.3 21.1 11.1 9.0 6.3

 1. In the 2005 RECS 1.5 million housing units reported having both central and window/wall air conditioners.

 2. The number of housing units using air-conditioning includes a small, undetermined number of housing units where the fuel for central 

air-conditioning was some fuel other than electricity; these housing units were treated as if the air-condtioning fuel was electricity.

 Q = Data withheld either because the Relative Standard Error (RSE) was greater than 50 percent or fewer than 10 households were 

sampled.

 N = No cases in reporting sample.

 Notes: ● Because of rounding, data may not sum to totals. ● See Glossary for definition of terms used in these tables.

 Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 2005 

Residential Energy Consumption Survey.

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Total.............................................................. 111.1 26.7 28.8 20.6 13.1 22.0 16.6 38.6

Do Not Have Cooling Equipment................ 17.8 5.3 4.7 2.8 1.9 3.1 3.6 7.5

Have Cooling Equipment............................. 93.3 21.5 24.1 17.8 11.2 18.8 13.0 31.1

Use Cooling Equipment.............................. 91.4 21.0 23.5 17.4 11.0 18.6 12.6 30.3

Have Equipment But Do Not Use it............. 1.9 0.5 0.6 0.4 Q Q 0.5 0.8

Type of Air-Conditioning Equipment1, 2

Central System.......................................... 65.9 11.0 16.5 13.5 8.7 16.1 6.4 17.2

Without a Heat Pump.............................. 53.5 9.4 13.6 10.7 7.1 12.7 5.4 14.5

With a Heat Pump................................... 12.3 1.7 2.8 2.8 1.6 3.4 1.0 2.7

Window/Wall Units................................... 28.9 10.5 8.1 4.5 2.7 3.1 6.7 14.1

1 Unit...................................................... 14.5 5.8 4.3 2.0 1.1 1.3 3.4 7.4

2 Units.................................................... 9.1 3.2 2.4 1.5 0.9 1.1 2.3 4.4

3 or More Units....................................... 5.4 1.6 1.4 1.0 0.7 0.8 1.1 2.4

Central Air-Conditioning Usage

Air-Conditioned Floorspace (Square Feet)

None....................................................... 45.2 15.7 12.3 7.0 4.4 5.8 10.2 21.4

1 to 499................................................... 3.9 1.2 1.3 0.7 0.5 Q 1.0 1.5

500 to 999............................................... 15.0 4.5 4.4 2.8 1.5 1.9 2.5 5.8

1,000 to 1,499......................................... 15.6 3.0 4.5 4.1 1.8 2.2 1.8 4.6

1,500 to 1,999......................................... 11.1 1.3 3.1 2.3 1.6 2.9 0.6 2.6

2,000 to 2,499......................................... 7.0 0.5 1.3 1.5 1.3 2.4 0.2 1.2

2,500 to 2,999......................................... 5.2 Q 0.9 0.9 0.9 2.2 Q 0.6

3,000 or 3,499......................................... 2.7 Q 0.3 0.6 0.4 1.2 Q 0.3

3,500 to 3,999......................................... 1.8 Q 0.3 Q 0.3 1.0 Q 0.2

4,000 or More.......................................... 3.5 Q 0.3 0.5 0.4 2.2 Q 0.4

Number of Rooms Cooled by Central

Air-Conditioning in Summer 2005

None....................................................... 1.4 0.4 0.4 0.3 Q Q 0.5 0.6

1............................................................. 0.7 Q Q Q Q QQ Q

2............................................................. 2.1 0.5 0.8 0.5 Q Q 0.4 0.7

3............................................................. 7.5 2.2 1.7 1.4 0.9 1.3 1.3 2.5

4............................................................. 7.9 2.2 2.5 1.2 0.6 1.3 1.2 3.1

5 or More................................................ 46.3 5.5 11.0 9.9 6.8 13.2 2.9 10.1

Proportion of Rooms Air-Conditioned

None....................................................... 1.4 0.4 0.4 0.3 Q Q 0.5 0.6

Some, But Not all of the Rooms.............. 8.4 1.4 1.9 1.6 1.0 2.5 0.9 1.9

All of the Rooms..................................... 56.1 9.2 14.2 11.6 7.5 13.5 5.0 14.7

Frequency of Central Air-Conditioner Use

Never...................................................... 1.4 0.4 0.4 0.3 Q Q 0.5 0.6

Only a Few Times When Needed........... 11.4 2.4 2.9 2.0 1.5 2.6 1.2 3.6

Quite a Bit............................................... 12.6 1.8 3.4 2.3 2.0 3.1 1.1 3.1

All Summer............................................. 40.5 6.5 9.8 8.9 5.0 10.3 3.6 9.9

 Million U.S. Housing Units

Air-Conditioning Usage Indicators

Table HC7.7 Air-Conditioning Usage Indicators by Household Income, 2005

Below 

Poverty 

Line

Eligible for 

Federal 

Assistance1

2005 Household Income

Housing 

Units 

(millions)

Less than 

$20,000

$20,000 to 

$39,999

$40,000 to 

$59,999

$60,000 to 

$79,999

$80,000 or 

More

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
 Million U.S. Housing Units

Air-Conditioning Usage Indicators

Table HC7.7 Air-Conditioning Usage Indicators by Household Income, 2005

Below 

Poverty 

Line

Eligible for 

Federal 

Assistance1

2005 Household Income

Housing 

Units 

(millions)

Less than 

$20,000

$20,000 to 

$39,999

$40,000 to 

$59,999

$60,000 to 

$79,999

$80,000 or 

More

At Home Behavior

Home Used for Business

Yes...................................................... 6.4 0.5 1.0 1.3 0.9 2.7 0.3 1.0

No....................................................... 59.5 10.5 15.4 12.3 7.8 13.4 6.1 16.2

Someone Home All Day

Yes...................................................... 32.7 6.5 9.1 6.1 4.4 6.5 4.0 10.4

No....................................................... 33.1 4.5 7.4 7.4 4.3 9.6 2.4 6.8

Housing Unit Characteristics Affecting Usage

Large Tree(s) that Shade the Home

Yes......................................................... 31.6 4.8 7.8 6.8 4.2 8.0 2.8 7.7

No........................................................... 34.3 6.2 8.7 6.7 4.5 8.1 3.7 9.5

Adequacy of Insulation

Well Insulated......................................... 29.5 5.0 7.2 6.2 3.7 7.5 2.7 7.3

Adequately Insulated............................... 27.9 4.3 6.5 5.8 4.0 7.3 2.4 6.7

Poorly Insulated...................................... 7.3 1.4 2.3 1.4 0.9 1.3 1.0 2.5

No Insulation........................................... 0.3 Q Q Q Q QQ Q

Don't Know.............................................. 0.9 0.3 0.4 Q Q Q Q 0.5

Home Is Too Drafty During the Winter

Never...................................................... 42.6 7.4 10.7 8.8 5.2 10.6 4.1 11.0

Some of the Time................................... 16.3 2.4 3.7 3.5 2.5 4.2 1.4 3.9

Most of the Time..................................... 2.5 0.5 0.7 0.4 0.4 0.6 0.4 0.8

All of the Time......................................... 2.2 0.4 0.8 0.3 0.3 0.3 0.3 0.8

Don't Know.............................................. 2.2 0.3 0.6 0.5 0.3 0.5 0.3 0.7

Unusually High Ceilings

Yes......................................................... 20.3 1.2 3.2 3.8 3.5 8.6 0.7 2.4

No........................................................... 41.9 8.7 11.7 9.1 5.0 7.4 5.0 13.2

Not Asked (Mobile Homes)..................... 3.7 1.1 1.6 0.6 Q Q 0.7 1.7

Cathederal Ceilings

(In Housing Units with High Ceilings)

Yes.................................................. 13.5 0.7 2.0 2.3 2.3 6.3 0.4 1.4

No.................................................... 6.7 0.6 1.2 1.5 1.2 2.3 0.3 1.0

Type of Glass in Windows

Single-pane Glass................................... 27.4 6.2 8.0 5.7 2.8 4.6 3.8 9.1

Double-pane Glass

Without Low-e Coating........................ 31.5 4.5 7.1 6.6 4.5 8.8 2.4 7.4

With Low-e Coating............................. 5.8 Q 1.1 1.1 1.2 2.4 Q 0.5

Triple-pane Glass

Without Low-e Coating........................ 0.8 Q Q Q Q QQ Q

With Low-e Coating............................. Q N Q N N Q N Q

Proportion of Windows Replaced

All........................................................... 11.5 2.1 3.0 2.0 2.1 2.4 1.1 3.4

Some...................................................... 11.1 1.5 2.4 2.4 1.3 3.5 0.8 2.4

None....................................................... 40.9 6.8 10.4 8.7 5.1 9.9 4.2 10.5

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
 Million U.S. Housing Units

Air-Conditioning Usage Indicators

Table HC7.7 Air-Conditioning Usage Indicators by Household Income, 2005

Below 

Poverty 

Line

Eligible for 

Federal 

Assistance1

2005 Household Income

Housing 

Units 

(millions)

Less than 

$20,000

$20,000 to 

$39,999

$40,000 to 

$59,999

$60,000 to 

$79,999

$80,000 or 

More

Thermostats

Thermostat Available During Summer

Yes......................................................... 63.9 10.4 15.8 13.2 8.6 15.9 6.0 16.2

No........................................................... 1.9 0.6 0.6 0.4 Q Q 0.4 1.0

Do Not Use Central Air-Conditioning....... 45.2 15.7 12.3 7.0 4.4 5.8 10.2 21.4

Use a Programmable Thermostat

Yes.................................................. 25.0 2.6 4.8 5.1 4.0 8.5 1.5 4.4

No.................................................... 38.9 7.8 11.0 8.1 4.6 7.4 4.5 11.8

Use of Programmable Thermostats

Adjusts Temperature During Day

Yes...................................................... 15.1 1.2 3.0 3.0 2.6 5.3 0.7 2.4

No....................................................... 9.9 1.3 1.9 2.1 1.4 3.2 0.8 2.1

Adjusts Temperature at Night

Yes...................................................... 15.4 1.2 3.1 3.2 2.4 5.5 0.7 2.4

No....................................................... 9.6 1.4 1.7 1.9 1.6 3.0 0.8 2.0

Do Not Use Central Air-Conditioning....... 45.2 15.7 12.3 7.0 4.4 5.8 10.2 21.4

Summer 2005 Temperature Settings

Higher Temperature Settings

Daytime When No One is Home

Yes...................................................... 0.5 Q Q Q Q QQ Q

No....................................................... 50.8 7.7 12.5 10.8 6.7 13.1 4.3 12.2

Unknown............................................. 14.5 3.2 3.8 2.5 1.9 3.0 2.1 4.9

Do Not Use Central Air-Conditioning... 45.2 15.7 12.3 7.0 4.4 5.8 10.2 21.4

At Night During Sleeping Hours

Yes 7.3 0.7 1.8 1.5 0.8 2.5 0.3 1.2

No....................................................... 44.3 7.3 10.9 9.6 5.9 10.6 4.2 11.4

Unknown............................................. 14.2 3.1 3.8 2.5 1.9 3.0 1.9 4.7

Do Not Use Central Air-Conditioning....... 45.2 15.7 12.3 7.0 4.4 5.8 10.2 21.4

Daytime Setting When Someone is Home

Air Conditioner Turned On...................... 52.0 8.0 12.9 11.1 6.8 13.2 4.5 12.6

69 Degrees or Less............................. 4.8 0.9 1.2 1.0 0.5 1.1 0.7 1.5

70 Degrees.......................................... 7.2 1.2 2.2 1.2 1.0 1.6 0.8 2.4

71 to 73 Degrees................................. 8.8 0.9 1.8 1.8 1.1 3.1 0.5 1.5

74 to 76 Degrees................................. 16.5 2.5 3.8 3.7 2.3 4.2 1.4 3.8

77 to 79 Degrees................................. 11.1 2.0 2.6 2.6 1.4 2.4 1.0 2.7

80 Degrees or More............................. 3.7 0.4 1.2 0.7 0.5 0.9 Q 0.7

Dont Know/No Answer........................ 1.1 0.3 0.3 Q Q Q 0.3 0.4

Do Not Use Central Air Conditioning....... 45.2 15.7 12.3 7.0 4.4 5.8 10.2 21.4

Daytime Setting When No On is at Home

Air Conditioner Turned On...................... 49.5 7.5 12.2 10.6 6.4 12.7 4.1 11.9

69 Degrees or Less............................. 3.6 0.8 1.0 0.7 0.4 0.7 0.6 1.3

70 Degrees.......................................... 5.2 0.9 1.6 0.8 0.8 1.0 0.6 1.8

71 to 73 Degrees................................. 6.0 0.8 1.3 1.3 0.8 1.9 0.4 1.3

74 to 76 Degrees................................. 13.8 2.0 3.4 3.2 1.6 3.6 1.2 3.3

77 to 79 Degrees................................. 10.7 1.8 2.4 2.0 1.5 3.0 0.7 2.4

80 Degrees or More............................. 10.2 1.3 2.5 2.6 1.2 2.6 0.7 1.9

Dont Know/No Answer........................ 1.6 0.4 0.5 Q 0.3 Q 0.4 0.6

Air-Conditioner Turned Off...................... 2.0 0.3 0.5 0.4 0.3 0.4 0.3 0.6

Do Not Use Central Air Conditioning....... 45.2 15.7 12.3 7.0 4.4 5.8 10.2 21.4

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
 Million U.S. Housing Units

Air-Conditioning Usage Indicators

Table HC7.7 Air-Conditioning Usage Indicators by Household Income, 2005

Below 

Poverty 

Line

Eligible for 

Federal 

Assistance1

2005 Household Income

Housing 

Units 

(millions)

Less than 

$20,000

$20,000 to 

$39,999

$40,000 to 

$59,999

$60,000 to 

$79,999

$80,000 or 

More

Setting During Seeping Hours

Air Conditioner Turned On 51.0 8.0 12.6 10.8 6.6 13.0 4.4 12.6

69 Degrees or Less............................. 5.7 1.0 1.5 1.2 0.6 1.5 0.7 1.5

70 Degrees.......................................... 7.7 1.3 2.2 1.3 1.1 1.7 0.8 2.4

71 to 73 Degrees................................. 8.3 1.0 1.7 1.7 0.9 2.9 0.5 1.7

74 to 76 Degrees................................. 15.5 2.5 3.4 3.4 2.3 3.8 1.4 3.7

77 to 79 Degrees................................. 9.7 1.6 2.5 2.4 1.3 2.0 0.8 2.3

