Total............................................................ 111.1 100.0 225.8 100.0 179.8 100.0 114.5 100.0

Total Floorspace (Square Feet)1

Fewer than 500......................................... 3.2 2.9 1.2 0.5 1.1 0.6 0.4 0.3

500 to 999................................................ 23.8 21.4 17.5 7.7 15.9 8.8 7.3 6.4

1,000 to 1,499.......................................... 20.8 18.7 24.1 10.7 22.6 12.6 13.0 11.4

1,500 to 1,999.......................................... 15.4 13.9 24.5 10.9 22.2 12.4 14.0 12.2

2,000 to 2,499.......................................... 12.2 11.0 25.1 11.1 21.2 11.8 13.1 11.5

2,500 to 2,999.......................................... 10.3 9.3 26.0 11.5 20.7 11.5 13.9 12.1

3,000 to 3,499.......................................... 6.7 6.0 20.3 9.0 14.7 8.2 9.4 8.2

3,500 to 3,999.......................................... 5.2 4.7 18.6 8.2 13.1 7.3 7.9 6.9

4,000 or More........................................... 13.3 12.0 68.7 30.4 48.3 26.9 35.6 31.1

Heated Floorspace (Square Feet)

None......................................................... 3.6 3.2 4.1 1.8 0.0 0.0 1.3 1.1

Fewer than 500......................................... 6.1 5.5 4.6 2.0 2.2 1.2 0.8 0.7

500 to 999................................................ 27.7 25.0 27.5 12.2 21.2 11.8 9.8 8.5

1,000 to 1,499.......................................... 26.0 23.4 41.6 18.4 32.1 17.9 18.6 16.3

1,500 to 1,999.......................................... 17.6 15.9 38.5 17.0 30.6 17.0 19.5 17.1

2,000 to 2,499.......................................... 10.7 9.6 29.2 12.9 23.8 13.3 15.0 13.1

2,500 to 2,999.......................................... 7.7 6.9 24.5 10.9 21.0 11.7 15.1 13.2

3,000 to 3,499.......................................... 3.8 3.4 14.7 6.5 12.2 6.8 8.5 7.4

3,500 to 3,999.......................................... 2.6 2.3 11.3 5.0 9.6 5.3 5.9 5.2

4,000 or More........................................... 5.2 4.7 29.9 13.3 27.0 15.0 20.0 17.5

Cooled Floorspace (Square Feet)

None......................................................... 45.2 40.7 76.1 33.7 57.1 31.8 0.0 0.0

Fewer than 500......................................... 3.9 3.5 4.3 1.9 3.1 1.7 1.5 1.3

500 to 999................................................ 15.0 13.5 19.1 8.5 14.8 8.2 11.6 10.1

1,000 to 1,499.......................................... 15.6 14.0 26.7 11.8 21.1 11.7 19.3 16.8

1,500 to 1,999.......................................... 11.1 10.0 24.7 11.0 19.8 11.0 19.4 16.9

2,000 to 2,499.......................................... 7.0 6.3 19.4 8.6 15.6 8.7 15.5 13.6

2,500 to 2,999.......................................... 5.2 4.7 16.0 7.1 14.4 8.0 14.1 12.3

3,000 to 3,499.......................................... 2.7 2.4 10.7 4.7 8.7 4.8 8.7 7.6

3,500 to 3,999.......................................... 1.8 1.6 8.9 3.9 7.2 4.0 6.7 5.9

4,000 or More........................................... 3.5 3.2 20.0 8.9 18.0 10.0 17.8 15.5

Total Number of Rooms

(Excluding Bathrooms)

1 or 2........................................................ 3.4 3.1 2.1 0.9 1.7 1.0 0.6 0.6

3............................................................... 8.6 7.7 6.5 2.9 5.6 3.1 2.3 2.0

4............................................................... 16.9 15.2 19.0 8.4 15.6 8.7 7.1 6.2

5............................................................... 23.9 21.5 39.0 17.3 31.1 17.3 18.1 15.8

6............................................................... 22.9 20.6 50.5 22.4 39.0 21.7 25.5 22.2

7............................................................... 16.5 14.8 43.5 19.3 34.5 19.2 23.2 20.3

8............................................................... 9.8 8.8 30.7 13.6 24.5 13.6 17.0 14.8

9 or More.................................................. 9.2 8.2 34.6 15.3 27.8 15.5 20.7 18.1

Bedrooms

None (Studio/Efficiency)............................... 1.9 1.7 1.1 0.5 1.0 0.5 0.4 0.4

1............................................................... 10.2 9.2 8.2 3.6 6.7 3.7 2.7 2.4

2............................................................... 28.7 25.8 39.6 17.5 31.1 17.3 15.7 13.7

3............................................................... 47.5 42.7 105.1 46.6 83.6 46.5 55.4 48.4

4............................................................... 18.4 16.6 56.2 24.9 45.0 25.1 32.1 28.0

5 or More.................................................. 4.3 3.9 15.6 6.9 12.4 6.9 8.2 7.1

Percent

Total Square Footage

Living Space Characteristics

Total1 Housing Units Heated Cooled

Table HC1.2.1. Living Space Characteristics by

 Total, Heated, and Cooled Floorspace, 2005

Millions Percent Billions Percent Billions Percent Billions

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Percent

Total Square Footage

Living Space Characteristics

Total1 Housing Units Heated Cooled

Table HC1.2.1. Living Space Characteristics by

 Total, Heated, and Cooled Floorspace, 2005

Millions Percent Billions Percent Billions Percent Billions

Other Rooms (Excluding Bathrooms)

None (Studio/Efficiency)........................... 1.9 1.7 1.1 0.5 1.0 0.5 0.4 0.4

1............................................................... 5.3 4.8 6.0 2.7 4.9 2.7 2.9 2.5

2............................................................... 37.4 33.6 50.1 22.2 40.8 22.7 20.9 18.2

3............................................................... 35.0 31.5 72.7 32.2 56.9 31.6 36.9 32.2

4............................................................... 19.2 17.3 53.3 23.6 42.4 23.6 28.7 25.1

5 or More.................................................. 12.2 11.0 42.6 18.9 33.8 18.8 24.8 21.6

Full Bathrooms

None......................................................... 0.3 0.3 Q Q Q Q 0.0 0.0

1............................................................... 54.9 49.4 84.4 37.4 65.2 36.3 28.0 24.4

2............................................................... 45.9 41.3 105.1 46.5 84.0 46.7 63.3 55.3

3 or More.................................................. 9.9 9.0 35.9 15.9 30.2 16.8 23.2 20.3

Half Bathrooms

None......................................................... 79.4 71.5 138.5 61.4 108.3 60.2 65.2 57.0

1............................................................... 29.7 26.7 80.7 35.7 66.2 36.8 45.3 39.6

2 or More.................................................. 2.0 1.8 6.6 2.9 5.3 2.9 4.0 3.5

Basement (in Single-Family Homes and

Apartments in 2-4 Unit Buildings

Yes........................................................... 35.5 31.9 106.8 47.3 81.6 45.4 47.7 41.7

No............................................................. 51.9 46.8 97.1 43.0 78.6 43.7 55.6 48.5

Not Asked (Mobile Home or Apartment

Building with 5 or More Units)................... 23.7 21.3 21.9 9.7 19.6 10.9 11.2 9.8

Finished Basement

Yes....................................................... 16.7 15.1 52.4 23.2 44.9 25.0 29.6 25.9

No......................................................... 18.7 16.9 54.4 24.1 36.7 20.4 18.1 15.8

No Basement........................................ 51.9 46.8 97.1 43.0 78.6 43.7 55.6 48.5

Not Asked............................................. 23.7 21.3 21.9 9.7 19.6 10.9 11.2 9.8

Number of Finished Rooms

in Basement

1........................................................... 8.1 7.3 24.0 10.6 19.8 11.0 11.5 10.0

2........................................................... 3.8 3.5 12.0 5.3 10.1 5.6 7.1 6.2

3 or More.............................................. 4.8 4.3 16.5 7.3 15.0 8.4 11.1 9.7

Basement Unfinished............................ 18.7 16.9 54.4 24.1 36.7 20.4 18.1 15.8

No Basement........................................ 51.9 46.8 97.1 43.0 78.6 43.7 55.6 48.5

Not Asked............................................. 23.7 21.3 21.9 9.7 19.6 10.9 11.2 9.8

Heated Basement

Yes....................................................... 20.7 18.6 62.6 27.7 57.4 31.9 36.0 31.4

All...................................................... 14.3 12.9 43.8 19.4 41.6 23.1 27.1 23.7

Part................................................... 6.4 5.8 18.9 8.4 15.9 8.8 8.8 7.7

Basement Not Heated........................... 14.8 13.3 44.1 19.5 24.2 13.5 11.7 10.2

No Basement........................................ 51.9 46.8 97.1 43.0 78.6 43.7 55.6 48.5

Not Asked............................................. 23.7 21.3 21.9 9.7 19.6 10.9 11.2 9.8

Air-Conditioned Basement

Yes....................................................... 11.4 10.2 35.7 15.8 33.7 18.8 30.9 27.0

All...................................................... 8.4 7.6 26.5 11.7 25.5 14.2 23.8 20.8

Part................................................... 3.0 2.7 9.2 4.1 8.2 4.6 7.0 6.1

Basement Not Cooled........................... 24.1 21.7 71.0 31.5 47.9 26.6 16.8 14.7

No Basement........................................ 51.9 46.8 97.1 43.0 78.6 43.7 55.6 48.5

Not Asked............................................. 23.7 21.3 21.9 9.7 19.6 10.9 11.2 9.8

