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1997 Housing Characteristics Tables

Air Conditioning Tables

(Million U.S. Households; 24 pages, 78 kb)

Contents Pages

HC4-1a. Air Conditioning by Climate Zone, Million U.S. Households, 1997 2 

HC4-2a. Air Conditioning by Year of Construction, Million U.S. Households, 1997 2 

HC4-3a. Air Conditioning by Household Income, Million U.S. Households, 1997 2 

HC4-4a. Air Conditioning by Type of Housing Unit, Million U.S. Households, 1997 2 

HC4-5a. Air Conditioning by Type of Owner-Occupied Housing Unit, Million U.S. Households, 1997 2 

HC4-6a. Air Conditioning by Type of Rented Housing Unit, Million U.S. Households, 1997 2 

HC4-7a. Air Conditioning by Four Most Populated States, Million U.S. Households, 1997 2 

HC4-8a. Air Conditioning by Urban/Rural Location, Million U.S. Households, 1997 2 

HC4-9a. Air Conditioning by Northeast Census Region, Million U.S. Households, 1997 2 

HC4-10a. Air Conditioning by Midwest Census Region, Million U.S. Households, 1997 2 

HC4-11a. Air Conditioning by South Census Region, Million U.S. Households, 1997 2 

HC4-12a. Air Conditioning by West Census Region, Million U.S. Households, 1997 2

These data are from the 1997 Residential Energy Consumption Survey (RECS) which provides information on the use of

energy in residential housing units in the United States. The RECS is a national statistical survey that collects data for

occupied primary housing units. RECS was first conducted in 1978; the sixth and most recent survey was conducted in

1997 RECS. The data were collected from a sample of 5,900 housing units statistically selected to represent the 101.5

million units in the United States. The 1997 data are available for the four Census regions, the nine Census divisions,

and for the four most populous States--California, Florida, New York, and Texas.

Data provided here are in the public domain and may be reproduced without permission. Appropriate credit would be

appreciated. A suggested citation is “U.S. Department of Energy, Energy Information Administration, “A Look at

Residential Energy Consumption in 1997.”

Electronic Products and Services

Users can view and download selected pages or entire reports, search for information, download data and analysis

applications, and find out about new information products and services.

Contact: Robert Latta, Survey Manager (rlatta@eia.doe.gov)

World Wide Web: http://www.eia.doe.gov/emeu/consumption 
Table HC4-1a. Air Conditioning by Climate Zone, 

 Million U.S. Households, 1997

Air Conditioning

Characteristics

RSE Column Factor:

Total

Climate Zone1

RSE

Row

Factors

Fewer than 2,000 CDD and --

2,000 CDD

or More

and Fewer

than

4,000 HDD

More than

7,000 HDD

5,500 to

7,000 HDD

4,000 to

5,499 HDD

Fewer than

4,000 HDD

0.4 2.3 1.0 0.9 1.4 0.9

Total Households With

Air-Conditioning ........................... 73.6 5.3 18.6 17.8 12.2 19.7 8.3

 Central Equipment Not Used ........ 0.3 Q Q Q Q Q 54.3

 Room Air Conditioners Not Used .. 0.7 Q 0.4 Q Q Q 31.0

Households Using Electric

Air-Conditioning2 .......................... 72.6 5.2 18.2 17.6 12.0 19.6 8.4

Type of Electric Air-Conditioning

Used

 Central Air-Conditioning3 .............. 47.5 2.9 10.5 10.3 8.4 15.3 10.0

 Without a Heat Pump .................. 36.9 2.7 9.8 7.5 5.7 11.1 12.2

 With a Heat Pump ....................... 10.6 0.1 0.7 2.9 2.7 4.2 18.3

 Room Air-Conditioning .................. 25.2 2.3 7.7 7.3 3.6 4.3 11.2

 1 Unit .......................................... 14.9 1.7 5.0 3.7 2.5 2.0 12.2

 2 Units ......................................... 7.2 0.5 2.0 2.5 0.9 1.4 15.7

 3 or More Units ........................... 3.0 Q 0.8 1.1 0.2 0.9 22.5

Number of Rooms AirConditioned in Summer 1997

 One or Two ................................... 13.0 1.1 4.6 3.6 1.7 2.0 11.5

 Three ............................................ 8.2 0.5 2.0 1.8 1.4 2.5 14.0

 Four ............................................. 11.6 0.7 2.8 3.2 1.9 3.0 15.0

 Five or More .................................. 39.8 2.8 8.9 9.0 7.0 12.1 10.6

Percentage of Rooms

Air-Conditioned

 100% ............................................. 50.2 3.1 11.0 11.4 9.1 15.6 9.7

 50% to 99% .................................. 11.4 1.1 3.0 3.1 1.5 2.6 13.0

 25% to 49% .................................. 7.0 0.6 2.3 2.1 1.1 0.9 15.5

 1% to 24% .................................... 4.0 0.3 1.9 1.0 0.3 0.4 17.0

Large Tree(s) that

Shade the Home

 Yes ................................................ 35.5 2.7 8.2 8.0 6.2 10.4 11.4

 No ................................................. 37.2 2.5 10.0 9.6 5.8 9.2 10.0

Central Air-Conditioner Age

(excludes systems for more than

one housing unit)

 Less than 5 Years ......................... 13.1 0.8 3.0 3.0 2.4 4.0 13.2

 5 to 9 Years .................................. 14.1 1.0 3.0 2.8 2.7 4.5 14.7

 10 to 19 Years .............................. 12.8 0.8 2.5 2.9 2.3 4.3 14.3

 20 Years or More .......................... 3.9 0.2 1.1 1.0 0.6 1.0 20.6

 Don’t Know ................................... 2.7 Q 0.7 0.5 0.4 1.1 26.9

Central Air-Conditioning Use

 Only a Few Times ......................... 12.6 1.4 4.4 2.6 2.0 2.1 15.2

 Quite a Bit ..................................... 10.5 1.0 2.8 2.7 1.7 2.3 13.3

 All Summer ................................... 24.4 0.4 3.3 5.0 4.7 10.9 12.5

Pays for Electricity for Central

Air-Conditioning

 Yes ................................................ 46.2 2.8 10.4 10.0 8.2 14.7 10.1

 No ................................................. 1.1 Q Q 0.3 Q 0.5 43.5

See footnotes at end of table.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:33:24 PM on 11/10/99
Table HC4-1a. Air Conditioning by Climate Zone, 

 Million U.S. Households, 1997 (Continued)

Air Conditioning

Characteristics

RSE Column Factor:

Total

Climate Zone1

RSE

Row

Factors

Fewer than 2,000 CDD and --

2,000 CDD

or More

and Fewer

than

4,000 HDD

More than

7,000 HDD

5,500 to

7,000 HDD

4,000 to

5,499 HDD

Fewer than

4,000 HDD

0.4 2.3 1.0 0.9 1.4 0.9

Age of Most-Used Room Air

Conditioner

 Less than 5 Years ......................... 8.7 0.7 2.4 2.4 1.5 1.7 14.1

 5 to 9 Years .................................. 6.9 0.6 2.4 1.9 0.9 1.1 14.5

 10 or 19 Years .............................. 5.7 0.6 1.6 1.6 0.8 1.0 15.3

 20 or More Years .......................... 2.0 0.3 0.7 0.6 0.3 Q 19.0

 Don’t Know ................................... 1.9 0.1 0.7 0.6 0.2 0.3 23.5

Pays for Electricity for Room

Air-Conditioning

 Yes ................................................ 23.4 2.1 7.3 6.8 3.3 4.0 11.7

 No ................................................. 1.7 0.2 0.4 0.5 0.3 0.3 32.3

Room Air-Conditioning Use

 Only a Few Times ......................... 13.2 1.5 4.7 3.9 1.7 1.5 12.4

 Quite a Bit ..................................... 6.5 0.6 1.9 2.0 0.9 1.0 14.6

 All Summer ................................... 5.5 Q 1.1 1.4 1.0 1.8 16.5

1 One of five climatically distinct areas, determined according to the 30-year average (1961-1990) of the annual heating and cooling degree-days. For this

report, the heating or cooling degree-days are a measure of how cold or how hot a location is over a period of one year, relative to a base temperature of 65

degrees Fahrenheit. A household is assigned to a climate zone according to the 30-year average annual degree-days for an appropriate nearby weather station. 2 The number of households, where the end use is electric air-conditioning, does not include households that did not use their equipment (0.9 million). It does

include the small number of households where the fuel for central air-conditioning equipment was something other than electricity; those households were treated

as if the fuel was electricity. 3 Includes 642,000 households using room/wall air-conditioners in addition to central air-conditioning. These are excluded from the count of 25.2 million

households using only room air-conditioners.

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

Notes: • To obtain the RSE percentage for any table cell, multiply the corresponding column and row factors. • Because of rounding, data may not sum to totals.

 • See "Glossary" for definition of terms used in this report.

Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 1997 Residential Energy Consumption Survey.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:33:24 PM on 11/10/99
Table HC4-2a. Air Conditioning by Year of Construction, 

 Million U.S. Households, 1997

Air Conditioning

Characteristics

RSE Column Factor:

Total

Year of Construction

RSE

Row

Factors

1990

 to

19971

1980

to

1989

1970

to

1979

1960

to

1969

1950

to

1959

1949

or

Before

0.4 1.8 1.3 0.9 1.1 1.0 0.9

Households With Electric

Air-Conditioning Equipment ........ 73.6 8.3 14.8 14.8 10.2 8.9 16.5 4.7

 Central Equipment Not Used ........ 0.3 Q Q Q Q Q Q 43.9

 Room Air Conditioners Not Used .. 0.7 Q Q Q Q Q 0.3 29.1

Households Using Electric

Air-Conditioning2 .......................... 72.6 8.3 14.6 14.7 10.0 8.9 16.1 4.7

Type of Electric Air-Conditioning

Used

 Central Air-Conditioning3 .............. 47.5 7.5 12.9 10.8 6.5 4.6 5.2 6.2

 Without a Heat Pump .................. 36.9 5.6 9.0 8.2 5.5 3.8 4.8 7.5

 With a Heat Pump ....................... 10.6 1.9 3.9 2.6 1.0 0.8 0.3 15.2

 Room Air-Conditioning .................. 25.2 0.8 1.8 3.9 3.5 4.3 10.9 8.6

 1 Unit .......................................... 14.9 0.6 1.4 2.6 2.0 2.2 6.0 10.8

 2 Units ......................................... 7.2 Q 0.3 0.9 0.9 1.5 3.5 13.4

 3 or More Units ........................... 3.0 Q Q 0.4 0.5 0.6 1.5 19.9

Number of Rooms AirConditioned in Summer 1997

 One or Two ................................... 13.0 0.6 1.3 2.1 1.7 1.8 5.5 11.3

 Three ............................................ 8.2 0.3 1.4 2.2 1.3 0.9 2.2 13.2

 Four ............................................. 11.6 1.3 2.6 2.2 1.5 1.2 2.6 11.7

 Five or More .................................. 39.8 6.0 9.3 8.2 5.5 5.0 5.8 6.3

Percentage of Rooms

Air-Conditioned

 100% ............................................. 50.2 7.5 12.3 11.2 7.2 5.6 6.6 5.8

 50% to 99% .................................. 11.4 0.4 1.6 2.0 1.5 1.7 4.2 11.3

 25% to 49% .................................. 7.0 0.2 0.6 1.1 0.8 1.1 3.2 14.8

 1% to 24% .................................... 4.0 0.2 0.2 0.4 0.5 0.6 2.1 17.5

Large Tree(s) that

Shade the Home

 Yes ................................................ 35.5 2.2 6.7 7.4 5.6 4.8 8.8 7.1

 No ................................................. 37.2 6.1 8.0 7.3 4.4 4.1 7.3 6.9

Central Air-Conditioner Age

(excludes systems for more than

one housing unit)

 Less than 5 Years ......................... 13.1 4.7 1.5 2.4 1.6 1.3 1.7 9.8

 5 to 9 Years .................................. 14.1 2.6 5.0 2.3 1.5 1.1 1.5 11.7

 10 to 19 Years .............................. 12.8 Q 5.5 3.2 1.5 1.3 1.2 11.3

 20 Years or More .......................... 3.9 Q Q 1.5 1.3 0.6 0.5 17.1

 Don’t Know ................................... 2.7 Q 0.6 1.2 0.3 0.2 0.3 23.3

Central Air-Conditioning Use

 Only a Few Times ......................... 12.6 1.6 3.2 2.8 1.8 1.6 1.6 11.3

 Quite a Bit ..................................... 10.5 1.8 2.7 2.4 1.3 0.9 1.4 11.7

 All Summer ................................... 24.4 4.2 7.0 5.6 3.5 2.0 2.1 8.3

Pays for Electricity for Central

Air-Conditioning

 Yes ................................................ 46.2 7.4 12.5 10.5 6.2 4.6 5.1 6.3

 No ................................................. 1.1 Q 0.3 0.3 0.3 Q Q 38.3

See footnotes at end of table.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:33:31 PM on 11/10/99
Table HC4-2a. Air Conditioning by Year of Construction, 

 Million U.S. Households, 1997 (Continued)

Air Conditioning

Characteristics

RSE Column Factor:

Total

Year of Construction

RSE

Row

Factors

1990

 to

19971

1980

to

1989

1970

to

1979

1960

to

1969

1950

to

1959

1949

or

Before

0.4 1.8 1.3 0.9 1.1 1.0 0.9

Age of Most-Used Room Air

Conditioner

 Less than 5 Years ......................... 8.7 0.5 0.7 1.2 1.1 1.5 3.8 11.5

 5 to 9 Years .................................. 6.9 0.2 0.4 1.0 0.9 1.0 3.3 14.5

 10 or 19 Years .............................. 5.7 Q 0.5 0.9 0.7 1.1 2.5 14.0

 20 or More Years .......................... 2.0 Q Q 0.4 0.5 0.4 0.7 22.1

 Don’t Know ................................... 1.9 Q Q 0.4 0.3 0.4 0.6 23.7

Pays for Electricity for Room

Air-Conditioning

 Yes ................................................ 23.4 0.8 1.4 3.5 3.3 4.1 10.3 8.8

 No ................................................. 1.7 Q 0.3 0.4 Q 0.2 0.6 31.7

Room Air-Conditioning Use

 Only a Few Times ......................... 13.2 0.3 1.1 1.9 1.7 2.2 6.0 11.7

 Quite a Bit ..................................... 6.5 0.2 0.3 0.9 1.0 1.1 2.9 14.2

 All Summer ................................... 5.5 0.3 0.3 1.1 0.8 1.0 2.0 15.1

1 New construction for 1997 includes only those housing units built and occupied between January and the April-August period when the household interviews were

conducted. 2 The number of households, where the end use is electric air-conditioning, does not include households that did not use their equipment (0.9 million). It does include the

small number of households where the fuel for central air-conditioning equipment was something other than electricity; those households were treated as if the fuel was

electricity. 3 Includes 642,000 households using room/wall air-conditioners in addition to central air-conditioning. These are excluded from the count of 25.2 million households using

only room air-conditioners.

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

Notes: • To obtain the RSE percentage for any table cell, multiply the corresponding column and row factors. • Because of rounding, data may not sum to totals. • See

"Glossary" for definition of terms used in this report.

Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 1997 Residential Energy Consumption Survey.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:33:31 PM on 11/10/99
Table HC4-3a. Air Conditioning by Household Income, 

 Million U.S. Households, 1997

Air Conditioning

Characteristics

RSE Column Factor:

Total

1997 Household Income

Below Poverty

Line

Eligible

for

Federal

Assistance1

RSE

Row

Factors

Less

than

$10,000

$10,000

to

$24,999

$25,000

to

$49,999

$50,000

or

More

0.6 1.5 1.0 0.9 1.1 1.4 1.0

Households With Electric

Air-Conditioning Equipment ........ 73.6 8.2 19.6 23.4 22.4 8.4 21.3 3.6

 Central Equipment Not Used ........ 0.3 Q Q Q Q Q Q 35.0

 Room Air Conditioners Not Used .. 0.7 Q 0.2 0.2 0.2 Q 0.3 30.0

Households Using Electric

Air-Conditioning2 .......................... 72.6 8.1 19.3 23.1 22.2 8.3 20.9 3.6

Type of Electric Air-Conditioning

Used

 Central Air-Conditioning3 .............. 47.5 3.6 10.9 15.6 17.3 3.7 10.5 5.4

 Without a Heat Pump .................. 36.9 2.8 8.4 12.5 13.3 2.8 8.0 6.7

 With a Heat Pump ....................... 10.6 0.9 2.5 3.2 4.1 0.8 2.5 12.5

 Room Air-Conditioning .................. 25.2 4.4 8.4 7.5 4.9 4.6 10.4 5.7

 1 Unit .......................................... 14.9 3.3 5.5 4.0 2.2 3.4 6.9 7.0

 2 Units ......................................... 7.2 1.0 2.1 2.6 1.5 1.1 2.7 10.2

 3 or More Units ........................... 3.0 Q 0.8 0.9 1.2 0.2 0.8 18.7

Number of Rooms AirConditioned in Summer 1997

 One or Two ................................... 13.0 2.8 4.3 3.3 2.6 2.7 5.5 7.6

 Three ............................................ 8.2 1.6 2.8 2.7 1.1 1.5 3.4 9.2

 Four ............................................. 11.6 1.5 3.9 4.2 2.0 1.5 4.0 8.8

 Five or More .................................. 39.8 2.2 8.2 12.9 16.5 2.6 8.0 5.8

Percentage of Rooms

Air-Conditioned

 100% ............................................. 50.2 4.9 12.7 16.3 16.4 4.7 13.1 4.8