80 Degrees or More............................. 4.1 0.7 1.2 0.8 0.4 1.1 0.3 1.0

Dont Know/No Answer........................ 1.3 0.2 0.5 Q Q Q 0.2 0.4

Air-Conditioner Turned Off...................... 0.8 Q Q Q Q QQ Q

Do Not Use Central Air Conditioning....... 45.2 15.7 12.3 7.0 4.4 5.8 10.2 21.4

Dehumidifier Use Each Year

Use a Humidifier......................................... 13.3 1.6 2.9 2.4 2.1 4.3 0.7 3.0

1 to 3 Months Each Year......................... 5.1 0.9 1.3 0.9 0.8 1.4 0.3 1.5

4 to 6 Months Each Year......................... 4.4 0.4 0.9 0.9 0.7 1.5 Q 0.7

7 to 9 Months Each Year......................... 0.9 Q Q Q Q 0.4 Q Q

10 to 11 Months...................................... Q N Q N Q Q N Q

Turned on All Year Long......................... 2.6 0.2 0.5 0.5 0.4 1.0 Q 0.6

Do Not Use a Dehumidifier......................... 97.8 25.1 25.9 18.2 11.0 17.7 16.0 35.6

Window/Wall Air Conditioners

Frequency Most Used Unit Was Used

Never...................................................... 0.6 Q Q Q Q Q Q 0.2

Only a Few Times When Needed........... 12.1 4.2 3.2 1.9 1.4 1.4 2.5 5.8

Quite a Bit............................................... 7.5 2.4 2.4 1.2 0.8 0.8 1.4 3.3

All Summer............................................. 8.6 3.7 2.3 1.2 0.6 0.8 2.7 4.8

Energy Star Wall/Window (Most-Used) Unit

Yes......................................................... 4.6 1.3 1.2 0.9 0.7 0.5 0.8 1.9

No........................................................... 2.7 1.1 0.9 0.4 Q 0.2 0.7 1.6

Don't Know.............................................. 7.0 2.3 1.9 1.1 0.7 1.0 1.6 3.3

Unit is More Than 4 Years Old................ 14.6 5.8 4.1 2.1 1.2 1.4 3.6 7.4

Use a Swamp Cooler (Asked Only in Arid Areas)

Yes............................................................. 3.4 1.0 0.9 0.5 0.4 0.5 0.8 1.4

No............................................................... 41.9 9.2 10.8 8.5 4.7 8.7 6.3 13.3

Not Asked................................................... 65.8 16.5 17.0 11.5 8.0 12.8 9.6 23.9

 1. In the 2005 RECS 1.5 million housing units reported having both central and window/wall air conditioners.

 2. The number of housing units using air-conditioning includes a small, undetermined number of housing units where the fuel for central airconditioning was some fuel other than electricity; these housing units were treated as if the air-condtioning fuel was electricity.

 Q = Data withheld either because the Relative Standard Error (RSE) was greater than 50 percent or fewer than 10 households were sampled.

 N = No cases in reporting sample.

 Notes: ● Because of rounding, data may not sum to totals. ● See Glossary for definition of terms used in these tables.

 Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 2005 

Residential Energy Consumption Survey.

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Total............................................................................. 111.1 47.1 19.0 22.7 22.3

Do Not Have Cooling Equipment............................... 17.8 8.5 2.7 2.6 4.0

Have Cooling Equipment............................................ 93.3 38.6 16.2 20.1 18.4

Use Cooling Equipment............................................. 91.4 37.8 15.9 19.8 18.0

Have Equipment But Do Not Use it............................ 1.9 0.9 0.3 0.3 0.4

Type of Air-Conditioning Equipment1, 2

Central System........................................................ 65.9 25.8 10.9 16.6 12.5

Without a Heat Pump............................................. 53.5 21.2 9.7 13.7 8.9

With a Heat Pump................................................. 12.3 4.6 1.2 2.8 3.6

Window/Wall Units.................................................. 28.9 13.4 5.6 3.9 6.1

1 Unit..................................................................... 14.5 6.8 2.3 2.0 3.3

2 Units................................................................... 9.1 4.1 1.9 1.2 1.9

3 or More Units...................................................... 5.4 2.4 1.4 0.7 0.9

Central Air-Conditioning Usage

Air-Conditioned Floorspace (Square Feet)

None...................................................................... 45.2 21.3 8.0 6.1 9.8

1 to 499.................................................................. 3.9 2.1 0.8 0.6 0.5

500 to 999.............................................................. 15.0 7.5 2.6 3.0 2.0

1,000 to 1,499........................................................ 15.6 6.7 2.7 3.3 2.8

1,500 to 1,999........................................................ 11.1 4.5 1.9 2.3 2.4

2,000 to 2,499........................................................ 7.0 1.8 1.2 2.6 1.4

2,500 to 2,999........................................................ 5.2 1.6 0.6 2.0 1.0

3,000 or 3,499........................................................ 2.7 0.5 0.4 1.0 0.9

3,500 to 3,999........................................................ 1.8 0.4 0.3 0.6 0.5

4,000 or More........................................................ 3.5 0.8 0.4 1.3 1.0

Number of Rooms Cooled by Central

Air-Conditioning in Summer 2005

None...................................................................... 1.4 0.7 Q Q Q

1............................................................................ 0.7 0.3 Q Q Q

2............................................................................ 2.1 0.7 0.4 0.5 0.4

3............................................................................ 7.5 3.7 1.2 1.6 1.1

4............................................................................ 7.9 3.6 1.6 1.4 1.2

5 or More............................................................... 46.3 16.8 7.4 12.6 9.6

Proportion of Rooms Air-Conditioned

None...................................................................... 1.4 0.7 Q Q Q

Some, But Not all of the Rooms............................. 8.4 3.0 1.3 2.4 1.7

All of the Rooms.................................................... 56.1 22.2 9.5 13.9 10.5

Frequency of Central Air-Conditioner Use

Never..................................................................... 1.4 0.7 Q Q Q

Only a Few Times When Needed.......................... 11.4 4.9 1.8 2.9 1.8

Quite a Bit.............................................................. 12.6 4.9 2.1 3.1 2.5

All Summer............................................................ 40.5 15.3 6.8 10.3 8.0

Table HC8.7 Air-Conditioning Usage Indicators by Urban/Rural Location, 2005

Housing

Units 

(millions)

 Million U.S. Housing Units

Air-Conditioning Usage Indicators

Urban/Rural Location

(as Self-Reported)

City Town Surburbs Rural

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC8.7 Air-Conditioning Usage Indicators by Urban/Rural Location, 2005

Housing

Units 

(millions)

 Million U.S. Housing Units

Air-Conditioning Usage Indicators

Urban/Rural Location

(as Self-Reported)

City Town Surburbs Rural

At Home Behavior

Home Used for Business

Yes..................................................................... 6.4 1.8 0.8 1.9 2.0

No...................................................................... 59.5 24.0 10.1 14.7 10.6

Someone Home All Day

Yes..................................................................... 32.7 11.5 6.2 8.1 7.0

No...................................................................... 33.1 14.3 4.7 8.5 5.6

Housing Unit Characteristics Affecting Usage

Large Tree(s) that Shade the Home

Yes........................................................................ 31.6 11.7 5.1 8.0 6.8

No.......................................................................... 34.3 14.1 5.9 8.5 5.7

Adequacy of Insulation

Well Insulated........................................................ 29.5 10.2 4.8 7.5 6.9

Adequately Insulated............................................. 27.9 11.5 4.7 7.1 4.6

Poorly Insulated..................................................... 7.3 3.3 1.2 1.9 1.0

No Insulation.......................................................... 0.3 Q Q Q N

Don't Know............................................................ 0.9 0.5 Q Q Q

Home Is Too Drafty During the Winter

Never..................................................................... 42.6 16.4 7.1 10.3 8.9

Some of the Time.................................................. 16.3 6.4 2.5 4.4 3.0

Most of the Time.................................................... 2.5 1.2 0.5 0.6 0.2

All of the Time........................................................ 2.2 1.0 0.4 0.5 0.3

Don't Know............................................................ 2.2 0.8 0.5 0.8 Q

Unusually High Ceilings

Yes........................................................................ 20.3 6.9 2.5 7.3 3.7

No.......................................................................... 41.9 18.0 8.0 8.9 7.0

Not Asked (Mobile Homes).................................... 3.7 0.9 0.5 0.4 1.9

Cathederal Ceilings

(In Housing Units with High Ceilings)

Yes................................................................. 13.5 4.7 1.5 5.1 2.3

No................................................................... 6.7 2.2 0.9 2.2 1.4

Type of Glass in Windows

Single-pane Glass.................................................. 27.4 14.0 4.4 5.4 3.7

Double-pane Glass

Without Low-e Coating....................................... 31.5 10.2 5.7 8.9 6.7

With Low-e Coating............................................ 5.8 1.4 0.6 2.1 1.8

Triple-pane Glass

Without Low-e Coating....................................... 0.8 QQQQ

With Low-e Coating............................................ Q N Q Q Q

Proportion of Windows Replaced

All.......................................................................... 11.5 4.0 2.3 3.1 2.0

Some..................................................................... 11.1 4.3 1.8 2.9 2.1

None...................................................................... 40.9 16.4 6.3 9.9 8.3

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC8.7 Air-Conditioning Usage Indicators by Urban/Rural Location, 2005

Housing

Units 

(millions)

 Million U.S. Housing Units

Air-Conditioning Usage Indicators

Urban/Rural Location

(as Self-Reported)

City Town Surburbs Rural

Thermostats

Thermostat Available During Summer

Yes........................................................................ 63.9 25.1 10.5 16.1 12.2

No.......................................................................... 1.9 0.7 0.5 0.5 0.3

Do Not Use Central Air-Conditioning...................... 45.2 21.3 8.0 6.1 9.8

Use a Programmable Thermostat

Yes................................................................. 25.0 10.0 3.8 7.2 3.9

No................................................................... 38.9 15.0 6.6 8.9 8.3

Use of Programmable Thermostats

Adjusts Temperature During Day

Yes..................................................................... 15.1 5.9 2.5 4.4 2.3

No...................................................................... 9.9 4.1 1.4 2.8 1.6

Adjusts Temperature at Night

Yes..................................................................... 15.4 5.8 2.5 4.6 2.5

No...................................................................... 9.6 4.2 1.3 2.6 1.4

Do Not Use Central Air-Conditioning...................... 45.2 21.3 8.0 6.1 9.8

Summer 2005 Temperature Settings

Higher Temperature Settings

Daytime When No One is Home

Yes..................................................................... 0.5 QQQQ

No...................................................................... 50.8 19.3 8.4 12.9 10.2

Unknown............................................................ 14.5 6.2 2.4 3.5 2.3

Do Not Use Central Air-Conditioning.................. 45.2 21.3 8.0 6.1 9.8

At Night During Sleeping Hours

Yes 7.3 2.3 1.3 2.2 1.5

No...................................................................... 44.3 17.3 7.3 10.9 8.8

Unknown............................................................ 14.2 6.1 2.3 3.5 2.3

Do Not Use Central Air-Conditioning...................... 45.2 21.3 8.0 6.1 9.8

Daytime Setting When Someone is Home

Air Conditioner Turned On..................................... 52.0 19.8 8.7 13.2 10.4

69 Degrees or Less............................................ 4.8 1.8 1.0 1.2 0.7

70 Degrees......................................................... 7.2 3.0 1.3 1.5 1.4

71 to 73 Degrees................................................ 8.8 3.1 1.3 2.6 1.8

74 to 76 Degrees................................................ 16.5 5.4 3.1 4.2 3.7

77 to 79 Degrees................................................ 11.1 4.9 1.5 2.6 2.0

80 Degrees or More........................................... 3.7 1.6 0.4 1.0 0.7

Dont Know/No Answer....................................... 1.1 0.4 Q 0.3 Q

Do Not Use Central Air Conditioning...................... 45.2 21.3 8.0 6.1 9.8

Daytime Setting When No On is at Home

Air Conditioner Turned On..................................... 49.5 18.5 8.3 12.5 10.1

69 Degrees or Less............................................ 3.6 1.4 0.8 0.7 0.6

70 Degrees......................................................... 5.2 2.3 0.8 1.1 1.0

71 to 73 Degrees................................................ 6.0 2.1 1.0 1.4 1.5

74 to 76 Degrees................................................ 13.8 4.5 2.4 3.7 3.2

77 to 79 Degrees................................................ 10.7 4.3 1.8 2.8 1.8

80 Degrees or More........................................... 10.2 4.0 1.4 2.8 2.1

Dont Know/No Answer....................................... 1.6 0.6 0.3 0.4 Q

Air-Conditioner Turned Off..................................... 2.0 1.1 0.3 0.5 Q

Do Not Use Central Air Conditioning...................... 45.2 21.3 8.0 6.1 9.8

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC8.7 Air-Conditioning Usage Indicators by Urban/Rural Location, 2005

Housing

Units 

(millions)

 Million U.S. Housing Units

Air-Conditioning Usage Indicators

Urban/Rural Location

(as Self-Reported)

City Town Surburbs Rural

Setting During Seeping Hours

Air Conditioner Turned On 51.0 19.3 8.6 13.0 10.1

69 Degrees or Less............................................ 5.7 2.1 1.2 1.3 1.0

70 Degrees......................................................... 7.7 3.1 1.3 1.8 1.6

71 to 73 Degrees................................................ 8.3 2.8 1.4 2.3 1.8

74 to 76 Degrees................................................ 15.5 5.4 2.7 4.1 3.2

77 to 79 Degrees................................................ 9.7 4.2 1.4 2.3 1.8

80 Degrees or More........................................... 4.1 1.7 0.6 1.2 0.7

Dont Know/No Answer....................................... 1.3 0.6 Q 0.3 0.3

Air-Conditioner Turned Off..................................... 0.8 0.4 Q Q Q

Do Not Use Central Air Conditioning...................... 45.2 21.3 8.0 6.1 9.8

Dehumidifier Use Each Year

Use a Humidifier........................................................ 13.3 3.8 2.7 3.7 3.1

1 to 3 Months Each Year....................................... 5.1 1.6 1.4 1.4 0.8

4 to 6 Months Each Year....................................... 4.4 1.4 0.7 1.0 1.4

7 to 9 Months Each Year....................................... 0.9 Q Q 0.4 Q

10 to 11 Months..................................................... Q Q N Q Q

Turned on All Year Long........................................ 2.6 0.6 0.5 0.8 0.6

Do Not Use a Dehumidifier........................................ 97.8 43.3 16.3 19.0 19.2

Window/Wall Air Conditioners

Frequency Most Used Unit Was Used

Never..................................................................... 0.6 0.3 Q Q Q

Only a Few Times When Needed.......................... 12.1 5.8 2.2 1.7 2.4

Quite a Bit.............................................................. 7.5 3.2 1.7 1.1 1.6

All Summer............................................................ 8.6 4.1 1.5 1.0 2.0

Energy Star Wall/Window (Most-Used) Unit

Yes........................................................................ 4.6 1.9 1.1 0.6 1.0

No.......................................................................... 2.7 1.3 0.5 Q 0.6

Don't Know............................................................ 7.0 3.7 1.1 1.0 1.2

Unit is More Than 4 Years Old............................... 14.6 6.5 2.8 2.0 3.3

Use a Swamp Cooler (Asked Only in Arid Areas)

Yes............................................................................ 3.4 1.8 0.3 0.4 0.8

No............................................................................. 41.9 19.6 5.6 8.6 8.0

Not Asked.................................................................. 65.8 25.6 13.0 13.7 13.5

 1. In the 2005 RECS 1.5 million housing units reported having both central and window/wall air conditioners.

 2. The number of housing units using air-conditioning includes a small, undetermined number of housing units where the fuel for 

central air-conditioning was some fuel other than electricity; these housing units were treated as if the air-condtioning fuel was 

electricity.

