Total......................................................................... 111.1 10.9 26.1 27.3 24.0 22.8

Floorspace (Square Feet)

Total Floorspace2

Fewer than 500.................................................. 3.2 Q 0.8 0.9 0.8 0.5

500 to 999.......................................................... 23.8 1.5 5.4 5.5 6.1 5.3

1,000 to 1,499.................................................... 20.8 1.4 4.0 5.2 5.0 5.2

1,500 to 1,999.................................................... 15.4 1.4 3.1 3.5 3.6 3.8

2,000 to 2,499.................................................... 12.2 1.4 3.2 3.0 2.3 2.3

2,500 to 2,999.................................................... 10.3 1.5 2.3 2.7 2.1 1.7

3,000 to 3,499.................................................... 6.7 1.0 2.0 1.7 1.0 1.0

3,500 to 3,999.................................................... 5.2 0.8 1.5 1.5 0.7 0.7

4,000 or More..................................................... 13.3 1.7 3.7 3.3 2.3 2.3

Heated Floorspace

None.................................................................. 3.6 Q 0.5 Q 1.4 1.4

Fewer than 500.................................................. 6.1 0.2 1.2 1.5 1.9 1.2

500 to 999.......................................................... 27.7 2.3 6.9 6.5 6.5 5.6

1,000 to 1,499.................................................... 26.0 1.9 5.3 6.4 6.1 6.4

1,500 to 1,999.................................................... 17.6 1.9 4.0 4.5 3.3 3.9

2,000 to 2,499.................................................... 10.7 1.3 2.6 3.1 1.9 1.8

2,500 to 2,999.................................................... 7.7 1.1 2.1 1.6 1.5 1.4

3,000 to 3,499.................................................... 3.8 0.6 1.2 1.1 0.5 0.4

3,500 to 3,999.................................................... 2.6 0.6 0.9 0.7 Q Q

4,000 or More..................................................... 5.2 1.0 1.3 1.7 0.6 0.6

Centrally Cooled Floorspace

None.................................................................. 45.2 6.2 13.7 12.2 9.0 4.1

Fewer than 500.................................................. 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 to 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

Rooms

Total Number of Rooms

(Excluding Bathrooms)

1 or 2.................................................................. 3.4 0.2 0.9 0.9 0.7 0.6

3......................................................................... 8.6 0.5 1.9 2.2 2.1 1.8

4......................................................................... 16.9 1.6 3.7 4.2 3.6 3.9

5......................................................................... 23.9 2.1 5.8 5.5 5.4 5.1

6......................................................................... 22.9 2.4 4.8 5.3 5.3 5.1

7......................................................................... 16.5 1.7 3.7 4.1 3.6 3.3

8......................................................................... 9.8 1.2 2.4 2.7 1.8 1.7

9 or More............................................................ 9.2 1.2 2.7 2.4 1.5 1.3

4,000 to 

5,499 HDD

Housing 

Units 

(millions)

Less than 

4,000 HDD

Table HC9.2 Living Space Characteristics by Climate Zone, 2005

 Million U.S. Housing Units

Climate Zone1

Less than 2,000 CDD and -- 2,000 CDD 

or More

and Less 

than 4,000 

HDD

Greater than 

7,000 HDD

5,500 to 

Living Space Characteristics 7,000 HDD

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
4,000 to 

5,499 HDD

Housing 

Units 

(millions)

Less than 

4,000 HDD

Table HC9.2 Living Space Characteristics by Climate Zone, 2005

 Million U.S. Housing Units

Climate Zone1

Less than 2,000 CDD and -- 2,000 CDD 

or More

and Less 

than 4,000 

HDD

Greater than 

7,000 HDD

5,500 to 

Living Space Characteristics 7,000 HDD

Bedrooms

None (Studio/Efficiency)..................................... 1.9 Q 0.6 0.6 0.4 0.3

1......................................................................... 10.2 0.6 2.4 2.7 2.4 2.2

2......................................................................... 28.7 2.8 7.2 7.0 6.1 5.6

