This video shows how to make one kind of evaporative cooler. Evaporative coolers can lower the air temperature significantly in drier climates using evaporating of water across a porous surface. They're fairly easy to make with stuff you find in a hardware store and may offer some relief for folks who are facing record heat in places without AC.
Aha! This is the design https://youtu.be/I6u6yCe8RzI
Specifically, the small fan design seems to be the better one, the box fan isn't as good at the indirect cooling people it doesn't suck all the air through the heat exchanger