which one you want to build? ice cooler one? or evaporative? cuz I build evaporative one, out of bucket, 12v fan, water pump,
I did not try it yet in very hot climate ,so far I tried it in hot 90f+ room, about 15x20 room, I did not notice much difference but I only ran it for an hour or so, than I disconnected pump, filled bucket with ice cubes instead of water, it worked a lot better, until ice melted, I’m pretty sure it would work even better if air was blow thru the ice , so if you have access to ice, build one than works with ice, but make sure you have good drain, water melts ice, it will last longer if you drain water, however if can’t get ice, you need to build evaporative cooler, aka swamp cooler.
mine runs on laptop ps, or 12v or higher source, any battery, draw is less than 1 amp. I installed voltage regulator, and iirc set it to 10 or so volt, but it could be adjusted.
