Total............................................................... 111.1 100.0 256.5 100.0 179.8 100.0 114.5 100.0

Census Region and Division

Northeast.................................................... 20.6 18.5 49.9 19.4 34.2 19.0 11.6 10.1

New England........................................... 5.5 4.9 13.9 5.4 9.2 5.1 1.4 1.3

Middle Atlantic......................................... 15.1 13.6 35.9 14.0 25.1 13.9 10.1 8.8

Midwest....................................................... 25.6 23.0 65.7 25.6 49.4 27.4 34.8 30.4

East North Central................................... 17.7 16.0 46.6 18.2 34.2 19.0 22.5 19.7

West North Central.................................. 7.9 7.1 19.0 7.4 15.2 8.4 12.3 10.7

South.......................................................... 40.7 36.6 93.4 36.4 63.1 35.1 52.7 46.0

South Atlantic.......................................... 21.7 19.5 51.4 20.0 34.9 19.4 29.5 25.7

East South Central.................................. 6.9 6.2 15.5 6.1 10.6 5.9 8.5 7.5

West South Central................................. 12.1 10.9 26.5 10.3 17.6 9.8 14.7 12.8

West........................................................... 24.2 21.8 47.5 18.5 33.1 18.4 15.4 13.5

Mountain................................................. 7.6 6.8 16.2 6.3 12.5 6.9 6.1 5.4

Pacific..................................................... 16.6 15.0 31.2 12.2 20.6 11.5 9.3 8.1

Urban/Rural Location (Self-Reported)

City............................................................. 47.1 42.4 89.0 34.7 61.7 34.3 37.8 33.0

Town........................................................... 19.0 17.1 43.4 16.9 30.1 16.8 17.7 15.4

Suburbs...................................................... 22.7 20.4 66.1 25.8 45.8 25.5 33.4 29.2

Rural........................................................... 22.3 20.1 58.0 22.6 42.1 23.4 25.7 22.4

Climate Zone1

Less than 2,000 CDD and--

Greater than 7,000 HDD.......................... 10.9 9.8 29.4 11.5 22.6 12.6 10.7 9.3

5,500 to 7,000 HDD................................. 26.1 23.5 64.3 25.1 45.0 25.0 22.8 19.9

4,000 to 5,499 HDD................................. 27.3 24.6 63.2 24.6 47.4 26.3 29.5 25.8

Less than 4,000 HDD.............................. 24.0 21.6 50.9 19.8 33.0 18.3 22.7 19.8

2000 CDD or More and--

Less than 4,000 HDD.............................. 22.8 20.5 48.7 19.0 31.9 17.7 28.8 25.2

Type of Housing Unit

Single-Family Detached.......................... 72.1 64.9 210.3 82.0 142.0 79.0 94.4 82.5

Single-Family Attached........................... 7.6 6.8 15.7 6.1 11.2 6.2 6.2 5.4

Apartments in 2-4 Unit Buildings............. 7.8 7.0 8.5 3.3 7.0 3.9 2.6 2.3

Apartments in 5 or More Unit Buildings... 16.7 15.1 14.6 5.7 13.0 7.3 7.4 6.5

Mobile Homes......................................... 6.9 6.3 7.4 2.9 6.6 3.6 3.8 3.4

Ownership of Unit

Owned........................................................ 78.1 70.3 216.1 84.3 148.6 82.6 99.8 87.2

Single-Family Detached.......................... 64.1 57.7 193.5 75.4 130.6 72.6 89.1 77.8

Single-Family Attached........................... 4.2 3.7 10.8 4.2 7.7 4.3 4.6 4.0

Apartments in 2-4 Unit Buildings............. 1.8 1.7 2.9 1.1 2.4 1.3 0.8 0.7

Apartments in 5 or More Unit Buildings... 2.3 2.1 2.6 1.0 2.2 1.2 1.9 1.7

Mobile Homes......................................... 5.7 5.2 6.3 2.5 5.7 3.2 3.4 3.0

Rented........................................................ 33.0 29.7 40.3 15.7 31.2 17.4 14.7 12.8

Single-Family Detached.......................... 8.0 7.2 16.8 6.6 11.4 6.3 5.3 4.6

Single-Family Attached........................... 3.4 3.1 5.0 1.9 3.6 2.0 1.7 1.5

Apartments in 2-4 Unit Buildings............. 5.9 5.3 5.5 2.1 4.6 2.5 1.8 1.6

Apartments in 5 or More Unit Buildings... 14.4 13.0 12.0 4.7 10.9 6.1 5.5 4.8

Mobile Homes......................................... 1.2 1.1 1.0 0.4 0.9 0.5 0.4 0.4

