Very cool idea. I'm reminded of the setup at Chena Hot Springs Resort (east of Fairbanks, Alaska), where the temperature difference between a hot spring and a

Very cool idea. I'm reminded of the setup at Chena Hot Springs Resort (east of Fairbanks, Alaska), where the temperature difference between a hot spring and a normal stream, is used to run an air conditioner that keeps the interior of an "ice museum" frozen year-round. It's a very different process, of course, but it seems to me to involve similar thinking.