1. They didn’t. The hottest parts of the US were heavily settled in part due to AC availability. 2. Houses were designed better. Architecture used to be much

1. They didn’t. The hottest parts of the US were heavily settled in part due to AC availability. 2. Houses were designed better. Architecture used to be much more regional to account for environmental differences and take advantage of them. https://archive.curbed.com/2017/5/9/15583550/air-conditioning-architecture-skyscraper-wright-lever-house https://archive.curbed.com/2017/5/9/15583550/air-conditionin... https://www.theatlantic.com/business/archive/2017/09/tim-harford-50-inventions/540276/ https://www.theatlantic.com/business/archive/2017/09/tim-har...