Table HC1.1.1 Housing Unit Characteristics by

 Total, Heated, and Cooled Floorspace, 2005

Millions Percent Billions Percent Billions Percent Billions Percent

Total Square Footage

Housing Unit Characteristics

Housing Units Total Heated Cooled

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC1.1.1 Housing Unit Characteristics by

 Total, Heated, and Cooled Floorspace, 2005

Millions Percent Billions Percent Billions Percent Billions Percent

Total Square Footage

Housing Unit Characteristics

Housing Units Total Heated Cooled

Year of Construction

Before 1940................................................ 14.7 13.2 34.6 13.5 23.3 13.0 6.9 6.1

1940 to 1949............................................... 7.4 6.7 15.7 6.1 10.8 6.0 4.2 3.6

1950 to 1959............................................... 12.5 11.3 26.9 10.5 18.3 10.2 9.5 8.3

1960 to 1969............................................... 12.5 11.2 26.0 10.2 18.3 10.2 11.3 9.9

1970 to 1979............................................... 18.9 17.0 37.6 14.6 26.5 14.8 17.3 15.1

1980 to 1989............................................... 18.6 16.7 40.0 15.6 29.2 16.2 21.4 18.7

1990 to 1999............................................... 17.3 15.6 47.1 18.4 34.0 18.9 26.9 23.5

2000 to 2005............................................... 9.2 8.3 28.5 11.1 19.5 10.8 17.1 14.9

Number of Stories in

Single-Family Homes

1 Story........................................................ 46.7 42.0 110.0 42.9 71.0 39.5 49.2 43.0

2 Stories..................................................... 28.0 25.2 96.8 37.7 67.4 37.5 42.5 37.1

3 or More Stories........................................ 2.5 2.3 10.5 4.1 7.8 4.3 4.0 3.5

Split-level.................................................... 1.9 1.8 7.2 2.8 5.9 3.3 4.2 3.7

Other........................................................... 0.5 0.4 1.4 0.6 1.1 0.6 0.7 0.6

Not Asked................................................... 31.4 28.3 30.4 11.9 26.6 14.8 13.9 12.1

Number of Floors in Apartment

Buildings with 5 or More Units

1 or 2 Floors................................................ 8.2 7.4 7.2 2.8 6.3 3.5 3.7 3.2

3 or 4 Floors................................................ 6.0 5.4 5.2 2.0 4.8 2.6 2.7 2.3

5 to 10 Floors.............................................. 1.6 1.4 1.3 0.5 1.2 0.6 0.5 0.4

11 to 20 Floors............................................ 0.6 0.5 0.5 0.2 QQQQ

More than 20 Floors.................................... Q QQQQQQQ

Not Asked................................................... 94.4 84.9 241.9 94.3 166.7 92.7 107.2 93.6

Major Outside Wall Construction

Siding (Aluminum, Vinyl, Steel)................... 35.3 31.8 82.8 32.3 59.7 33.2 37.7 32.9

Brick............................................................ 31.3 28.2 73.5 28.7 52.3 29.1 36.7 32.0

Wood.......................................................... 20.0 18.0 47.8 18.6 33.0 18.4 16.5 14.4

Stucco......................................................... 14.8 13.3 29.6 11.5 19.8 11.0 12.7 11.1

Concrete/Concrete Block............................ 5.3 4.8 10.4 4.1 6.7 3.7 6.3 5.5

Composition (Shingle)................................. 1.9 1.7 4.7 1.8 2.9 1.6 1.3 1.1

Stone.......................................................... 1.0 0.9 3.7 1.4 2.4 1.3 1.6 1.4

Other........................................................... 1.5 1.4 4.0 1.6 3.0 1.7 1.7 1.5

Foundation/Basement of SingleFamily Units and Apartments in

2 to 4 Unit Buildings

(more than one may apply)

Basement................................................... 35.5 31.9 118.6 46.2 81.6 45.4 47.7 41.7

Crawlspace................................................. 25.1 22.6 62.9 24.5 42.9 23.9 25.0 21.9

Concrete Slab............................................. 40.2 36.2 104.2 40.6 69.7 38.8 52.2 45.6

Not Asked (Mobile Homes and

Apartments in Buildings

With 5 or More Units).............................. 23.7 21.3 22.0 8.6 19.6 10.9 11.2 9.8

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC1.1.1 Housing Unit Characteristics by

 Total, Heated, and Cooled Floorspace, 2005

Millions Percent Billions Percent Billions Percent Billions Percent

Total Square Footage

Housing Unit Characteristics

Housing Units Total Heated Cooled

Fuels Used for Any Use

(more than one may apply)

Electricity.................................................... 111.1 100.0 256.5 100.0 179.8 100.0 114.5 100.0

Natural Gas................................................. 69.5 62.5 166.8 65.0 117.2 65.2 75.0 65.5