 Q = Data withheld either because the Relative Standard Error (RSE) was greater than 50 percent or fewer than 10 households

were sampled.

 N = No cases in reporting sample.

 Notes: ● Because of rounding, data may not sum to totals. ● See Glossary for definition of terms used in these tables.

 Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 2005 

Residential Energy Consumption Survey.

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
 Million U.S. Housing Units

Total......................................................................... 111.1 10.9 26.1 27.3 24.0 22.8

Do Not Have Cooling Equipment........................... 17.8 3.2 4.7 3.6 5.5 0.9

Have Cooling Equipment........................................ 93.3 7.7 21.4 23.7 18.5 21.9

Use Cooling Equipment......................................... 91.4 7.6 21.0 23.4 17.9 21.7

Have Equipment But Do Not Use it........................ 1.9 Q 0.4 0.4 0.6 0.3

Type of Air-Conditioning Equipment2, 3

Central System..................................................... 65.9 4.8 12.3 15.1 14.9 18.7

Without a Heat Pump......................................... 53.5 4.7 11.5 11.6 12.3 13.6

With a Heat Pump.............................................. 12.3 Q 0.9 3.5 2.7 5.2

Window/Wall Units.............................................. 28.9 3.1 9.3 8.8 4.0 3.7

1 Unit................................................................. 14.5 2.1 5.0 3.6 2.4 1.4

2 Units................................................................ 9.1 0.7 2.9 3.3 1.0 1.2

3 or More Units.................................................. 5.4 0.3 1.5 1.9 0.6 1.1

Central Air-Conditioning Usage

Air-Conditioned Floorspace (Square Feet)

None.................................................................. 45.2 6.2 13.7 12.2 9.0 4.1

1 to 499.............................................................. 3.9 Q 0.7 0.6 1.2 1.2

500 to 999.......................................................... 15.0 0.7 2.6 2.8 4.3 4.7

1,000 to 1,499.................................................... 15.6 0.8 2.7 3.3 4.0 4.8

1,500 to 1,999.................................................... 11.1 0.7 2.2 2.4 2.1 3.8

2,000 to 2,499.................................................... 7.0 0.8 1.2 1.9 1.3 1.8

2,500 to 2,999.................................................... 5.2 0.5 1.1 1.4 1.0 1.2

3,000 or 3,499.................................................... 2.7 0.3 0.7 0.9 0.4 0.4

3,500 to 3,999.................................................... 1.8 0.3 0.4 0.6 0.3 Q

4,000 or More..................................................... 3.5 0.4 0.9 1.1 0.5 0.6

Number of Rooms Cooled by Central

Air-Conditioning in Summer 2005

None.................................................................. 1.4 Q 0.3 Q 0.6 0.2

1......................................................................... 0.7 N QQQQ

2......................................................................... 2.1 Q 0.5 0.4 0.5 0.5

3......................................................................... 7.5 0.4 1.4 1.3 2.0 2.4

4......................................................................... 7.9 0.4 1.2 1.8 1.9 2.6

5 or More............................................................ 46.3 3.7 8.9 11.2 9.9 12.7

Proportion of Rooms Air-Conditioned

None.................................................................. 1.4 Q 0.3 Q 0.6 0.2

Some, But Not all of the Rooms......................... 8.4 0.7 1.8 1.6 2.4 1.9

All of the Rooms................................................. 56.1 4.0 10.2 13.2 12.0 16.6

Frequency of Central Air-Conditioner Use

Never................................................................. 1.4 Q 0.3 Q 0.6 0.2

Only a Few Times When Needed....................... 11.4 1.7 3.1 2.3 3.5 0.9

Quite a Bit.......................................................... 12.6 1.6 3.3 2.8 2.9 2.0

All Summer........................................................ 40.5 1.4 5.6 9.8 8.0 15.6

Table HC9.7 Air-Conditioning Usage Indicators by Climate Zone, 2005

Air-Conditioning Usage Indicators

2,000 CDD 

or More

and Less 

than 4,000 

HDD

Less than 2,000 CDD and --

Greater than 

7,000 HDD

5,500 to 

7,000 HDD

4,000 to 

5,499 HDD

Less than 

4,000 HDD

Housing 

Units 

(millions)

Climate Zone1

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
 Million U.S. Housing Units

Table HC9.7 Air-Conditioning Usage Indicators by Climate Zone, 2005

Air-Conditioning Usage Indicators

2,000 CDD 

or More

and Less 

than 4,000 

HDD

Less than 2,000 CDD and --

Greater than 

7,000 HDD

5,500 to 

7,000 HDD

4,000 to 

5,499 HDD

Less than 

4,000 HDD

Housing 

Units 

(millions)

Climate Zone1

At Home Behavior

Home Used for Business

Yes................................................................. 6.4 0.7 1.0 1.5 1.4 1.8

No.................................................................. 59.5 4.0 11.3 13.6 13.5 16.9

Someone Home All Day

Yes................................................................. 32.7 1.8 6.4 7.2 7.7 9.6

No.................................................................. 33.1 2.9 5.9 7.9 7.2 9.2

Housing Unit Characteristics Affecting Usage

Large Tree(s) that Shade the Home

Yes.................................................................... 31.6 2.6 5.8 7.9 7.1 8.2

No...................................................................... 34.3 2.1 6.6 7.1 7.9 10.6

Adequacy of Insulation

Well Insulated.................................................... 29.5 2.6 5.7 7.2 6.7 7.4

Adequately Insulated.......................................... 27.9 1.8 5.3 5.8 6.5 8.6

Poorly Insulated................................................. 7.3 0.4 1.2 2.0 1.5 2.3

No Insulation...................................................... 0.3 N QQQQ

Don't Know......................................................... 0.9 Q Q Q Q 0.3

Home Is Too Drafty During the Winter

Never................................................................. 42.6 3.1 7.3 9.0 9.6 13.6

Some of the Time............................................... 16.3 1.2 3.5 4.1 3.9 3.4

Most of the Time................................................ 2.5 Q 0.6 0.6 0.6 0.6

All of the Time.................................................... 2.2 Q 0.5 0.8 0.5 0.4

Don't Know......................................................... 2.2 Q 0.4 0.5 0.3 0.8

Unusually High Ceilings

Yes.................................................................... 20.3 1.5 3.7 4.0 4.9 6.2

No...................................................................... 41.9 3.1 8.3 10.4 9.0 11.1

Not Asked (Mobile Homes)................................ 3.7 Q 0.4 0.7 1.0 1.4

Cathederal Ceilings

(In Housing Units with High Ceilings)

Yes............................................................. 13.5 1.2 2.5 2.5 3.2 4.2

No............................................................... 6.7 0.4 1.2 1.5 1.7 2.0

Type of Glass in Windows

Single-pane Glass.............................................. 27.4 1.3 3.1 4.4 7.1 11.5

Double-pane Glass

Without Low-e Coating................................... 31.5 2.4 7.4 8.9 6.8 6.0

With Low-e Coating........................................ 5.8 1.0 1.6 1.4 1.0 1.0

Triple-pane Glass

Without Low-e Coating................................... 0.8 QQQQQ

With Low-e Coating........................................ Q Q Q N Q Q

Proportion of Windows Replaced

All....................................................................... 11.5 0.7 3.3 3.4 2.3 1.7

Some................................................................. 11.1 1.2 2.4 2.7 2.2 2.6

None.................................................................. 40.9 2.8 6.3 8.3 10.1 13.5

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
 Million U.S. Housing Units

Table HC9.7 Air-Conditioning Usage Indicators by Climate Zone, 2005

Air-Conditioning Usage Indicators

2,000 CDD 

or More

and Less 

than 4,000 

HDD

Less than 2,000 CDD and --

Greater than 

7,000 HDD

5,500 to 

7,000 HDD

4,000 to 

5,499 HDD

Less than 

4,000 HDD

Housing 

Units 

(millions)

Climate Zone1

Thermostats

Thermostat Available During Summer

Yes.................................................................... 63.9 4.7 11.8 14.6 14.6 18.3

No...................................................................... 1.9 Q 0.6 0.5 0.4 0.5

Do Not Use Central Air-Conditioning.................. 45.2 6.2 13.7 12.2 9.0 4.1

Use a Programmable Thermostat

Yes............................................................. 25.0 2.2 5.5 4.9 6.6 5.8

No............................................................... 38.9 2.5 6.3 9.7 8.0 12.4

Use of Programmable Thermostats

Adjusts Temperature During Day

Yes................................................................. 15.1 1.3 3.4 2.9 4.0 3.6

No.................................................................. 9.9 0.9 2.2 2.0 2.6 2.2

Adjusts Temperature at Night

Yes................................................................. 15.4 1.4 3.4 3.0 4.0 3.7

No.................................................................. 9.6 0.8 2.1 2.0 2.6 2.1

Do Not Use Central Air-Conditioning.................. 45.2 6.2 13.7 12.2 9.0 4.1

Summer 2005 Temperature Settings

Higher Temperature Settings

Daytime When No One is Home

Yes................................................................. 0.5 N QQQQ

No.................................................................. 50.8 2.9 8.5 12.1 10.2 17.1

Unknown........................................................ 14.5 1.8 3.7 2.9 4.7 1.4

Do Not Use Central Air-Conditioning.............. 45.2 6.2 13.7 12.2 9.0 4.1

At Night During Sleeping Hours

Yes................................................................. 7.3 0.3 1.2 1.5 1.4 2.9

No.................................................................. 44.3 2.6 7.5 10.8 9.0 14.4

Unknown........................................................ 14.2 1.8 3.7 2.8 4.6 1.4

Do Not Use Central Air-Conditioning.................. 45.2 6.2 13.7 12.2 9.0 4.1

Daytime Setting When Someone is Home

Air Conditioner Turned On................................. 52.0 3.0 8.7 12.3 10.6 17.4

69 Degrees or Less........................................ 4.8 0.3 1.0 1.7 1.1 0.6

70 Degrees..................................................... 7.2 0.5 1.3 2.1 1.6 1.8

71 to 73 Degrees............................................ 8.8 0.5 2.0 2.2 2.0 2.1

74 to 76 Degrees............................................ 16.5 1.3 2.5 3.9 3.2 5.6

77 to 79 Degrees............................................ 11.1 0.4 1.6 1.8 2.1 5.2

80 Degrees or More........................................ 3.7 Q 0.4 0.7 0.5 2.1

Dont Know/No Answer.................................... 1.1 Q Q 0.3 0.3 Q

Do Not Use Central Air Conditioning.................. 45.2 6.2 13.7 12.2 9.0 4.1

Daytime Setting When No On is at Home

Air Conditioner Turned On................................. 49.5 2.7 8.2 12.1 9.5 17.0

69 Degrees or Less........................................ 3.6 Q 0.8 1.2 0.8 0.6

70 Degrees..................................................... 5.2 0.3 1.0 1.7 1.1 1.1

71 to 73 Degrees............................................ 6.0 0.3 1.1 1.8 1.4 1.4

74 to 76 Degrees............................................ 13.8 1.2 2.4 3.6 2.6 4.0

77 to 79 Degrees............................................ 10.7 0.6 1.7 2.1 1.7 4.7

80 Degrees or More........................................ 10.2 0.3 1.2 1.6 2.0 5.2

Dont Know/No Answer.................................... 1.6 Q 0.3 0.3 0.6 Q

Air-Conditioner Turned Off................................. 2.0 Q 0.4 Q 0.8 0.4

Do Not Use Central Air Conditioning.................. 45.2 6.2 13.7 12.2 9.0 4.1

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
 Million U.S. Housing Units

Table HC9.7 Air-Conditioning Usage Indicators by Climate Zone, 2005

Air-Conditioning Usage Indicators

2,000 CDD 

or More

and Less 

than 4,000 

HDD

Less than 2,000 CDD and --

Greater than 

7,000 HDD

5,500 to 

7,000 HDD

4,000 to 

5,499 HDD

Less than 

4,000 HDD

Housing 

Units 

(millions)

Climate Zone1

Setting During Seeping Hours

Air Conditioner Turned On 51.0 2.8 8.6 12.2 9.9 17.4

69 Degrees or Less........................................ 5.7 0.4 1.2 1.8 1.5 0.9

70 Degrees..................................................... 7.7 0.4 1.5 2.2 1.6 1.9

71 to 73 Degrees............................................ 8.3 0.4 1.7 2.3 1.6 2.4

74 to 76 Degrees............................................ 15.5 1.2 2.5 3.6 2.8 5.5

77 to 79 Degrees............................................ 9.7 0.4 1.3 1.7 1.6 4.6

80 Degrees or More........................................ 4.1 Q 0.5 0.7 0.9 2.0

Dont Know/No Answer.................................... 1.3 Q 0.2 0.2 0.5 Q

Air-Conditioner Turned Off................................. 0.8 Q Q Q 0.4 Q

Do Not Use Central Air Conditioning.................. 45.2 6.2 13.7 12.2 9.0 4.1

Dehumidifier Use Each Year

Use a Humidifier.................................................... 13.3 3.0 5.6 3.4 0.7 0.5

1 to 3 Months Each Year.................................... 5.1 1.2 2.3 1.1 Q Q

4 to 6 Months Each Year.................................... 4.4 1.3 2.0 1.0 Q Q

7 to 9 Months Each Year.................................... 0.9 Q 0.4 0.3 Q Q

10 to 11 Months................................................. Q N Q Q Q N

Turned on All Year Long.................................... 2.6 0.4 0.9 0.9 0.3 Q

Do Not Use a Dehumidifier.................................... 97.8 7.9 20.4 23.9 23.2 22.3

Window/Wall Air Conditioners

Frequency Most Used Unit Was Used

Never................................................................. 0.6 QQQQQ

Only a Few Times When Needed....................... 12.1 1.5 4.2 3.8 1.7 0.9

Quite a Bit.......................................................... 7.5 1.0 2.6 2.1 0.9 0.9

All Summer........................................................ 8.6 0.4 2.4 2.7 1.3 1.7

Energy Star Wall/Window (Most-Used) Unit

Yes.................................................................... 4.6 0.5 1.5 1.4 0.5 0.7

No...................................................................... 2.7 0.3 0.8 0.7 0.3 0.5

Don't Know......................................................... 7.0 0.7 2.4 2.2 1.0 0.7

Unit is More Than 4 Years Old........................... 14.6 1.6 4.6 4.4 2.1 1.8

Use a Swamp Cooler (Asked Only in Arid Areas)

Yes........................................................................ 3.4 0.3 0.8 Q 1.1 0.5

No.......................................................................... 41.9 2.2 3.8 3.8 17.7 14.5

Not Asked.............................................................. 65.8 8.5 21.5 22.8 5.3 7.9

 1. One of five climatically distinct areas, determined according to the 30-year average (1971-2000) of the annual heating and cooling 

degree-days. A household is assigned to a climate zone according to the 30-year average annual degree-days for an appropriate nearby 

weather station.

