Not denying climate change, but there is more here than just the ambient heat. I grew up in Phoenix, and we didn't have a/c in our house or any of our vehicles. Even smaller stores didn't have a/c. We did have adequate ventilation, a crapton of fans and evaporative coolers and the good sense to take it easy from about 2 pm until sunset. We also had less pavement, and ironically a bunch of green lawns. The lawns were untenable from a water-resource perspective, but if the wind blew from your yard through the house, it was degrees cooler. I still visit, and the a/c has become a single solution to replace many.