Eh, you get used to it. Working in late afternoon and early morning, leaving windows open at night to let the decent air in, etc... There are a lot of little tricks to making it more tolerable, most of which only work in a society that is scheduled around the heat. The idea of doing anything between about 12:00 and 4:00 is just foolish. Even that can be done though, with sufficient attention to detail. Long loose cotton clothes, wide-brimmed hats, water jugs...