 50% to 99% .................................. 11.4 1.5 3.3 3.6 3.0 1.8 3.8 7.9

 25% to 49% .................................. 7.0 1.3 2.1 1.9 1.6 1.2 2.7 11.0

 1% to 24% .................................... 4.0 0.4 1.1 1.3 1.2 0.6 1.2 13.0

Large Tree(s) that

Shade the Home

 Yes ................................................ 35.5 3.1 9.1 11.8 11.5 3.3 8.7 5.9

 No ................................................. 37.2 5.0 10.2 11.3 10.7 5.0 12.1 5.7

Central Air-Conditioner Age

(excludes systems for more than

one housing unit)

 Less than 5 Years ......................... 13.1 1.0 2.8 4.5 4.9 1.0 2.9 9.1

 5 to 9 Years .................................. 14.1 0.8 3.1 4.3 5.9 0.9 2.7 11.0

 10 to 19 Years .............................. 12.8 1.0 2.9 4.2 4.6 0.9 2.7 9.7

 20 Years or More .......................... 3.9 0.3 1.1 1.4 1.2 0.3 1.0 16.7

 Don’t Know ................................... 2.7 0.4 0.7 1.1 0.6 0.4 0.8 19.9

Central Air-Conditioning Use

 Only a Few Times ......................... 12.6 1.2 2.8 4.4 4.2 1.1 3.0 10.3

 Quite a Bit ..................................... 10.5 0.8 2.0 3.5 4.2 0.8 2.1 10.2

 All Summer ................................... 24.4 1.7 6.0 7.8 9.0 1.8 5.4 7.4

Pays for Electricity for Central

Air-Conditioning

 Yes ................................................ 46.2 3.4 10.3 15.4 17.1 3.4 9.8 5.5

 No ................................................. 1.1 0.2 0.4 0.3 Q Q 0.5 31.5

See footnotes at end of table.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:33:38 PM on 11/10/99
Table HC4-3a. Air Conditioning by Household Income, 

 Million U.S. Households, 1997 (Continued)

Air Conditioning

Characteristics

RSE Column Factor:

Total

1997 Household Income

Below Poverty

Line

Eligible

for

Federal

Assistance1

RSE

Row

Factors

Less

than

$10,000

$10,000

to

$24,999

$25,000

to

$49,999

$50,000

or

More

0.6 1.5 1.0 0.9 1.1 1.4 1.0

Age of Most-Used Room Air

Conditioner

 Less than 5 Years ......................... 8.7 1.7 2.5 2.8 1.7 1.7 3.6 9.1

 5 to 9 Years .................................. 6.9 1.0 2.2 2.1 1.6 1.1 2.6 10.4

 10 or 19 Years .............................. 5.7 0.9 2.3 1.4 1.1 1.0 2.4 10.1

 20 or More Years .......................... 2.0 0.3 0.7 0.7 0.3 0.3 0.8 16.4

 Don’t Know ................................... 1.9 0.5 0.6 0.5 0.3 0.5 1.0 18.0

Pays for Electricity for Room

Air-Conditioning

 Yes ................................................ 23.4 3.7 7.8 7.2 4.8 3.9 9.4 6.0

 No ................................................. 1.7 0.8 0.6 0.3 Q 0.7 1.0 22.5

Room Air-Conditioning Use

 Only a Few Times ......................... 13.2 2.3 4.7 3.9 2.4 2.4 5.5 7.6

 Quite a Bit ..................................... 6.5 0.9 1.8 2.4 1.3 1.0 2.2 11.0

 All Summer ................................... 5.5 1.2 1.9 1.2 1.2 1.3 2.7 10.6

1 Below 150 percent of poverty line or 60 percent of median State income. 2 The number of households, where the end use is electric air-conditioning, does not include households that did not use their equipment (0.9 million). It does include the

small number of households where the fuel for central air-conditioning equipment was something other than electricity; those households were treated as if the fuel was

electricity. 3 Includes 642,000 households using room/wall air-conditioners in addition to central air-conditioning. These are excluded from the count of 25.2 million households using

only room air-conditioners.

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

Notes: • To obtain the RSE percentage for any table cell, multiply the corresponding column and row factors. • Because of rounding, data may not sum to totals. • See

"Glossary" for definition of terms used in this report.

Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 1997 Residential Energy Consumption Survey.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:33:38 PM on 11/10/99
Table HC4-4a. Air Conditioning by Type of Housing Unit,

 Million U.S. Households, 1997

Air Conditioning

Characteristics

RSE Column Factor:

Total

Type of Housing Unit

RSE

Row

Factors

Single-Family 

Multifamily

Two to Four Units Five or More Units Mobile Home

0.4 0.6 1.8 1.3 1.7

Households With Electric

Air-Conditioning Equipment ........ 73.6 54.4 3.5 11.1 4.5 4.8

 Central Equipment Not Used ........ 0.3 0.2 Q Q Q 50.2

 Room Air Conditioners Not Used .. 0.7 0.5 Q Q Q 37.3

Households Using Electric

Air-Conditioning1 .......................... 72.6 53.8 3.4 10.9 4.5 4.8

Type of Electric Air-Conditioning

Used

 Central Air-Conditioning2 .............. 47.5 36.8 1.6 6.5 2.6 7.0

 Without a Heat Pump .................. 36.9 28.3 1.4 5.1 2.1 8.4

 With a Heat Pump ....................... 10.6 8.4 Q 1.4 0.6 17.2

 Room Air-Conditioning .................. 25.2 17.1 1.8 4.4 1.9 7.8

 1 Unit .......................................... 14.9 8.7 1.4 3.4 1.3 9.3

 2 Units ......................................... 7.2 5.6 0.4 0.8 0.4 13.4

 3 or More Units ........................... 3.0 2.7 Q Q Q 21.3

Number of Rooms AirConditioned in Summer 1997

 One or Two ................................... 13.0 7.3 1.2 3.7 0.9 9.2

 Three ............................................ 8.2 4.2 0.8 2.8 0.4 11.5

 Four ............................................. 11.6 6.0 0.8 3.4 1.5 10.5

 Five or More .................................. 39.8 36.5 0.6 1.0 1.7 8.4

Percentage of Rooms

Air-Conditioned

 100% ............................................. 50.2 37.0 2.0 8.0 3.2 6.3

 50% to 99% .................................. 11.4 9.1 0.5 1.1 0.7 11.1

 25% to 49% .................................. 7.0 4.4 0.7 1.5 0.4 13.4

 1% to 24% .................................... 4.0 3.4 0.2 0.2 Q 15.0

Large Tree(s) that

Shade the Home

 Yes ................................................ 35.5 29.6 1.0 3.0 1.9 8.3

 No ................................................. 37.2 24.3 2.5 7.9 2.6 6.9

Central Air-Conditioner Age

(excludes systems for more than

one housing unit)

 Less than 5 Years ......................... 13.1 10.7 0.3 0.9 1.2 12.0

 5 to 9 Years .................................. 14.1 11.3 0.3 1.8 0.6 14.6

 10 to 19 Years .............................. 12.8 10.5 0.4 1.4 0.5 12.7

 20 Years or More .......................... 3.9 2.9 Q 0.7 0.2 19.1

 Don’t Know ................................... 2.7 1.1 0.5 1.0 Q 19.6

Central Air-Conditioning Use

 Only a Few Times ......................... 12.6 9.6 0.4 2.0 0.6 13.2

 Quite a Bit ..................................... 10.5 8.0 0.6 1.3 0.6 12.0

 All Summer ................................... 24.4 19.2 0.6 3.2 1.5 9.3

Pays for Electricity for Central

Air-Conditioning

 Yes ................................................ 46.2 36.5 1.5 5.8 2.4 7.1

 No ................................................. 1.1 0.2 Q 0.5 Q 35.9

See footnotes at end of table.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:33:44 PM on 11/10/99
Table HC4-4a. Air Conditioning by Type of Housing Unit,

 Million U.S. Households, 1997 (Continued)

Air Conditioning

Characteristics

RSE Column Factor:

Total

Type of Housing Unit

RSE

Row

Factors

Single-Family 

Multifamily

Two to Four Units Five or More Units Mobile Home

0.4 0.6 1.8 1.3 1.7

Age of Most-Used Room Air

Conditioner

 Less than 5 Years ......................... 8.7 5.9 0.7 1.4 0.7 10.7

 5 to 9 Years .................................. 6.9 4.8 0.6 1.0 0.4 12.8

 10 or 19 Years .............................. 5.7 4.3 0.2 0.8 0.4 13.7

 20 or More Years .......................... 2.0 1.2 Q 0.5 Q 20.6

 Don’t Know ................................... 1.9 0.8 Q 0.7 0.2 20.8

Pays for Electricity for Room

Air-Conditioning

 Yes ................................................ 23.4 16.8 1.6 3.3 1.8 8.1

 No ................................................. 1.7 0.3 0.2 1.1 Q 29.1

Room Air-Conditioning Use

 Only a Few Times ......................... 13.2 8.8 1.1 2.4 0.8 10.0

 Quite a Bit ..................................... 6.5 4.5 0.4 1.1 0.4 11.7

 All Summer ................................... 5.5 3.8 0.2 0.9 0.6 13.8

1 The number of households, where the end use is electric air-conditioning, does not include households that did not use their equipment (0.9 million). It

does include the small number of households where the fuel for central air-conditioning equipment was something other than electricity; those households were

treated as if the fuel was electricity. 2 Includes 642,000 households using room/wall air-conditioners in addition to central air-conditioning. These are excluded from the count of 25.2 million

households using only room air-conditioners.

