Caravan

On our trips abroad with a touring caravan with no air con these are the things that helped.
Dark canvas shades for the actual windows, home made, pockets for top corners and a tie lower down. This meant we could have the windows open without letting in the sun. Roof lights shaded but open to let the heat out. Large wet sponge in dish in front of fan. We coped with temperatures in excess of 30deg for weeks like this.

Air conditioning unit. Otherwise sit outside in the shade until things cool down. Fans won’t do much to help.