My greenhouse is right next to my house, and there are windows right next to both ends of the greenhouse. Only problem is these windows are full of plants. My room only gets to about 60F in the winter
I might be able to circulate the air in my room into my greenhouse, having one duct pumping warmer inside air into the GH, and the other duct bringing it back into my room. I have a solar powered exhaust fan with a thermostat, that could be useful for doing this. I think I would need some way to warm the air though.
I want to grow HL nepenthes in the greenhouse like lowii, khasiana, rajah, mikei, etc. The idea of me setting up a greenhouse is so I don't have to confine nepenthes to a tiny space. But I have thought of a coldframe within my gh.
I'm browsing that link you gave me Joe, but there's a lot of info.
Do you have a direct link to his compost heater?