Wood.......................................................... 14.4 13.0 43.5 17.0 30.6 17.0 19.1 16.7

Fuel Oil....................................................... 8.4 7.6 23.6 9.2 15.5 8.6 3.3 2.8

LPG............................................................ 12.6 11.3 34.8 13.6 24.6 13.7 15.0 13.1

Kerosene.................................................... 1.7 1.5 3.5 1.4 2.4 1.3 0.9 0.8

Solar........................................................... 0.2 0.2 0.6 0.2 0.4 0.2 Q Q

Main Heating Fuel

Natural Gas................................................. 58.2 52.4 141.4 55.1 99.6 55.4 63.7 55.7

Electricity.................................................... 33.7 30.3 67.9 26.5 48.1 26.8 38.5 33.6

Fuel Oil....................................................... 7.7 6.9 21.7 8.5 14.4 8.0 3.0 2.6

LPG............................................................ 6.0 5.4 14.5 5.7 10.8 6.0 6.8 6.0

Wood.......................................................... 2.9 2.6 7.2 2.8 5.4 3.0 2.0 1.7

Kerosene.................................................... 0.7 0.6 1.1 0.4 0.7 0.4 Q Q

Solar........................................................... Q QQQQQQQ

Other........................................................... Q QQQQQQQ

None........................................................... 1.3 1.1 1.5 0.6 QQQQ

Natural Gas Available

in Neighborhood

Yes............................................................. 80.5 72.5 188.6 73.5 132.5 73.7 84.0 73.4

Actually Use Natural Gas........................ 69.5 62.5 166.8 65.0 117.2 65.2 75.0 65.5

Do Not Use Natural Gas.......................... 11.1 10.0 21.8 8.5 15.3 8.5 9.0 7.9

No............................................................... 30.6 27.5 67.9 26.5 47.3 26.3 30.5 26.7

 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 2,171 1,618 1,031 845 630 401

Census Region and Division

Northeast................................................... 20.6 2,334 1,664 562 911 649 220

New England.......................................... 5.5 2,472 1,680 265 1,057 719 113

Middle Atlantic........................................ 15.1 2,284 1,658 670 864 627 254

Midwest...................................................... 25.6 2,421 1,927 1,360 981 781 551

East North Central.................................. 17.7 2,483 1,926 1,269 999 775 510

West North Central................................. 7.9 2,281 1,930 1,566 940 796 646

South.......................................................... 40.7 2,161 1,551 1,295 856 615 513

South Atlantic......................................... 21.7 2,243 1,607 1,359 896 642 543

East South Central................................. 6.9 2,137 1,544 1,238 884 638 512

West South Central................................ 12.1 2,028 1,455 1,211 774 555 462

West........................................................... 24.2 1,784 1,366 638 647 496 231

Mountain................................................. 7.6 1,951 1,649 811 732 619 304

Pacific..................................................... 16.6 1,708 1,238 559 610 442 200

Urban/Rural Location (Self-Reported)

City............................................................. 47.1 1,781 1,309 802 704 518 317

Town.......................................................... 19.0 2,167 1,588 931 841 617 362

Suburbs...................................................... 22.7 2,688 2,023 1,475 997 751 547

Rural.......................................................... 22.3 2,472 1,886 1,148 982 749 456

Climate Zone2

Less than 2,000 CDD and--

Greater than 7,000 HDD......................... 10.9 2,534 2,065 977 1,019 830 393

5,500 to 7,000 HDD................................ 26.1 2,346 1,726 876 937 689 350

4,000 to 5,499 HDD................................ 27.3 2,205 1,735 1,081 848 667 416

Less than 4,000 HDD............................. 24.0 1,966 1,375 945 752 526 362

2000 CDD or More and--

Less than 4,000 HDD............................. 22.8 1,971 1,398 1,265 759 539 487

Type of Housing Unit

Single-Family Detached.......................... 72.1 2,720 1,970 1,310 998 723 481

Single-Family Attached........................... 7.6 1,941 1,475 821 783 596 331

Apartments in 2-4 Unit Buildings............. 7.8 1,090 902 341 451 373 141

Apartments in 5 or More Unit Buildings... 16.7 872 780 441 427 382 216

Mobile Homes......................................... 6.9 1,059 944 554 429 382 224

Ownership of Housing Unit

Owned....................................................... 78.1 2,586 1,902 1,278 997 733 493

Single-Family Detached.......................... 64.1 2,813 2,039 1,392 1,053 763 521

Single-Family Attached........................... 4.2 2,400 1,837 1,094 1,017 778 464

