And when it is overloaded, as will happen, the electricity grid will fail. It happens continually with very cold weather. It will now begin to happen with very hot weather. So what will they do then?

As someone who sat through many architecture classes, it is more than possible to keep homes cool without aircon. The problem is the way that American homes are built. If you live in Spain or many other hot places, people don't have or use aircon. Homes are built to be cool.