Anyone used Geocomfort for a geothermal system? Any reason I should use them or not use them? Advantages or disadvantages over Waterfurnace? I've heard lots of mentions of waterfurnace, and there are a couple waterfurnace installers in the area. The other installer uses Geocomfort for water based geothermal or Earthlinked (a direct exchange system). We're looking at a 4 ton water to air system with horizontal ground loops.