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

Notes: • To obtain the RSE percentage for any table cell, multiply the corresponding column and row factors. • Because of rounding, data may not sum to

totals. • See "Glossary" for definition of terms used in this report.

Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 1997 Residential Energy Consumption

Survey.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:33:44 PM on 11/10/99
Table HC4-5a. Air Conditioning by Type of Owner-Occupied Housing Unit, 

 Million U.S. Households, 1997

Air Conditioning

Characteristics

RSE Column Factor:

Total

OwnerOccupied

Units

Type of Owner-Occupied Housing Unit

RSE

Row

Factors

Single-Family 

Multifamily

Two to Four Units Five or More Units Mobile Home

0.5 0.5 1.7 1.3 1.6

Total ............................................... 52.5 54.4 3.5 11.1 4.5 5.2

 Central Equipment Not Used ........ 0.2 0.2 Q Q Q 47.0

 Room Air Conditioners Not Used .. 0.5 0.5 Q Q Q 38.8

Households Using Electric

Air-Conditioning1 .......................... 51.9 53.8 3.4 10.9 4.5 5.2

Type of Electric Air-Conditioning

Used

 Central Air-Conditioning2 .............. 36.1 36.8 1.6 6.5 2.6 7.3

 Without a Heat Pump .................. 28.2 28.3 1.4 5.1 2.1 8.6

 With a Heat Pump ....................... 7.9 8.4 Q 1.4 0.6 17.8

 Room Air-Conditioning .................. 15.7 17.1 1.8 4.4 1.9 8.2

 1 Unit .......................................... 7.8 8.7 1.4 3.4 1.3 9.9

 2 Units ......................................... 5.2 5.6 0.4 0.8 0.4 13.9

 3 or More Units ........................... 2.7 2.7 Q Q Q 20.2

Number of Rooms AirConditioned in Summer 1997

 One or Two ................................... 6.2 7.3 1.2 3.7 0.9 10.0

 Three ............................................ 3.9 4.2 0.8 2.8 0.4 12.5

 Four ............................................. 6.6 6.0 0.8 3.4 1.5 10.8

 Five or More .................................. 35.2 36.5 0.6 1.0 1.7 8.5

Percentage of Rooms

Air-Conditioned

 100% ............................................. 36.6 37.0 2.0 8.0 3.2 6.7

 50% to 99% .................................. 8.6 9.1 0.5 1.1 0.7 11.4

 25% to 49% .................................. 3.8 4.4 0.7 1.5 0.4 14.4

 1% to 24% .................................... 2.9 3.4 0.2 0.2 Q 15.4

Large Tree(s) that

Shade the Home

 Yes ................................................ 28.3 29.6 1.0 3.0 1.9 8.5

 No ................................................. 23.5 24.3 2.5 7.9 2.6 7.3

Central Air-Conditioner Age

(excludes systems for more than

one housing unit)

 Less than 5 Years ......................... 11.1 10.7 0.3 0.9 1.2 12.4

 5 to 9 Years .................................. 11.1 11.3 0.3 1.8 0.6 14.7

 10 to 19 Years .............................. 10.2 10.5 0.4 1.4 0.5 13.1

 20 Years or More .......................... 2.8 2.9 Q 0.7 0.2 19.0

 Don’t Know ................................... 0.7 1.1 0.5 1.0 Q 20.6

Central Air-Conditioning Use

 Only a Few Times ......................... 9.3 9.6 0.4 2.0 0.6 13.7

 Quite a Bit ..................................... 7.9 8.0 0.6 1.3 0.6 12.7

 All Summer ................................... 18.9 19.2 0.6 3.2 1.5 9.5

Pays for Electricity for Central

Air-Conditioning

 Yes ................................................ 35.8 36.5 1.5 5.8 2.4 7.4

 No ................................................. 0.3 0.2 Q 0.5 Q 40.9

See footnotes at end of table.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:33:50 PM on 11/10/99
Table HC4-5a. Air Conditioning by Type of Owner-Occupied Housing Unit, 

 Million U.S. Households, 1997 (Continued)

Air Conditioning

Characteristics

RSE Column Factor:

Total

OwnerOccupied

Units

Type of Owner-Occupied Housing Unit

RSE

Row

Factors

Single-Family 

Multifamily

Two to Four Units Five or More Units Mobile Home

0.5 0.5 1.7 1.3 1.6

Age of Most-Used Room Air

Conditioner

 Less than 5 Years ......................... 5.3 5.9 0.7 1.4 0.7 11.3

 5 to 9 Years .................................. 4.6 4.8 0.6 1.0 0.4 13.4

 10 or 19 Years .............................. 4.0 4.3 0.2 0.8 0.4 14.6

 20 or More Years .......................... 1.3 1.2 Q 0.5 Q 21.5

 Don’t Know ................................... 0.5 0.8 Q 0.7 0.2 25.1

Pays for Electricity for Room

Air-Conditioning

 Yes ................................................ 15.6 16.8 1.6 3.3 1.8 8.5

 No ................................................. Q 0.3 0.2 1.1 Q NF

Room Air-Conditioning Use

 Only a Few Times ......................... 8.2 8.8 1.1 2.4 0.8 10.7

 Quite a Bit ..................................... 4.1 4.5 0.4 1.1 0.4 12.0

 All Summer ................................... 3.5 3.8 0.2 0.9 0.6 14.8

1 The number of households where the end use is electric air-conditioning excludes households that did not use their equipment (0.9 million). It does include the

small number of households where the fuel for central air-conditioning equipment was something other than electricity; those latter households were treated as if the fuel

was electricity. 2 Includes 642,000 households using room/wall air-conditioners in addition to central air-conditioning. These are excluded from the count of 25.2 million households

using only room air-conditioners.

NF = No applicable RSE row factor.

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

Notes: • To obtain the RSE percentage for any table cell, multiply the corresponding column and row factors. • Because of rounding, data may not sum to totals. 

• See "Glossary" for definition of terms used in this report.

Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 1997 Residential Energy Consumption Survey.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:33:50 PM on 11/10/99
Table HC4-6a. Air Conditioning by Type of Rented Housing Unit, 

 Million U.S. Households, 1997

Air Conditioning

Characteristics

RSE Column Factor:

Total

Rented

Units

Type of Rented Housing Unit

RSE

Row

Factors

Single-Family 

Multifamily

Two to Four Units Five or More Units Mobile Home

0.7 0.5 1.6 1.2 1.4

Total ............................................... 21.1 54.4 3.5 11.1 4.5 5.9

 Central Equipment Not Used ........ Q 0.2 Q Q Q NF

 Room Air Conditioners Not Used .. 0.2 0.5 Q Q Q 51.6

Households Using Electric

Air-Conditioning1 .......................... 20.8 53.8 3.4 10.9 4.5 5.9

Type of Electric Air-Conditioning

Used

 Central Air-Conditioning2 .............. 11.3 36.8 1.6 6.5 2.6 8.5

 Without a Heat Pump .................. 8.7 28.3 1.4 5.1 2.1 9.9

 With a Heat Pump ....................... 2.6 8.4 Q 1.4 0.6 17.9

 Room Air-Conditioning .................. 9.4 17.1 1.8 4.4 1.9 8.6

 1 Unit .......................................... 7.1 8.7 1.4 3.4 1.3 10.1

 2 Units ......................................... 2.0 5.6 0.4 0.8 0.4 15.2

 3 or More Units ........................... 0.3 2.7 Q Q Q 23.6

Number of Rooms AirConditioned in Summer 1997

 One or Two ................................... 6.8 7.3 1.2 3.7 0.9 10.1

 Three ............................................ 4.4 4.2 0.8 2.8 0.4 12.5

 Four ............................................. 5.0 6.0 0.8 3.4 1.5 12.0

 Five or More .................................. 4.6 36.5 0.6 1.0 1.7 9.8

Percentage of Rooms

Air-Conditioned

 100% ............................................. 13.7 37.0 2.0 8.0 3.2 7.5

 50% to 99% .................................. 2.8 9.1 0.5 1.1 0.7 12.5

 25% to 49% .................................. 3.2 4.4 0.7 1.5 0.4 14.7

 1% to 24% .................................... 1.1 3.4 0.2 0.2 Q 16.1

Large Tree(s) that

Shade the Home

 Yes ................................................ 7.1 29.6 1.0 3.0 1.9 10.0

 No ................................................. 13.6 24.3 2.5 7.9 2.6 7.7

Central Air-Conditioner Age

(excludes systems for more than

one housing unit)

