[FLPERMACULTURE] heating systems

[Charlotte Williams]

I'm wondering if anyone has any experience, advice, or thoughts on using a
ground source heating system in this climate (ithaca)?  We currently have a
natural gas baseboard hydronic system. We really like the heat it puts out,
but the furnace will have to be replaced at some point. So we are pondering
what would be the most economically and ecologically thoughtful replacement
- a high efficiency natural gas furnace? Ground source heat pump? Something
else?

We'd appreciate hearing your thoughts. Thanks.
Charlotte
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