Understand all the stuff you mentioned. Most all that is up to snuff as far as the house is concerned. Also understand the theory of the system as my bro in law has had one of the first systems put in here in NE WI for about 20 some years.
It's getting time for me to think about this upgrade since my Lennox hi ef furnace is also about 20 years old.
Plan is to build a GSHP system and retain the Lennox for the really cold weather.
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