Apartments in 2-4 Unit Buildings............. 1.8 1,604 1,320 458 718 591 205

Apartments in 5 or More Unit Buildings... 2.3 1,116 940 829 676 570 502

Mobile Homes......................................... 5.7 1,099 990 593 460 414 248

Rented....................................................... 33.0 1,188 947 445 473 378 178

Single-Family Detached.......................... 8.0 1,983 1,419 661 626 448 209

Single-Family Attached........................... 3.4 1,383 1,037 488 528 396 186

Apartments in 2-4 Unit Buildings............. 5.9 930 772 305 376 312 123

Apartments in 5 or More Unit Buildings... 14.4 833 754 379 396 359 181

Mobile Homes......................................... 1.2 866 722 367 305 254 129

Household Member

Average Square Feet per--

Table HC1.1.2 Housing Unit Characteristics by Average Floorspace, 2005 

Total1 Heated Cooled Total Heated Cooled

 Housing 

Units 

(millions)

Housing Unit

Housing Unit Characteristics

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Household Member

Average Square Feet per--

Table HC1.1.2 Housing Unit Characteristics by Average Floorspace, 2005 

Total1 Heated Cooled Total Heated Cooled

 Housing 

Units 

(millions)

Housing Unit

Housing Unit Characteristics

Year of Construction

Before 1940................................................ 14.7 2,325 1,586 473 945 644 192

1940 to 1949.............................................. 7.4 2,047 1,456 564 840 598 231

1950 to 1959.............................................. 12.5 2,052 1,458 761 845 600 313

1960 to 1969.............................................. 12.5 1,969 1,470 906 745 556 343

1970 to 1979.............................................. 18.9 1,863 1,404 914 749 565 368

1980 to 1989.............................................. 18.6 1,992 1,569 1,152 791 623 458

1990 to 1999.............................................. 17.3 2,501 1,959 1,549 892 698 552

2000 to 2005.............................................. 9.2 2,827 2,117 1,851 1,023 766 670

Number of Stories in

Single-Family Homes

1 Story........................................................ 46.7 2,178 1,520 1,054 864 602 418

2 Stories..................................................... 28.0 3,248 2,409 1,518 1,105 820 516

3 or More Stories........................................ 2.5 3,998 3,105 1,606 1,255 975 504

Split-level................................................... 1.9 3,447 3,028 2,177 1,120 984 708

Other.......................................................... 0.5 2,712 2,223 1,404 1,101 903 570

Not Asked.................................................. 31.4 967 846 441 434 380 198

Number of Floors in Apartment

Buildings with 5 or More Units

1 or 2 Floors............................................... 8.2 875 772 448 426 376 218

3 or 4 Floors............................................... 6.0 875 800 448 409 375 210

5 to 10 Floors............................................. 1.6 796 729 285 438 401 157

11 to 20 Floors........................................... 0.6 898 761 Q 436 369 Q

More than 20 Floors................................... Q 1,009 862 938 873 745 811

Not Asked.................................................. 94.4 2,401 1,767 1,136 902 664 427

Major Outside Wall Construction

Siding (Aluminum, Vinyl, Steel).................. 35.3 2,227 1,691 1,068 847 643 406

Brick........................................................... 31.3 2,213 1,670 1,172 903 681 478

Wood......................................................... 20.0 2,269 1,651 826 886 645 323

Stucco........................................................ 14.8 1,794 1,338 858 652 486 312

Concrete/Concrete Block............................ 5.3 1,811 1,267 1,199 754 527 499

Composition (Shingle)................................ 1.9 2,366 1,545 678 887 579 254

Stone.......................................................... 1.0 3,551 2,416 1,608 1,418 965 642

Other.......................................................... 1.5 2,500 1,966 1,143 1,035 814 473

Foundation/Basement of SingleFamily Units and Apartments in

2 to 4 Unit Buildings

(more than one may apply)

Basement................................................... 35.5 3,177 2,301 1,345 1,185 859 502

Crawlspace................................................ 25.1 2,372 1,711 999 927 669 390

Concrete Slab............................................ 40.2 2,364 1,734 1,299 845 620 464

Not Asked (Mobile Homes and

Apartments in Buildings

With 5 or More Units).............................. 23.7 926 828 474 428 382 219

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Household Member

Average Square Feet per--

Table HC1.1.2 Housing Unit Characteristics by Average Floorspace, 2005 

Total1 Heated Cooled Total Heated Cooled

 Housing 

Units 

(millions)

Housing Unit

Housing Unit Characteristics

Fuels Used for Any Use

(more than one may apply)

Electricity.................................................... 111.1 2,171 1,618 1,031 845 630 401

Natural Gas................................................ 69.5 2,246 1,688 1,080 852 640 409

Wood......................................................... 14.4 2,822 2,117 1,325 1,066 799 500

