Homemade Air Conditioner

Summer is coming and I’ve been thinking about whether I’m going to be able to keep my place cooled off… I live in a loft, and I’ve seen temperature differentials of over ten degrees between the lower floor (where the entrance is and the wine is kept) and the upper floor (where, unfortunately, I try to sleep!) In the summer this can go to 75/90 if I’m not cautious. Fortunately I’ve discovered some simple ways to keep it to 70/85.
But seriously… 85? That’s crazy! I bought a rolling home AC unit but it has to have a blower out the window, which totally sucks at night. Phooey! I’m thinking that this awesome homebrew project might be fun to build…