There are some useful energy ideas on this HGTVPro website. I finally learned more about a swamp cooler, btw. My cousin in Phoenix has one, and I never really got a handle on it, but here's a photo and a description. I never wanted radiant heat in my floor 'cause I worry about how to fix it; but I do want to have a wood stove for heating backup in my next house. And I certainly didn't expect to come across a kerosene space heater, but they're safer now. You still have to be careful!
Link: Slideshow : Energy Options, Pt. 2: Home Solutions : HGTVPro.com