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
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