#4-DIY: Make your own Air Conditioner
This DIY AC comes in 4th place. It works well and costs about $40 in parts to make. We ranked it in this position because it’s a little tricky to make if you’re not handy. While it can be moved from room to room you can’t put in in your car, or take it camping. It is pretty sturdy, and we’ve seen demos where some pretty cool air is thrown off by it as low as 58 degrees F.