Here's your reference: http://www.eia.gov/todayinenergy/detail.cfm?id=10271 http://www.eia.gov/todayinenergy/detail.cfm?id=10271 In 2009, space heating was 40

Here's your reference: http://www.eia.gov/todayinenergy/detail.cfm?id=10271 http://www.eia.gov/todayinenergy/detail.cfm?id=10271 In 2009, space heating was 40% of US home energy use, air conditioning was 6%.