There kind of… isn’t. I’ve been battling heat with extreme prejudice my entire life. MAYBE the closest thing to a solution is to drink lots of ice water and then hopefully you’re not one of those people who can’t sleep if its hot (i am).

Try to “store” as much “cold” as possible. i.e. if you have a half working a/c unit, run it at 100% at night and once the temperatures get as low as they’re going to get, close all the windows, cover the windows, unplug fridge or whatever is producing heat you can afford to shut down and maybe if you’re lucky it will be around 1 or 2 pm before it heats up to utter bullshit temperatures.

If you have a way to get unlimited free ice (IMPORTANT: and NOT from the fridge in the living space you are trying to cool), you can use that to cool things down in the evening when everything is the hottest. If you have to buy the ice, just buy a ac unit because it will pay for itself in no time. And if you’re doing this because you can’t afford the electricity, maybe see about wiring up a solar panel and battery which, again, will pay for itself if you could’ve afforded to literally buy bags of ice every day. And if you’re doing this to protect the environment, get a ac unit that doesn’t contain ozone-layer destroying coolant (i.e. most of them). Buying ice for cooling is incredibly inefficient.

You can also take the ice-based cooling strategy further. Get a bucket. A fan. A big radiator (you need quantity(sq area) not quality, get a shitty heater core one and not a pc watercooling one). A pc watercooling pump. Some tubing, along with whatever barb fittings and pipe clamps you need. Make it so that the radiator is sitting in front of a fan while having water from the bucket being pumped through it. Add your ice to the bucket. This system will dump the “cold” from the ice into the room as quickly as possible, MUCH quicker than just setting the ice in front of a fan to melt by itself. If you actually have a truly unlimited source of ice this will provide nearly the same amount of cooling (while the ice is fresh at least) as an actual window ac unit. I do this irl sometimes and usually keep one mostly set up and ready to go just in case my a/c stops working.

It’s going to take time to find a cheap or free radiator if you’re living like this for financial reasons but bending some copper tubing around the fan also works decently. If you buy it at the hardware store its likely going to come coiled up in a box and already in the perfect shape for this.

At a certain point, obtaining the amount of ice you need to maintain this becomes a problem. If you REALLY don’t want to buy an ac unit at this point as maybe some kind of personal challenge or whatever, its time to science the shit out of it. Get a refrigerator. Put it outside, as leaving it inside will dump heat into the room defeating the purpose. Mod a bucket into the fridge and run 2 tubes out of it: an input and an output. Run this tubing into your living space somehow and into the radiator and the fan. You could alternatively put the fridge inside and find a way to attach a duct to the back of it to vent air outside which is may be more convenient depending on your living situation. Congratulations. You’ve built an a/c unit without technically actually building an a/c unit. Maybe in some countries this helps for tax purposes. I’ve never tried going this far with it before saying fuck it and getting an a/c unit so post pics if you do.