 2. In the 2005 RECS 1.5 million housing units reported having both central and window/wall air conditioners.

 3. The number of housing units using air-conditioning includes a small, undetermined number of housing units where the fuel for 

central air-conditioning was some fuel other than electricity; these housing units were treated as if the air-condtioning fuel was electricity.

 Q = Data withheld either because the Relative Standard Error (RSE) was greater than 50 percent or fewer than 10 households were 

sampled.

 N = No cases in reporting sample.

 Notes: ● Because of rounding, data may not sum to totals. ● See Glossary for definition of terms used in these tables.

 Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 2005 

Residential Energy Consumption Survey.

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Total............................................................................. 111.1 20.6 25.6 40.7 24.2

Do Not Have Cooling Equipment............................... 17.8 4.0 2.1 1.4 10.3

Have Cooling Equipment............................................ 93.3 16.5 23.5 39.3 13.9

Use Cooling Equipment............................................. 91.4 16.3 23.4 38.9 12.9

Have Equipment But Do Not Use it............................ 1.9 0.3 Q 0.5 1.0

Type of Air-Conditioning Equipment1, 2

Central System........................................................ 65.9 6.0 17.3 32.1 10.5

Without a Heat Pump............................................. 53.5 5.5 16.2 23.2 8.7

With a Heat Pump................................................. 12.3 0.5 1.1 9.0 1.7

Window/Wall Units.................................................. 28.9 10.7 6.6 8.0 3.6

1 Unit..................................................................... 14.5 4.3 4.1 3.1 2.9

2 Units................................................................... 9.1 4.1 1.8 2.8 0.4

3 or More Units...................................................... 5.4 2.3 0.7 2.1 0.3

Central Air-Conditioning Usage

Air-Conditioned Floorspace (Square Feet)

None...................................................................... 45.2 14.6 8.3 8.6 13.7

1 to 499.................................................................. 3.9 Q 0.8 2.0 1.0

500 to 999.............................................................. 15.0 1.1 3.0 7.7 3.2

1,000 to 1,499........................................................ 15.6 1.2 3.9 8.2 2.3

1,500 to 1,999........................................................ 11.1 1.3 2.4 5.7 1.7

2,000 to 2,499........................................................ 7.0 0.5 2.3 3.3 0.8

2,500 to 2,999........................................................ 5.2 0.6 1.7 2.1 0.8

3,000 or 3,499........................................................ 2.7 0.4 1.1 1.0 Q

3,500 to 3,999........................................................ 1.8 0.2 0.8 0.6 Q

4,000 or More........................................................ 3.5 0.4 1.4 1.4 0.3

Number of Rooms Cooled by Central

Air-Conditioning in Summer 2005

None...................................................................... 1.4 Q Q 0.4 0.8

1............................................................................ 0.7 Q Q 0.4 Q

2............................................................................ 2.1 0.3 0.4 0.8 0.6

3............................................................................ 7.5 0.3 1.9 3.9 1.4

4............................................................................ 7.9 0.7 1.5 4.6 1.0

5 or More............................................................... 46.3 4.5 13.2 22.0 6.7

Proportion of Rooms Air-Conditioned

None...................................................................... 1.4 Q Q 0.4 0.8

Some, But Not all of the Rooms............................. 8.4 0.7 2.3 3.6 1.9

All of the Rooms.................................................... 56.1 5.2 14.9 28.2 7.8

Frequency of Central Air-Conditioner Use

Never..................................................................... 1.4 Q Q 0.4 0.8

Only a Few Times When Needed.......................... 11.4 1.6 3.9 2.5 3.4

Quite a Bit.............................................................. 12.6 1.2 4.5 4.5 2.4

All Summer............................................................ 40.5 3.0 8.8 24.8 3.9

Housing

Units 

(millions)

Table HC10.7 Air-Conditioning Usage Indicators by U.S. Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators

U.S. Census Region

Northeast Midwest South West

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Housing

Units 

(millions)

Table HC10.7 Air-Conditioning Usage Indicators by U.S. Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators

U.S. Census Region

Northeast Midwest South West

At Home Behavior

Home Used for Business

Yes..................................................................... 6.4 0.6 1.7 2.8 1.4

No...................................................................... 59.5 5.4 15.6 29.4 9.1

Someone Home All Day

Yes..................................................................... 32.7 3.5 8.4 15.1 5.7

No...................................................................... 33.1 2.5 8.9 17.0 4.8

Housing Unit Characteristics Affecting Usage

Large Tree(s) that Shade the Home

Yes........................................................................ 31.6 3.0 9.3 14.7 4.6

No.......................................................................... 34.3 3.0 8.0 17.4 5.8

Adequacy of Insulation

Well Insulated........................................................ 29.5 2.7 8.2 14.1 4.4

Adequately Insulated............................................. 27.9 2.3 7.1 13.9 4.6

Poorly Insulated..................................................... 7.3 0.9 1.7 3.6 1.1

No Insulation.......................................................... 0.3 N Q Q Q

Don't Know............................................................ 0.9 Q 0.3 0.5 Q

Home Is Too Drafty During the Winter

Never..................................................................... 42.6 3.4 10.7 22.1 6.4

Some of the Time.................................................. 16.3 1.7 4.5 7.2 2.9

Most of the Time.................................................... 2.5 0.3 0.7 1.1 0.4

All of the Time........................................................ 2.2 0.3 0.7 0.7 0.4

Don't Know............................................................ 2.2 Q 0.7 1.0 0.4

Unusually High Ceilings

Yes........................................................................ 20.3 1.6 5.1 9.1 4.4

No.......................................................................... 41.9 4.2 11.6 20.5 5.5

Not Asked (Mobile Homes).................................... 3.7 Q 0.5 2.5 0.6

Cathederal Ceilings

(In Housing Units with High Ceilings)

Yes................................................................. 13.5 1.1 3.2 6.2 3.1

No................................................................... 6.7 0.5 2.0 2.9 1.3

Type of Glass in Windows

Single-pane Glass.................................................. 27.4 1.3 4.6 17.1 4.4

Double-pane Glass

Without Low-e Coating....................................... 31.5 3.9 9.8 13.0 4.8

With Low-e Coating............................................ 5.8 0.6 2.4 1.7 1.1

Triple-pane Glass

Without Low-e Coating....................................... 0.8 Q 0.3 Q Q

With Low-e Coating............................................ QQQQQ

Proportion of Windows Replaced

All.......................................................................... 11.5 2.0 3.9 4.1 1.5

Some..................................................................... 11.1 1.1 3.7 4.3 2.0

None...................................................................... 40.9 2.7 9.3 22.3 6.6

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Housing

Units 

(millions)

Table HC10.7 Air-Conditioning Usage Indicators by U.S. Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators

U.S. Census Region

Northeast Midwest South West

Thermostats

Thermostat Available During Summer

Yes........................................................................ 63.9 5.5 17.0 31.4 10.1

No.......................................................................... 1.9 0.5 0.3 0.7 0.4

Do Not Use Central Air-Conditioning...................... 45.2 14.6 8.3 8.6 13.7

Use a Programmable Thermostat

Yes................................................................. 25.0 2.8 6.8 9.4 6.0

No................................................................... 38.9 2.7 10.1 22.0 4.1

Use of Programmable Thermostats

Adjusts Temperature During Day

Yes..................................................................... 15.1 2.2 3.8 5.7 3.5

No...................................................................... 9.9 0.6 3.0 3.7 2.5

Adjusts Temperature at Night

Yes..................................................................... 15.4 2.1 4.0 5.8 3.5

No...................................................................... 9.6 0.7 2.8 3.6 2.5

Do Not Use Central Air-Conditioning...................... 45.2 14.6 8.3 8.6 13.7

Summer 2005 Temperature Settings

Higher Temperature Settings

Daytime When No One is Home

Yes..................................................................... 0.5 Q Q 0.4 N

No...................................................................... 50.8 4.0 12.9 28.2 5.7

Unknown............................................................ 14.5 1.8 4.4 3.6 4.8

Do Not Use Central Air-Conditioning.................. 45.2 14.6 8.3 8.6 13.7

At Night During Sleeping Hours

Yes..................................................................... 7.3 0.7 1.6 4.1 0.9

No...................................................................... 44.3 3.4 11.4 24.6 4.9

Unknown............................................................ 14.2 1.8 4.3 3.4 4.7

Do Not Use Central Air-Conditioning...................... 45.2 14.6 8.3 8.6 13.7

Daytime Setting When Someone is Home

Air Conditioner Turned On..................................... 52.0 4.1 13.0 28.9 6.0

69 Degrees or Less............................................ 4.8 0.7 1.3 2.4 0.4

70 Degrees......................................................... 7.2 0.9 1.9 3.8 0.7

71 to 73 Degrees................................................ 8.8 0.9 2.6 4.3 0.9

74 to 76 Degrees................................................ 16.5 1.1 4.2 9.6 1.6

77 to 79 Degrees................................................ 11.1 0.4 2.4 6.6 1.7

80 Degrees or More........................................... 3.7 Q 0.6 2.2 0.8

Dont Know/No Answer....................................... 1.1 Q 0.3 0.4 0.3

Do Not Use Central Air Conditioning...................... 45.2 14.6 8.3 8.6 13.7

Daytime Setting When No On is at Home

Air Conditioner Turned On..................................... 49.5 4.0 12.6 28.0 4.9

69 Degrees or Less............................................ 3.6 0.5 0.9 1.9 Q

70 Degrees......................................................... 5.2 0.6 1.4 2.8 0.4

71 to 73 Degrees................................................ 6.0 0.7 1.7 3.1 0.5

74 to 76 Degrees................................................ 13.8 1.1 4.1 7.5 1.1

77 to 79 Degrees................................................ 10.7 0.7 2.7 6.4 1.0

80 Degrees or More........................................... 10.2 0.4 1.8 6.3 1.8

Dont Know/No Answer....................................... 1.6 Q 0.3 0.6 0.5

Air-Conditioner Turned Off..................................... 2.0 Q 0.4 0.6 0.8

Do Not Use Central Air Conditioning...................... 45.2 14.6 8.3 8.6 13.7

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Housing

Units 

(millions)

Table HC10.7 Air-Conditioning Usage Indicators by U.S. Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators

U.S. Census Region

Northeast Midwest South West

Setting During Seeping Hours

Air Conditioner Turned On 51.0 4.0 12.9 28.7 5.3

69 Degrees or Less............................................ 5.7 0.7 1.5 3.0 0.5

70 Degrees......................................................... 7.7 1.0 2.0 4.1 0.5

71 to 73 Degrees................................................ 8.3 0.9 2.4 4.3 0.8

74 to 76 Degrees................................................ 15.5 1.0 4.1 9.0 1.4

77 to 79 Degrees................................................ 9.7 0.4 2.1 5.9 1.3

80 Degrees or More........................................... 4.1 Q 0.8 2.3 0.8

Dont Know/No Answer....................................... 1.3 Q Q 0.5 0.5

Air-Conditioner Turned Off..................................... 0.8 Q Q Q 0.5

Do Not Use Central Air Conditioning...................... 45.2 14.6 8.3 8.6 13.7

Dehumidifier Use Each Year

Use a Humidifier........................................................ 13.3 4.1 6.1 2.7 0.3

1 to 3 Months Each Year....................................... 5.1 1.6 2.5 0.8 Q

4 to 6 Months Each Year....................................... 4.4 1.4 2.2 0.7 Q

7 to 9 Months Each Year....................................... 0.9 Q 0.5 0.3 Q

10 to 11 Months..................................................... QQQQQ

Turned on All Year Long........................................ 2.6 0.9 0.8 0.8 Q

Do Not Use a Dehumidifier........................................ 97.8 16.5 19.5 38.0 23.9

Window/Wall Air Conditioners

Frequency Most Used Unit Was Used

Never..................................................................... 0.6 QQQQ

Only a Few Times When Needed.......................... 12.1 4.9 3.1 2.1 2.0

Quite a Bit.............................................................. 7.5 3.0 1.6 2.2 0.7

All Summer............................................................ 8.6 2.6 1.8 3.6 0.7

Energy Star Wall/Window (Most-Used) Unit

Yes........................................................................ 4.6 2.1 0.8 1.2 0.5

No.......................................................................... 2.7 0.9 0.5 1.0 0.3

Don't Know............................................................ 7.0 2.6 1.7 1.7 1.1

Unit is More Than 4 Years Old............................... 14.6 5.1 3.6 4.1 1.8

Use a Swamp Cooler (Asked Only in Arid Areas)

Yes............................................................................ 3.4 N Q Q 3.3

No............................................................................. 41.9 Q 2.1 19.6 20.1

Not Asked.................................................................. 65.8 20.5 23.4 21.1 0.8

 1. In the 2005 RECS 1.5 million housing units reported having both central and window/wall air conditioners.

 2. The number of housing units using air-conditioning includes a small, undetermined number of housing units where the fuel for 

central air-conditioning was some fuel other than electricity; these housing units were treated as if the air-condtioning fuel was 

electricity.

 Q = Data withheld either because the Relative Standard Error (RSE) was greater than 50 percent or fewer than 10 households

were sampled.

 N = No cases in reporting sample.

 Notes: ● Because of rounding, data may not sum to totals. ● See Glossary for definition of terms used in these tables.

 Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 2005 

Residential Energy Consumption Survey.

