Air Conditioning by Region

Fully 87 percent of homes in the United States are now equipped with air conditioning--either central air or window units. Here is the percentage of households with air conditioning by region in 1980 and 2009:

	2009	1980
Northeast	86	49
Midwest	91	58
South	98	74
West	65	36

Source: Residential Energy Consumption Survey, Air conditioning in nearly 100 million U.S. homes