This air cooler I've been using for last 2 years. I really like it.
It's not an air conditioner, but it works pretty good.
It's an evaporative cooler that you can 3D print. It used "size 4" coffee filters.
Apart from that you'll also need a 120mm fan.

Download it here:
https://www.printables.com/model/2324...
or
https://www.instructables.com/3D-Prin...