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Percent

Total Square Footage

Living Space Characteristics

Total1 Housing Units Heated Cooled

Table HC1.2.1. Living Space Characteristics by

 Total, Heated, and Cooled Floorspace, 2005

Millions Percent Billions Percent Billions Percent Billions

Attic (in Single-Family Homes and

Apartments in 2-4 Unit Buildings)

Yes........................................................... 22.8 20.6 81.5 36.1 48.2 26.8 33.7 29.4

No............................................................. 64.6 58.1 122.5 54.2 112.0 62.3 69.6 60.8

Not Asked (Mobile Home or Apartment

Building with 5 or More Units)............... 23.7 21.3 21.9 9.7 19.6 10.9 11.2 9.8

Finished Attic

Yes....................................................... 2.7 2.5 10.0 4.4 6.6 3.7 3.7 3.3

No......................................................... 20.1 18.1 71.4 31.6 41.6 23.1 29.9 26.1

No Attic................................................. 64.6 58.1 122.5 54.2 112.0 62.3 69.6 60.8

Not Asked............................................. 23.7 21.3 21.9 9.7 19.6 10.9 11.2 9.8

Number of Finished Rooms in Attic

1........................................................... 2.2 2.0 8.1 3.6 5.2 2.9 3.0 2.6

2 or More.............................................. 0.5 0.5 2.0 0.9 1.4 0.8 0.7 0.6

Attic Unfinished..................................... 20.1 18.1 71.4 31.6 41.6 23.1 29.9 26.1

No Attic................................................. 64.6 58.1 122.5 54.2 112.0 62.3 69.6 60.8

Not Asked............................................. 23.7 21.3 21.9 9.7 19.6 10.9 11.2 9.8

Heated Attic

Yes....................................................... 1.3 1.2 4.9 2.2 4.4 2.4 3.0 2.6

All...................................................... 1.0 0.9 3.4 1.5 3.2 1.8 2.0 1.7

Part................................................... 0.3 0.3 1.5 0.7 1.2 0.7 1.0 0.9

Attic Not Heated.................................... 21.5 19.4 76.6 33.9 43.8 24.4 30.7 26.8

No Attic................................................. 64.6 58.1 122.5 54.2 112.0 62.3 69.6 60.8

Not Asked............................................. 23.7 21.3 21.9 9.7 19.6 10.9 11.2 9.8

Air-Conditioned Attic

Yes....................................................... 1.0 0.9 3.9 1.7 3.5 1.9 2.9 2.5

All...................................................... 0.7 0.6 2.6 1.1 2.4 1.3 1.9 1.6

Part................................................... 0.3 0.3 1.3 0.6 1.1 0.6 1.0 0.9

Attic Not Cooled.................................... 21.9 19.7 77.6 34.4 44.7 24.9 30.8 26.9

No Attic................................................. 64.6 58.1 122.5 54.2 112.0 62.3 69.6 60.8

Not Asked............................................. 23.7 21.3 21.9 9.7 19.6 10.9 11.2 9.8

Garage/Carport

(Single-Family and Mobile Homes)

Yes........................................................... 61.5 55.3 156.1 69.1 125.8 70.0 87.5 76.5

Attached............................................... 41.8 37.6 108.8 48.2 91.9 51.1 69.1 60.4

1-Car Garage.................................... 9.5 8.6 19.7 8.7 15.8 8.8 9.9 8.6

2-Car Garage.................................... 28.4 25.6 76.4 33.8 64.5 35.9 50.2 43.9

3 or More Car Garage....................... 3.8 3.5 12.7 5.6 11.5 6.4 9.0 7.9

Detached.............................................. 15.2 13.7 38.9 17.2 27.9 15.5 14.4 12.6

1-Car Garage.................................... 6.1 5.5 14.0 6.2 9.5 5.3 4.2 3.7

2-Car Garage.................................... 7.8 7.0 21.1 9.3 15.6 8.7 8.4 7.3

3 or More Car Garage....................... 1.4 1.2 3.8 1.7 2.9 1.6 1.8 1.6

Carport (only)........................................ 4.7 4.2 9.0 4.0 6.3 3.5 4.1 3.6

No............................................................. 25.1 22.6 46.7 20.7 34.0 18.9 16.9 14.8

Not Asked (Apartments)........................... 24.5 22.0 23.0 10.2 20.0 11.1 10.0 8.8

 1. 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.

 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 2,033 1,618 1,031 791 630 401

Total Floorspace (Square Feet)

Fewer than 500............................................... 3.2 357 336 113 188 177 59

500 to 999....................................................... 23.8 733 667 308 343 312 144

1,000 to 1,499................................................. 20.8 1,157 1,086 625 435 409 235

1,500 to 1,999................................................. 15.4 1,592 1,441 906 595 539 339

2,000 to 2,499................................................. 12.2 2,052 1,733 1,072 765 646 400

2,500 to 2,999................................................. 10.3 2,523 2,010 1,346 939 748 501

3,000 to 3,499................................................. 6.7 3,020 2,185 1,401 1,177 851 546

3,500 to 3,999................................................. 5.2 3,549 2,509 1,508 1,344 950 571

4,000 or More.................................................. 13.3 5,147 3,621 2,667 1,705 1,199 883

Heated Floorspace (Square Feet)1

None............................................................... 3.6 1,145 0 352 387 0 119

Fewer than 500............................................... 6.1 745 359 134 375 180 67

500 to 999....................................................... 27.7 992 766 353 469 362 167

1,000 to 1,499................................................. 26.0 1,599 1,234 715 621 479 277

1,500 to 1,999................................................. 17.6 2,184 1,739 1,109 782 622 397

2,000 to 2,499................................................. 10.7 2,724 2,227 1,401 971 794 499

2,500 to 2,999................................................. 7.7 3,174 2,718 1,956 1,050 899 647

3,000 to 3,499................................................. 3.8 3,884 3,232 2,250 1,442 1,200 835

3,500 to 3,999................................................. 2.6 4,388 3,741 2,310 1,420 1,211 748

4,000 or More.................................................. 5.2 5,740 5,169 3,833 1,860 1,675 1,242

Cooled Floorspace (Square Feet)

None............................................................... 45.2 1,683 1,262 0 674 506 0

Fewer than 500............................................... 3.9 1,094 791 376 502 363 173

500 to 999....................................................... 15.0 1,269 985 771 584 453 355

1,000 to 1,499................................................. 15.6 1,716 1,356 1,240 680 537 491

1,500 to 1,999................................................. 11.1 2,219 1,780 1,740 783 628 614

2,000 to 2,499................................................. 7.0 2,770 2,228 2,221 952 766 764

2,500 to 2,999................................................. 5.2 3,083 2,779 2,719 1,016 916 896

3,000 to 3,499................................................. 2.7 3,958 3,228 3,212 1,497 1,221 1,215

3,500 to 3,999................................................. 1.8 4,947 4,005 3,757 1,485 1,202 1,127

4,000 or More.................................................. 3.5 5,680 5,109 5,046 1,795 1,615 1,595

Total Number of Rooms

(Excluding Bathrooms)

1 or 2............................................................... 3.4 620 505 188 408 332 124

3...................................................................... 8.6 761 652 272 460 394 165

4...................................................................... 16.9 1,120 923 419 491 405 184

5...................................................................... 23.9 1,634 1,303 759 650 518 302

6...................................................................... 22.9 2,204 1,702 1,112 812 627 410

7...................................................................... 16.5 2,639 2,094 1,411 937 744 501

8...................................................................... 9.8 3,148 2,507 1,739 1,076 857 595

9 or More......................................................... 9.2 3,772 3,034 2,256 1,143 920 684

Bedrooms

None (Studio/Efficiency)..................................... 1.9 552 508 210 375 345 143

1...................................................................... 10.2 805 657 266 533 435 176

2...................................................................... 28.7 1,381 1,084 548 619 486 245

3...................................................................... 47.5 2,214 1,760 1,167 822 653 433

4...................................................................... 18.4 3,051 2,447 1,743 966 775 552

5 or More......................................................... 4.3 3,587 2,846 1,879 924 733 484

Table HC1.2.2 Living Space Characteristics by Average Floorspace, 

Housing 

Units 

(millions) Heated Cooled

Per Housing Unit

Living Space Characteristics Total1 Heated Cooled Total1

 Per Housing Unit and Per Household Member, 2005

Per Household Member

Average Square Feet

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC1.2.2 Living Space Characteristics by Average Floorspace, 

Housing 

Units 

(millions) Heated Cooled

Per Housing Unit

Living Space Characteristics Total1 Heated Cooled Total1

 Per Housing Unit and Per Household Member, 2005

Per Household Member

Average Square Feet

Other Rooms (Excluding Bathrooms)

None (Studio/Efficiency).................................. 1.9 552 508 210 375 345 143

1...................................................................... 5.3 1,135 925 547 487 397 235

2...................................................................... 37.4 1,341 1,091 559 552 449 230

3...................................................................... 35.0 2,076 1,624 1,052 803 628 407

4...................................................................... 19.2 2,776 2,209 1,495 995 792 536

5 or More......................................................... 12.2 3,483 2,766 2,026 1,211 961 704

Full Bathrooms

None............................................................... 0.3 1,436 920 0 732 469 0

1...................................................................... 54.9 1,538 1,188 509 665 514 220

2...................................................................... 45.9 2,288 1,830 1,380 825 660 498

3 or More......................................................... 9.9 3,607 3,041 2,337 1,177 992 762

Half Bathrooms

None............................................................... 79.4 1,744 1,364 821 709 554 334

1...................................................................... 29.7 2,718 2,229 1,526 960 787 539

2 or More......................................................... 2.0 3,339 2,674 2,029 1,158 928 704

Basement (in Single-Family Homes and

Apartments in 2-4 Unit Buildings)

Yes................................................................. 35.5 3,011 2,301 1,345 1,123 859 502

No................................................................... 51.9 1,870 1,513 1,070 699 565 400

Not Asked (Mobile Home or Apartment...........

