My suggestion: If you are considering spending $XXXX for geothermal / radiant / solar / whatever, do a heat loss calculation assuming you spent the same $XXXX for upgraded windows and insulation. Then think about the increased comfort of the superinsulated house, better ability to ride through power or furnace outages, ....
Our house recently went through a two day power outage where the outside temperature hit 90 degrees F. The house stayed a steady 75-77 degrees inside.
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