3......................................................................... 47.5 4.5 10.6 11.4 10.4 10.6

4......................................................................... 18.4 2.3 4.2 4.6 3.8 3.5

5 or More............................................................ 4.3 0.6 1.1 1.1 0.9 0.7

Other Rooms (Excluding Bathrooms)

None (Studio/Efficiency)..................................... 1.9 Q 0.6 0.6 0.4 0.3

1......................................................................... 5.3 0.6 1.0 1.0 1.3 1.3

2......................................................................... 37.4 3.1 8.3 9.1 8.8 8.0

3......................................................................... 35.0 3.5 7.7 8.2 7.8 7.8

4......................................................................... 19.2 2.2 5.2 4.9 3.5 3.4

5 or More............................................................ 12.2 1.4 3.3 3.4 2.2 1.9

Full Bathrooms

None.................................................................. 0.3 Q Q Q Q N

1......................................................................... 54.9 5.6 15.9 15.1 10.2 8.1

2......................................................................... 45.9 4.1 8.3 9.5 11.2 12.8

3 or More............................................................ 9.9 1.2 1.7 2.7 2.5 1.9

Half Bathrooms

None.................................................................. 79.4 7.1 18.3 18.4 17.5 18.1

1......................................................................... 29.7 3.5 7.4 8.3 6.1 4.5

2 or More............................................................ 2.0 0.3 0.5 0.6 0.4 Q

Basements

Basement in Single-Family Homes

and Apartments in 2-4 Unit Buildings

Yes.................................................................... 35.5 7.1 14.1 11.5 2.5 0.3

No...................................................................... 51.9 2.2 6.8 9.7 16.0 17.1

Not Asked (Mobile Homes or Apartment in

Buildings with 5 or More Units)........................... 23.7 1.6 5.2 6.0 5.5 5.4

Finished Basement

Yes................................................................. 16.7 3.5 5.7 6.4 1.2 Q

No.................................................................. 18.7 3.6 8.4 5.2 1.3 Q

No Basement................................................. 51.9 2.2 6.8 9.7 16.0 17.1

Not Asked....................................................... 23.7 1.6 5.2 6.0 5.5 5.4

Number of Finished Rooms

in Basement

1..................................................................... 8.1 1.3 3.1 3.3 0.4 N

2..................................................................... 3.8 0.9 1.4 1.2 0.3 Q

3 or More........................................................ 4.8 1.3 1.3 1.8 0.4 Q

None (Basement Unfinished).......................... 18.7 3.6 8.4 5.2 1.3 Q

No Basement................................................. 51.9 2.2 6.8 9.7 16.0 17.1

Not Asked....................................................... 23.7 1.6 5.2 6.0 5.5 5.4

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
4,000 to 

5,499 HDD

Housing 

Units 

(millions)

Less than 

4,000 HDD

Table HC9.2 Living Space Characteristics by Climate Zone, 2005

 Million U.S. Housing Units

Climate Zone1

Less than 2,000 CDD and -- 2,000 CDD 

or More

and Less 

than 4,000 

HDD

Greater than 

7,000 HDD

5,500 to 

Living Space Characteristics 7,000 HDD

Heated Basement

Yes................................................................. 20.7 4.6 7.6 7.6 0.9 Q

All............................................................... 14.3 3.2 5.1 5.4 0.5 Q

Part............................................................. 6.4 1.4 2.5 2.2 0.3 N

None (Basement Not Heated)........................ 14.8 2.4 6.5 3.9 1.6 0.3

No Basement................................................. 51.9 2.2 6.8 9.7 16.0 17.1

Not Asked....................................................... 23.7 1.6 5.2 6.0 5.5 5.4

Air-Conditioned Basement

Yes................................................................. 11.4 2.2 3.5 5.0 0.6 Q

All............................................................... 8.4 1.6 2.8 3.7 0.4 Q

Part............................................................. 3.0 0.6 0.8 1.3 Q N

No (Basement Not Cooled)............................. 24.1 4.8 10.5 6.6 1.9 0.3

No Basement................................................. 51.9 2.2 6.8 9.7 16.0 17.1

