For those of you in summer school, this idea is surely a godsend.

I know when I took summer school, there was certainly no air conditioning in the dorms, and that was dreadful.

University of Waterloo ’05 graduate Geoff Milburn explains how and why he decided to build his own air conditioner for under $25:

To avoid dying in the summer of 2005, I built a primitive air conditioner. It’s a basic heat exchanger, using water as the medium.

You’ll need a fan, a large garbage can or cooler, and a trip to Home Depot. Read the directions. [via LifeHacker]

Let us know if any of you try this one out!