Building with 5 or More Units).......................... 23.7 926 828 474 427 382 219

Finished Basement

Yes.............................................................. 16.7 3,131 2,683 1,770 1,116 957 631

No............................................................... 18.7 2,903 1,960 966 1,130 763 376

No Basement............................................... 51.9 1,870 1,513 1,070 699 565 400

Not Asked.................................................... 23.7 926 828 474 427 382 219

Number of Finished Rooms

in Basement

1.................................................................. 8.1 2,950 2,438 1,411 1,087 898 520

2.................................................................. 3.8 3,117 2,625 1,841 1,083 912 640

3 or More..................................................... 4.8 3,449 3,146 2,322 1,189 1,085 801

Basement Unfinished.................................. 18.7 2,903 1,960 966 1,130 763 376

No Basement............................................... 51.9 1,870 1,513 1,070 699 565 400

Not Asked.................................................... 23.7 926 828 474 427 382 219

Heated Basement

Yes.............................................................. 20.7 3,027 2,775 1,739 1,124 1,030 646

All............................................................ 14.3 3,064 2,911 1,901 1,142 1,085 709

Part.......................................................... 6.4 2,944 2,474 1,379 1,083 910 508

Basement Not Heated................................. 14.8 2,988 1,637 794 1,122 615 298

No Basement............................................... 51.9 1,870 1,513 1,070 699 565 400

Not Asked.................................................... 23.7 926 828 474 427 382 219

Air-Conditioned Basement

Yes.............................................................. 11.4 3,142 2,965 2,714 1,106 1,044 956

All............................................................ 8.4 3,147 3,029 2,831 1,110 1,069 999

Part.......................................................... 3.0 3,130 2,783 2,382 1,095 974 833

Basement Not Cooled................................. 24.1 2,948 1,988 699 1,132 763 268

No Basement............................................... 51.9 1,870 1,513 1,070 699 565 400

Not Asked.................................................... 23.7 926 828 474 427 382 219

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC1.2.2 Living Space Characteristics by Average Floorspace, 

Housing 

Units 

(millions) Heated Cooled

Per Housing Unit

Living Space Characteristics Total1 Heated Cooled Total1

 Per Housing Unit and Per Household Member, 2005

Per Household Member

Average Square Feet

Attic (in Single-Family Homes and

Apartments in 2-4 Unit Buildings)

Yes................................................................. 22.8 3,566 2,109 1,473 1,319 780 545

No................................................................... 64.6 1,897 1,735 1,079 711 650 404

Not Asked (Mobile Home or Apartment

Building with 5 or More Units)...................... 23.7 926 828 474 427 382 219

Finished Attic

Yes.............................................................. 2.7 3,683 2,413 1,368 1,246 816 463

No............................................................... 20.1 3,550 2,068 1,487 1,330 775 558

No Attic........................................................ 64.6 1,897 1,735 1,079 711 650 404

Not Asked.................................................... 23.7 926 828 474 427 382 219

Number of Finished Rooms in Attic

1.................................................................. 2.2 3,631 2,326 1,357 1,302 834 487

2 or More..................................................... 0.5 3,913 2,795 1,415 1,059 757 383

Attic Unfinished........................................... 20.1 3,550 2,068 1,487 1,330 775 558

No Attic........................................................ 64.6 1,897 1,735 1,079 711 650 404

Not Asked.................................................... 23.7 926 828 474 427 382 219

Heated Attic

Yes.............................................................. 1.3 3,671 3,292 2,257 1,145 1,026 704

All............................................................ 1.0 3,419 3,183 1,967 1,108 1,031 637

Part.......................................................... 0.3 4,418 3,614 3,118 1,239 1,013 874

Attic Not Heated.......................................... 21.5 3,559 2,035 1,425 1,332 762 533

No Attic........................................................ 64.6 1,897 1,735 1,079 711 650 404

Not Asked.................................................... 23.7 926 828 474 427 382 219

Air-Conditioned Attic

Yes.............................................................. 1.0 4,000 3,625 2,988 1,343 1,217 1,003

All............................................................ 0.7 3,900 3,602 2,810 1,300 1,200 936

Part.......................................................... 0.3 4,220 3,676 3,379 1,442 1,256 1,155

Attic Not Cooled.......................................... 21.9 3,546 2,042 1,406 1,318 759 523

No Attic........................................................ 64.6 1,897 1,735 1,079 711 650 404

Not Asked.................................................... 23.7 926 828 474 427 382 219

Garage/Carport

(Single-Family and Mobile Homes)

Yes................................................................. 61.5 2,540 2,046 1,424 944 761 529

Attached...................................................... 41.8 2,603 2,199 1,654 941 795 598

1-Car Garage........................................... 9.5 2,064 1,664 1,039 775 624 390

2-Car Garage........................................... 28.4 2,688 2,270 1,767 973 822 639

3 or More Car Garage.............................. 3.8 3,307 2,995 2,340 1,093 990 773

Detached..................................................... 15.2 2,561 1,840 950 993 714 369

1-Car Garage........................................... 6.1 2,310 1,561 699 912 617 276

2-Car Garage........................................... 7.8 2,715 2,009 1,084 1,039 769 415

3 or More Car Garage.............................. 1.4 2,803 2,123 1,308 1,079 817 503

Carport (only)............................................... 4.7 1,909 1,342 882 815 573 376

No................................................................... 25.1 1,859 1,353 675 696 506 253

Not Asked (Apartments).................................. 24.5 941 818 410 436 379 190

 1 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.

 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 86.6 2,522 1,970 1,310 1,812 1,475 821 1,055 944 554

Total Floorspace (Square Feet)

Fewer than 500............................. 3.2 0.9 261 336 162 Q Q Q 334 260 Q

500 to 999.................................... 23.8 9.4 670 683 320 705 666 274 811 721 363

1,000 to 1,499.............................. 20.8 15.0 1,121 1,083 622 1,129 1,052 535 1,228 1,090 676

1,500 to 1,999.............................. 15.4 14.4 1,574 1,450 945 1,628 1,327 629 1,712 1,489 808

2,000 to 2,499.............................. 12.2 11.9 2,039 1,731 1,055 2,143 1,813 1,152 Q Q Q

2,500 to 2,999.............................. 10.3 10.1 2,519 2,004 1,357 2,492 2,103 1,096 Q Q Q

3,000 or 3,499.............................. 6.7 6.6 3,014 2,175 1,438 3,047 2,079 1,108 N N N

3,500 to 3,999.............................. 5.2 5.1 3,549 2,505 1,518 Q Q Q N N N

4,000 or More............................... 13.3 13.2 5,154 3,626 2,690 4,980 3,527 2,460 N N N

Heated Floorspace (Square Feet)1

None............................................. 3.6 1.7 1,628 0 372 Q Q Q 824 0 Q

Fewer than 500............................. 6.1 3.0 1,086 352 182 767 342 Q 545 357 Q

500 to 999.................................... 27.7 15.0 1,306 793 392 1,088 793 348 879 785 404

1,000 to 1,499.............................. 26.0 20.6 1,785 1,245 751 1,424 1,231 531 1,251 1,238 756

1,500 to 1,999.............................. 17.6 16.7 2,221 1,745 1,133 2,056 1,690 1,051 1,746 1,676 709

2,000 to 2,499.............................. 10.7 10.6 2,752 2,223 1,396 2,624 2,296 1,349 Q Q Q

2,500 to 2,999.............................. 7.7 7.6 3,204 2,720 1,983 2,935 2,690 1,402 Q Q Q

3,000 or 3,499.............................. 3.8 3.7 3,908 3,227 2,301 Q Q Q N N N

3,500 to 3,999.............................. 2.6 2.5 4,398 3,739 2,311 Q Q Q N N N

4,000 or More............................... 5.2 5.2 5,755 5,178 3,873 Q Q Q N N N

Cooled Floorspace (Square Feet)

None............................................. 45.2 31.5 2,228 1,611 0 1,621 1,221 0 945 813 0

Fewer than 500............................. 3.9 2.8 1,411 975 386 1,267 841 353 843 674 366

500 to 999.................................... 15.0 9.4 1,738 1,218 779 1,268 1,065 771 962 874 820

1,000 to 1,499.............................. 15.6 12.5 1,955 1,449 1,249 1,453 1,318 1,275 1,240 1,173 1,240

1,500 to 1,999.............................. 11.1 10.6 2,263 1,804 1,746 1,973 1,697 1,697 Q Q Q

2,000 to 2,499.............................. 7.0 6.8 2,814 2,251 2,221 2,623 2,252 2,265 Q Q Q

2,500 to 2,999.............................. 5.2 5.1 3,097 2,775 2,725 QQQQQQ

3,000 or 3,499.............................. 2.7 2.7 3,970 3,224 3,208 Q Q Q N N N

3,500 to 3,999.............................. 1.8 1.8 4,971 4,040 3,757 Q Q Q N N N

4,000 or More............................... 3.5 3.5 5,711 5,139 5,072 Q Q Q N N N

Total Number of Rooms

(Excluding Bathrooms)

1 or 2............................................ 3.4 0.3 QQQQQQQQQ

3................................................... 8.6 2.2 1,204 817 Q 817 714 235 710 551 209

4................................................... 16.9 8.6 1,428 1,110 427 1,292 1,011 525 877 766 439

5................................................... 23.9 19.0 1,870 1,441 847 1,722 1,393 754 1,105 994 574

6................................................... 22.9 21.8 2,330 1,777 1,177 1,769 1,439 823 1,351 1,254 803

7................................................... 16.5 16.1 2,708 2,132 1,453 2,433 2,058 1,113 1,589 1,563 1,020

