The frementation swamp cooler is the low-tech, low cost way to go. This past summer, it was hot as hell, and the closet I use to ferment my beer (one bedroom apartment) didn't really go below 80 degrees. By using Euge's method, I was able to take a 10 gallon tub, and fit a bucket in there nicely. I poured in some water, and a good deal of water bottles. I also put an old tshirt over the bucket so it would draw up the cool water. The water was around 58-60 with all the ice bottles, and it kept the beer fermenting at around 68F. It's a little bit of a pain moving it from my kitchen and cleaning it up when a batch is done but it worked. I want to add some fans and some reflectex/insulation. The other downside was that it did sweat a lot on the really hot days.