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Total............................................................................. 111.1 20.6 15.1 5.5

Do Not Have Cooling Equipment............................... 17.8 4.0 2.4 1.7

Have Cooling Equipment............................................ 93.3 16.5 12.8 3.8

Use Cooling Equipment............................................. 91.4 16.3 12.6 3.7

Have Equipment But Do Not Use it............................ 1.9 0.3 Q Q

Type of Air-Conditioning Equipment1, 2

Central System........................................................ 65.9 6.0 5.2 0.8

Without a Heat Pump............................................. 53.5 5.5 4.8 0.7

With a Heat Pump................................................. 12.3 0.5 0.4 Q

Window/Wall Units.................................................. 28.9 10.7 7.6 3.1

1 Unit..................................................................... 14.5 4.3 2.9 1.4

2 Units................................................................... 9.1 4.1 3.1 1.1

3 or More Units...................................................... 5.4 2.3 1.7 0.6

Central Air-Conditioning Usage

Air-Conditioned Floorspace (Square Feet)

None...................................................................... 45.2 14.6 9.9 4.7

1 to 499.................................................................. 3.9 Q Q N

500 to 999.............................................................. 15.0 1.1 1.0 0.2

1,000 to 1,499........................................................ 15.6 1.2 1.0 0.2

1,500 to 1,999........................................................ 11.1 1.3 1.1 Q

2,000 to 2,499........................................................ 7.0 0.5 0.5 Q

2,500 to 2,999........................................................ 5.2 0.6 0.6 Q

3,000 or 3,499........................................................ 2.7 0.4 0.3 Q

3,500 to 3,999........................................................ 1.8 0.2 Q Q

4,000 or More........................................................ 3.5 0.4 0.4 Q

Number of Rooms Cooled by Central

Air-Conditioning in Summer 2005

None...................................................................... 1.4 Q Q Q

1............................................................................ 0.7 Q Q N

2............................................................................ 2.1 0.3 0.3 Q

3............................................................................ 7.5 0.3 0.3 Q

4............................................................................ 7.9 0.7 Q 0.2

5 or More............................................................... 46.3 4.5 3.9 0.5

Proportion of Rooms Air-Conditioned

None...................................................................... 1.4 Q Q Q

Some, But Not all of the Rooms............................. 8.4 0.7 0.6 Q

All of the Rooms.................................................... 56.1 5.2 4.5 0.6

Frequency of Central Air-Conditioner Use

Never..................................................................... 1.4 Q Q Q

Only a Few Times When Needed.......................... 11.4 1.6 1.4 0.3

Quite a Bit.............................................................. 12.6 1.2 1.1 0.1

All Summer............................................................ 40.5 3.0 2.6 0.3

Table HC11.7 Air-Conditioning Usage Indicators by Northeast Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators Middle Atlantic New England

Northeast Census Region

U.S.

Housing

Units

(millions)

Census Division

Total

Northeast

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC11.7 Air-Conditioning Usage Indicators by Northeast Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators Middle Atlantic New England

Northeast Census Region

U.S.

Housing

Units

(millions)

Census Division

Total

Northeast

At Home Behavior

Home Used for Business

Yes..................................................................... 6.4 0.6 0.5 Q

No...................................................................... 59.5 5.4 4.7 0.7

Someone Home All Day

Yes..................................................................... 32.7 3.5 3.0 0.5

No...................................................................... 33.1 2.5 2.2 0.3

Housing Unit Characteristics Affecting Usage

Large Tree(s) that Shade the Home

Yes........................................................................ 31.6 3.0 2.5 0.4

No.......................................................................... 34.3 3.0 2.7 0.3

Adequacy of Insulation

Well Insulated........................................................ 29.5 2.7 2.3 0.4

Adequately Insulated............................................. 27.9 2.3 2.1 0.2

Poorly Insulated..................................................... 7.3 0.9 0.8 Q

No Insulation.......................................................... 0.3 N N N

Don't Know............................................................ 0.9 Q Q Q

Home Is Too Drafty During the Winter

Never..................................................................... 42.6 3.4 3.0 0.5

Some of the Time.................................................. 16.3 1.7 1.5 0.2

Most of the Time.................................................... 2.5 0.3 0.3 Q

All of the Time........................................................ 2.2 0.3 Q Q

Don't Know............................................................ 2.2 Q Q Q

Unusually High Ceilings

Yes........................................................................ 20.3 1.6 1.4 0.2

No.......................................................................... 41.9 4.2 3.8 0.4

Not Asked (Mobile Homes).................................... 3.7 Q Q Q

Cathederal Ceilings

(In Housing Units with High Ceilings)

Yes................................................................. 13.5 1.1 0.9 0.2

No................................................................... 6.7 0.5 0.5 Q

Type of Glass in Windows

Single-pane Glass.................................................. 27.4 1.3 1.0 0.3

Double-pane Glass

Without Low-e Coating....................................... 31.5 3.9 3.5 0.4

With Low-e Coating............................................ 5.8 0.6 0.5 Q

Triple-pane Glass

Without Low-e Coating....................................... 0.8 Q Q N

With Low-e Coating............................................ Q Q N Q

Proportion of Windows Replaced

All.......................................................................... 11.5 2.0 1.8 0.2

Some..................................................................... 11.1 1.1 1.0 Q

None...................................................................... 40.9 2.7 2.2 0.4

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC11.7 Air-Conditioning Usage Indicators by Northeast Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators Middle Atlantic New England

Northeast Census Region

U.S.

Housing

Units

(millions)

Census Division

Total

Northeast

Thermostats

Thermostat Available During Summer

Yes........................................................................ 63.9 5.5 4.8 0.7

No.......................................................................... 1.9 0.5 0.4 Q

Do Not Use Central Air-Conditioning...................... 45.2 14.6 9.9 4.7

Use a Programmable Thermostat

Yes................................................................. 25.0 2.8 2.6 0.2

No................................................................... 38.9 2.7 2.2 0.5

Use of Programmable Thermostats

Adjusts Temperature During Day

Yes..................................................................... 15.1 2.2 2.0 0.2

No...................................................................... 9.9 0.6 0.6 Q

Adjusts Temperature at Night

Yes..................................................................... 15.4 2.1 2.0 0.2

No...................................................................... 9.6 0.7 0.6 Q

Do Not Use Central Air-Conditioning...................... 45.2 14.6 9.9 4.7

Summer 2005 Temperature Settings

Higher Temperature Settings

Daytime When No One is Home

Yes..................................................................... 0.5 Q Q Q

No...................................................................... 50.8 4.0 3.5 0.5

Unknown............................................................ 14.5 1.8 1.6 0.3

Do Not Use Central Air-Conditioning.................. 45.2 14.6 9.9 4.7

At Night During Sleeping Hours

Yes..................................................................... 7.3 0.7 0.7 Q

No...................................................................... 44.3 3.4 3.0 0.4

Unknown............................................................ 14.2 1.8 1.5 0.3

Do Not Use Central Air-Conditioning...................... 45.2 14.6 9.9 4.7

Daytime Setting When Someone is Home

Air Conditioner Turned On..................................... 52.0 4.1 3.7 0.5

69 Degrees or Less............................................ 4.8 0.7 0.5 0.1

70 Degrees......................................................... 7.2 0.9 0.7 Q

71 to 73 Degrees................................................ 8.8 0.9 0.8 Q

74 to 76 Degrees................................................ 16.5 1.1 1.1 Q

77 to 79 Degrees................................................ 11.1 0.4 0.3 Q

80 Degrees or More........................................... 3.7 Q Q N

Dont Know/No Answer....................................... 1.1 Q Q Q

Do Not Use Central Air Conditioning...................... 45.2 14.6 9.9 4.7

Setting When No On is at Home

Air Conditioner Turned On..................................... 49.5 4.0 3.5 0.5

69 Degrees or Less............................................ 3.6 0.5 0.4 0.1

70 Degrees......................................................... 5.2 0.6 0.5 Q

71 to 73 Degrees................................................ 6.0 0.7 0.7 Q

74 to 76 Degrees................................................ 13.8 1.1 1.0 Q

77 to 79 Degrees................................................ 10.7 0.7 0.5 Q

80 Degrees or More........................................... 10.2 0.4 0.3 Q

Dont Know/No Answer....................................... 1.6 Q Q Q

Air-Conditioner Turned Off..................................... 2.0 Q Q N

Do Not Use Central Air Conditioning...................... 45.2 14.6 9.9 4.7

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC11.7 Air-Conditioning Usage Indicators by Northeast Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators Middle Atlantic New England

Northeast Census Region

U.S.

Housing

Units

(millions)

Census Division

Total

Northeast

Setting During Seeping Hours

Air Conditioner Turned On 51.0 4.0 3.6 0.5

69 Degrees or Less............................................ 5.7 0.7 0.5 0.1

70 Degrees......................................................... 7.7 1.0 0.9 Q

71 to 73 Degrees................................................ 8.3 0.9 0.8 Q

74 to 76 Degrees................................................ 15.5 1.0 0.9 Q

77 to 79 Degrees................................................ 9.7 0.4 0.3 Q

80 Degrees or More........................................... 4.1 Q Q Q

Dont Know/No Answer....................................... 1.3 Q Q Q

Air-Conditioner Turned Off..................................... 0.8 Q Q N

Do Not Use Central Air Conditioning...................... 45.2 14.6 9.9 4.7

Dehumidifier Use Each Year

Use a Humidifier........................................................ 13.3 4.1 2.7 1.4

1 to 3 Months Each Year....................................... 5.1 1.6 0.8 0.8

4 to 6 Months Each Year....................................... 4.4 1.4 0.9 0.5

7 to 9 Months Each Year....................................... 0.9 Q Q Q

10 to 11 Months..................................................... QQQQ

Turned on All Year Long........................................ 2.6 0.9 0.7 0.1

Do Not Use a Dehumidifier........................................ 97.8 16.5 12.5 4.0

Window/Wall Air Conditioners

Frequency Most Used Unit Was Used

Never..................................................................... 0.6 Q Q Q

Only a Few Times When Needed.......................... 12.1 4.9 3.4 1.5

Quite a Bit.............................................................. 7.5 3.0 2.2 0.8

All Summer............................................................ 8.6 2.6 1.9 0.7

Energy Star Wall/Window (Most-Used) Unit

Yes........................................................................ 4.6 2.1 1.5 0.6

No.......................................................................... 2.7 0.9 0.6 0.3

Don't Know............................................................ 7.0 2.6 1.8 0.9

Unit is More Than 4 Years Old............................... 14.6 5.1 3.8 1.3

Use a Swamp Cooler (Asked Only in Arid Areas)

Yes............................................................................ 3.4 N N N

No............................................................................. 41.9 Q Q N

Not Asked.................................................................. 65.8 20.5 15.1 5.5

 1. In the 2005 RECS 1.5 million housing units reported having both central and window/wall air conditioners.

 2. The number of housing units using air-conditioning includes a small, undetermined number of housing units where the fuel for central 

air-conditioning was some fuel other than electricity; these housing units were treated as if the air-condtioning fuel was electricity.

 Q = Data withheld either because the Relative Standard Error (RSE) was greater than 50 percent or fewer than 10 households were 

sampled.

 N = No cases in reporting sample.

 Notes: ● Because of rounding, data may not sum to totals. ● See Glossary for definition of terms used in these tables.

 Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 2005 

Residential Energy Consumption Survey.

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Total............................................................................. 111.1 25.6 17.7 7.9

Do Not Have Cooling Equipment............................... 17.8 2.1 1.8 0.3

Have Cooling Equipment............................................ 93.3 23.5 16.0 7.5

Use Cooling Equipment............................................. 91.4 23.4 15.9 7.5

Have Equipment But Do Not Use it............................ 1.9 Q Q Q

Type of Air-Conditioning Equipment1, 2

Central System........................................................ 65.9 17.3 11.3 6.0

Without a Heat Pump............................................. 53.5 16.2 10.6 5.6

With a Heat Pump................................................. 12.3 1.1 0.8 0.4

Window/Wall Units.................................................. 28.9 6.6 4.9 1.7

1 Unit..................................................................... 14.5 4.1 2.9 1.2

2 Units................................................................... 9.1 1.8 1.4 0.3

3 or More Units...................................................... 5.4 0.7 0.5 Q

Central Air-Conditioning Usage

Air-Conditioned Floorspace (Square Feet)

None...................................................................... 45.2 8.3 6.4 1.9

1 to 499.................................................................. 3.9 0.8 0.5 0.3

500 to 999.............................................................. 15.0 3.0 2.0 1.0

1,000 to 1,499........................................................ 15.6 3.9 2.7 1.2

1,500 to 1,999........................................................ 11.1 2.4 1.7 0.7

2,000 to 2,499........................................................ 7.0 2.3 1.5 0.8

2,500 to 2,999........................................................ 5.2 1.7 1.1 0.6

3,000 or 3,499........................................................ 2.7 1.1 0.5 0.6

3,500 to 3,999........................................................ 1.8 0.8 0.5 0.3

4,000 or More........................................................ 3.5 1.4 0.9 0.4

Number of Rooms Cooled by Central

Air-Conditioning in Summer 2005

None...................................................................... 1.4 Q Q Q

1............................................................................ 0.7 Q Q N

2............................................................................ 2.1 0.4 0.3 Q

3............................................................................ 7.5 1.9 1.3 0.6

4............................................................................ 7.9 1.5 1.0 0.5

5 or More............................................................... 46.3 13.2 8.6 4.6

Proportion of Rooms Air-Conditioned

None...................................................................... 1.4 Q Q Q

Some, But Not all of the Rooms............................. 8.4 2.3 1.6 0.7

All of the Rooms.................................................... 56.1 14.9 9.7 5.2

Frequency of Central Air-Conditioner Use

Never..................................................................... 1.4 Q Q Q

Only a Few Times When Needed.......................... 11.4 3.9 2.8 1.1

Quite a Bit.............................................................. 12.6 4.5 3.1 1.4

All Summer............................................................ 40.5 8.8 5.4 3.4

Table HC12.7 Air-Conditioning Usage Indicators by Midwest Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators East North Central West North Central

Midwest Census Region

U.S.

Housing

Units

(millions)

Census Division

Total

Midwest

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC12.7 Air-Conditioning Usage Indicators by Midwest Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators East North Central West North Central

Midwest Census Region

U.S.

