I recently evicted a colony of bats from a house that ran a geothermal heating system. The house was built to run this type of energy system and had some very unique construction. From the exterior it looked like an ordinary gambrel-style house but on the inside it was anything but. The house has two exterior walls on all 4 sides with aq 1-foot space between the walls. It was basically a house built inside of a house (like the way a thermos has two interior layers to keep beverages hot). As I went into the attic I had to pass through a 24-inch void between the ceiling of the top floor and the floor of the attic. This void was filled with lots of crazy looking copper piping that went in every direction and dozens and dozens of glass jugs full of water? Yes water.
The homeowner informed me that the house doesn’t use any oil at all and that the heating costs for the year are minimal. He said that the jugs of water in the void under the attic produce coolness at night and give off heat during the day? (I might have that backwards) I was fascinated by this energy system so I did some research on it and found it to be much more complex than I had envisioned. Check out these links on Geothermal Heating:
I’ve read through quite a bit of that and still don’t understand how it works. Just another interesting scenario that i’ve encountered in the field. Oh and bats seem to like geothermal heat also as the attic was loaded with them!