Found an article at azcentral.com about a Phoenix-area couple who have vowed to go without air conditioning for an entire year!
They also have a blog page about the experience, or experiment, whatever you want to call it.
I know that after living in the Phoenix area for 24 years, I grew tired of air conditioning, and almost never use it since I've moved to Albuquerque. But it's hard to imagine making it through a Phoenix summer without it! This couple was motivated by environmental concerns; I applaud them for their courage!