Here's a great idea from my money-saving ezine:

For the last 7 years, I have lived in a home with no air conditioning. To keep cool, I close off windows to keep out the hot sun, use fans, drink cool water, etc. To make the fans more effective, I set a large bowl of ice or a jug of frozen water in front of them. The bowl/jug needs to be checked to be sure the air from the fan is circulating around them and is not blocked. You may need to experiment depending on the size of the fan. The best part is the air blowing out from the fans is cooled down even more because of passing around the ice, and with several around the home, my house is cooler.
Sandy in California