@JaneAir - I sympathize. Utility costs are high where I live too. And the summer gets so hot that going without air conditioning is just not an option.
My parents actually just bought some air diffusers for their house and they saw a definite difference in their energy bill. I think I'm going to invest in some too! Even if there is an upfront cost, I think the amount of money I'm going to save will make it more than worth it.