Fuel Oil....................................................... 8.4 2,693 1,840 386 1,067 729 153

LPG............................................................ 12.6 2,631 1,960 1,197 1,003 747 456

Kerosene.................................................... 1.7 2,036 1,423 564 882 616 244

Solar........................................................... 0.2 2,132 1,570 Q 820 603 Q

Main Heating Fuel

Natural Gas................................................ 58.2 2,273 1,712 1,095 873 658 421

Electricity.................................................... 33.7 1,885 1,429 1,142 745 565 451

Fuel Oil....................................................... 7.7 2,714 1,865 387 1,091 750 156

LPG............................................................ 6.0 2,307 1,795 1,131 920 716 451

Wood......................................................... 2.9 2,397 1,853 685 878 679 251

Kerosene.................................................... 0.7 1,542 966 Q 803 504 Q

Solar........................................................... QQQQQQQ

Other ......................................................... QQQQQQQ

None.......................................................... 1.3 1,175 Q Q 418 Q Q

Natural Gas Available

in Neighborhood

Yes............................................................. 80.5 2,194 1,645 1,043 844 633 401

Actually Use Natural Gas........................ 69.5 2,246 1,688 1,080 852 640 409

Do Not Use Natural Gas......................... 11.1 1,867 1,379 814 791 584 345

No.............................................................. 30.6 2,111 1,548 999 848 622 401

 1. Excludes floorspace in unheated garages. The total average square footage per housing unit for the 2001 RECS was reported as 

1,975 square feet. This figure excluded unheated garages and for most housing units, living space in attics. The average total square 

footage for housing units in the 2005 RECS, reported in this table is 2,171 square feet, includes attic living space for all housing units. The 

only available figures that permit comparison of total square footage for both survey years would exclude all garage floorspace and attic 

floorspace in all housing units--for 2001 the total square footage was 2,005 and for 2005 the total was 2,029 square feet.

 2. 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 86.6 2,720 1,970 1,310 1,941 1,475 821 1,059 944 554

Census Region and Division

Northeast.................................... 20.6 13.9 3,224 2,173 836 2,219 1,619 583 903 830 Q

New England.......................... 5.5 3.6 3,365 2,154 313 2,634 1,826 Q 951 940 Q

Middle Atlantic........................ 15.1 10.3 3,167 2,181 1,049 2,188 1,603 582 Q Q Q

Midwest...................................... 25.6 21.0 2,823 2,239 1,624 2,356 1,669 1,336 1,081 961 778

East North Central.................. 17.7 14.5 2,864 2,217 1,490 2,514 1,715 1,408 907 839 553

West North Central................. 7.9 6.4 2,729 2,289 1,924 1,806 1,510 1,085 1,299 1,113 1,059

South.......................................... 40.7 33.0 2,707 1,849 1,563 1,605 1,350 954 1,064 970 685

South Atlantic......................... 21.7 16.8 2,945 1,996 1,695 1,573 1,359 909 1,044 955 733

East South Central.................. 6.9 6.2 2,490 1,731 1,432 1,414 1,272 921 1,082 1,012 737

West South Central................ 12.1 10.0 2,465 1,690 1,434 1,820 1,358 Q 1,087 968 566

West........................................... 24.2 18.8 2,242 1,705 816 1,609 1,270 550 1,074 913 280

Mountain................................. 7.6 6.6 2,308 1,931 977 2,123 1,767 890 1,097 944 215

Pacific..................................... 16.6 12.2 2,209 1,591 735 1,328 998 364 1,054 885 339

Urban/Rural Location (Self-Reported)

City............................................. 47.1 30.8 2,395 1,679 1,133 1,878 1,401 716 960 786 401

Town.......................................... 19.0 14.9 2,634 1,880 1,124 2,081 1,430 806 1,025 948 558

Suburbs...................................... 22.7 19.2 3,160 2,320 1,740 1,908 1,629 1,026 1,038 980 630

Rural.......................................... 22.3 21.7 2,805 2,098 1,276 Q Q Q 1,118 1,016 616

Climate Zone2

Less than 2,000 CDD and--

Greater than 7,000 HDD......... 10.9 9.6 2,908 2,351 1,139 2,392 1,880 961 1,191 1,106 Q

5,500 to 7,000 HDD................ 26.1 19.8 2,948 2,114 1,135 2,424 1,613 955 1,011 956 303

4,000 to 5,499 HDD................ 27.3 20.2 2,879 2,195 1,513 1,898 1,574 808 1,085 1,012 560

Less than 4,000 HDD.............. 24.0 18.9 2,506 1,689 1,187 1,318 1,049 486 986 851 575

2000 CDD or More and--

Less than 4,000 HDD.............. 22.8 18.2 2,425 1,662 1,495 1,583 1,212 1,072 1,092 923 745