8................................................... 9.8 9.6 3,204 2,542 1,769 2,789 2,392 1,567 Q Q Q

9 or More...................................... 9.2 9.0 3,811 3,058 2,310 3,911 3,003 1,847 Q Q Q

Bedrooms

None (Studio/Efficiency)................... 1.9 N NNNNNNNNN

1................................................... 10.2 2.3 1,341 1,009 291 968 739 Q 597 356 Q

2................................................... 28.7 17.0 1,875 1,348 633 1,432 1,147 643 882 783 442

3................................................... 47.5 45.1 2,369 1,856 1,255 1,977 1,676 971 1,203 1,099 681

4................................................... 18.4 18.1 3,104 2,491 1,784 2,845 2,120 1,404 1,785 1,717 1,139

5 or More...................................... 4.3 4.2 3,661 2,878 2,007 QQQQQQ

Heated Cooled

Single-Family Detached

Total1

Average Square Feet per Housing Unit

Table HC1.2.3 Living Space Characteristics by Average Floorspace--

 Single-Family Housing Units and Mobile Homes, 2005

Single-Family Attached Mobile Homes

Total1 Housing Unit Characteristics Heated Cooled Total Heated Cooled 1

SingleFamily

and

Mobile

Homes

(millions)

 Housing 

Units 

(millions)

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Heated Cooled

Single-Family Detached

Total1

Average Square Feet per Housing Unit

Table HC1.2.3 Living Space Characteristics by Average Floorspace--

 Single-Family Housing Units and Mobile Homes, 2005

Single-Family Attached Mobile Homes

Total1 Housing Unit Characteristics Heated Cooled Total Heated Cooled 1

SingleFamily

and

Mobile

Homes

(millions)

 Housing 

Units 

(millions)

Other Rooms (Excluding Bathrooms s)

None (Studio/Efficiency)............... 1.9 N NNNNNNNNN

1................................................... 5.3 2.8 1,732 1,331 899 Q Q Q 813 689 417

2................................................... 37.4 24.1 1,795 1,402 762 1,299 1,043 508 949 839 438

3................................................... 35.0 29.4 2,351 1,812 1,195 1,910 1,510 848 1,319 1,213 786

4................................................... 19.2 18.4 2,895 2,283 1,567 2,423 2,089 1,150 1,616 1,483 913

5 or More...................................... 12.2 12.0 3,558 2,812 2,074 3,064 2,461 1,661 Q Q Q

Full Bathrooms

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

1................................................... 54.9 35.1 2,092 1,542 698 1,533 1,183 454 798 700 244

2................................................... 45.9 41.6 2,559 2,021 1,519 1,981 1,672 1,249 1,206 1,087 761

3 or More...................................... 9.9 9.7 3,715 3,118 2,403 3,128 2,797 1,959 Q Q Q

Half Bathrooms

None............................................. 79.4 57.6 2,247 1,701 1,090 1,532 1,229 539 1,040 924 569

1................................................... 29.7 27.0 3,007 2,455 1,701 2,118 1,762 1,112 1,207 1,131 403

2 or More...................................... 2.0 1.9 3,575 2,877 2,146 QQQQQQ

Basement (in Single-Family Homes and

Apartments in 2-4 Unit Buildings)

Yes............................................... 35.5 34.0 3,174 2,428 1,466 2,247 1,731 820 N N N

No................................................ 51.9 45.7 2,051 1,641 1,199 1,383 1,224 822 N N N

Not Asked (Mobile Home or Apartment

Building with 5 or More Units)....... 23.7 6.9 NNNNNN 1,055 944 554

Finished Basement

Yes........................................... 16.7 16.2 3,262 2,783 1,879 2,241 2,101 1,191 N N N

No............................................. 18.7 17.7 3,091 2,092 1,076 2,252 1,466 554 N N N

No Basement............................ 51.9 45.7 2,051 1,641 1,199 1,383 1,224 822 N N N

Not Asked................................. 23.7 6.9 NNNNNN 1,055 944 554

Number of Finished Rooms

in Basement

1............................................... 8.1 7.9 3,100 2,531 1,498 1,891 1,858 860 N N N

2............................................... 3.8 3.7 3,244 2,768 1,974 1,839 1,603 1,380 N N N

3 or More.................................. 4.8 4.6 3,566 3,243 2,475 2,897 2,669 1,516 N N N

Basement Unfinished................ 18.7 17.7 3,091 2,092 1,076 2,252 1,466 554 N N N

No Basement............................ 51.9 45.7 2,051 1,641 1,199 1,383 1,224 822 N N N

Not Asked................................. 23.7 6.9 NNNNNN 1,055 944 554

Heated Basement

Yes........................................... 20.7 20.0 3,179 2,900 1,863 2,115 2,049 1,125 N N N

All.......................................... 14.3 13.8 3,231 3,053 2,048 2,055 2,067 1,139 N N N

Part....................................... 6.4 6.2 3,064 2,560 1,453 2,259 2,008 1,091 N N N

Basement Not Heated............... 14.8 14.0 3,167 1,737 884 2,407 1,346 451 N N N

No Basement............................ 51.9 45.7 2,051 1,641 1,199 1,383 1,224 822 N N N

Not Asked................................. 23.7 6.9 NNNNNN 1,055 944 554

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Heated Cooled

Single-Family Detached

Total1

Average Square Feet per Housing Unit

Table HC1.2.3 Living Space Characteristics by Average Floorspace--

 Single-Family Housing Units and Mobile Homes, 2005

Single-Family Attached Mobile Homes

Total1 Housing Unit Characteristics Heated Cooled Total Heated Cooled 1

SingleFamily

and

Mobile

Homes

(millions)

 Housing 

Units 

(millions)

Air-Conditioned Basement

Yes........................................... 11.4 11.2 3,273 3,072 2,836 2,201 2,217 1,888 N N N

All.......................................... 8.4 8.3 3,232 3,096 2,893 2,379 2,433 2,258 N N N

Part....................................... 3.0 2.8 3,400 2,997 2,661 1,802 1,735 1,061 N N N

Basement Not Cooled............... 24.1 22.8 3,125 2,105 779 2,266 1,537 394 N N N

No Basement............................ 51.9 45.7 2,051 1,641 1,199 1,383 1,224 822 N N N

Not Asked................................. 23.7 6.9 NNNNNN 1,055 944 554

Attic (in Single-Family Homes and

Apartments in 2-4 Unit Buildings s)

Yes............................................... 22.8 22.7 3,614 2,136 1,511 2,675 1,612 907 N N N

No................................................ 64.6 56.9 2,054 1,899 1,224 1,664 1,452 806 N N N

Not Asked (Mobile Home or Apartment

Building with 5 or More Units)... 23.7 6.9 NNNNNN 1,055 944 554

Finished Attic

Yes........................................... 2.7 2.7 3,866 2,535 1,488 1,956 1,105 Q N N N

No............................................. 20.1 20.0 3,583 2,086 1,514 2,886 1,761 1,060 N N N

No Attic..................................... 64.6 56.9 2,054 1,899 1,224 1,664 1,452 806 N N N

Not Asked................................. 23.7 6.9 NNNNNN 1,055 944 554

Number of Finished Rooms in Attic

1............................................... 2.2 2.2 3,816 2,454 1,427 Q Q Q N N N

2 or More.................................. 0.5 0.5 4,124 2,952 1,806 Q Q Q N N N

Attic Unfinished......................... 20.1 20.0 3,583 2,086 1,514 2,886 1,761 1,060 N N N

No Attic..................................... 64.6 56.9 2,054 1,899 1,224 1,664 1,452 806 N N N

Not Asked................................. 23.7 6.9 NNNNNN 1,055 944 554

Heated Attic

Yes........................................... 1.3 1.3 3,838 3,460 2,494 Q Q Q N N N

All.......................................... 1.0 1.0 3,611 3,395 2,245 Q Q Q N N N

Part....................................... 0.3 0.3 4,432 3,628 3,145 Q Q Q N N N

Attic Not Heated........................ 21.5 21.4 3,601 2,058 1,453 2,775 1,661 990 N N N

No Attic..................................... 64.6 56.9 2,054 1,899 1,224 1,664 1,452 806 N N N

Not Asked................................. 23.7 6.9 NNNNNN 1,055 944 554

Air-Conditioned Attic

Yes........................................... 1.0 0.9 4,099 3,711 3,177 Q Q Q N N N

All.......................................... 0.7 0.6 4,045 3,729 3,050 Q Q Q N N N

Part....................................... 0.3 0.3 QQQQQQN NN

Attic Not Cooled........................ 21.9 21.8 3,593 2,067 1,438 2,715 1,633 931 N N N

No Attic..................................... 64.6 56.9 2,054 1,899 1,224 1,664 1,452 806 N N N

Not Asked................................. 23.7 6.9 NNNNNN 1,055 944 554

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Heated Cooled

Single-Family Detached

Total1

Average Square Feet per Housing Unit

Table HC1.2.3 Living Space Characteristics by Average Floorspace--

 Single-Family Housing Units and Mobile Homes, 2005

Single-Family Attached Mobile Homes

Total1 Housing Unit Characteristics Heated Cooled Total Heated Cooled 1

SingleFamily

and

Mobile

Homes

(millions)

 Housing 

Units 

(millions)

Garage/Carport

(Single-Family and Mobile Homes)

Yes............................................... 61.5 61.5 2,609 2,094 1,467 2,035 1,726 1,058 1,251 1,107 771

Attached................................... 41.8 41.8 2,645 2,229 1,688 2,055 1,791 1,188 Q Q Q

1-Car Garage........................ 9.5 9.5 2,137 1,693 1,062 1,554 1,459 874 N N N

2-Car Garage........................ 28.4 28.4 2,710 2,289 1,789 2,332 1,953 1,367 Q Q Q

3 or More Car Garage........... 3.8 3.8 3,315 3,006 2,362 Q Q Q N N N

Detached.................................. 15.2 15.2 2,637 1,878 977 2,052 1,612 574 1,208 1,113 801

1-Car Garage........................ 6.1 6.1 2,372 1,572 712 2,346 1,913 Q Q Q Q

2-Car Garage........................ 7.8 7.8 2,793 2,057 1,105 1,767 1,308 Q Q Q Q

3 or More Car Garage........... 1.4 1.4 2,887 2,180 1,384 QQQQQQ

Carport (only)............................ 4.7 4.7 2,105 1,438 943 Q Q Q 1,227 1,027 659

No................................................ 25.1 25.1 2,216 1,539 761 1,582 1,216 574 1,001 899 493

Not Asked (Apartments)............... 24.5 N NNNNNNNNN

 1. 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.

