In Oregon we have geo power very, very close to the surface. Like GEYSER close... In Klamath Falls, there are intersections that are geothermally heated. I lived in a geo heated house for a couple of years - had to open the windows because it was too hot.
I inspected trucks at a shop that had geo heated floors in eastern oregon. It was probably 5 or 6 degrees outside, and the shop floor was too warm to lay on comfortably. Just right on a creeper though.
Don't have anything intelligent to add to the thread - just that geo heat in a volcanically active area is amazing!!! VERY hot!
angela