You don't state enough information about the current house.
Basement?
Upstairs? Open stud walls?
Do you have space for duct work?
Some use propane wall heaters or kerosene monitor heaters. There are floor propane heaters.
If money is not the object then all above who mentioned propane furnace are good.
Geothermal has issues in this climate and the payback is just not there.
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