If you don't have AC but do have a refrigerator, you can build a DIY AC using a box, bottles of frozen water and a fan. There's YouTube tutorials on how to do it.
I have friends who use it in their apartment which doesn't have AC and doesn't allow installation of one.
Do the thermodynamics of that work out beyond a localized shift? (kitchen is hot, other room cool?)
I've always thought that refrigerators should be boxed in with air circulation where filtered intake air for the back comes from the basement and the then heated air is piped up to the attic to be vented.
I have friends who use it in their apartment which doesn't have AC and doesn't allow installation of one.