Not Asked....................................................... 23.7 1.6 5.2 6.0 5.5 5.4

Attics

Attic in Single-Family Homes and

Apartments in 2-4 Unit Buildings

Yes.................................................................... 22.8 1.1 5.8 5.0 5.2 5.7

No...................................................................... 64.6 8.2 15.1 16.2 13.3 11.8

Not Asked (Mobile Homes or Apartment in

Buildings with 5 or More Units)........................... 23.7 1.6 5.2 6.0 5.5 5.4

Finished Attic

Yes................................................................. 2.7 0.2 0.8 0.7 0.5 0.6

No.................................................................. 20.1 0.9 5.0 4.4 4.7 5.1

No Attic.......................................................... 64.6 8.2 15.1 16.2 13.3 11.8

Not Asked....................................................... 23.7 1.6 5.2 6.0 5.5 5.4

Number of Finished Rooms in Attic

1..................................................................... 2.2 0.2 0.6 0.5 0.4 0.5

2 or More........................................................ 0.5 N 0.2 Q Q Q

None (Attic Unfinished)................................... 20.1 0.9 5.0 4.4 4.7 5.1

No Attic.......................................................... 64.6 8.2 15.1 16.2 13.3 11.8

Not Asked....................................................... 23.7 1.6 5.2 6.0 5.5 5.4

Heated Attic

Yes................................................................. 1.3 Q 0.5 0.4 Q Q

All............................................................... 1.0 Q 0.4 0.3 Q Q

Part............................................................. 0.3 N Q Q N Q

No (Attic Not Heated)..................................... 21.5 1.0 5.3 4.6 5.1 5.4

No Attic.......................................................... 64.6 8.2 15.1 16.2 13.3 11.8

Not Asked....................................................... 23.7 1.6 5.2 6.0 5.5 5.4

Air-Conditioned Attic

Yes................................................................. 1.0 Q 0.3 0.3 Q Q

All............................................................... 0.7 Q 0.2 Q Q Q

Part............................................................. 0.3 N Q Q Q Q

No (Attic Not Cooled)...................................... 21.9 1.0 5.5 4.7 5.1 5.5

No Attic.......................................................... 64.6 8.2 15.1 16.2 13.3 11.8

Not Asked....................................................... 23.7 1.6 5.2 6.0 5.5 5.4

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
4,000 to 

5,499 HDD

Housing 

Units 

(millions)

Less than 

4,000 HDD

Table HC9.2 Living Space Characteristics by Climate Zone, 2005

 Million U.S. Housing Units

Climate Zone1

Less than 2,000 CDD and -- 2,000 CDD 

or More

and Less 

than 4,000 

HDD

Greater than 

7,000 HDD

5,500 to 

Living Space Characteristics 7,000 HDD

Garage/Carport

(Single-Family and Mobile Homes)

Yes........................................................................ 61.5 7.5 14.4 12.5 13.7 13.3

Attached............................................................. 41.8 4.8 8.8 8.7 9.9 9.5

1-Car Garage................................................. 9.5 0.9 2.5 2.6 2.1 1.4

2-Car Garage................................................. 28.4 3.2 5.7 5.5 6.8 7.2

3 or More Car Garage..................................... 3.8 0.7 0.7 0.5 1.1 0.8

Detached........................................................... 15.2 2.6 5.1 3.2 2.6 1.7

1-Car Garage................................................. 6.1 1.0 2.0 1.5 0.8 0.7

2-Car Garage................................................. 7.8 1.2 2.8 1.3 1.7 0.7

3 or More Car Garage..................................... 1.4 0.4 0.3 0.4 Q 0.3

Carport (only)..................................................... 4.7 Q 0.5 0.6 1.3 2.1

No.......................................................................... 25.1 2.0 5.4 7.7 5.2 4.8

Not Asked (All Apartments)................................... 24.5 1.4 6.3 7.1 5.1 4.6

 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. Excludes floorspace in unheated garages.

 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