We lost our entire 3100sf home to a fire recently and plan on rebuilding adding some square footage to bring it to about 3400sf. We had a Klondike/Eagle IV and are considering putting a Polar/Eagle II in the new house. The Eagle IV worked ok, but seemed to have a problem heating some of the rooms furthest from the furnace 2 floors away. Obviously, the furnace was in the basement at the extreme end of the house where the chimney was. Had a 3/4 hp motor on the blower. We also had a heatpump w/propane burner for backup heat and summertime AC. We're considering possible solar power for electricity and maybe geothermal for backup heat and summertime AC. Any advice or opinions would be greatly appreciated.