 Less than 5 Years ......................... 2.0 10.7 0.3 0.9 1.2 14.9

 5 to 9 Years .................................. 3.0 11.3 0.3 1.8 0.6 17.9

 10 to 19 Years .............................. 2.6 10.5 0.4 1.4 0.5 14.8

 20 Years or More .......................... 1.2 2.9 Q 0.7 0.2 21.4

 Don’t Know ................................... 2.0 1.1 0.5 1.0 Q 19.9

Central Air-Conditioning Use

 Only a Few Times ......................... 3.3 9.6 0.4 2.0 0.6 15.7

 Quite a Bit ..................................... 2.6 8.0 0.6 1.3 0.6 14.0

 All Summer ................................... 5.5 19.2 0.6 3.2 1.5 10.6

Pays for Electricity for Central

Air-Conditioning

 Yes ................................................ 10.4 36.5 1.5 5.8 2.4 8.7

 No ................................................. 0.8 0.2 Q 0.5 Q 34.9

See footnotes at end of table.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:33:57 PM on 11/10/99
Table HC4-6a. Air Conditioning by Type of Rented Housing Unit, 

 Million U.S. Households, 1997 (Continued)

Air Conditioning

Characteristics

RSE Column Factor:

Total

Rented

Units

Type of Rented Housing Unit

RSE

Row

Factors

Single-Family 

Multifamily

Two to Four Units Five or More Units Mobile Home

0.7 0.5 1.6 1.2 1.4

Age of Most-Used Room Air

Conditioner

 Less than 5 Years ......................... 3.4 5.9 0.7 1.4 0.7 11.7

 5 to 9 Years .................................. 2.3 4.8 0.6 1.0 0.4 13.7

 10 or 19 Years .............................. 1.7 4.3 0.2 0.8 0.4 15.4

 20 or More Years .......................... 0.7 1.2 Q 0.5 Q 23.6

 Don’t Know ................................... 1.4 0.8 Q 0.7 0.2 21.1

Pays for Electricity for Room

Air-Conditioning

 Yes ................................................ 7.8 16.8 1.6 3.3 1.8 8.9

 No ................................................. 1.7 0.3 0.2 1.1 Q 28.6

Room Air-Conditioning Use

 Only a Few Times ......................... 5.0 8.8 1.1 2.4 0.8 10.5

 Quite a Bit ..................................... 2.4 4.5 0.4 1.1 0.4 13.4

 All Summer ................................... 2.0 3.8 0.2 0.9 0.6 14.9

1 The number of households where the end use is electric air-conditioning excludes households that did not use their equipment (0.9 million). It does include the

small number of households where the fuel for central air-conditioning equipment was something other than electricity; those latter households were treated as if the fuel

was electricity. 2 Includes 642,000 households using room/wall air-conditioners in addition to central air-conditioning. These are excluded from the count of 25.2 million households

using only room air-conditioners.

NF = No applicable RSE row factor.

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

Notes: • To obtain the RSE percentage for any table cell, multiply the corresponding column and row factors. • Because of rounding, data may not sum to totals. 

• See "Glossary" for definition of terms used in this report.

Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 1997 Residential Energy Consumption Survey.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:33:57 PM on 11/10/99
Table HC4-7a. Air Conditioning by Four Most Populated States, 

 Million U.S. Households, 1997

Air Conditioning

Characteristics

RSE Column Factor:

Total

Four Most Populated States

RSE

Row

Factors

New York California Texas Florida

0.4 1.2 1.9 1.1 1.0

Households With Electric

Air-Conditioning Equipment ...................... 73.6 4.3 4.8 6.4 5.7 3.5

 Central Equipment Not Used ....................... 0.3 Q 0.1 (*) 0.1 29.0

 Room Air Conditioners Not Used ................ 0.7 Q Q Q 0.1 43.1

Households Using Electric

Air-Conditioning1 ........................................ 72.6 4.2 4.6 6.3 5.6 3.3

Type of Electric Air-Conditioning Used

 Central Air-Conditioning2 ............................ 47.5 1.3 3.2 4.8 4.9 5.4

 Without a Heat Pump ................................ 36.9 1.2 2.9 4.1 2.5 10.6

 With a Heat Pump ..................................... 10.6 0.1 0.3 0.7 2.4 21.2

 Room Air-Conditioning ................................ 25.2 3.0 1.4 1.6 0.7 10.7

 1 Unit ......................................................... 14.9 1.6 1.3 0.7 0.5 12.5

 2 Units ....................................................... 7.2 1.0 0.1 0.5 0.1 17.8

 3 or More Units .......................................... 3.0 0.5 Q 0.4 0.1 28.7

Number of Rooms AirConditioned in Summer 1997

 One or Two .................................................. 13.0 1.9 1.0 0.8 0.3 14.4

 Three ........................................................... 8.2 0.4 0.7 1.1 0.3 13.1

 Four ............................................................ 11.6 0.9 0.7 0.7 0.9 19.0

 Five or More ................................................ 39.8 1.0 2.2 3.7 4.1 10.5

Percentage of Rooms

Air-Conditioned

 100% ........................................................... 50.2 1.9 3.4 5.0 4.8 5.2

 50% to 99% ................................................. 11.4 0.8 0.5 0.9 0.6 16.9

 25% to 49% ................................................. 7.0 0.9 0.5 0.4 Q 17.8

 1% to 24% ................................................... 4.0 0.7 0.2 0.1 Q 15.5

Large Tree(s) that

Shade the Home

 Yes .............................................................. 35.5 1.5 1.7 3.2 3.2 9.7

 No ................................................................ 37.2 2.7 2.9 3.2 2.4 7.6

Central Air-Conditioner Age

(excludes systems for more than one

housing unit)

 Less than 5 Years ....................................... 13.1 0.5 0.6 1.6 1.0 10.5

 5 to 9 Years ................................................. 14.1 0.4 1.1 1.1 1.8 16.7

 10 to 19 Years ............................................. 12.8 0.1 0.9 1.3 1.5 14.6

 20 Years or More ......................................... 3.9 Q 0.5 0.2 0.3 16.6

 Don’t Know .................................................. 2.7 Q 0.1 0.3 0.3 28.3

Central Air-Conditioning Use

 Only a Few Times ....................................... 12.6 0.5 1.7 0.5 0.7 15.2

 Quite a Bit .................................................... 10.5 0.4 0.8 0.6 0.7 13.5

 All Summer .................................................. 24.4 0.4 0.7 3.6 3.5 9.1

Pays for Electricity for Central

Air-Conditioning

 Yes .............................................................. 46.2 1.2 3.0 4.5 4.8 5.8

 No ................................................................ 1.1 Q Q Q 0.1 43.9

See footnotes at end of table.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:34:03 PM on 11/10/99
Table HC4-7a. Air Conditioning by Four Most Populated States, 

 Million U.S. Households, 1997 (Continued)

Air Conditioning

Characteristics

RSE Column Factor:

Total

Four Most Populated States

RSE

Row

Factors

New York California Texas Florida

0.4 1.2 1.9 1.1 1.0

Age of Most-Used Room Air Conditioner

 Less than 5 Years ....................................... 8.7 1.0 0.6 0.7 0.3 12.8

 5 to 9 Years ................................................. 6.9 0.9 0.3 0.5 0.1 21.3

 10 or 19 Years ............................................. 5.7 0.7 0.3 0.2 0.2 15.6

 20 or More Years ......................................... 2.0 0.1 0.2 Q Q 20.6

 Don’t Know .................................................. 1.9 0.3 0.2 0.1 0.1 26.9

Pays for Electricity for Room

Air-Conditioning

 Yes .............................................................. 23.4 2.7 1.2 1.5 0.6 12.2

 No ................................................................ 1.7 0.3 Q 0.1 Q 32.6

Room Air-Conditioning Use

 Only a Few Times ....................................... 13.2 1.8 1.0 0.5 0.3 12.6

 Quite a Bit .................................................... 6.5 0.8 0.2 0.4 0.2 16.6

 All Summer .................................................. 5.5 0.4 0.2 0.7 0.3 23.1

1 The number of households, where the end use is electric air-conditioning, does not include households that did not use their equipment (0.9 million). It does include

the small number of households where the fuel for central air-conditioning equipment was something other than electricity; those households were treated as if the fuel

was electricity. 2 Includes 642,000 households using room/wall air-conditioners in addition to central air-conditioning. These are excluded from the count of 25.2 million households

using only room air-conditioners.

(*) = Value rounds to zero in the units displayed.

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

Notes: • To obtain the RSE percentage for any table cell, multiply the corresponding column and row factors. • Because of rounding, data may not sum to totals. 

• See "Glossary" for definition of terms used in this report.

Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 1997 Residential Energy Consumption Survey.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:34:03 PM on 11/10/99
Table HC4-8a. Air Conditioning by Urban/Rural Location, 

 Million U.S. Households, 1997

Air Conditioning

Characteristics

RSE Column Factor:

Total

Urban/Rural Location1

RSE

Row

Factors

City Town Suburbs Rural

0.5 0.8 1.4 1.3 1.3

Households With Electric

Air-Conditioning Equipment ...................... 73.6 33.7 13.3 15.0 11.6 4.3

 Central Equipment Not Used ....................... 0.3 0.3 Q Q Q 30.8

 Room Air Conditioners Not Used ................ 0.7 0.4 0.1 Q Q 29.8

Households Using Electric

Air-Conditioning2 ........................................ 72.6 33.1 13.1 14.8 11.5 4.4

Type of Electric Air-Conditioning Used

 Central Air-Conditioning3 ............................ 47.5 20.5 7.8 11.9 7.2 5.5

 Without a Heat Pump ................................ 36.9 16.4 6.5 9.1 4.9 6.7

 With a Heat Pump ..................................... 10.6 4.1 1.3 2.8 2.4 12.1

 Room Air-Conditioning ................................ 25.2 12.6 5.4 2.9 4.3 6.9

 1 Unit ......................................................... 14.9 7.8 3.0 1.7 2.4 8.9

 2 Units ....................................................... 7.2 3.3 1.7 0.8 1.4 10.8

 3 or More Units .......................................... 3.0 1.5 0.6 0.4 0.6 16.8

Number of Rooms AirConditioned in Summer 1997

 One or Two .................................................. 13.0 7.2 2.6 1.4 1.8 8.8

 Three ........................................................... 8.2 4.2 1.6 0.9 1.4 11.2

 Four ............................................................ 11.6 5.8 2.1 2.2 1.5 9.8

 Five or More ................................................ 39.8 15.9 6.8 10.3 6.8 6.0

Percentage of Rooms

Air-Conditioned

 100% ........................................................... 50.2 22.8 8.7 11.6 7.2 5.4

 50% to 99% ................................................. 11.4 4.7 2.3 2.1 2.3 8.6

 25% to 49% ................................................. 7.0 3.9 1.3 0.5 1.3 11.6

 1% to 24% ................................................... 4.0 1.7 0.9 0.7 0.7 12.7

Large Tree(s) that

Shade the Home

 Yes .............................................................. 35.5 14.3 6.5 8.2 6.5 6.5

 No ................................................................ 37.2 18.8 6.7 6.6 5.0 6.1

Central Air-Conditioner Age

(excludes systems for more than one

housing unit)

 Less than 5 Years ....................................... 13.1 5.1 2.2 3.2 2.6 7.9

 5 to 9 Years ................................................. 14.1 6.4 2.3 3.3 2.1 10.3

 10 to 19 Years ............................................. 12.8 5.0 2.3 3.7 1.8 9.8

 20 Years or More ......................................... 3.9 1.7 0.8 1.0 0.5 15.3

 Don’t Know .................................................. 2.7 1.7 0.2 0.6 0.2 20.4

Central Air-Conditioning Use

 Only a Few Times ....................................... 12.6 5.5 2.2 3.1 1.8 9.3

 Quite a Bit .................................................... 10.5 4.4 1.5 2.9 1.6 9.6

 All Summer .................................................. 24.4 10.6 4.0 6.0 3.8 7.4

Pays for Electricity for Central

Air-Conditioning

 Yes .............................................................. 46.2 19.8 7.6 11.7 7.1 5.6

 No ................................................................ 1.1 0.6 Q 0.2 0.1 30.8

See footnotes at end of table.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:34:09 PM on 11/10/99
Table HC4-8a. Air Conditioning by Urban/Rural Location, 

 Million U.S. Households, 1997 (Continued)

Air Conditioning

Characteristics

RSE Column Factor:

Total

Urban/Rural Location1

RSE

Row

Factors

City Town Suburbs Rural

0.5 0.8 1.4 1.3 1.3

Age of Most-Used Room Air Conditioner

 Less than 5 Years ....................................... 8.7 4.6 1.9 0.9 1.3 10.4

 5 to 9 Years ................................................. 6.9 3.5 1.5 0.8 1.2 11.8

 10 or 19 Years ............................................. 5.7 2.7 1.1 0.8 1.1 10.8

 20 or More Years ......................................... 2.0 0.7 0.6 0.3 0.4 19.2

 Don’t Know .................................................. 1.9 1.2 0.2 0.2 0.3 19.1

Pays for Electricity for Room

Air-Conditioning

 Yes .............................................................. 23.4 11.5 5.0 2.7 4.2 7.2

 No ................................................................ 1.7 1.1 0.3 0.2 0.1 30.0

Room Air-Conditioning Use

 Only a Few Times ....................................... 13.2 6.8 2.9 1.4 2.1 8.6

 Quite a Bit .................................................... 6.5 3.3 1.3 0.8 1.1 10.0

 All Summer .................................................. 5.5 2.6 1.1 0.7 1.1 12.7

1 Based on the household respondent’s description rather than the Federal Government definition. 2 The number of households, where the end use is electric air-conditioning, does not include households that did not use their equipment (0.9 million). It does include

the small number of households where the fuel for central air-conditioning equipment was something other than electricity; those households were treated as if the fuel

was electricity. 3 Includes 642,000 households using room/wall air-conditioners in addition to central air-conditioning. These are excluded from the count of 25.2 million households

using only room air-conditioners.

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

Notes: • To obtain the RSE percentage for any table cell, multiply the corresponding column and row factors. • Because of rounding, data may not sum to totals. 

• See "Glossary" for definition of terms used in this report.

Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 1997 Residential Energy Consumption Survey.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:34:09 PM on 11/10/99
Table HC4-9a. Air Conditioning by Northeast Census Region, 

 Million U.S. Households, 1997

Air Conditioning

Characteristics

RSE Column Factor:

Total

U.S.

Northeast Census Region

RSE

Row

Factors

Total

Census Division

Middle Atlantic New England

0.4 1.0 1.1 2.0

Households With Electric

Air-Conditioning Equipment ...................... 73.6 12.5 9.9 2.6 3.8

 Central Equipment Not Used ....................... 0.3 Q Q Q 46.6

 Room Air Conditioners Not Used ................ 0.7 0.3 0.2 Q 32.1

Households Using Electric

Air-Conditioning1 ........................................ 72.6 12.2 9.7 2.5 4.2

Type of Electric Air-Conditioning Used

 Central Air-Conditioning2 ............................ 47.5 4.4 4.0 0.4 11.2

 Without a Heat Pump ................................ 36.9 3.9 3.5 0.4 13.6

 With a Heat Pump ..................................... 10.6 0.5 0.4 Q 28.3

 Room Air-Conditioning ................................ 25.2 7.8 5.7 2.1 7.4

 1 Unit ......................................................... 14.9 4.0 2.8 1.2 9.3

 2 Units ....................................................... 7.2 2.7 2.1 0.6 10.7

 3 or More Units .......................................... 3.0 1.1 0.8 0.3 19.0

Number of Rooms AirConditioned in Summer 1997

 One or Two .................................................. 13.0 4.7 3.5 1.2 9.2

 Three ........................................................... 8.2 1.4 1.0 0.3 11.8

 Four ............................................................ 11.6 1.9 1.6 0.3 14.6

 Five or More ................................................ 39.8 4.3 3.6 0.7 8.8

Percentage of Rooms

Air-Conditioned

 100% ........................................................... 50.2 5.9 4.9 1.0 6.4

 50% to 99% ................................................. 11.4 2.3 1.8 0.4 11.2

 25% to 49% ................................................. 7.0 2.2 1.6 0.6 12.8

 1% to 24% ................................................... 4.0 1.8 1.3 0.5 12.2

Large Tree(s) that

Shade the Home

 Yes .............................................................. 35.5 5.2 4.1 1.1 7.5

 No ................................................................ 37.2 7.0 5.6 1.4 7.4

Central Air-Conditioner Age

(excludes systems for more than one

housing unit)

 Less than 5 Years ....................................... 13.1 1.3 1.2 Q 9.5

 5 to 9 Years ................................................. 14.1 1.4 1.2 0.2 19.1

 10 to 19 Years ............................................. 12.8 1.1 1.0 Q 22.5

 20 Years or More ......................................... 3.9 0.4 0.4 Q 21.8

 Don’t Know .................................................. 2.7 Q Q Q 29.4

Central Air-Conditioning Use

 Only a Few Times ....................................... 12.6 1.9 1.7 0.3 14.8

 Quite a Bit .................................................... 10.5 1.1 1.0 Q 19.3

 All Summer .................................................. 24.4 1.4 1.3 Q 10.0

Pays for Electricity for Central

Air-Conditioning

 Yes .............................................................. 46.2 4.3 3.9 0.4 11.3

 No ................................................................ 1.1 Q Q Q 46.8

See footnotes at end of table.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:34:15 PM on 11/10/99
Table HC4-9a. Air Conditioning by Northeast Census Region, 

 Million U.S. Households, 1997 (Continued)

Air Conditioning

Characteristics

RSE Column Factor:

Total

U.S.