Housing

Units

(millions)

Census Division

Total

Midwest

At Home Behavior

Home Used for Business

Yes..................................................................... 6.4 1.7 1.0 0.7

No...................................................................... 59.5 15.6 10.3 5.3

Someone Home All Day

Yes..................................................................... 32.7 8.4 5.4 3.1

No...................................................................... 33.1 8.9 5.9 2.9

Housing Unit Characteristics Affecting Usage

Large Tree(s) that Shade the Home

Yes........................................................................ 31.6 9.3 6.0 3.2

No.......................................................................... 34.3 8.0 5.3 2.7

Adequacy of Insulation

Well Insulated........................................................ 29.5 8.2 5.3 2.9

Adequately Insulated............................................. 27.9 7.1 4.7 2.4

Poorly Insulated..................................................... 7.3 1.7 1.1 0.6

No Insulation.......................................................... 0.3 Q Q N

Don't Know............................................................ 0.9 0.3 Q Q

Home Is Too Drafty During the Winter

Never..................................................................... 42.6 10.7 6.9 3.8

Some of the Time.................................................. 16.3 4.5 3.0 1.5

Most of the Time.................................................... 2.5 0.7 0.6 Q

All of the Time........................................................ 2.2 0.7 0.5 0.3

Don't Know............................................................ 2.2 0.7 0.4 0.3

Unusually High Ceilings

Yes........................................................................ 20.3 5.1 3.4 1.7

No.......................................................................... 41.9 11.6 7.7 4.0

Not Asked (Mobile Homes).................................... 3.7 0.5 Q 0.3

Cathederal Ceilings

(In Housing Units with High Ceilings)

Yes................................................................. 13.5 3.2 2.2 1.0

No................................................................... 6.7 2.0 1.2 0.7

Type of Glass in Windows

Single-pane Glass.................................................. 27.4 4.6 2.7 2.0

Double-pane Glass

Without Low-e Coating....................................... 31.5 9.8 6.7 3.1

With Low-e Coating............................................ 5.8 2.4 1.6 0.8

Triple-pane Glass

Without Low-e Coating....................................... 0.8 0.3 Q Q

With Low-e Coating............................................ QQQQ

Proportion of Windows Replaced

All.......................................................................... 11.5 3.9 3.2 0.7

Some..................................................................... 11.1 3.7 2.6 1.1

None...................................................................... 40.9 9.3 5.3 4.0

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC12.7 Air-Conditioning Usage Indicators by Midwest Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators East North Central West North Central

Midwest Census Region

U.S.

Housing

Units

(millions)

Census Division

Total

Midwest

Thermostats

Thermostat Available During Summer

Yes........................................................................ 63.9 17.0 11.0 5.9

No.......................................................................... 1.9 0.3 0.3 Q

Do Not Use Central Air-Conditioning...................... 45.2 8.3 6.4 1.9

Use a Programmable Thermostat

Yes................................................................. 25.0 6.8 4.8 2.0

No................................................................... 38.9 10.1 6.3 3.9

Use of Programmable Thermostats

Adjusts Temperature During Day

Yes..................................................................... 15.1 3.8 2.5 1.2

No...................................................................... 9.9 3.0 2.2 0.8

Adjusts Temperature at Night

Yes..................................................................... 15.4 4.0 2.7 1.3

No...................................................................... 9.6 2.8 2.1 0.7

Do Not Use Central Air-Conditioning...................... 45.2 8.3 6.4 1.9

Summer 2005 Temperature Settings

Higher Temperature Settings

Daytime When No One is Home

Yes..................................................................... 0.5 Q Q N

No...................................................................... 50.8 12.9 8.2 4.7

Unknown............................................................ 14.5 4.4 3.1 1.2

Do Not Use Central Air-Conditioning.................. 45.2 8.3 6.4 1.9

At Night During Sleeping Hours

Yes..................................................................... 7.3 1.6 0.9 0.7

No...................................................................... 44.3 11.4 7.3 4.0

Unknown............................................................ 14.2 4.3 3.1 1.2

Do Not Use Central Air-Conditioning...................... 45.2 8.3 6.4 1.9

Daytime Setting When Someone is Home

Air Conditioner Turned On..................................... 52.0 13.0 8.2 4.8

69 Degrees or Less............................................ 4.8 1.3 0.9 0.4

70 Degrees......................................................... 7.2 1.9 1.0 0.8

71 to 73 Degrees................................................ 8.8 2.6 1.9 0.7

74 to 76 Degrees................................................ 16.5 4.2 2.8 1.4

77 to 79 Degrees................................................ 11.1 2.4 1.3 1.0

80 Degrees or More........................................... 3.7 0.6 Q 0.3

Dont Know/No Answer....................................... 1.1 0.3 Q Q

Do Not Use Central Air Conditioning...................... 45.2 8.3 6.4 1.9

Setting When No On is at Home

Air Conditioner Turned On..................................... 49.5 12.6 7.9 4.7

69 Degrees or Less............................................ 3.6 0.9 0.7 Q

70 Degrees......................................................... 5.2 1.4 0.8 0.6

71 to 73 Degrees................................................ 6.0 1.7 1.1 0.6

74 to 76 Degrees................................................ 13.8 4.1 2.7 1.4

77 to 79 Degrees................................................ 10.7 2.7 1.7 1.0

80 Degrees or More........................................... 10.2 1.8 0.8 1.0

Dont Know/No Answer....................................... 1.6 0.3 Q Q

Air-Conditioner Turned Off..................................... 2.0 0.4 0.4 Q

Do Not Use Central Air Conditioning...................... 45.2 8.3 6.4 1.9

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC12.7 Air-Conditioning Usage Indicators by Midwest Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators East North Central West North Central

Midwest Census Region

U.S.

Housing

Units

(millions)

Census Division

Total

Midwest

Setting During Seeping Hours

Air Conditioner Turned On 51.0 12.9 8.2 4.7

69 Degrees or Less............................................ 5.7 1.5 1.0 0.5

70 Degrees......................................................... 7.7 2.0 1.3 0.8

71 to 73 Degrees................................................ 8.3 2.4 1.6 0.8

74 to 76 Degrees................................................ 15.5 4.1 2.8 1.3

77 to 79 Degrees................................................ 9.7 2.1 1.1 1.0

80 Degrees or More........................................... 4.1 0.8 0.5 0.3

Dont Know/No Answer....................................... 1.3 Q Q Q

Air-Conditioner Turned Off..................................... 0.8 Q Q Q

Do Not Use Central Air Conditioning...................... 45.2 8.3 6.4 1.9

Dehumidifier Use Each Year

Use a Humidifier........................................................ 13.3 6.1 5.0 1.2

1 to 3 Months Each Year....................................... 5.1 2.5 1.9 0.5

4 to 6 Months Each Year....................................... 4.4 2.2 1.8 0.4

7 to 9 Months Each Year....................................... 0.9 0.5 0.4 Q

10 to 11 Months..................................................... Q Q Q N

Turned on All Year Long........................................ 2.6 0.8 0.7 Q

Do Not Use a Dehumidifier........................................ 97.8 19.5 12.8 6.7

Window/Wall Air Conditioners

Frequency Most Used Unit Was Used

Never..................................................................... 0.6 Q Q N

Only a Few Times When Needed.......................... 12.1 3.1 2.4 0.7

Quite a Bit.............................................................. 7.5 1.6 1.2 0.4

All Summer............................................................ 8.6 1.8 1.2 0.6

Energy Star Wall/Window (Most-Used) Unit

Yes........................................................................ 4.6 0.8 0.7 Q

No.......................................................................... 2.7 0.5 0.4 Q

Don't Know............................................................ 7.0 1.7 1.1 0.5

Unit is More Than 4 Years Old............................... 14.6 3.6 2.7 0.9

Use a Swamp Cooler (Asked Only in Arid Areas)

Yes............................................................................ 3.4 Q Q N

No............................................................................. 41.9 2.1 2.0 Q

Not Asked.................................................................. 65.8 23.4 15.6 7.8

 1. In the 2005 RECS 1.5 million housing units reported having both central and window/wall air conditioners.

 2. The number of housing units using air-conditioning includes a small, undetermined number of housing units where the fuel for central 

air-conditioning was some fuel other than electricity; these housing units were treated as if the air-condtioning fuel was electricity.

 Q = Data withheld either because the Relative Standard Error (RSE) was greater than 50 percent or fewer than 10 households were 

sampled.

 N = No cases in reporting sample.

 Notes: ● Because of rounding, data may not sum to totals. ● See Glossary for definition of terms used in these tables.

 Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 2005 

Residential Energy Consumption Survey.

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Total............................................................................. 111.1 40.7 21.7 6.9 12.1

Do Not Have Cooling Equipment............................... 17.8 1.4 0.8 0.2 0.3

Have Cooling Equipment............................................ 93.3 39.3 20.9 6.7 11.8

Use Cooling Equipment............................................. 91.4 38.9 20.7 6.6 11.7

Have Equipment But Do Not Use it............................ 1.9 0.5 Q Q Q

Type of Air-Conditioning Equipment1, 2

Central System........................................................ 65.9 32.1 17.6 5.2 9.3

Without a Heat Pump............................................. 53.5 23.2 10.9 3.8 8.4

With a Heat Pump................................................. 12.3 9.0 6.7 1.4 0.9

Window/Wall Units.................................................. 28.9 8.0 3.4 1.7 2.9

1 Unit..................................................................... 14.5 3.1 1.4 0.8 0.9

2 Units................................................................... 9.1 2.8 1.1 0.7 1.0

3 or More Units...................................................... 5.4 2.1 0.9 0.2 1.0

Central Air-Conditioning Usage

Air-Conditioned Floorspace (Square Feet)

None...................................................................... 45.2 8.6 4.1 1.7 2.8

1 to 499.................................................................. 3.9 2.0 1.1 0.3 0.7

500 to 999.............................................................. 15.0 7.7 3.7 1.2 2.8

1,000 to 1,499........................................................ 15.6 8.2 4.8 1.4 2.1

1,500 to 1,999........................................................ 11.1 5.7 3.0 1.1 1.6

2,000 to 2,499........................................................ 7.0 3.3 1.9 0.5 0.9

2,500 to 2,999........................................................ 5.2 2.1 1.3 0.3 0.5

3,000 or 3,499........................................................ 2.7 1.0 0.5 0.2 Q

3,500 to 3,999........................................................ 1.8 0.6 0.4 Q Q

4,000 or More........................................................ 3.5 1.4 0.8 Q 0.5

Number of Rooms Cooled by Central

Air-Conditioning in Summer 2005

None...................................................................... 1.4 0.4 Q Q Q

1............................................................................ 0.7 0.4 Q N Q

2............................................................................ 2.1 0.8 Q Q 0.4

3............................................................................ 7.5 3.9 2.1 0.5 1.3

4............................................................................ 7.9 4.6 2.8 0.9 0.9

5 or More............................................................... 46.3 22.0 12.0 3.5 6.5

Proportion of Rooms Air-Conditioned

None...................................................................... 1.4 0.4 Q Q Q

Some, But Not all of the Rooms............................. 8.4 3.6 1.8 0.7 1.0

All of the Rooms.................................................... 56.1 28.2 15.6 4.4 8.2

Frequency of Central Air-Conditioner Use

Never..................................................................... 1.4 0.4 Q Q Q

Only a Few Times When Needed.......................... 11.4 2.5 1.6 0.4 0.5

Quite a Bit.............................................................. 12.6 4.5 2.5 0.8 1.2

All Summer............................................................ 40.5 24.8 13.4 3.8 7.6

Table HC13.7 Air-Conditioning Usage Indicators by South Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators South Atlantic East South 

Central

West South 

Central

South Census Region

U.S.

Housing

Units

(millions)

Census Division

Total 

South

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC13.7 Air-Conditioning Usage Indicators by South Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators South Atlantic East South 

Central

West South 

Central

South Census Region

U.S.

Housing

Units

(millions)

Census Division

Total 

South

At Home Behavior

Home Used for Business

Yes..................................................................... 6.4 2.8 1.8 0.4 0.6

No...................................................................... 59.5 29.4 15.8 4.8 8.7

Someone Home All Day

Yes..................................................................... 32.7 15.1 8.1 2.6 4.4

No...................................................................... 33.1 17.0 9.5 2.6 4.9

Housing Unit Characteristics Affecting Usage

Large Tree(s) that Shade the Home

Yes........................................................................ 31.6 14.7 7.2 2.9 4.6

No.......................................................................... 34.3 17.4 10.4 2.3 4.7

Adequacy of Insulation

Well Insulated........................................................ 29.5 14.1 8.0 2.1 4.0

Adequately Insulated............................................. 27.9 13.9 7.6 2.4 3.9

Poorly Insulated..................................................... 7.3 3.6 1.7 0.6 1.3

No Insulation.......................................................... 0.3 Q Q N Q

Don't Know............................................................ 0.9 0.5 Q Q Q

Home Is Too Drafty During the Winter

Never..................................................................... 42.6 22.1 12.4 3.3 6.4

Some of the Time.................................................. 16.3 7.2 3.9 1.3 2.0

Most of the Time.................................................... 2.5 1.1 0.5 0.2 0.3

All of the Time........................................................ 2.2 0.7 Q 0.2 0.3

Don't Know............................................................ 2.2 1.0 0.5 Q 0.3

Unusually High Ceilings

Yes........................................................................ 20.3 9.1 4.3 1.3 3.5

No.......................................................................... 41.9 20.5 11.8 3.4 5.3

Not Asked (Mobile Homes).................................... 3.7 2.5 1.5 0.5 0.6

Cathederal Ceilings

(In Housing Units with High Ceilings)

Yes................................................................. 13.5 6.2 3.0 1.0 2.2

No................................................................... 6.7 2.9 1.4 0.3 1.2

Type of Glass in Windows

Single-pane Glass.................................................. 27.4 17.1 9.4 2.2 5.5

Double-pane Glass

Without Low-e Coating....................................... 31.5 13.0 6.9 2.7 3.4

With Low-e Coating............................................ 5.8 1.7 1.1 0.2 0.3

Triple-pane Glass

Without Low-e Coating....................................... 0.8 QQQQ

With Low-e Coating............................................ Q Q N Q N

Proportion of Windows Replaced

All.......................................................................... 11.5 4.1 2.9 0.6 0.6

Some..................................................................... 11.1 4.3 2.1 0.9 1.3

None...................................................................... 40.9 22.3 11.9 3.6 6.8

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC13.7 Air-Conditioning Usage Indicators by South Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators South Atlantic East South 

Central

West South 

Central

South Census Region

U.S.

