I am in northern VT. I have been researching out the same problem. Verge permaculture on YouTube has plans and is running tests on a geothermal design. I am considering using composting heat capture in combination with a rocket mass heater. The composting bin would be built into the side of greenhouse. The compartment it creates on the inside would be the base for a water tank/ fish tank. The rocket heater would be vented thru the thermal mass wall much like a kachelofen design. But I am open to any ideas and would appreciate any discussion of pros/cons before the build.
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