Northeast Census Region

RSE

Row

Factors

Total

Census Division

Middle Atlantic New England

0.4 1.0 1.1 2.0

Age of Most-Used Room Air Conditioner

 Less than 5 Years ....................................... 8.7 2.6 1.8 0.7 11.0

 5 to 9 Years ................................................. 6.9 2.4 1.7 0.7 10.6

 10 or 19 Years ............................................. 5.7 1.7 1.4 0.3 12.4

 20 or More Years ......................................... 2.0 0.6 0.4 0.2 21.1

 Don’t Know .................................................. 1.9 0.5 0.4 0.1 19.4

Pays for Electricity for Room

Air-Conditioning

 Yes .............................................................. 23.4 7.2 5.3 1.9 7.2

 No ................................................................ 1.7 0.6 0.4 0.1 26.1

Room Air-Conditioning Use

 Only a Few Times ....................................... 13.2 5.2 3.8 1.4 8.3

 Quite a Bit .................................................... 6.5 1.7 1.3 0.5 8.3

 All Summer .................................................. 5.5 0.8 0.6 0.2 16.3

1 The number of households, where the end use is electric air-conditioning, does not include households that did not use their equipment (0.9 million). It does

include the small number of households where the fuel for central air-conditioning equipment was something other than electricity; those households were treated as

if the fuel was electricity. 2 Includes 642,000 households using room/wall air-conditioners in addition to central air-conditioning. These are excluded from the count of 25.2 million

households using only room air-conditioners.

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

Notes: • To obtain the RSE percentage for any table cell, multiply the corresponding column and row factors. • Because of rounding, data may not sum to totals. 

• See "Glossary" for definition of terms used in this report.

Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 1997 Residential Energy Consumption Survey.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:34:15 PM on 11/10/99
Table HC4-10a. Air Conditioning by Midwest Census Region, 

 Million U.S. Households, 1997

Air Conditioning

Characteristics

RSE Column Factor:

Total

U.S.

Midwest Census Region

RSE

Row

Factors

Total

Census Division

East North Central West North Central

0.5 1.0 1.2 1.5

Households With Electric

Air-Conditioning Equipment ...................... 73.6 18.8 12.5 6.3 2.3

 Central Equipment Not Used ....................... 0.3 Q Q Q 36.3

 Room Air Conditioners Not Used ................ 0.7 0.2 Q Q 26.4

Households Using Electric

Air-Conditioning1 ........................................ 72.6 18.6 12.4 6.3 2.2

Type of Electric Air-Conditioning Used

 Central Air-Conditioning2 ............................ 47.5 12.3 8.0 4.3 4.2

 Without a Heat Pump ................................ 36.9 11.9 7.7 4.2 4.8

 With a Heat Pump ..................................... 10.6 0.4 0.3 Q 23.3

 Room Air-Conditioning ................................ 25.2 6.3 4.3 2.0 8.1

 1 Unit ......................................................... 14.9 4.4 2.9 1.4 9.7

 2 Units ....................................................... 7.2 1.5 1.0 0.5 13.5

 3 or More Units .......................................... 3.0 0.4 0.3 Q 21.0

Number of Rooms AirConditioned in Summer 1997

 One or Two .................................................. 13.0 3.3 2.3 1.0 8.3

 Three ........................................................... 8.2 1.8 1.3 0.4 12.2

 Four ............................................................ 11.6 3.1 2.0 1.1 8.9

 Five or More ................................................ 39.8 10.5 6.8 3.8 4.9

Percentage of Rooms

Air-Conditioned

 100% ........................................................... 50.2 12.6 8.3 4.3 3.9

 50% to 99% ................................................. 11.4 3.1 2.1 1.0 9.5

 25% to 49% ................................................. 7.0 1.9 1.3 0.6 7.9

 1% to 24% ................................................... 4.0 1.0 0.7 0.4 13.9

Large Tree(s) that

Shade the Home

 Yes .............................................................. 35.5 9.3 5.9 3.4 5.7

 No ................................................................ 37.2 9.4 6.5 2.9 4.5

Central Air-Conditioner Age

(excludes systems for more than one

housing unit)

 Less than 5 Years ....................................... 13.1 3.5 2.3 1.2 7.9

 5 to 9 Years ................................................. 14.1 3.6 2.4 1.2 10.6

 10 to 19 Years ............................................. 12.8 3.1 1.8 1.3 9.9

 20 Years or More ......................................... 3.9 1.3 0.9 0.4 18.7

 Don’t Know .................................................. 2.7 0.7 0.6 Q 20.2

Central Air-Conditioning Use

 Only a Few Times ....................................... 12.6 4.6 3.1 1.6 7.3

 Quite a Bit .................................................... 10.5 3.6 2.5 1.0 9.4

 All Summer .................................................. 24.4 4.2 2.5 1.7 10.0

Pays for Electricity for Central

Air-Conditioning

 Yes .............................................................. 46.2 12.1 7.9 4.2 4.0

 No ................................................................ 1.1 0.2 Q Q 40.6

See footnotes at end of table.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:34:21 PM on 11/10/99
Table HC4-10a. Air Conditioning by Midwest Census Region, 

 Million U.S. Households, 1997 (Continued)

Air Conditioning

Characteristics

RSE Column Factor:

Total

U.S.

Midwest Census Region

RSE

Row

Factors

Total

Census Division

East North Central West North Central

0.5 1.0 1.2 1.5

Age of Most-Used Room Air Conditioner

 Less than 5 Years ....................................... 8.7 1.9 1.5 0.4 8.9

 5 to 9 Years ................................................. 6.9 1.7 1.2 0.5 13.1

 10 or 19 Years ............................................. 5.7 1.5 0.9 0.6 11.6

 20 or More Years ......................................... 2.0 0.5 0.3 0.2 21.4

 Don’t Know .................................................. 1.9 0.6 0.3 0.3 20.7

Pays for Electricity for Room

Air-Conditioning

 Yes .............................................................. 23.4 5.8 4.0 1.8 8.6

 No ................................................................ 1.7 0.5 Q Q 32.2

Room Air-Conditioning Use

 Only a Few Times ....................................... 13.2 3.5 2.2 1.3 9.3

 Quite a Bit .................................................... 6.5 1.9 1.4 0.5 12.8

 All Summer .................................................. 5.5 0.9 0.7 0.2 14.1

1 The number of households, where the end use is electric air-conditioning, does not include households that did not use their equipment (0.9 million). It does

include the small number of households where the fuel for central air-conditioning equipment was something other than electricity; those households were treated as

if the fuel was electricity. 2 Includes 642,000 households using room/wall air-conditioners in addition to central air-conditioning. These are excluded from the count of 25.2 million

households using only room air-conditioners.

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

Notes: • To obtain the RSE percentage for any table cell, multiply the corresponding column and row factors. • Because of rounding, data may not sum to totals. 

• See "Glossary" for definition of terms used in this report.

Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 1997 Residential Energy Consumption Survey.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:34:21 PM on 11/10/99
Table HC4-11a. Air Conditioning by South Census Region, 

 Million U.S. Households, 1997

Air Conditioning

Characteristics

RSE Column Factor:

Total

U.S.

South Census Region

RSE

Row

Factors

Total

Census Division

South Atlantic East South Central West South Central

0.6 0.8 1.1 1.5 1.3

Households With Electric

Air-Conditioning Equipment ...................... 73.6 33.4 17.3 6.0 10.1 1.6

 Central Equipment Not Used ....................... 0.3 Q Q Q Q 34.1

 Room Air Conditioners Not Used ................ 0.7 Q Q Q Q 29.5

Households Using Electric

Air-Conditioning1 ........................................ 72.6 33.2 17.2 6.0 10.0 1.6

Type of Electric Air-Conditioning Used

 Central Air-Conditioning2 ............................ 47.5 24.9 13.3 4.2 7.4 3.2

 Without a Heat Pump ................................ 36.9 16.4 7.1 2.9 6.4 6.4

 With a Heat Pump ..................................... 10.6 8.5 6.2 1.3 0.9 12.1

 Room Air-Conditioning ................................ 25.2 8.3 3.9 1.8 2.6 6.7

 1 Unit ......................................................... 14.9 4.2 2.3 0.9 1.1 8.2

 2 Units ....................................................... 7.2 2.6 1.1 0.6 1.0 13.2

 3 or More Units .......................................... 3.0 1.5 0.5 0.3 0.6 20.0

Number of Rooms AirConditioned in Summer 1997

 One or Two .................................................. 13.0 3.3 1.5 0.8 1.0 11.2

 Three ........................................................... 8.2 3.9 1.9 0.5 1.5 9.8

 Four ............................................................ 11.6 5.3 3.0 1.0 1.3 8.7

 Five or More ................................................ 39.8 20.7 10.9 3.7 6.2 4.1

