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