Ownership of Housing Unit

Owned........................................ 78.1 74.0 2,813 2,039 1,392 2,400 1,837 1,094 1,099 990 593

Rented........................................ 33.0 12.6 1,983 1,419 661 1,383 1,037 488 866 722 367

Year of Construction

Before 1940................................ 14.7 10.9 2,855 1,878 663 2,244 1,523 QQQQ

1940 to 1949.............................. 7.4 6.0 2,297 1,578 698 2,157 1,694 Q N N N

1950 to 1959.............................. 12.5 10.9 2,260 1,582 885 1,947 1,411 QQQQ

1960 to 1969.............................. 12.5 9.5 2,399 1,756 1,139 1,826 1,325 Q 760 542 Q

1970 to 1979.............................. 18.9 13.7 2,593 1,889 1,280 1,532 1,181 822 948 809 355

1980 to 1989.............................. 18.6 13.7 2,731 2,052 1,569 1,958 1,604 1,012 1,008 933 494

1990 to 1999.............................. 17.3 14.3 3,140 2,408 1,925 1,943 1,559 1,187 1,232 1,143 837

2000 to 2005.............................. 9.2 7.6 3,440 2,542 2,233 2,213 1,575 1,365 1,425 1,336 1,120

Total1 Total1

Table HC1.1.3 Housing Unit Characteristics by Average Floorspace--

 Single-Family Housing Units and Mobile Homes, 2005

Single-Family Detached Single-Family Attached Mobile Homes

Housing Unit Characteristics Total Heated Heated Cooled 1 Heated Cooled

 Housing 

Units 

(millions)

Average Square Feet per Housing Unit--

Single-Family and Mobile Homes SingleFamily

and

Mobile

Homes

(millions) Cooled

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Total1 Total1

Table HC1.1.3 Housing Unit Characteristics by Average Floorspace--

 Single-Family Housing Units and Mobile Homes, 2005

Single-Family Detached Single-Family Attached Mobile Homes

Housing Unit Characteristics Total Heated Heated Cooled 1 Heated Cooled

 Housing 

Units 

(millions)

Average Square Feet per Housing Unit--

Single-Family and Mobile Homes SingleFamily

and

Mobile

Homes

(millions) Cooled

Number of Stories

Single-Family Homes

1 Story........................................ 46.7 46.7 2,226 1,552 1,085 1,382 987 525 N N N

2 Stories..................................... 28.0 28.0 3,452 2,552 1,638 2,029 1,554 800 N N N

3 or More Stories........................ 2.5 2.5 4,429 3,399 1,599 3,049 2,459 1,623 N N N

Split-level.................................... 1.9 1.9 3,433 3,039 2,186 Q Q Q N N N

Other.......................................... 0.5 0.5 2,618 2,134 1,200 Q Q Q N N N

Not Asked................................... 31.4 6.9 NNNNNN 1,059 944 554

Major Outside Wall Construction

Siding (Aluminum, Vinyl, Steel).. 35.3 31.9 2,703 2,001 1,294 2,048 1,527 1,021 1,030 925 553

Brick........................................... 31.3 20.2 3,073 2,205 1,741 1,844 1,436 740 N N N

Wood.......................................... 20.0 16.6 2,638 1,888 931 2,359 1,755 1,041 1,239 1,051 516

Stucco........................................ 14.8 10.5 2,263 1,669 1,079 1,312 1,019 507 N N N

Concrete/Concrete Block............ 5.3 3.4 2,393 1,660 1,614 QQQQQQ

Composition (Shingle)................ 1.9 1.8 2,564 1,674 776 QQQQQQ

Stone.......................................... 1.0 0.8 4,460 2,857 2,380 Q Q Q N N N

Other.......................................... 1.5 1.4 2,749 2,111 1,185 QQQQQQ

Foundation/Basement of SingleFamily Units and Apartments in

2 to 4 Unit Buildings

(more than one may apply)

Basement................................... 35.5 34.0 3,356 2,428 1,466 2,356 1,731 820 N N N

Crawlspace................................. 25.1 24.3 2,451 1,765 1,037 1,839 1,303 766 N N N

Concrete Slab............................. 40.2 36.6 2,584 1,871 1,429 1,734 1,422 911 N N N

Not Asked (Mobile Homes and...

