I'm going camping next week for the 4th of July. As we all know, Kansas is hot as hell on the 4th, and I hate being hot when I sleep.
So, I looked up what I can do to cheaply cool my tent over the holiday weekend, and I found the above video. It's a simple way to create a portable air conditioner that will blow air at a temperature of around 59 degrees!
I was going to buy one of the pre-made coolers from the big brands, but they cost upwards of $100.
This one will cost you around $8 and work just as well.
I'm making mine this weekend. I'll let you know if it works as well as The Household Hacker says.