We got a swamp cooler last summer, it is awesome! Uses a lot less energy then AC, and cools so well. We got the slim profile MasterCool at Lowes, I have not regretted it one bit. Our house was an oven our first summer here.
I'm thinking we might need to get one for next year. When we looked at our house it was early April and still snowing, so i didn't even think to ask about one. We get here in June and started wondering where the ac is. In New Mexico we had a swamp cooler and in Kansas we had central air. The central air was so much nicer than the swamp cooler.