Apartments in Buildings

With 5 or More Units)................. 23.7 6.9 NNNNNN 1,059 944 554

Fuels Used for Any Use

(more than one may apply)

Electricity.................................... 111.1 86.6 2,720 1,970 1,310 1,941 1,475 821 1,059 944 554

Natural Gas................................ 69.5 54.3 2,748 2,015 1,391 1,946 1,486 807 1,039 918 418

Wood.......................................... 14.4 14.0 2,951 2,195 1,371 3,028 2,517 2,065 1,318 1,238 655

Fuel Oil....................................... 8.4 6.6 3,277 2,161 495 2,731 2,010 Q 880 541 Q

LPG............................................ 12.6 12.0 3,023 2,238 1,387 Q Q Q 1,063 870 482

Kerosene.................................... 1.7 1.6 2,431 1,673 754 Q Q Q 938 850 Q

Solar........................................... 0.2 0.2 2,261 1,704 Q NNNNNN

Main Space Heating Fuel

Natural Gas................................ 58.2 46.6 2,733 2,011 1,378 1,995 1,520 858 1,022 933 356

Electricity.................................... 33.7 23.7 2,584 1,861 1,545 1,655 1,347 849 1,081 992 762

Fuel Oil....................................... 7.7 6.0 3,298 2,179 495 2,731 2,010 Q 822 785 Q

LPG............................................ 6.0 5.9 2,668 2,048 1,289 Q Q Q 1,153 997 619

Wood.......................................... 2.9 2.8 2,584 1,993 765 QQQQQQ

Kerosene.................................... 0.7 0.7 1,908 1,124 Q Q Q Q 935 873 Q

Solar........................................... Q Q Q Q Q NNNNNN

Other.......................................... Q N NNNNNNNNN

None.......................................... 1.3 0.6 1,837 0 0 QQQQQQ

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Total1 Total1

Table HC1.1.3 Housing Unit Characteristics by Average Floorspace--

 Single-Family Housing Units and Mobile Homes, 2005

Single-Family Detached Single-Family Attached Mobile Homes

Housing Unit Characteristics Total Heated Heated Cooled 1 Heated Cooled

 Housing 

Units 

(millions)

Average Square Feet per Housing Unit--

Single-Family and Mobile Homes SingleFamily

and

Mobile

Homes

(millions) Cooled

Natural Gas Available

in Neighborhood

Yes............................................. 80.5 61.4 2,727 1,993 1,353 1,961 1,485 781 1,024 911 432

Actually Use Natural Gas........ 69.5 54.3 2,748 2,015 1,391 1,946 1,486 807 1,039 918 418

Do Not Use Natural Gas......... 11.1 7.1 2,566 1,820 1,051 2,069 1,480 599 947 877 504

No.............................................. 30.6 25.2 2,702 1,910 1,198 1,818 1,417 1,055 1,079 964 625

 1. Excludes floorspace in unheated garages.

 2. 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.

 -- = 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

Census Region and Division

Northeast............................................. 20.6 6.7 1,247 1,032 Q 811 788 147

New England.................................... 5.5 1.9 1,365 1,127 Q 814 748 107

Middle Atlantic.................................. 15.1 4.8 1,182 978 Q 810 800 159

Midwest................................................ 25.6 4.6 1,349 1,133 506 895 810 346

East North Central............................ 17.7 3.2 1,483 1,239 560 968 842 351

West North Central........................... 7.9 1.4 913 789 329 751 745 337

South................................................... 40.7 7.8 881 752 572 942 873 797

South Atlantic................................... 21.7 4.9 875 707 522 1,035 934 926

East South Central........................... 6.9 0.7 Q Q Q 852 826 432

West South Central.......................... 12.1 2.1 915 884 743 771 759 648

West.................................................... 24.2 5.4 869 681 330 809 595 290

Mountain.......................................... 7.6 1.0 820 788 Q 759 743 556

Pacific.............................................. 16.6 4.5 878 660 348 820 562 231

Urban/Rural Location (Self-Reported)

City...................................................... 47.1 16.3 1,082 876 271 861 751 428

Town.................................................... 19.0 4.1 975 828 343 897 833 472

Suburbs............................................... 22.7 3.5 1,367 1,214 736 889 834 461

Rural.................................................... 22.3 0.6 962 796 Q 867 867 477

Climate Zone1

Less than 2,000 CDD and--

Greater than 7,000 HDD................... 10.9 1.4 1,095 868 Q 1,093 1,034 Q

5,500 to 7,000 HDD.......................... 26.1 6.3 1,269 1,115 302 815 745 257

4,000 to 5,499 HDD.......................... 27.3 7.1 1,214 962 152 826 806 330

Less than 4,000 HDD....................... 24.0 5.1 849 680 477 897 724 489

2000 CDD or More and--

Less than 4,000 HDD....................... 22.8 4.6 810 670 648 913 772 777

Ownership of Housing Unit

Owned................................................. 78.1 4.1 1,604 1,320 458 1,116 940 829

Rented................................................. 33.0 20.4 930 772 305 833 754 379

Year of Construction

Before 1940......................................... 14.7 3.8 1,186 992 56 709 674 Q