Percentage of Rooms

Air-Conditioned

 100% ........................................................... 50.2 25.6 13.0 4.5 8.1 3.1

 50% to 99% ................................................. 11.4 5.0 2.9 0.8 1.2 8.7

 25% to 49% ................................................. 7.0 2.0 1.0 0.4 0.6 14.4

 1% to 24% ................................................... 4.0 0.7 0.3 0.2 0.2 19.9

Large Tree(s) that

Shade the Home

 Yes .............................................................. 35.5 17.8 8.9 3.6 5.3 5.4

 No ................................................................ 37.2 15.4 8.3 2.4 4.7 6.0

Central Air-Conditioner Age

(excludes systems for more than one

housing unit)

 Less than 5 Years ....................................... 13.1 7.0 3.2 1.5 2.3 6.8

 5 to 9 Years ................................................. 14.1 7.3 4.5 1.1 1.7 10.5

 10 to 19 Years ............................................. 12.8 6.9 3.7 1.0 2.3 8.0

 20 Years or More ......................................... 3.9 1.5 0.8 0.3 0.4 16.9

 Don’t Know .................................................. 2.7 1.7 0.9 Q 0.5 21.0

Central Air-Conditioning Use

 Only a Few Times ....................................... 12.6 3.6 2.2 0.6 0.7 15.0

 Quite a Bit .................................................... 10.5 4.4 2.7 0.9 0.8 7.4

 All Summer .................................................. 24.4 17.0 8.4 2.7 5.8 5.1

Pays for Electricity for Central

Air-Conditioning

 Yes .............................................................. 46.2 24.2 13.0 4.1 7.1 3.5

 No ................................................................ 1.1 0.6 0.3 Q Q 37.0

See footnotes at end of table.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:34:27 PM on 11/10/99
Table HC4-11a. Air Conditioning by South Census Region, 

 Million U.S. Households, 1997 (Continued)

Air Conditioning

Characteristics

RSE Column Factor:

Total

U.S.

South Census Region

RSE

Row

Factors

Total

Census Division

South Atlantic East South Central West South Central

0.6 0.8 1.1 1.5 1.3

Age of Most-Used Room Air Conditioner

 Less than 5 Years ....................................... 8.7 3.1 1.4 0.6 1.1 10.8

 5 to 9 Years ................................................. 6.9 2.3 1.0 0.5 0.8 12.1

 10 or 19 Years ............................................. 5.7 1.9 0.9 0.5 0.5 10.5

 20 or More Years ......................................... 2.0 0.5 0.2 0.1 Q 13.0

 Don’t Know .................................................. 1.9 0.5 0.3 Q Q 21.4

Pays for Electricity for Room

Air-Conditioning

 Yes .............................................................. 23.4 7.9 3.6 1.7 2.5 7.2

 No ................................................................ 1.7 0.4 Q 0.1 Q 31.1

Room Air-Conditioning Use

 Only a Few Times ....................................... 13.2 2.8 1.3 0.8 0.7 10.8

 Quite a Bit .................................................... 6.5 2.2 1.1 0.3 0.8 11.3

 All Summer .................................................. 5.5 3.3 1.5 0.7 1.2 11.4

1 The number of households, where the end use is electric air-conditioning, does not include households that did not use their equipment (0.9 million). It does include

the small number of households where the fuel for central air-conditioning equipment was something other than electricity; those households were treated as if the fuel

was electricity. 2 Includes 642,000 households using room/wall air-conditioners in addition to central air-conditioning. These are excluded from the count of 25.2 million households

using only room air-conditioners.

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

Notes: • To obtain the RSE percentage for any table cell, multiply the corresponding column and row factors. • Because of rounding, data may not sum to totals. 

• See "Glossary" for definition of terms used in this report.

Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 1997 Residential Energy Consumption Survey.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:34:27 PM on 11/10/99
Table HC4-12a. Air Conditioning by West Census Region, 

 Million U.S. Households, 1997

Air Conditioning

Characteristics

RSE Column Factor:

Total

U.S.

West Census Region

RSE

Row

Factors

Total

Census Division

Mountain Pacific

0.4 1.2 1.5 1.6

Households With Electric

Air-Conditioning Equipment ...................... 73.6 8.9 3.0 5.9 6.9

 Central Equipment Not Used ....................... 0.3 0.2 Q Q 38.5

 Room Air Conditioners Not Used ................ 0.7 Q Q Q 46.6

Households Using Electric

Air-Conditioning1 ........................................ 72.6 8.7 2.9 5.7 6.9

Type of Electric Air-Conditioning Used

 Central Air-Conditioning2 ............................ 47.5 5.9 2.1 3.8 7.9

 Without a Heat Pump ................................ 36.9 4.7 1.6 3.1 10.6

 With a Heat Pump ..................................... 10.6 1.1 0.5 0.7 13.1

 Room Air-Conditioning ................................ 25.2 2.8 0.8 1.9 11.3

 1 Unit ......................................................... 14.9 2.3 0.6 1.6 12.7

 2 Units ....................................................... 7.2 0.4 0.2 0.3 15.4

 3 or More Units .......................................... 3.0 Q Q Q 30.0

Number of Rooms AirConditioned in Summer 1997

 One or Two .................................................. 13.0 1.8 0.6 1.2 11.6

 Three ........................................................... 8.2 1.2 0.4 0.8 13.5

 Four ............................................................ 11.6 1.3 0.5 0.8 13.0

 Five or More ................................................ 39.8 4.3 1.5 2.9 11.3

Percentage of Rooms

Air-Conditioned

 100% ........................................................... 50.2 6.2 2.1 4.1 8.9

 50% to 99% ................................................. 11.4 1.1 0.5 0.6 14.8

 25% to 49% ................................................. 7.0 0.9 0.2 0.7 18.1

 1% to 24% ................................................... 4.0 0.5 0.1 0.3 19.8

Large Tree(s) that

Shade the Home

 Yes .............................................................. 35.5 3.3 1.2 2.1 9.1

 No ................................................................ 37.2 5.4 1.8 3.6 8.6

Central Air-Conditioner Age

(excludes systems for more than one

housing unit)

 Less than 5 Years ....................................... 13.1 1.3 0.7 0.7 14.3

 5 to 9 Years ................................................. 14.1 1.8 0.5 1.3 14.5

 10 to 19 Years ............................................. 12.8 1.6 0.5 1.1 9.7

 20 Years or More ......................................... 3.9 0.7 0.2 0.5 22.6

 Don’t Know .................................................. 2.7 0.2 Q Q 28.1

Central Air-Conditioning Use

 Only a Few Times ....................................... 12.6 2.5 0.6 1.9 13.6

 Quite a Bit .................................................... 10.5 1.5 0.5 1.0 14.3

 All Summer .................................................. 24.4 1.9 1.0 0.9 9.6

Pays for Electricity for Central

Air-Conditioning

 Yes .............................................................. 46.2 5.6 2.0 3.6 8.4

 No ................................................................ 1.1 0.3 Q Q 37.6

See footnotes at end of table.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:34:34 PM on 11/10/99
Table HC4-12a. Air Conditioning by West Census Region, 

 Million U.S. Households, 1997 (Continued)

Air Conditioning

Characteristics

RSE Column Factor:

Total

U.S.

West Census Region

RSE

Row

Factors

Total

Census Division

Mountain Pacific

0.4 1.2 1.5 1.6

Age of Most-Used Room Air Conditioner

 Less than 5 Years ....................................... 8.7 1.1 0.3 0.8 13.9

 5 to 9 Years ................................................. 6.9 0.5 Q 0.4 20.4

 10 or 19 Years ............................................. 5.7 0.6 0.2 0.4 16.4

 20 or More Years ......................................... 2.0 0.4 Q 0.2 21.0

 Don’t Know .................................................. 1.9 0.3 Q Q 30.4

Pays for Electricity for Room

Air-Conditioning

 Yes .............................................................. 23.4 2.5 0.8 1.7 11.4

 No ................................................................ 1.7 0.2 Q Q 40.3

Room Air-Conditioning Use

 Only a Few Times ....................................... 13.2 1.7 0.5 1.2 12.1

 Quite a Bit .................................................... 6.5 0.6 0.2 0.4 18.2

 All Summer .................................................. 5.5 0.4 0.1 0.3 17.9

1 The number of households, where the end use is electric air-conditioning, does not include households that did not use their equipment (0.9 million). It does

include the small number of households where the fuel for central air-conditioning equipment was something other than electricity; those households were treated as

if the fuel was electricity. 2 Includes 642,000 households using room/wall air-conditioners in addition to central air-conditioning. These are excluded from the count of 25.2 million

households using only room air-conditioners.

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

Notes: • To obtain the RSE percentage for any table cell, multiply the corresponding column and row factors. • Because of rounding, data may not sum to totals. 

• See "Glossary" for definition of terms used in this report.

Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 1997 Residential Energy Consumption Survey.

Energy Information Administration/Housing Characteristics 1997

Table Layout at 12:34:34 PM on 11/10/99