Ancient Persian Air Conditioning Maybe not the most practical solution for modern day houses, but it is interesting and those towers and domes look really cool!
DIY Evap Air Cooler! - JUMBO SIZED! Final version! (MAX cooling!) - Large Area Evap! - ez DIY This is an interesting design and it's probably pretty cheap, but I doubt it's very effective.
dilbert: Those little portable units aren't much use when it gets really hot. Then again they might save on the electric bill during times when it gets just a little bit hot.
It's getting to be that time of year. I have plans of getting my cooler going soon and I helped a neighbor with hers yesterday. It's beginning to look a lot like summer!