Housing

Units

(millions)

Census Division

Total 

South

Thermostats

Thermostat Available During Summer

Yes........................................................................ 63.9 31.4 17.2 5.2 9.1

No.......................................................................... 1.9 0.7 0.4 Q Q

Do Not Use Central Air-Conditioning...................... 45.2 8.6 4.1 1.7 2.8

Use a Programmable Thermostat

Yes................................................................. 25.0 9.4 5.6 1.0 2.8

No................................................................... 38.9 22.0 11.6 4.1 6.3

Use of Programmable Thermostats

Adjusts Temperature During Day

Yes..................................................................... 15.1 5.7 3.5 0.5 1.8

No...................................................................... 9.9 3.7 2.1 0.6 1.0

Adjusts Temperature at Night

Yes..................................................................... 15.4 5.8 3.4 0.5 1.9

No...................................................................... 9.6 3.6 2.2 0.5 0.9

Do Not Use Central Air-Conditioning...................... 45.2 8.6 4.1 1.7 2.8

Summer 2005 Temperature Settings

Higher Temperature Settings

Daytime When No One is Home

Yes..................................................................... 0.5 0.4 Q Q Q

No...................................................................... 50.8 28.2 15.3 4.5 8.5

Unknown............................................................ 14.5 3.6 2.2 0.7 0.7

Do Not Use Central Air-Conditioning.................. 45.2 8.6 4.1 1.7 2.8

At Night During Sleeping Hours

Yes..................................................................... 7.3 4.1 2.0 0.5 1.6

No...................................................................... 44.3 24.6 13.6 4.1 7.0

Unknown............................................................ 14.2 3.4 2.0 0.7 0.7

Do Not Use Central Air-Conditioning...................... 45.2 8.6 4.1 1.7 2.8

Daytime Setting When Someone is Home

Air Conditioner Turned On..................................... 52.0 28.9 15.7 4.6 8.6

69 Degrees or Less............................................ 4.8 2.4 1.4 0.4 0.5

70 Degrees......................................................... 7.2 3.8 2.1 0.9 0.8

71 to 73 Degrees................................................ 8.8 4.3 2.0 0.9 1.4

74 to 76 Degrees................................................ 16.5 9.6 5.2 1.5 2.9

77 to 79 Degrees................................................ 11.1 6.6 3.8 0.6 2.2

80 Degrees or More........................................... 3.7 2.2 1.1 Q 0.8

Dont Know/No Answer....................................... 1.1 0.4 Q Q Q

Do Not Use Central Air Conditioning...................... 45.2 8.6 4.1 1.7 2.8

Setting When No On is at Home

Air Conditioner Turned On..................................... 49.5 28.0 15.3 4.4 8.3

69 Degrees or Less............................................ 3.6 1.9 1.2 0.3 0.5

70 Degrees......................................................... 5.2 2.8 1.6 0.6 0.6

71 to 73 Degrees................................................ 6.0 3.1 1.4 0.8 1.0

74 to 76 Degrees................................................ 13.8 7.5 4.1 1.5 2.0

77 to 79 Degrees................................................ 10.7 6.4 3.5 0.6 2.2

80 Degrees or More........................................... 10.2 6.3 3.5 0.7 2.1

Dont Know/No Answer....................................... 1.6 0.6 0.4 Q Q

Air-Conditioner Turned Off..................................... 2.0 0.6 Q Q 0.3

Do Not Use Central Air Conditioning...................... 45.2 8.6 4.1 1.7 2.8

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC13.7 Air-Conditioning Usage Indicators by South Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators South Atlantic East South 

Central

West South 

Central

South Census Region

U.S.

Housing

Units

(millions)

Census Division

Total 

South

 Setting During Seeping Hours

Air Conditioner Turned On 51.0 28.7 15.6 4.5 8.6

69 Degrees or Less............................................ 5.7 3.0 1.7 0.6 0.7

70 Degrees......................................................... 7.7 4.1 2.2 0.8 1.2

71 to 73 Degrees................................................ 8.3 4.3 1.9 0.9 1.4

74 to 76 Degrees................................................ 15.5 9.0 5.1 1.4 2.5

77 to 79 Degrees................................................ 9.7 5.9 3.5 0.5 1.9

80 Degrees or More........................................... 4.1 2.3 1.2 0.3 0.9

Dont Know/No Answer....................................... 1.3 0.5 Q Q Q

Air-Conditioner Turned Off..................................... 0.8 Q Q Q N

Do Not Use Central Air Conditioning...................... 45.2 8.6 4.1 1.7 2.8

Dehumidifier Use Each Year

Use a Humidifier........................................................ 13.3 2.7 1.9 0.5 0.3

1 to 3 Months Each Year....................................... 5.1 0.8 0.5 0.2 Q

4 to 6 Months Each Year....................................... 4.4 0.7 0.5 Q N

7 to 9 Months Each Year....................................... 0.9 0.3 Q Q Q

10 to 11 Months..................................................... Q Q Q Q N

Turned on All Year Long........................................ 2.6 0.8 0.7 Q Q

Do Not Use a Dehumidifier........................................ 97.8 38.0 19.8 6.4 11.8

Window/Wall Air Conditioners

Frequency Most Used Unit Was Used

Never..................................................................... 0.6 QQQQ

Only a Few Times When Needed.......................... 12.1 2.1 1.0 0.5 0.6

Quite a Bit.............................................................. 7.5 2.2 1.1 0.5 0.6

All Summer............................................................ 8.6 3.6 1.2 0.8 1.5

Energy Star Wall/Window (Most-Used) Unit

Yes........................................................................ 4.6 1.2 0.5 Q 0.6

No.......................................................................... 2.7 1.0 0.5 Q 0.3

Don't Know............................................................ 7.0 1.7 0.8 0.3 0.6

Unit is More Than 4 Years Old............................... 14.6 4.1 1.6 1.2 1.4

Use a Swamp Cooler (Asked Only in Arid Areas)

Yes............................................................................ 3.4 Q N N Q

No............................................................................. 41.9 19.6 5.8 1.9 12.0

Not Asked.................................................................. 65.8 21.1 15.9 5.0 Q

 1. In the 2005 RECS 1.5 million housing units reported having both central and window/wall air conditioners.

 2. The number of housing units using air-conditioning includes a small, undetermined number of housing units where the fuel for 

central air-conditioning was some fuel other than electricity; these housing units were treated as if the air-condtioning fuel was 

electricity.

 Q = Data withheld either because the Relative Standard Error (RSE) was greater than 50 percent or fewer than 10 households

were sampled.

 N = No cases in reporting sample.

 Notes: ● Because of rounding, data may not sum to totals. ● See Glossary for definition of terms used in these tables.

 Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 2005 

Residential Energy Consumption Survey.

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Total............................................................................. 111.1 24.2 7.6 16.6

Do Not Have Cooling Equipment............................... 17.8 10.3 3.1 7.3

Have Cooling Equipment............................................ 93.3 13.9 4.5 9.4

Use Cooling Equipment............................................. 91.4 12.9 4.3 8.5

Have Equipment But Do Not Use it............................ 1.9 1.0 Q 0.8

Type of Air-Conditioning Equipment1, 2

Central System........................................................ 65.9 10.5 3.9 6.5

Without a Heat Pump............................................. 53.5 8.7 3.2 5.5

With a Heat Pump................................................. 12.3 1.7 0.7 1.0

Window/Wall Units.................................................. 28.9 3.6 0.6 3.0

1 Unit..................................................................... 14.5 2.9 0.5 2.4

2 Units................................................................... 9.1 0.4 Q 0.4

3 or More Units...................................................... 5.4 0.3 Q Q

Central Air-Conditioning Usage

Air-Conditioned Floorspace (Square Feet)

None...................................................................... 45.2 13.7 3.6 10.1

1 to 499.................................................................. 3.9 1.0 0.3 0.6

500 to 999.............................................................. 15.0 3.2 1.1 2.1

1,000 to 1,499........................................................ 15.6 2.3 0.7 1.6

1,500 to 1,999........................................................ 11.1 1.7 0.9 0.8

2,000 to 2,499........................................................ 7.0 0.8 0.2 0.6

2,500 to 2,999........................................................ 5.2 0.8 0.4 0.4

3,000 or 3,499........................................................ 2.7 Q Q Q

3,500 to 3,999........................................................ 1.8 Q Q Q

4,000 or More........................................................ 3.5 0.3 Q Q

Number of Rooms Cooled by Central

Air-Conditioning in Summer 2005

None...................................................................... 1.4 0.8 Q 0.7

1............................................................................ 0.7 Q Q Q

2............................................................................ 2.1 0.6 Q 0.4

3............................................................................ 7.5 1.4 0.6 0.8

4............................................................................ 7.9 1.0 0.5 0.5

5 or More............................................................... 46.3 6.7 2.5 4.1

Proportion of Rooms Air-Conditioned

None...................................................................... 1.4 0.8 Q 0.7

Some, But Not all of the Rooms............................. 8.4 1.9 0.8 1.0

All of the Rooms.................................................... 56.1 7.8 3.0 4.8

Frequency of Central Air-Conditioner Use

Never..................................................................... 1.4 0.8 Q 0.7

Only a Few Times When Needed.......................... 11.4 3.4 0.7 2.7

Quite a Bit.............................................................. 12.6 2.4 0.8 1.6

All Summer............................................................ 40.5 3.9 2.4 1.5

Table HC14.7 Air-Conditioning Usage Indicators by West Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators Mountain Pacific

West Census Region

U.S.

Housing

Units

(millions)

Census Division

Total

West

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC14.7 Air-Conditioning Usage Indicators by West Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators Mountain Pacific

West Census Region

U.S.

Housing

Units

(millions)

Census Division

Total

West

At Home Behavior

Home Used for Business

Yes..................................................................... 6.4 1.4 0.6 0.8

No...................................................................... 59.5 9.1 3.3 5.8

Someone Home All Day

Yes..................................................................... 32.7 5.7 2.1 3.6

No...................................................................... 33.1 4.8 1.9 3.0

Housing Unit Characteristics Affecting Usage

Large Tree(s) that Shade the Home

Yes........................................................................ 31.6 4.6 1.6 3.0

No.......................................................................... 34.3 5.8 2.3 3.5

Adequacy of Insulation

Well Insulated........................................................ 29.5 4.4 1.7 2.7

Adequately Insulated............................................. 27.9 4.6 1.7 2.9

Poorly Insulated..................................................... 7.3 1.1 0.5 0.7

No Insulation.......................................................... 0.3 Q Q Q

Don't Know............................................................ 0.9 Q N Q

Home Is Too Drafty During the Winter

Never..................................................................... 42.6 6.4 2.3 4.1

Some of the Time.................................................. 16.3 2.9 1.1 1.8

Most of the Time.................................................... 2.5 0.4 Q 0.2

All of the Time........................................................ 2.2 0.4 Q 0.3

Don't Know............................................................ 2.2 0.4 0.2 Q

Unusually High Ceilings

Yes........................................................................ 20.3 4.4 1.8 2.6

No.......................................................................... 41.9 5.5 1.9 3.6

Not Asked (Mobile Homes).................................... 3.7 0.6 0.2 0.3

Cathederal Ceilings

(In Housing Units with High Ceilings)

Yes................................................................. 13.5 3.1 1.3 1.8

No................................................................... 6.7 1.3 0.5 0.8

Type of Glass in Windows

Single-pane Glass.................................................. 27.4 4.4 1.4 3.0

Double-pane Glass

Without Low-e Coating....................................... 31.5 4.8 1.8 3.0

With Low-e Coating............................................ 5.8 1.1 0.6 0.5

Triple-pane Glass

Without Low-e Coating....................................... 0.8 Q Q Q

With Low-e Coating............................................ QQQQ

Proportion of Windows Replaced

All.......................................................................... 11.5 1.5 0.3 1.2

Some..................................................................... 11.1 2.0 0.7 1.3

None...................................................................... 40.9 6.6 2.8 3.8

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC14.7 Air-Conditioning Usage Indicators by West Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators Mountain Pacific

West Census Region

U.S.

Housing

Units

(millions)

Census Division

Total

West

Thermostats

Thermostat Available During Summer

Yes........................................................................ 63.9 10.1 3.7 6.4

No.......................................................................... 1.9 0.4 Q Q

Do Not Use Central Air-Conditioning...................... 45.2 13.7 3.6 10.1

Use a Programmable Thermostat

Yes................................................................. 25.0 6.0 1.9 4.2

No................................................................... 38.9 4.1 1.9 2.2

Use of Programmable Thermostats

Adjusts Temperature During Day

Yes..................................................................... 15.1 3.5 1.2 2.4

No...................................................................... 9.9 2.5 0.7 1.8

Adjusts Temperature at Night

Yes..................................................................... 15.4 3.5 1.2 2.4

No...................................................................... 9.6 2.5 0.7 1.8

Do Not Use Central Air-Conditioning...................... 45.2 13.7 3.6 10.1

Summer 2005 Temperature Settings

Higher Temperature Settings

Daytime When No One is Home

Yes..................................................................... 0.5 N N N

No...................................................................... 50.8 5.7 3.0 2.7

Unknown............................................................ 14.5 4.8 0.9 3.8

Do Not Use Central Air-Conditioning.................. 45.2 13.7 3.6 10.1

At Night During Sleeping Hours

Yes..................................................................... 7.3 0.9 0.6 0.3

No...................................................................... 44.3 4.9 2.5 2.5

Unknown............................................................ 14.2 4.7 0.9 3.8

Do Not Use Central Air-Conditioning...................... 45.2 13.7 3.6 10.1

Daytime Setting When Someone is Home

Air Conditioner Turned On..................................... 52.0 6.0 3.1 3.0

69 Degrees or Less............................................ 4.8 0.4 Q Q

70 Degrees......................................................... 7.2 0.7 0.3 0.4

71 to 73 Degrees................................................ 8.8 0.9 0.4 0.6

74 to 76 Degrees................................................ 16.5 1.6 0.8 0.8

77 to 79 Degrees................................................ 11.1 1.7 0.8 0.8

80 Degrees or More........................................... 3.7 0.8 0.5 0.2

Dont Know/No Answer....................................... 1.1 0.3 Q Q

Do Not Use Central Air Conditioning...................... 45.2 13.7 3.6 10.1

Setting When No On is at Home

Air Conditioner Turned On..................................... 49.5 4.9 2.7 2.2

69 Degrees or Less............................................ 3.6 Q Q Q

70 Degrees......................................................... 5.2 0.4 Q Q

71 to 73 Degrees................................................ 6.0 0.5 Q 0.3

74 to 76 Degrees................................................ 13.8 1.1 0.6 0.4

77 to 79 Degrees................................................ 10.7 1.0 0.6 0.4

80 Degrees or More........................................... 10.2 1.8 1.0 0.8

Dont Know/No Answer....................................... 1.6 0.5 Q 0.4

Air-Conditioner Turned Off..................................... 2.0 0.8 0.3 0.5

Do Not Use Central Air Conditioning...................... 45.2 13.7 3.6 10.1

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC14.7 Air-Conditioning Usage Indicators by West Census Region, 2005

 Million U.S. Housing Units

Air Conditioning Usage Indicators Mountain Pacific

West Census Region

U.S.

