Hybrid or DUAL FUEL Heat – air source heat pump and natural gas

OOPS, didn’t set heat pump to lock out at 40 degrees.  10 degrees outside and turns out the heat pump is still heating the house – to 70!  So, house that used to have an 80,000 BTU furnace can easily be heated with roughly 32,000 btu at 10 degrees.  Guess that goes to show how much fluff heat loss calc’s have in them!

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