Table HC3.4 Space Heating Characteristics by Owner-Occupied Housing Unit, 2005

 Million U.S. Housing Units

Total................................................................ 111.1 78.1 64.1 4.2 1.8 2.3 5.7

Do Not Have Space Heating Equipment....... 1.2 0.6 0.3 N Q Q Q

Have Main Space Heating Equipment.......... 109.8 77.5 63.7 4.2 1.8 2.2 5.6

Use Main Space Heating Equipment............ 109.1 77.2 63.6 4.2 1.8 2.1 5.6

Have Equipment But Do Not Use It.............. 0.8 0.3 Q N Q Q Q

Main Heating Fuel and Equipment

Natural Gas.................................................. 58.2 41.8 35.3 2.8 1.2 1.0 1.6

Central Warm-Air Furnace........................ 44.7 34.8 29.7 2.3 0.7 0.6 1.4

For One Housing Unit........................... 42.9 34.3 29.5 2.3 0.6 0.6 1.4

For Two Housing Units.......................... 1.8 0.4 Q N Q Q N

Steam or Hot Water System..................... 8.2 4.2 3.1 0.4 0.5 Q N

For One Housing Unit........................... 5.1 3.8 3.1 0.4 0.3 Q N

For Two Housing Units.......................... 3.1 0.5 N Q Q Q N

Floor, Wall or Pipeless Furnace................ 2.3 1.0 0.8 Q N Q Q

Room Heater............................................ 2.0 1.1 1.0 Q Q N Q

Other Equipment...................................... 0.9 0.6 0.5 N Q N Q

Electricity...................................................... 33.7 21.3 16.5 0.9 0.3 1.1 2.4

Built-in Electric Units................................. 5.0 1.9 1.6 Q N Q Q

Central Warm-Air Furnace........................ 16.0 9.4 6.7 0.4 Q 0.6 1.5

For One Housing Unit........................... 15.2 9.3 6.5 0.4 Q 0.6 1.5

For Two Housing Units.......................... 0.9 Q Q NNNN

Portable Electric Heater........................ 9.2 8.2 7.1 Q Q Q 0.5

Heat Pump............................................... 1.6 1.1 0.7 Q N Q 0.3

Other Equipment...................................... 1.9 0.7 0.5 Q N Q Q

Fuel Oil......................................................... 7.7 5.8 5.0 0.3 0.3 Q Q

Steam or Hot Water System..................... 4.7 3.1 2.6 Q Q Q N

For One Housing Unit........................... 3.3 2.9 2.6 Q Q N N

For Two Housing Units.......................... 1.4 0.2 QQQQN

Central Warm-Air Furnace........................ 2.8 2.4 2.2 Q Q N Q

Other Equipment...................................... 0.3 0.2 Q Q N N N

Wood........................................................... 2.9 2.6 2.3 Q N N Q

Heating Stove........................................... 2.0 1.7 1.5 Q N N Q

Other Equipment...................................... 0.9 0.8 0.8 N N N Q

Propane/LPG............................................... 6.0 5.2 4.1 Q N Q 1.0

Central Warm-Air Furnace........................ 4.1 3.6 2.8 Q N Q 0.7

Room Heater............................................ 0.9 0.8 0.6 N N N Q

Other Equipment...................................... 1.0 0.9 0.6 Q N N Q

Kerosene...................................................... 0.7 0.5 Q Q N N Q

Other Fuel.................................................... 0.6 0.3 0.3 N N N Q

Housing Units Served by

Main Heating Equipment

One Housing Unit......................................... 101.0 76.0 63.2 4.1 1.3 1.8 5.6

Two or More Housing Units.......................... 8.8 1.4 0.5 Q 0.5 0.4 N

Do Not Have Heating Equipment.................. 1.2 0.6 0.3 N Q Q Q

Age of Main Heating Equipment

Used by One Housing Unit

Space Heating Characteristics Detached Attached 2 to 4 

Units

 OwnerOccupied 

Housing 

Units 

(millions)

