I would hate to not have air conditioning in Houston this time of year.
Most cultures who are based off very hot areas have a culture of a siesta where after an earlyish lunch, everyone just sleeps for an hour.
Works when you live close to work, but gets very difficult very fast if you are farther out.
The Spaniards are famous for their siesta, and it used to be (until recently) that most businesses would close from 12:30-1:00 till 3:30-4 over here in small town india (and in some metros like Bengaluru)
I would imagine that every place would have some coping mechanism or the other, be it ac, a halt on work, design of living spaces with heat rejection in mind and so on.