An ice block in front of a fan?
Ice in front of a fan, or a board in the window with bottles through it. Here is a window idea for a vehicle, but they do this in 3rd world countries for non a/c areas. If you do this window idea, put a fan in front to blow IN the room and pull air through it from outside: https://www.hometalk.com/33565842/cooler-air-with-no-electricity
Hi Joan, the looks like an awesome idea!