Type of Owner-Occupied Housing Unit

Housing 

Units 

(millions)

Single-Family Units Apartments in 

Buildings With--

5 or More 

Units

Mobile 

Homes

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC3.4 Space Heating Characteristics by Owner-Occupied Housing Unit, 2005

 Million U.S. Housing Units

Total................................................................ 111.1 78.1 64.1 4.2 1.8 2.3 5.7

Space Heating Characteristics Detached Attached 2 to 4 

Units

 OwnerOccupied 

Housing 

Units 

(millions)

Type of Owner-Occupied Housing Unit

Housing 

Units 

(millions)

Single-Family Units Apartments in 

Buildings With--

5 or More 

Units

Mobile 

Homes

Less than 2 Years..................................... 11.7 9.1 7.8 0.5 Q Q 0.7

2 to 4 Years.............................................. 13.8 11.1 9.1 0.5 Q Q 1.0

5 to 9 Years.............................................. 20.6 17.5 14.9 0.7 0.3 Q 1.4

10 to 19 Years.......................................... 24.8 20.1 16.5 1.2 0.3 0.7 1.4

20 Years or More...................................... 21.5 15.4 13.0 1.0 0.3 0.5 0.7

Don't Know............................................... 8.6 2.9 2.0 Q Q Q 0.4

Used by Two or More Housing Units

Less than 2 Years..................................... 0.3 Q Q N Q N N

2 to 4 Years.............................................. 0.4 Q Q N Q N N

5 to 9 Years.............................................. 0.6 QQQQNN

10 to 19 Years.......................................... 1.1 0.5 QQQQN

20 Years or More...................................... 2.7 0.5 QQQQN

Don't Know............................................... 3.7 Q N N Q Q N

Proportion of Heat Provided by

Main Heating Equipment

All or Almost All............................................ 98.9 68.7 55.8 3.9 1.7 2.1 5.1

About Three-Fourths.................................... 5.8 5.0 4.6 Q Q N 0.3

Closer to One-Half........................................ 4.3 3.5 3.2 Q N N Q

Do Not Use Main Heating Equipment........... 2.0 0.9 0.5 N Q Q Q

Secondary Heating Fuel and Equipment

No................................................................ 76.2 48.4 37.4 3.2 1.5 2.2 4.2

Yes (More than one may apply).................... 34.9 29.7 26.7 0.9 0.4 Q 1.6

Natural Gas.............................................. 5.0 4.6 4.1 0.3 Q Q Q

Fireplace............................................... 2.7 2.5 2.2 Q Q Q N

Room Heater......................................... 0.5 0.5 0.5 Q N N N

Central Warm-Air Furnace.................... 1.1 1.0 1.0 N N N Q

Other Equipment................................... 0.8 0.6 0.5 Q N N Q

Electricity.................................................. 19.7 15.7 14.0 0.5 0.2 Q 0.9

Portable Heater..................................... 16.0 12.5 11.0 0.4 0.2 Q 0.8

Built-in Electric Units............................. 2.2 1.8 1.7 Q N N Q

Heat Pump............................................ 0.6 0.6 0.6 NNNN

Other Equipment................................... 1.3 1.2 1.0 N N N Q

Fuel Oil..................................................... 0.4 0.4 0.4 NNNN

Wood........................................................ 8.9 8.2 7.6 Q Q Q 0.3

Fireplace............................................... 6.7 6.2 5.7 QQQQ

Heating Stove....................................... 2.2 2.1 2.0 Q N N Q

Other Equipment................................... Q Q Q NNNN

Propane/LPG............................................ 2.3 2.2 2.1 N N N Q

Kerosene.................................................. 0.9 0.9 0.7 Q N N Q

Other Fuel................................................. 0.2 0.2 Q Q N N N

 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