This “air conditioner” design uses a fan to force cold air out of a cooler stocked with ice. elliotdeg says it only cost him about $11 to make.
“This video isn’t great but it shows in a very simple and cheap way how to make a swamp cooler at home. Get a shammie or its famous equivalent: a shamwow. Get it wet and place it in the back of a regular 20” fan that you probably already own or can be bought for cheap at any store.
The wet shammie will cool down the flowing air about 15° F to 25° F but ONLY if you live in a dry environment, like Arizona or some parts of California. It doesn’t work well in high humidity places like Florida or Georgia.
This is perfect when you have 100+° F outside temperature and your room or apartment is rapidly heating up, even with all those fans in the windows running at a 100%.
Now, remember, this is not an air conditioner. Do not expect air conditioner temperatures. It only cools down the air so your place isn’t burning hot when it is time to go to bed. Keep the shammie constantly wet so it keeps cooling down the flowing air.
This is a very cheap, energy efficient trick to cool down your room or apartment when it’s really hot outside. If you need more cooling power for a bigger place, just do the same in several rooms and remember to keep the shammie moist. Hope it works for you just as well it worked for me.