I’ve searched around and mostly seen people create custom radiator builds attached to their water supply, but that’s beyond my skill level and I’m not sure if linking it directly to the water supply via piping would violate the lease or not. Are there any solutions a bit more DIY that I could take advantage of?
As a kid I used tubes, a box fan, a cooler, and bucket with a siphon to cool me down.
You could easily set that up with just the water from a sink and some hardware store parts.
Search for ‘diy fan cooling tub copper coils’ as a start.
As an example: Homemade AC - The “Copper Coil” Air Cooler! - (Simple "Box Fan …
Copper coils have the best thermal efficiency, but plastic tubing would also work.
Get an actual radiator instead of making coils and attach a box fan to it. It’s something I was always going to do but never got around to.
Also give consideration to saving at least some of the water to use as “gray water”. If you’re not familiar with that, it means water you can use for many things but not for eating or drinking.
Pretty sure this guy is an engeneer.
Or, get an AC unit at that point.