where are your gloves and your helmet?

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...