Airconditioners save 20,000 lives in USA each year

Over the last century there was a remarkable decline in deaths due to hot days and heatwaves. (Not that the media seem keen to say so). Mortality on a hot day declined by fully 75% in the decades after 1960 when air conditioners started to be rolled out.

In the words of the authors from this 2016 study, the people of the US have largely adapted in ways that protect them from extreme heat. The kind of hot days they are talking about happen on average 20 days a year in the US.

There has not been a similar reduction in deaths from cold snaps.

First, we document a remarkable decline in the mortality effect of temperature extremes: The impact of days with a mean temperature exceeding 80°F (26.6C) has declined by about 75 percent over the course of the twentieth century in the United States, with almost the entire decline occurring after 1960. The result is that there are about 20,000 fewer fatalities annually than if the pre-1960 impacts of mortality still prevailed.

We achieved a lot of things in the 20th century, but when Barreca went through the statistics, it wasn’t the introduction of electricity that […]