chronically_crazy, 1 year ago 3.2-3.5 is also on a good day. It might not be as efficient when the outside temperature differences are further away from your thermostat setting inside, though if you have a geothermal setup, then you’ve got peak efficiency year round.
3.2-3.5 is also on a good day. It might not be as efficient when the outside temperature differences are further away from your thermostat setting inside, though if you have a geothermal setup, then you’ve got peak efficiency year round.