Housing

Units

(millions)

Census Division

Total

West

Setting During Seeping Hours

Air Conditioner Turned On 51.0 5.3 2.8 2.5

69 Degrees or Less............................................ 5.7 0.5 Q 0.3

70 Degrees......................................................... 7.7 0.5 0.2 0.3

71 to 73 Degrees................................................ 8.3 0.8 0.4 0.4

74 to 76 Degrees................................................ 15.5 1.4 0.8 0.6

77 to 79 Degrees................................................ 9.7 1.3 0.8 0.5

80 Degrees or More........................................... 4.1 0.8 0.4 0.4

Dont Know/No Answer....................................... 1.3 0.5 Q 0.3

Air-Conditioner Turned Off..................................... 0.8 0.5 Q 0.3

Do Not Use Central Air Conditioning...................... 45.2 13.7 3.6 10.1

Dehumidifier Use Each Year

Use a Humidifier........................................................ 13.3 0.3 Q 0.3

1 to 3 Months Each Year....................................... 5.1 Q Q Q

4 to 6 Months Each Year....................................... 4.4 Q Q Q

7 to 9 Months Each Year....................................... 0.9 Q N Q

10 to 11 Months..................................................... Q Q N Q

Turned on All Year Long........................................ 2.6 Q Q Q

Do Not Use a Dehumidifier........................................ 97.8 23.9 7.5 16.3

Window/Wall Air Conditioners

Frequency Most Used Unit Was Used

Never..................................................................... 0.6 Q Q Q

Only a Few Times When Needed.......................... 12.1 2.0 0.2 1.8

Quite a Bit.............................................................. 7.5 0.7 0.2 0.6

All Summer............................................................ 8.6 0.7 Q 0.5

Energy Star Wall/Window (Most-Used) Unit

Yes........................................................................ 4.6 0.5 Q 0.4

No.......................................................................... 2.7 0.3 Q 0.2

Don't Know............................................................ 7.0 1.1 Q 0.9

Unit is More Than 4 Years Old............................... 14.6 1.8 0.3 1.5

Use a Swamp Cooler (Asked Only in Arid Areas)

Yes............................................................................ 3.4 3.3 2.1 1.1

No............................................................................. 41.9 20.1 5.4 14.7

Not Asked.................................................................. 65.8 0.8 Q 0.8

 1. In the 2005 RECS 1.5 million housing units reported having both central and window/wall air conditioners.

 2. The number of housing units using air-conditioning includes a small, undetermined number of housing units where the fuel for central 

air-conditioning was some fuel other than electricity; these housing units were treated as if the air-condtioning fuel was electricity.

 Q = Data withheld either because the Relative Standard Error (RSE) was greater than 50 percent or fewer than 10 households were 

sampled.

 N = No cases in reporting sample.

 Notes: ● Because of rounding, data may not sum to totals. ● See Glossary for definition of terms used in these tables.

 Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 2005 

Residential Energy Consumption Survey.

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC15.7 Air-Conditioning Usage Indicators by Four Most Populated States, 2005

Total.................................................................................. 111.1 7.1 7.0 8.0 12.1

Do Not Have Cooling Equipment.................................... 17.8 1.8 Q Q 4.9

Have Cooling Equipment................................................. 93.3 5.3 7.0 7.8 7.2

Use Cooling Equipment.................................................. 91.4 5.3 7.0 7.7 6.6

Have Equipment But Do Not Use it................................ 1.9 Q N Q 0.6

Type of Air-Conditioning Equipment1, 2

Central System............................................................. 65.9 1.1 6.4 6.4 5.4

Without a Heat Pump................................................. 53.5 1.1 3.5 5.7 4.9

With a Heat Pump...................................................... 12.3 Q 2.9 0.7 0.5

Window/Wall Units....................................................... 28.9 4.2 0.5 1.6 1.9

1 Unit.......................................................................... 14.5 1.8 Q 0.6 1.5

2 Units........................................................................ 9.1 1.7 Q 0.6 Q

3 or More Units........................................................... 5.4 0.7 Q 0.5 Q

Central Air-Conditioning Usage

Air-Conditioned Floorspace (Square Feet)

None........................................................................... 45.2 6.0 0.6 1.6 6.7

1 to 499...................................................................... 3.9 Q 0.5 0.5 0.5

500 to 999................................................................... 15.0 Q 1.4 1.8 1.8

1,000 to 1,499............................................................. 15.6 Q 2.0 1.1 1.3

1,500 to 1,999............................................................. 11.1 Q 1.3 1.2 0.7

2,000 to 2,499............................................................. 7.0 Q 0.5 0.7 0.5

2,500 to 2,999............................................................. 5.2 Q Q 0.4 0.3

3,000 or 3,499............................................................ 2.7 QQQQ

3,500 to 3,999............................................................. 1.8 QQQQ

4,000 or More............................................................. 3.5 Q Q 0.5 Q

Number of Rooms Cooled by Central

Air-Conditioning in Summer 2005

None........................................................................... 1.4 Q N Q 0.5

1................................................................................. 0.7 N Q Q Q

2................................................................................. 2.1 Q Q Q 0.4

3................................................................................. 7.5 Q 0.7 1.0 0.8

4................................................................................. 7.9 Q 1.4 0.5 0.4

5 or More.................................................................... 46.3 0.8 4.2 4.5 3.4

Proportion of Rooms Air-Conditioned

None........................................................................... 1.4 Q N Q 0.5

Some, But Not All of the Rooms................................. 8.4 Q 0.5 0.8 0.9

All of the Rooms......................................................... 56.1 0.9 5.9 5.5 4.0

Frequency of Central Air-Conditioner Use

Never.......................................................................... 1.4 Q N Q 0.5

Only a Few Times When Needed............................... 11.4 0.4 Q Q 2.4

Quite a Bit................................................................... 12.6 0.3 0.5 0.9 1.3

All Summer................................................................. 40.5 0.4 5.7 5.2 1.2

Housing

Units 

(millions)

 Million U.S. Housing Units

Air Conditioning Usage Indicators

Four Most Populated States

New York Florida Texas California

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC15.7 Air-Conditioning Usage Indicators by Four Most Populated States, 2005

Housing

Units 

(millions)

 Million U.S. Housing Units

Air Conditioning Usage Indicators

Four Most Populated States

New York Florida Texas California

At Home Behavior

Home Used for Business

Yes......................................................................... 6.4 Q 0.7 0.4 0.6

No........................................................................... 59.5 1.0 5.8 6.0 4.9

Someone Home All Day

Yes......................................................................... 32.7 0.7 3.3 3.1 3.1

No........................................................................... 33.1 0.4 3.1 3.3 2.3

Housing Unit Characteristics Affecting Usage

Large Tree(s) that Shade the Home

Yes............................................................................. 31.6 0.5 2.1 3.0 2.5

No............................................................................... 34.3 0.7 4.3 3.4 2.9

Adequacy of Insulation

Well Insulated............................................................. 29.5 0.7 2.5 2.7 2.1

Adequately Insulated.................................................. 27.9 0.4 3.0 2.7 2.5

Poorly Insulated.......................................................... 7.3 Q 0.7 0.9 0.6

No Insulation............................................................... 0.3 N Q Q Q

Don't Know................................................................. 0.9 N Q Q Q

Home Is Too Drafty During the Winter

Never.......................................................................... 42.6 0.7 5.2 4.6 3.3

Some of the Time....................................................... 16.3 0.4 0.8 1.3 1.6

Most of the Time......................................................... 2.5 QQQQ

All of the Time............................................................ 2.2 Q Q Q 0.3

Don't Know................................................................. 2.2 N Q Q Q

Unusually High Ceilings

Yes............................................................................. 20.3 0.3 1.3 3.0 2.2

No............................................................................... 41.9 0.8 4.7 3.3 3.1

Not Asked (Mobile Homes)......................................... 3.7 N Q Q Q

Cathederal Ceilings

(In Housing Units with High Ceilings)

Yes...................................................................... 13.5 Q 1.0 1.9 1.4

No....................................................................... 6.7 Q Q 1.0 0.8

Type of Glass in Windows

Single-pane Glass...................................................... 27.4 Q 4.9 3.6 2.8

Double-pane Glass

Without Low-e Coating............................................ 31.5 0.6 1.3 2.5 2.2

With Low-e Coating................................................. 5.8 Q Q Q 0.3

Triple-pane Glass

Without Low-e Coating............................................ 0.8 Q N Q Q

With Low-e Coating................................................. Q N N N Q

Proportion of Windows Replaced

All............................................................................... 11.5 0.3 0.9 0.3 1.0

Some.......................................................................... 11.1 0.3 0.6 0.9 1.1

None........................................................................... 40.9 0.5 4.6 4.6 3.1

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC15.7 Air-Conditioning Usage Indicators by Four Most Populated States, 2005

Housing

Units 

(millions)

 Million U.S. Housing Units

Air Conditioning Usage Indicators

Four Most Populated States

New York Florida Texas California

Thermostats

Thermostat Available During Summer

Yes............................................................................. 63.9 1.1 6.2 6.2 5.3

No............................................................................... 1.9 QQQQ

Do Not Use Central Air-Conditioning........................... 45.2 6.0 0.6 1.6 6.7

Use a Programmable Thermostat

Yes...................................................................... 25.0 0.8 1.9 2.3 3.6

No....................................................................... 38.9 Q 4.3 3.9 1.7

Use of Programmable Thermostats

Adjusts Temperature During Day

Yes......................................................................... 15.1 0.6 1.1 1.6 2.0

No........................................................................... 9.9 Q 0.8 0.7 1.6

Adjusts Temperature at Night

Yes......................................................................... 15.4 0.6 1.0 1.7 2.0

No........................................................................... 9.6 Q 0.9 0.6 1.6

Do Not Use Central Air-Conditioning........................... 45.2 6.0 0.6 1.6 6.7

Summer 2005 Temperature Settings

Higher Temperature Settings

Daytime When No One is Home

Yes......................................................................... 0.5 Q Q Q N

No........................................................................... 50.8 0.7 6.0 5.9 2.2

Unknown................................................................. 14.5 0.4 Q 0.4 3.2

Do Not Use Central Air-Conditioning....................... 45.2 6.0 0.6 1.6 6.7

At Night During Sleeping Hours

Yes......................................................................... 7.3 Q 0.8 1.1 0.3

No........................................................................... 44.3 0.7 5.3 4.9 1.9

Unknown................................................................. 14.2 0.4 Q 0.4 3.2

Do Not Use Central Air-Conditioning........................... 45.2 6.0 0.6 1.6 6.7

Daytime Setting When Someone is Home

Air Conditioner Turned On.......................................... 52.0 0.7 6.1 6.0 2.4

69 Degrees or Less................................................. 4.8 QQQQ

70 Degrees............................................................. 7.2 Q 0.7 0.4 0.3

71 to 73 Degrees..................................................... 8.8 Q 0.5 0.9 0.5

74 to 76 Degrees..................................................... 16.5 Q 2.0 2.1 0.6

77 to 79 Degrees..................................................... 11.1 N 2.1 1.7 0.7

80 Degrees or More................................................ 3.7 Q 0.7 0.7 Q

Dont Know/No Answer............................................ 1.1 QQQQ

Do Not Use Central Air Conditioning........................... 45.2 6.0 0.6 1.6 6.7

Setting When No One is at Home

Air Conditioner Turned On.......................................... 49.5 0.6 6.0 5.8 1.7

69 Degrees or Less................................................. 3.6 QQQQ

70 Degrees............................................................. 5.2 Q 0.4 Q Q

71 to 73 Degrees..................................................... 6.0 Q 0.4 0.6 Q

74 to 76 Degrees..................................................... 13.8 Q 1.3 1.2 0.2

77 to 79 Degrees..................................................... 10.7 Q 1.8 1.7 0.3

80 Degrees or More................................................ 10.2 Q 1.9 1.8 0.6

Dont Know/No Answer............................................ 1.6 Q Q Q 0.4

Air-Conditioner Turned Off.......................................... 2.0 Q Q Q 0.5

Do Not Use Central Air Conditioning........................... 45.2 6.0 0.6 1.6 6.7

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC15.7 Air-Conditioning Usage Indicators by Four Most Populated States, 2005

Housing

Units 

(millions)

 Million U.S. Housing Units

Air Conditioning Usage Indicators

Four Most Populated States

New York Florida Texas California

Setting During Seeping Hours

Air Conditioner Turned On 51.0 0.7 6.1 6.0 1.9

69 Degrees or Less................................................. 5.7 Q Q 0.3 Q

70 Degrees............................................................. 7.7 Q 0.6 0.5 0.3

71 to 73 Degrees..................................................... 8.3 Q 0.7 1.0 0.3

74 to 76 Degrees..................................................... 15.5 Q 2.0 2.0 0.4

77 to 79 Degrees..................................................... 9.7 N 1.9 1.4 0.4

80 Degrees or More................................................ 4.1 Q 0.8 0.7 0.3

Dont Know/No Answer............................................ 1.3 Q Q Q 0.3

Air-Conditioner Turned Off.......................................... 0.8 Q N N 0.3

Do Not Use Central Air Conditioning........................... 45.2 6.0 0.6 1.6 6.7

Dehumidifier Use Each Year

Use a Humidifier............................................................. 13.3 1.1 Q Q Q

1 to 3 Months Each Year............................................ 5.1 0.4 Q Q Q

4 to 6 Months Each Year............................................ 4.4 0.4 N N Q

7 to 9 Months Each Year............................................ 0.9 N N Q Q

10 to 11 Months.......................................................... Q N N N Q

Turned on All Year Long............................................. 2.6 QQQQ

Do Not Use a Dehumidifier............................................. 97.8 6.0 6.8 7.8 12.0

Window/Wall Air Conditioners

Frequency Most Used Unit Was Used

Never.......................................................................... 0.6 Q N Q Q

Only a Few Times When Needed............................... 12.1 1.9 Q 0.5 1.1

Quite a Bit................................................................... 7.5 1.2 Q Q 0.4

All Summer................................................................. 8.6 1.0 Q 0.8 0.3

Energy Star Wall/Window (Most-Used) Unit Unit

Yes............................................................................. 4.6 0.9 Q 0.3 Q

No............................................................................... 2.7 0.3 Q Q Q

Don't Know................................................................. 7.0 1.1 Q 0.3 0.6

Unit is More Than 4 Years Old.................................... 14.6 1.9 Q 0.7 1.0

Use a Swamp Cooler (Asked Only in Arid Areas)

Yes................................................................................. 3.4 N N Q 0.9

No.................................................................................. 41.9 Q N 7.9 11.1

Not Asked...................................................................... 65.8 7.1 7.0 Q Q

 1. In the 2005 RECS 1.5 million housing units reported having both central and window/wall air conditioners.

 2. The number of housing units using air-conditioning includes a small, undetermined number of housing units where the fuel for 

central air-conditioning was some fuel other than electricity; these housing units were treated as if the air-condtioning fuel was electricity.

 Q = Data withheld either because the Relative Standard Error (RSE) was greater than 50 percent or fewer than 10 households were 

sampled.

 N = No cases in reporting sample.

 Notes: ● Because of rounding, data may not sum to totals. ● See Glossary for definition of terms used in these tables.

 Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 2005 

Residential Energy Consumption Survey.

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables