Do You Have a Summer Air Conditioning Strategy?

So far in the northeast it has been a hot summer--and we've still got a couple of months to go before cooler weather sets in and we can uninstall our window air conditioners. Having grown up with central air (and never being allowed to mess with the thermostat) I never gave much thought to how to most effectively use air conditioning--both to stay comfortable and not waste money or electricity.

The basic strategy my roommate and I have employed is to use the window units only when we are...