Within the residential
Table 1
sector, most of the energy
U.S. Residential Primary Energy
consumed is for space heating
Consumption by Building Type, 200
1
% Total
% Total
% Total
% Total 
(30 percent) and air condition 
Units
Owned
Rented
Btu 
(2001)
(2001)
(2001)
(1997)
ing (11 percent); both of these
Single family detached
59.0
52.1
6.9
73.4
uses are geared to maintaining
Single family attached
9.9
7.0
2.9
9.2
occupant comfort in response
Building of 2 4 units
8.9
2.0
6.9
5.0
to climatic conditions. An addi 
Building of 5 or more units
15.9
1.7
14.2
7.5
tional 12 percent is used for
Mobile home
6.3
5.3
1.0
4.9
water heating, and a further 
12 percent is for lighting. 
Total
100
68.0
32.0
100
The remainder of the energy
Sources: Energy Information Administration. 2004. 2001 Residential Energy Consumption
Survey: Housing Characteristics Tables, EIA, Washington, DC. Table HC1 2a. Energy
Information Administration. 2000,  1997 Residential Energy Consumption Survey, EIA,
consumed in homes goes for
Washington, DC. table 2.1.2, 1.2.6.
appliances, electronics, and
other purposes.
In the commercial sector, a great deal of energy is used for lighting (21 percent) and office equip 
+
ment (8 percent). Air conditioning (9 percent) requires almost as much energy as space heating (12 percent),
Table 2
caused in part by the need to offset the
heat generated by lighting and other
U.S. Commercial Primary Energy Use
by Building Type, 1999
electric equipment. The remainder of
Percent of Total
Percent of Total Energy
energy use in commercial buildings is 
Building Type
Square Footage
Consumption
for water heating, refrigeration, and 
Office
22
21
other purposes.
Retail Sales and Services
15
14
Education
10
12
In the residential sector, 
+
59 percent of all housing units are
Health Care
8
10
single family detached homes (Table 1).
Warehouse and Storage
8
9
These units account for 73 percent of
Food Services
7
8
residential energy consumption. Single 
Lodging
7
8
family attached units represent the
Sources: Energy Information Administration, 2002. 1999 Commercial Buildings
Energy Consumption Survey: Consumption and Expenditures Tables, p. 124, table C1.
second largest building type in terms
10
EIA, Washington, DC. 
+
Towards a Climate Friendly  
Built Environment
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