Category

Average Vintage

2013 Source Energy kBtu (kWh)

Average Site Energy Index kBtu/sf (kWh/m2)

All Homes

1983

145,532 (42,640)

41.5 (131.4)

All-electric

1994

139,097 (40,755)

33.9 (101.7)

Dual-Fuel

1978

148,787 (43,594)

45.4 (143.4)