You can build it with a 5-gallon bucket, Styrofoam liner, PVC pipe, ice (or in this case, water frozen inside a milk jug), and a small fan. According to the video, it chilled air from 84 degrees F ...

Begin by placing the Styrofoam bucket liner into the bucket to create insulation. Now support the bucket against a wall and drill through the both the layers and create a hole that is big enough ...