Changing weather patterns is the likely reason. In the second half of the 2010s, the share of Bay Area households with air conditioning increased more than 10 percentage points, from 36% in 2015 to 47% in 2019. Over 95% of households in the Houston, Miami, Dallas, Washington D.C., Philadelphia, Phoenix, and Chicago metro areas have air conditioning. It’s no surprise that hotter and more humid places have high rates of air conditioning. This compares with 81% of households in the Los Angeles metro area. Among the 15 largest metro areas in the country, the San Francisco metro area was second to last in terms of the share of households with air conditioning, with Seattle lowest at 44%. Census Bureau’s American Housing Survey, which tracks whether households have heating and cooling, shows that just over 47% of the San Francisco metro area’s 1.7 million households had air conditioning in 2019, the last year of published data.
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