Table HC4-7a. Air Conditioning by Four Most Populated States, 

 Million U.S. Households, 2001

Air Conditioning

Characteristics

RSE Column Factor:

Total

U.S.

Four Most Populated States

RSE

Row

Factors

New York California Texas Florida

0.4 1.1 1.7 1.2 1.2

Households With Electric

Air-Conditioning Equipment ...................... 82.9 4.9 6.0 7.4 6.2 2.4

 Air Conditioners Not Used ........................... 2.1 0.1 0.8 Q 0.1 23.2

Households Using Electric

Air-Conditioning1 ........................................ 80.8 4.7 5.2 7.4 6.1 2.6

Type of Electric Air-Conditioning Used

 Central Air-Conditioning2 ............................ 57.5 1.3 3.9 6.2 5.7 6.7

 Without a Heat Pump ................................ 46.2 1.2 3.2 5.5 3.8 8.1

 With a Heat Pump ..................................... 11.3 Q 0.8 0.6 1.9 14.7

 Room Air-Conditioning ................................ 23.3 3.4 1.2 1.2 0.3 13.6

 1 Unit ......................................................... 12.8 1.6 1.0 0.5 Q 11.9

 2 Units ....................................................... 7.5 1.2 0.1 0.4 0.1 17.9

 3 or More Units .......................................... 3.0 0.7 Q Q Q 17.9

Number of Rooms AirConditioned in Summer 2001

 One or Two .................................................. 12.3 2.1 1.0 0.7 0.3 13.9

 Three ........................................................... 9.2 0.8 1.0 1.0 0.3 19.2

 Four ............................................................ 12.0 0.6 0.8 1.0 0.8 12.0

 Five or More ................................................ 47.3 1.2 2.3 4.7 4.6 6.3

Percentage of Rooms

Air-Conditioned

 100% ........................................................... 58.8 1.9 3.5 6.2 5.4 4.7

 50% to 99% ................................................. 12.1 1.0 1.0 0.8 0.6 14.9

 25% to 49% ................................................. 6.4 1.2 0.4 0.2 Q 17.2

 1% to 24% ................................................... 3.5 0.7 0.3 Q Q 17.0

Large Tree(s) that

Shade the Home

 Yes .............................................................. 41.5 1.9 2.6 4.2 3.1 7.9

 No ................................................................ 39.3 2.8 2.6 3.2 2.9 8.2

Central Air-Conditioner Age

(excludes systems for more than one

housing unit)

 Less than 2 Years ....................................... 6.1 0.2 0.3 0.6 0.4 24.1

 2 to 4 Years ................................................. 10.1 0.2 0.6 0.9 1.0 16.9

 5 to 9 Years ................................................. 15.4 0.5 0.7 1.6 1.8 14.6

 10 to 19 Years ............................................. 15.0 Q 1.3 1.2 1.7 16.6

 20 Years or More ......................................... 5.7 0.2 0.6 0.6 0.4 24.2

 Don’t Know .................................................. 3.7 Q 0.4 0.8 0.3 24.1

Central Air-Conditioning Use

 Only a Few Times ....................................... 16.8 0.7 2.9 0.4 0.5 14.6

 Quite a Bit .................................................... 12.1 0.4 0.8 1.1 1.2 15.9

 All Summer .................................................. 28.4 0.2 0.3 4.7 3.9 9.1

See footnotes at end of table.

Energy Information Administration

2001 Residential Energy Consumption Survey: Housing Characteristics Tables
Table HC4-7a. Air Conditioning by Four Most Populated States, 

 Million U.S. Households, 2001 (Continued)

Air Conditioning

Characteristics

RSE Column Factor:

Total

U.S.

Four Most Populated States

RSE

Row

Factors

New York California Texas Florida

0.4 1.1 1.7 1.2 1.2

Pays for Electricity for Central

Air-Conditioning

 Yes .............................................................. 55.5 1.3 3.9 5.7 5.6 6.9

 No ................................................................ 2.0 Q Q 0.5 Q 30.9

Age of Most-Used Room Air Conditioner

 Less than 2 Years ....................................... 3.1 0.4 0.2 0.2 Q 23.0

 2 to 4 Years ................................................. 5.3 1.1 0.3 0.4 Q 14.1

 5 to 9 Years ................................................. 6.4 1.2 0.2 0.4 0.1 17.1

 10 or 19 Years ............................................. 4.3 0.5 0.1 0.1 Q 23.1

 20 or More Years ......................................... 2.0 0.2 0.2 Q Q 24.9

 Don’t Know .................................................. 2.2 0.1 0.2 Q Q 29.8

Room Air-Conditioning Use

 Only a Few Times ....................................... 13.6 2.4 0.9 0.3 Q 10.8

 Quite a Bit .................................................... 5.0 0.5 0.2 0.2 Q 26.3

 All Summer .................................................. 4.7 0.4 0.1 0.7 Q 25.0

Pays for Electricity for Room

Air-Conditioning

 Yes .............................................................. 21.9 3.2 1.2 1.1 Q 10.5

 No ................................................................ 1.5 0.2 Q 0.1 Q 38.4

1 The number of households, where the end use is electric air-conditioning, does not include households that did not use their equipment (2.1 million). It does include

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

was electricity. 2 The 2001 RECS reported 800,000 households having both central air-conditioning and room/wall air-conditioners, with 600,000 households using both central

air-conditioning and 200,000 households using only room/wall air-conditioners. These room/wall air-conditioners are not included in the count of 23.3 million households

using room/wall air-conditioners. Note: This applies to all occurrences of central air-conditioning.

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

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

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

Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 2001 Residential Energy Consumption Survey.

Energy Information Administration

2001 Residential Energy Consumption Survey: Housing Characteristics Tables