 -- = Data Not Applicable.

 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 24.5 1,090 902 341 872 780 441

Total Floorspace (Square Feet)

Fewer than 500...................................... 3.1 2.3 403 360 165 366 348 93

500 to 999.............................................. 22.2 14.4 763 660 277 730 646 303

1,000 to 1,499........................................ 19.1 5.8 1,223 1,130 496 1,187 1,086 696

1,500 to 1,999........................................ 14.4 1.0 1,700 1,422 412 1,698 1,544 1,348

2,000 to 2,499........................................ 12.7 0.4 2,139 1,598 QQQQ

2,500 to 2,999........................................ 10.1 QQQQQQQ

3,000 or More......................................... 29.6 0.3 QQQQQQ

Heated Floorspace (Square Feet)

None...................................................... 3.6 1.8 1,048 0 Q 827 0 407

Fewer than 500...................................... 6.1 3.2 716 373 93 490 362 126

500 to 999.............................................. 27.7 12.7 811 754 297 744 728 315

1,000 to 1,499........................................ 26.0 5.4 1,318 1,215 518 1,196 1,190 736

1,500 to 1,999........................................ 17.6 0.9 2,121 1,735 509 1,707 1,707 1,327

2,000 to 2,499........................................ 10.7 QQQQQQQ

2,500 to 2,999........................................ 7.8 QQQQQQQ

3,000 or More......................................... 11.6 QQQQQQQ

Cooled Floorspace (Square Feet)

None...................................................... 45.2 13.8 1,130 887 0 773 681 0

Fewer than 500...................................... 3.9 1.2 653 498 399 609 531 357

500 to 999.............................................. 15.1 5.7 795 732 795 783 716 734

1,000 to 1,499........................................ 15.6 3.0 1,290 1,247 1,247 1,181 1,098 1,181

1,500 to 1,999........................................ 11.1 0.5 Q Q Q 1,704 1,546 1,704

2,000 to 2,499........................................ 7.0 QQQQQQQ

2,500 to 2,999........................................ 5.2 QQQQQQQ

3,000 or More......................................... 8.0 Q N N N Q Q Q

Total Number of Rooms

(Excluding Bathrooms)

1 or 2...................................................... 3.4 3.1 760 378 Q 614 549 215

3............................................................. 8.6 6.4 757 649 350 708 642 292

4............................................................. 16.9 8.3 1,066 846 205 924 834 475

5............................................................. 23.9 4.9 1,129 988 438 1,119 992 674

6............................................................. 22.9 1.1 1,398 1,118 531 1,396 1,295 951

7............................................................. 16.5 0.4 QQQQQQ

8............................................................. 9.8 QQQQQQQ

9 or More................................................ 9.2 QQQQQQQ

Bedrooms

None (Studio/Efficiency)............................ 1.9 1.9 543 398 Q 554 528 209

1............................................................. 10.2 7.9 854 642 186 704 620 318

2............................................................. 28.7 11.7 1,092 901 395 978 886 514

3............................................................. 47.5 2.4 1,243 1,098 350 1,423 1,262 925

4............................................................. 18.4 0.3 QQQQQQ

5 or More................................................ 4.3 QQQQQQQ

Table HC1.2.4 Living Space Characteristics by Average Floorspace--Apartments, 2005

Total Heated Cooled Total Heated Cooled

2 to 4 Unit Building

Living Space Characteristics

5 or More Unit Building

Average Square Feet per Apartment in a --

 Housing 

Units 

(millions) Apartments

(millions)

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC1.2.4 Living Space Characteristics by Average Floorspace--Apartments, 2005

Total Heated Cooled Total Heated Cooled

2 to 4 Unit Building

Living Space Characteristics

5 or More Unit Building

Average Square Feet per Apartment in a --

 Housing 

Units 

(millions) Apartments

(millions)

Other Rooms (Excluding Bathrooms)

None (Studio/Efficiency)......................... 1.9 1.9 543 398 Q 554 528 209

1............................................................. 5.3 2.5 988 667 406 840 753 327

2............................................................. 37.4 13.3 977 822 237 853 764 388

3............................................................. 35.0 5.7 1,190 976 407 1,018 886 673

4............................................................. 19.2 0.8 1,433 1,241 695 Q Q Q

5 or More................................................ 12.2 0.3 QQQQQQ

Full Bathrooms

None...................................................... 0.3 QQQQQQQ

1............................................................. 54.9 19.8 1,041 850 223 803 734 336

2............................................................. 45.9 4.3 1,253 1,088 841 1,148 969 856

3 or More................................................ 9.9 0.3 QQQQQQ

Half Bathrooms

None...................................................... 79.4 21.8 1,057 901 310 831 736 390

1............................................................. 29.7 2.7 1,252 903 514 1,303 1,242 987

2 or More................................................ 2.0 QQQQNNN

Basement (in Single-Family Homes and

Apartments in 2-4 Unit Buildings

Yes........................................................ 35.5 1.5 1,656 1,204 262 N N N

No.......................................................... 51.9 6.2 952 829 360 N N N

Not Asked (Mobile Home or Apartment..

Building with 5 or More Units)................. 23.7 16.7 N N N 872 780 441

Finished Basement

Yes..................................................... 16.7 0.5 2,101 1,605 Q N N N

No...................................................... 18.7 1.0 1,428 997 Q N N N

No Basement...................................... 51.9 6.2 952 829 360 N N N

Not Asked........................................... 23.7 16.7 N N N 872 780 441

Number of Finished Rooms

in Basement

1......................................................... 8.1 QQQQNNN

2......................................................... 3.8 QQQQNNN

3 or More............................................ 4.8 QQQQNNN

Basement Unfinished......................... 18.7 1.0 1,428 997 Q N N N

No Basement...................................... 51.9 6.2 952 829 360 N N N

Not Asked........................................... 23.7 16.7 N N N 872 780 441

Heated Basement

Yes..................................................... 20.7 0.7 1,818 1,727 Q N N N

All................................................... 14.3 0.5 1,821 1,790 Q N N N

Part................................................. 6.4 QQQQNNN

Basement Not Heated........................ 14.8 0.8 1,518 756 Q N N N

No Basement...................................... 51.9 6.2 952 829 360 N N N

Not Asked........................................... 23.7 16.7 N N N 872 780 441

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC1.2.4 Living Space Characteristics by Average Floorspace--Apartments, 2005

Total Heated Cooled Total Heated Cooled

2 to 4 Unit Building

Living Space Characteristics

5 or More Unit Building

Average Square Feet per Apartment in a --

 Housing 

Units 

(millions) Apartments

(millions)

Air-Conditioned Basement

Yes..................................................... 11.4 QQQQNNN

All................................................... 8.4 QQQQNNN

Part................................................. 3.0 QQQQNNN

Basement Not Cooled........................ 24.1 1.3 1,638 1,110 Q N N N

No Basement...................................... 51.9 6.2 952 829 360 N N N

Not Asked........................................... 23.7 16.7 N N N 872 780 441

Attic (in Single-Family Homes and

Apartments in 2-4 Unit Buildings)

Yes........................................................ 22.8 QQQQNNN

No.......................................................... 64.6 7.6 1,056 887 347 N N N

Not Asked (Mobile Home or Apartment

Building with 5 or More Units)............. 23.7 16.7 N N N 872 780 441

Finished Attic

Yes..................................................... 2.7 QQQQNNN

No...................................................... 20.1 QQQQNNN

No Attic............................................... 64.6 7.6 1,056 887 347 N N N

Not Asked........................................... 23.7 16.7 N N N 872 780 441

Number of Finished Rooms in Attic

1......................................................... 2.2 NNNNNNN

2 or More............................................ 0.5 QQQQNNN

Attic Unfinished.................................. 20.1 QQQQNNN

No Attic............................................... 64.6 7.6 1,056 887 347 N N N

Not Asked........................................... 23.7 16.7 N N N 872 780 441

Heated Attic

Yes..................................................... 1.3 QQQQNNN

All................................................... 1.0 QQQQNNN

Part................................................. 0.3 NNNNNNN

Attic Not Heated................................. 21.5 QQQQNNN

No Attic............................................... 64.6 7.6 1,056 887 347 N N N

Not Asked........................................... 23.7 16.7 N N N 872 780 441

Air-Conditioned Attic

Yes..................................................... 1.0 QQQQNNN

All................................................... 0.7 QQQQNNN

Part................................................. 0.3 NNNNNNN

Attic Not Cooled................................. 21.9 QQQQNNN

No Attic............................................... 64.6 7.6 1,056 887 347 N N N

Not Asked........................................... 23.7 16.7 N N N 872 780 441

 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.

 -- = Data Not Applicable.

