[gorush]

It's an ICF, earth-sheltered home, heated and cooled via 3.5 ton heat pump and 5 ton geofield closed loop in-floor system.

The 100 gal propane tank is for the stove and clothes dryer only.

[Sawdring]

Cool system. Do you have an electric strip in your furnace, another backup system or does the geo/heat pump work all winter long?