1940 to 1949........................................ 7.4 1.4 1,638 1,311 Q 742 693 Q

1950 to 1959........................................ 12.5 1.7 1,189 867 210 847 798 124

1960 to 1969........................................ 12.5 2.9 985 767 222 868 788 425

1970 to 1979........................................ 18.9 5.2 807 630 353 887 775 457

1980 to 1989........................................ 18.6 4.9 981 894 750 883 813 588

1990 to 1999........................................ 17.3 3.0 1,034 895 700 913 793 591

2000 to 2005........................................ 9.2 1.6 1,232 1,088 922 1,005 824 699

Number of Floors in Apartment

Buildings with 5 or More Units

1 or 2 Floors......................................... 8.2 8.2 N N N 875 772 448

3 or 4 Floors......................................... 6.0 6.0 N N N 875 800 448

5 to 10 Floors....................................... 1.6 1.6 N N N 796 729 285

11 to 20 Floors..................................... 0.6 0.6 N N N 898 761 Q

More than 20 Floors............................. Q Q N N N 1,009 862 938

Not Asked............................................ 94.4 7.8 1,090 902 341 N N N

Table HC1.1.4 Housing Unit Characteristics by Average Floorspace--Apartments, 2005

Total Heated Cooled Total Heated Cooled

2 to 4 Unit Building

Housing Unit Characteristics

 Housing 5 or More Unit Building

Units 

(millions)

Average Square Feet per Apartment in a --

Apartments

(millions)

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC1.1.4 Housing Unit Characteristics by Average Floorspace--Apartments, 2005

Total Heated Cooled Total Heated Cooled

2 to 4 Unit Building

Housing Unit Characteristics

 Housing 5 or More Unit Building

Units 

(millions)

Average Square Feet per Apartment in a --

Apartments

(millions)

Major Outside Wall Construction

Siding (Aluminum, Vinyl, Steel)............ 35.3 3.5 1,286 1,090 325 852 786 461

Brick..................................................... 31.3 11.0 1,157 1,012 329 872 839 398

Wood................................................... 20.0 3.4 1,064 828 316 768 676 407

Stucco.................................................. 14.8 4.3 906 659 354 898 717 508

Concrete/Concrete Block..................... 5.3 1.9 766 598 535 943 653 540

Composition (Shingle).......................... 1.9 QQQQQQQ

Stone................................................... 1.0 QQQQQQQ

Other.................................................... 1.5 QQQQQQQ

Foundation/Basement of SingleFamily Units and Apartments in

2 to 4 Unit Buildings

(more than one may apply)

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

Crawlspace.......................................... 25.1 0.8 843 733 210 N N N

Concrete Slab...................................... 40.2 3.6 983 795 492 N N N

Not Asked (Mobile Homes and

Apartments in Buildings

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

Fuels Used for Any Use

(more than one may apply)

Electricity............................................. 111.1 24.5 1,090 902 341 872 780 441

Natural Gas.......................................... 69.5 15.2 1,184 968 277 876 809 347

Wood................................................... 14.4 0.4 QQQQQQ

Fuel Oil................................................ 8.4 1.8 1,116 980 Q 850 836 0

LPG..................................................... 12.6 0.6 Q Q Q 864 804 474

Kerosene............................................. 1.7 Q N N N Q Q Q

Solar.................................................... 0.2 Q N N N Q Q Q

Main Heating Fuel

Natural Gas.......................................... 58.2 11.6 1,222 1,013 293 889 823 384

Electricity............................................. 33.7 10.0 858 739 581 857 771 552

Fuel Oil................................................ 7.7 1.7 1,133 991 Q 842 827 0

LPG..................................................... 6.0 QQQQQQQ

Wood................................................... 2.9 QQQQQQQ

Kerosene............................................. 0.7 Q N N N Q Q Q

Solar.................................................... Q NNNNNNN

Other.................................................... Q QQQQQQQ

None.................................................... 1.3 0.6 Q Q Q 1,007 Q Q

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC1.1.4 Housing Unit Characteristics by Average Floorspace--Apartments, 2005

Total Heated Cooled Total Heated Cooled

2 to 4 Unit Building

Housing Unit Characteristics

 Housing 5 or More Unit Building

Units 

(millions)

Average Square Feet per Apartment in a --

Apartments

(millions)

Natural Gas Available

in Neighborhood

Yes...................................................... 80.5 19.1 1,146 944 288 877 794 404

Actually Use Natural Gas................. 69.5 15.2 1,184 968 277 876 809 347

Do Not Use Natural Gas................... 11.1 3.9 846 751 372 881 749 572

No........................................................ 30.6 5.4 839 717 577 853 735 560

 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.

 -- = 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