 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 6.1 27.7 26.0 17.6 10.0 7 7.8 11.6

No Main Space Heating Equipment............. 1.2 N N N N N N N

Have Main Space Heating Equipment.......... 109.8 6.1 27.7 26.0 17.6 10.0 7 7.8 11.6

Use Main Space Heating Equipment........... 109.1 6.1 27.7 26.0 17.6 10.0 7 7.8 11.6

Have Equipment But Do Not Use it.............. 0.8 N NNNNNN

Main Space Heating Usage During 2005

Total Number of Rooms

(Excluding Bathrooms)

None........................................................ 2.1 N Q Q NNNN

1 or 2....................................................... 3.1 1.4 1.3 Q N Q N Q

3............................................................... 8.3 1.4 5.6 0.9 Q N N Q

4............................................................... 16.6 1.7 9.0 3.8 1.1 Q Q Q

5............................................................... 23.3 0.8 7.1 8.9 3.4 1.0 3 0.7 0.9

6............................................................... 22.6 0.5 2.7 7.2 5.8 3.0 1.7 1.5

7............................................................... 16.3 Q 1.4 3.4 3.7 3.0 2 1.9 2.5

8............................................................... 9.7 Q 0.4 1.0 2.4 1.0 6 2.0 2.2

9 or More................................................. 9.1 Q 0.2 0.7 1.3 1.0 4 1.3 4.2

At Home Behavior

Home Used for Business

Yes....................................................... 8.9 Q 1.3 1.4 1.6 1.0 4 0.9 2.0

No........................................................ 102.2 5.9 26.5 24.7 16.0 9.0 3 6.8 9.6

Someone Home All Day

Yes....................................................... 56.4 2.8 12.9 14.1 9.2 5.0 4 4.4 5.9

No........................................................ 54.7 3.3 14.9 12.0 8.4 5.0 3 3.4 5.7

Housing Unit Characteristics Affecting Usage

Climate Zone1

Fewer than 2,000 CDD and--

More than 7,000 HDD........................... 10.9 0.2 2.3 1.9 1.9 1.0 3 1.1 2.2

5,500 to 7,000 HDD.............................. 26.1 1.2 6.9 5.3 4.0 2.0 6 2.1 3.4

4,000 to 5,499 HDD.............................. 27.3 1.5 6.5 6.4 4.5 3.0 1.7 3.5

Less than 4,000 HDD........................... 24.0 1.9 6.5 6.1 3.3 1.0 9 1.5 1.4

2000 CDD or More and--

Less than 4,000 HDD............................... 22.8 1.2 5.6 6.4 3.9 1.0 8 1.4 1.1

Adequacy of Insulation

Well Insulated.......................................... 42.8 1.9 9.1 9.1 7.4 4.0 8 3.6 6.3

Adequately Insulated................................ 46.3 2.4 11.0 11.5 7.5 4.0 6 3.4 4.3

Poorly Insulated....................................... 19.0 1.5 6.5 4.8 2.5 1.0 3 0.7 0.9

No Insulation............................................ 1.4 Q 0.4 0.3 Q N Q N

Don't Know............................................... 1.7 Q 0.6 0.4 QQQQ

Home is Too Drafty During the Winter.....

Never....................................................... 62.9 3.2 14.5 14.3 10.3 6.0 5 4.7 7.5

Some of the Time.................................... 32.4 1.7 8.1 7.8 5.5 3.0 0 2.4 3.0

Most of the Time...................................... 6.1 0.4 2.0 1.6 0.8 0.0 4 0.3 0.5

All of the Time.......................................... 5.6 0.5 1.9 1.5 0.7 0.0 5 Q Q

Don't Know............................................... 4.1 0.3 1.4 0.9 0.4 0.0 3 Q 0.4

2,000 to

2,499

2,500 to

2,999

3,000

or More

Table HC1.3 Heated Floorspace Usage Indicators, 2005

Heated Floorspace (square feet)

Fewer

than 500

500 to

999

1,000 to 

1,499

Housing 

Units 

Usage Indicators (millions)

 Million U.S. Housing Units

1,500 to

1,999

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
2,000 to

2,499

2,500 to

2,999

3,000

or More

Table HC1.3 Heated Floorspace Usage Indicators, 2005

Heated Floorspace (square feet)

Fewer

than 500

500 to

999

1,000 to 

1,499

Housing 

Units 

Usage Indicators (millions)

 Million U.S. Housing Units

1,500 to

1,999

Unusually High Ceilings

Yes.......................................................... 27.2 0.7 3.1 4.6 5.2 4.0 3.2 5.8

No............................................................ 76.9 4.9 21.3 19.3 12.1 6.0 5 4.5 5.7

Not Asked (Mobile Homes)...................... 6.9 0.6 3.3 2.1 0.4 Q Q N

Cathedral Ceilings

(In Housing Units with High Ceilings)

Yes....................................................... 17.1 0.3 1.6 2.8 3.3 2.0 9 1.9 4.1

No........................................................ 10.1 0.4 1.5 1.9 1.9 1.0 2 1.3 1.8

Type of Glass in Windows

Single-pane Glass.................................... 50.7 3.9 16.3 12.6 6.9 3.0 5 2.1 2.9

Double-pane Glass

Without Low-e Coating......................... 50.6 2.0 10.5 12.0 8.6 5.0 7 4.5 6.5

With Low-e Coating.............................. 8.0 Q 0.7 1.2 1.7 1.0 3 1.0 1.8

Triple-pane Glass

Without Low-e Coating......................... 1.0 N Q Q Q Q Q 0.3

With Low-e Coating.............................. 0.3 N QQQQNQ

Proportion of Original Windows Replaced

All............................................................. 22.4 1.3 4.6 5.6 3.9 2.0 6 1.7 2.5

Some....................................................... 21.6 0.9 4.4 4.8 4.2 2.0 5 1.6 2.5

None........................................................ 62.3 3.3 16.6 14.7 9.0 5.0 4 4.4 6.4

Don't Know............................................... 4.7 0.5 2.1 1.0 0.5 0.0 2 Q Q

Thermostats

Do Not Have a Thermostat.......................... 15.3 2.4 5.7 2.7 1.5 0.0 6 0.3 0.3

Have a Thermostat...................................... 95.8 3.8 22.0 23.3 16.1 10.0 7.5 11.2

1............................................................... 84.5 3.3 20.6 21.5 14.5 8.0 8 5.8 8.4

2 or More................................................. 11.3 0.4 1.5 1.8 1.6 1.0 4 1.7 2.9

Have a Programmable Thermostat..........

Yes....................................................... 33.1 1.1 4.9 6.7 6.3 4.0 2 3.4 6.0

No........................................................ 62.7 2.7 17.1 16.6 9.8 5.0 9 4.1 5.2

Use of Programmable Thermostats

Reduces Temperature During Day

Yes....................................................... 18.6 0.4 2.6 3.7 3.7 2.0 6 1.9 3.6

No........................................................ 14.5 0.7 2.3 3.0 2.6 1.0 6 1.5 2.5

Reduces Temperature at Night

Yes....................................................... 21.5 0.5 2.9 4.4 4.2 3.0 0 2.1 4.1

No........................................................ 11.6 0.6 2.1 2.3 2.1 1.0 3 1.2 1.9

Winter 2005 Temperature Settings

Lower Temperature Settings

Daytime When No One is at Home

Yes....................................................... 40.5 1.4 8.9 9.6 7.3 4.0 6 3.4 4.9

No........................................................ 59.1 3.2 15.3 14.5 9.2 5.0 7 4.0 6.2

Unknown.............................................. 11.4 1.6 3.5 1.9 1.1 0.0 4 Q 0.4

During Sleeping Hours

Yes....................................................... 40.7 1.3 8.1 9.7 7.2 4.0 5 3.7 5.7

No........................................................ 60.2 3.4 16.4 14.7 9.5 5.0 8 3.8 5.6

Unknown.............................................. 10.2 1.4 3.2 1.6 0.9 0.0 3 Q Q

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
2,000 to

2,499

2,500 to

2,999

3,000

or More

Table HC1.3 Heated Floorspace Usage Indicators, 2005

Heated Floorspace (square feet)

Fewer

than 500

500 to

999

1,000 to 

1,499

Housing 

Units 

Usage Indicators (millions)

 Million U.S. Housing Units

1,500 to

1,999

Daytime Setting When No One is at Home

Heat Turned On....................................... 93.7 4.0 22.3 22.3 15.8 9.0 9 7.3 11.0

63 Degrees or Less.............................. 18.9 1.0 4.5 4.4 3.0 2.0 1.3 2.2

64 to 66 Degrees.................................. 17.4 0.6 3.9 3.8 3.6 2.0 0 1.2 2.2

67 to 69 Degrees.................................. 17.8 0.6 3.2 4.2 2.9 1.0 9 2.1 2.7

70 Degrees........................................... 16.0 0.7 4.8 3.6 2.2 1.0 6 1.0 1.9

71 to 73 Degrees.................................. 10.2 Q 2.5 2.7 1.6 1.0 3 0.8 1.1

74 Degrees or More.............................. 13.5 0.8 3.3 3.6 2.5 1.0 0.9 1.1

Don't Know/No Answer......................... 7.4 1.2 2.8 1.4 0.8 0.0 3 Q 0.4

Do Not Use Space Heating................... 1.3 N Q N Q N N N

Heat Turned Off....................................... 8.7 1.0 2.6 2.3 1.0 0.0 5 0.3 Q

Daytime Setting When Someone is at Home

Heat Turned On....................................... 101.5 4.8 24.9 24.4 16.8 10.0 5 7.5 11.4

63 Degrees or Less.............................. 4.1 0.4 1.4 0.8 0.7 0.0 3 Q 0.3

64 to 66 Degrees.................................. 8.2 0.4 1.9 2.2 1.2 1.0 0.5 1.0

67 to 69 Degrees.................................. 23.6 0.7 4.3 5.1 4.2 2.0 9 2.3 3.9

