So, a lot of this is duplicated, but it’s a list of what I do against the heat …
External shutters outside of the windows, both are closed the moment the sun hits to shut in the cold(er) air, and open over night. We also have tiled shades over all the windows so there’s no direct sunlight into the house during most of the day.
Ceiling fans running at low speed
Cold 2 minute showers in the middle of the day
Put on a cold wet t-shirt
Wear as little clothing as possible while out of the sun. In the sun, light coloured breathable loose material (linen trousers are a godsend against mosquitoes)
Don’t go outside or be active in the hottest part of the day
Don’t eat much, if at all, during the day
And my wife’s favourite - getting in a kid’s paddling pool (I don’t like it, but she does)
None of this is going to help if wet bulb conditions occur … then you have to have air con, or you die.