70 Degrees........................................... 24.6 1.3 6.6 6.0 3.8 2.0 4 1.5 2.6

71 to 73 Degrees.................................. 17.6 0.5 4.0 4.1 3.1 2.0 0 1.7 2.2

74 Degrees or More.............................. 23.2 1.4 6.7 6.3 3.9 1.0 8 1.3 1.5

Don't Know/No Answer......................... 6.0 1.0 2.4 1.3 0.5 Q Q Q

Do Not Use Space Heating................... 1.3 N Q N Q N N N

Heat Turned Off....................................... 2.3 0.4 0.5 0.4 QQQQ

Setting During Sleeping Hours

Heat Turned On....................................... 98.1 4.5 23.6 23.6 16.4 10.0 2 7.4 11.3

63 Degrees or Less.............................. 13.0 0.6 3.0 2.9 2.3 1.0 3 1.1 1.5

64 to 66 Degrees.................................. 18.4 0.8 3.8 4.3 3.3 2.0 0 1.5 2.7

67 to 69 Degrees.................................. 20.8 0.7 4.1 4.7 3.3 2.0 5 2.0 3.3

70 Degrees........................................... 18.5 0.9 5.7 4.2 2.9 1.0 8 1.1 1.7

71 to 73 Degrees.................................. 11.1 0.4 2.5 2.9 1.8 1.0 5 0.8 1.2

74 Degrees or More.............................. 16.3 1.1 4.6 4.5 2.9 1.0 0.9 0.9

Don't Know/No Answer......................... 6.4 1.0 2.5 1.4 0.6 Q Q Q

Do Not Use Space Heating................... 1.3 N Q N Q N N N

Heat Turned Off....................................... 5.4 0.7 1.6 1.1 0.6 Q Q Q

Secondary Heating

Use Any Secondary Heating Equipment..

Yes.......................................................... 34.9 1.1 6.7 7.3 6.2 4.0 3 3.1 5.8

No............................................................ 74.9 5.0 21.0 18.7 11.4 6.0 4 4.6 5.8

Proportion of Heat Provided by................

Secondary Heating Equipment.................

Close to One-Half.................................... 4.4 0.2 0.9 1.0 0.8 0.0 5 0.4 0.6

About One-Quarter................................... 5.8 0.3 1.1 1.0 0.9 0.0 8 0.7 0.9

Very Little or None................................... 24.7 0.5 4.7 5.3 4.5 3.0 0 2.1 4.3

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
2,000 to

2,499

2,500 to

2,999

3,000

or More

Table HC1.3 Heated Floorspace Usage Indicators, 2005

Heated Floorspace (square feet)

Fewer

than 500

500 to

999

1,000 to 

1,499

Housing 

Units 

Usage Indicators (millions)

 Million U.S. Housing Units

1,500 to

1,999

Type of Supplemental Heating Equipment Used

Heat Pump............................................... 0.6 Q N Q Q Q Q 0.4

Central Warm-Air Furnace....................... 2.3 Q 0.5 0.4 0.4 0.0 4 Q 0.4

Steam/Hot Water System........................ Q N N Q N Q Q Q

Built-in Electric Units................................ 2.2 Q 0.4 0.4 0.5 0.0 2 Q 0.4

Built-in Pipeless Furnace......................... 0.3 Q QQQQQN

Built-in Room Heaters.............................. 1.4 N 0.3 0.4 0.3 Q Q Q

Heating Stove.......................................... 2.1 N Q 0.4 0.6 0.0 3 Q 0.5

Portable Electric Heaters......................... 14.3 0.8 3.6 3.5 2.1 1.0 4 1.3 1.5

Portable Kerosene Heaters...................... 0.6 N QQQQQQ

Cooking Stove.......................................... 0.5 Q 0.3 Q Q Q N N

Fireplace.................................................. 10.5 Q 1.3 1.9 2.1 1.0 7 1.0 2.4

Fireplace Fuel

Wood....................................................... 6.9 Q 1.0 1.2 1.6 1.0 2 0.7 1.1

Natural Gas.............................................. 2.7 N 0.2 0.5 0.4 0.0 5 Q 0.8

Propane................................................... 0.9 N Q Q Q Q Q 0.4

Use of Gas Fireplace

During Winter Months

Most Days................................................ 1.2 N Q Q Q Q Q 0.5

About Once a Week................................. 1.3 N Q Q Q 0.0 3 Q 0.5

Less than 4 Times each Month................ 1.1 N Q Q 0.3 Q Q 0.3

Humidifier Use Each Year

Use a Humidifier.......................................... 14.2 0.3 2.7 2.3 2.4 2.0 1.4 2.9

1 to 3 Months Each Year.......................... 7.1 Q 1.5 1.3 1.1 1.0 0 0.7 1.2

4 to 6 Months Each Year.......................... 5.6 Q 1.0 0.8 1.0 0.0 9 0.5 1.3

7 to 9 Months Each Year.......................... 0.4 Q QQQQQQ

10 to 11 months....................................... Q N N Q N N Q Q

Turned on All Year Long.......................... 1.1 Q Q 0.3 QQQQ

Do Not Use a Humidifier.............................. 96.9 5.8 25.1 23.7 15.2 8.0 6 6.3 8.6

 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.

 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 49.2 15.1 15.6 11.1 7.0 5.2 8.0

Have Cooling Equipment............................... 93.3 31.3 15.1 15.6 11.1 7.0 5.2 8.0

Use Cooling Equipment................................ 91.4 30.4 14.6 15.4 11.1 6.9 5.2 7.9

Have Equipment But Do Not Use it............... 1.9 1.0 0.5 QQQQQ

Do Not Have Cooling Equipment................... 17.8 17.8 NNNNNN

Air-Conditioning Equipment1, 2

Central System............................................. 65.9 3.9 15.1 15.6 11.1 7.0 5.2 8.0

Without a Heat Pump................................ 53.5 3.5 12.9 12.7 8.6 5.5 4.2 6.2

With a Heat Pump..................................... 12.3 0.4 2.2 2.9 2.5 1.5 1.0 1.8

Window/Wall Units........................................ 28.9 27.5 0.5 Q 0.3 Q Q Q

1 Unit......................................................... 14.5 13.5 0.3 Q Q Q N Q

2 Units....................................................... 9.1 8.7 Q N Q N Q Q

3 or More Units.......................................... 5.4 5.3 N Q Q Q N Q

Central Air-Conditioning Usage During 2005

Among Housing Units with Central Systems

Number of Rooms Air-Conditioned

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

1................................................................ 0.7 Q 0.3 Q N Q N N

2................................................................ 2.1 1.0 0.8 Q Q Q N N

3................................................................ 7.5 1.5 4.4 1.2 QQQQ

4................................................................ 7.9 0.4 4.0 2.6 0.6 Q Q Q

5 or More................................................... 46.3 Q 5.0 11.4 10.4 6.6 5.1 7.7

Proportion of Rooms Air-Conditioned

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

Some, But Not All of the Rooms................ 8.4 2.5 3.6 1.5 0.3 Q Q Q

All of the Rooms........................................ 56.1 1.0 11.0 14.0 10.8 6.6 5.1 7.7

Frequency Central Air-Conditioner Used

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

Only a Few Times..................................... 11.4 0.9 3.1 2.5 1.7 1.2 0.9 1.0

Quite a Bit................................................. 12.6 0.6 2.9 3.0 2.3 1.2 0.8 1.8

All Summer............................................... 40.5 1.8 8.6 9.9 7.1 4.5 3.5 5.1

At Home Behavior

Home Used for Business

Yes........................................................ 6.4 0.3 1.0 1.1 1.1 0.8 0.5 1.5

No.......................................................... 59.5 3.6 14.0 14.5 10.1 6.2 4.7 6.5

Someone Home All Day

Yes........................................................ 32.7 1.8 6.8 8.6 5.7 3.3 2.8 3.8

No.......................................................... 33.1 2.1 8.3 7.0 5.5 3.7 2.4 4.2

2,500 to

2,999

3,000

or More

Table HC1.4 Cooled Floorspace Usage Indicators, 2005

Housing 

Units 

Usage Indicators (millions)

 Million U.S. Housing Units

Cooled Floorspace (square feet)

Fewer

than 500

500 to

999

1,000 to 

1,499

1,500 to

1,999

2,000 to

2,499

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
2,500 to

2,999

3,000

or More

Table HC1.4 Cooled Floorspace Usage Indicators, 2005

Housing 

Units 

Usage Indicators (millions)

 Million U.S. Housing Units

Cooled Floorspace (square feet)

Fewer

than 500

500 to

999

1,000 to 

1,499

1,500 to

1,999

2,000 to

2,499

Housing Unit Characteristics Affecting Usage

Among Units Using Central Air-Conditioning

Climate Zone3

Less than 2,000 CDD and--

Greater than 7,000 HDD........................ 4.8 Q 0.7 0.8 0.7 0.8 0.5 1.1

5,500 to 7,000 HDD............................... 12.3 0.7 2.6 2.7 2.2 1.2 1.1 1.9

4,000 to 5,499 HDD............................... 15.1 0.6 2.8 3.3 2.4 1.9 1.4 2.6

Less than 4,000 HDD............................. 14.9 1.2 4.3 4.0 2.1 1.3 1.0 1.2

2000 CDD or More and--

Less than 4,000 HDD............................. 18.7 1.2 4.7 4.8 3.8 1.8 1.2 1.2

Large Tree(s) that Shade the Home

Yes............................................................ 31.6 1.8 6.4 7.4 5.7 3.5 2.5 4.4

No............................................................. 34.3 2.1 8.7 8.1 5.4 3.5 2.7 3.7

Adequacy of Insulation

Well Insulated............................................ 29.5 1.5 6.2 6.2 5.1 3.6 2.5 4.5

Adequately Insulated................................. 27.9 1.7 6.2 7.1 4.8 2.8 2.3 3.0

Poorly Insulated......................................... 7.3 0.6 2.3 1.8 1.2 0.5 0.4 0.5

No Insulation............................................. 0.3 QQQQNNN

Don’t Know................................................ 0.9 Q 0.3 0.3 QQQQ

Home is Too Drafty During the Winter

Never......................................................... 42.6 2.5 9.3 9.9 7.7 4.7 3.0 5.5

Some of the Time...................................... 16.3 0.9 3.7 3.9 2.6 1.6 1.6 1.9

Most of the Time....................................... 2.5 0.2 0.5 0.7 0.4 Q Q 0.3

All of the Time........................................... 2.2 0.3 0.8 0.5 QQQQ

Don’t Know................................................ 2.2 Q 0.7 0.5 Q 0.3 Q Q

Unusually High Ceilings

Yes............................................................ 20.3 0.7 3.3 2.9 3.7 3.2 2.3 4.3

No............................................................. 41.9 2.7 10.3 11.3 7.3 3.7 2.9 3.7

Not Asked (Mobile Homes)........................ 3.7 0.5 1.5 1.3 Q Q Q N

Cathedral Ceilings

(In Housing Units with High Ceilings)

Yes.................................................... 13.5 0.5 2.2 1.8 2.5 2.2 1.4 3.0

No...................................................... 6.7 Q 1.1 1.1 1.2 0.9 0.9 1.2

Type of Glass in Windows

Single-pane Glass..................................... 27.4 2.4 8.1 7.4 4.3 2.3 1.3 1.6

Double-pane Glass

Without Low-e Coating........................... 31.5 1.1 6.2 7.2 5.4 3.6 3.1 4.9

With Low-e Coating............................... 5.8 0.4 0.7 0.8 1.1 1.0 0.7 1.1

Triple-pane Glass

Without Low-e Coating........................... 0.8 QQQQQQQ

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

Proportion of Original Windows Replaced

All.............................................................. 11.5 0.5 2.1 2.9 2.3 1.3 1.0 1.5

Some......................................................... 11.1 0.8 2.2 2.3 2.2 1.3 0.9 1.4

None......................................................... 40.9 2.5 9.8 9.7 6.4 4.2 3.3 5.0

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
2,500 to

2,999

3,000

or More

Table HC1.4 Cooled Floorspace Usage Indicators, 2005

Housing 

Units 

Usage Indicators (millions)

 Million U.S. Housing Units

Cooled Floorspace (square feet)

Fewer

than 500

500 to

999

1,000 to 

1,499

1,500 to

1,999

2,000 to

2,499

Thermostats

Thermostat Available During Summer

Yes............................................................ 63.9 3.5 14.6 15.2 10.8 6.8 5.1 7.8

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

Have a Programmable Thermostat.........

Yes........................................................ 25.0 1.2 4.6 5.2 4.9 2.8 2.2 4.2

No.......................................................... 38.9 2.3 10.0 10.0 6.0 4.1 2.9 3.6

Use of Programmable Thermostats

Reduces Temperature During Day

Yes........................................................ 15.1 0.7 2.6 3.4 3.0 1.7 1.2 2.6

No.......................................................... 9.9 0.5 2.0 1.8 1.9 1.1 1.0 1.6

Reduces Temperature at Night

Yes........................................................ 15.4 0.7 2.8 3.2 3.0 1.9 1.3 2.7

No.......................................................... 9.6 0.5 1.8 2.0 1.9 0.9 1.0 1.5

Do Not Use Central Air-Conditioning...... 45.2 45.2 NNNNNN

Summer 2005 Temperature Settings

Higher Temperature Settings

Daytime When No One is at Home

Yes........................................................ 0.5 QQQQQNQ

No.......................................................... 50.8 2.3 10.7 12.4 9.1 5.5 4.2 6.7

Unknown................................................ 14.5 1.6 4.2 3.1 1.9 1.4 1.0 1.3

Do Not Use Central Air-Conditioning...... 45.2 45.2 NNNNNN

During Sleeping Hours

Yes........................................................ 7.3 0.3 1.3 1.6 1.4 1.0 0.7 1.0

No.......................................................... 44.3 2.0 9.7 10.9 7.8 4.6 3.5 5.8

Unknown................................................ 14.2 1.6 4.1 3.0 1.9 1.4 1.0 1.2

Do Not Use Central Air-Conditioning...... 45.2 45.2 NNNNNN

Daytime Setting When Someone is at Home

Air Conditioner Turned On......................... 52.0 2.4 11.1 12.6 9.3 5.7 4.2 6.8

69 Degrees or Less............................... 4.8 Q 1.4 1.2 0.8 0.4 0.5 0.3

70 Degrees............................................ 7.2 0.3 1.6 1.8 1.3 0.7 0.7 0.7

71 to 73 Degrees................................... 8.8 0.4 1.8 1.7 1.2 1.0 1.1 1.6

74 to 76 Degrees................................... 16.5 0.7 3.5 4.3 3.0 1.8 0.9 2.3

77 to 79 Degrees................................... 11.1 0.6 2.0 2.7 2.4 1.3 0.9 1.3

80 Degrees or More............................... 3.7 0.3 0.8 0.8 0.6 0.4 Q 0.6

Don't Know/No Answer.......................... 1.1 Q 0.4 0.4 QQQQ

Do Not Use Central Air Conditioning......... 45.2 45.2 NNNNNN

Setting When No One is at Home

Air Conditioner Turned On......................... 49.5 2.3 10.0 12.1 9.1 5.4 4.1 6.6

69 Degrees or Less............................... 3.6 Q 1.1 0.9 0.6 0.3 0.3 0.3

70 Degrees............................................ 5.2 0.3 1.1 1.4 0.8 0.5 0.5 0.5

71 to 73 Degrees................................... 6.0 Q 1.2 1.3 1.0 0.8 0.6 1.0

74 to 76 Degrees................................... 13.8 0.7 2.6 3.8 2.4 1.3 1.1 1.9

77 to 79 Degrees................................... 10.7 0.4 1.8 2.4 2.5 1.3 0.8 1.5

80 Degrees or More............................... 10.2 0.6 2.2 2.3 1.9 1.2 0.7 1.3

Don't Know/No Answer.......................... 1.6 Q 0.6 0.5 QQQQ

Air-Conditioner Turned Off......................... 2.0 Q 0.8 0.4 QQQQ

Do Not Use Central Air Conditioning......... 45.2 45.2 NNNNNN

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
2,500 to

2,999

3,000

or More

Table HC1.4 Cooled Floorspace Usage Indicators, 2005

Housing 

Units 

Usage Indicators (millions)

 Million U.S. Housing Units

Cooled Floorspace (square feet)

Fewer

than 500

500 to

999

1,000 to 

1,499

1,500 to

1,999

2,000 to

2,499

Setting During Sleeping Hours

Air Conditioner Turned On......................... 51.0 2.3 10.7 12.4 9.2 5.6 4.1 6.7

69 Degrees or Less............................... 5.7 Q 1.6 1.4 1.1 0.5 0.5 0.5

70 Degrees............................................ 7.7 0.4 1.8 2.1 1.3 0.7 0.7 0.7

71 to 73 Degrees................................... 8.3 0.3 1.7 1.7 1.2 1.0 0.9 1.5

74 to 76 Degrees................................... 15.5 0.8 3.1 3.6 2.8 1.8 1.1 2.1

77 to 79 Degrees................................... 9.7 0.4 1.7 2.4 2.0 1.2 0.7 1.2

80 Degrees or More............................... 4.1 Q 0.8 1.2 0.7 0.4 Q 0.6

Don't Know/No Answer.......................... 1.3 Q 0.4 0.3 QQQQ

Air-Conditioner Turned Off......................... 0.8 Q 0.3 QQQQQ

Do Not Use Central Air Conditioning......... 45.2 45.2 NNNNNN

Dehumidifier Use Each Year

Use a Humidifier........................................... 13.3 4.7 1.2 1.5 1.4 1.3 1.3 2.0

1 to 3 Months Each Year........................... 5.1 2.0 0.5 0.6 0.4 0.5 0.5 0.6

4 to 6 Months Each Year........................... 4.4 1.6 0.5 0.5 0.4 0.5 0.4 0.6

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

10 to 11 months........................................ Q Q NNNNQQ

Turned on All Year Long............................ 2.6 0.8 Q 0.3 0.3 Q Q 0.5

Do Not Use a Dehumidifier............................ 97.8 44.5 13.8 14.1 9.8 5.7 3.9 6.0

Window/Wall Air Conditioners

Window/Wall Air-Conditioning Use

Never......................................................... 0.6 0.5 QQQQNN

Only a Few Times..................................... 12.1 11.5 QQQQNQ

Quite a Bit................................................. 7.5 7.1 QQQQQQ

All Summer............................................... 8.6 8.3 Q N Q Q N Q

Energy Star Wall/Window (Most-Used) Unit

Yes............................................................ 4.6 4.2 QQQQNQ

No............................................................. 2.7 2.4 QQQQQQ

Don't Know................................................ 7.0 6.9 Q NNNNN

Unit is More Than 4 Years Old.................. 14.6 13.9 QQQQNQ

Swamp Cooler (Asked Only In Arid Areas)

Yes............................................................... 3.4 2.7 QQQQNQ

No................................................................. 41.9 17.2 7.4 6.3 4.6 2.5 1.9 2.0

Not Asked..................................................... 65.8 29.3 7.5 9.1 6.4 4.4 3.3 5.9

 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-conditioning fuel was electricity.

 3. One of five climatically distinct areas, determined according to the 30-year average (1971-2000) of the annual heating and cooling degreedays. A household is assigned to a climate zone according to the 30-year average annual degree-days for an appropriate nearby weather station.

 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