Consider this idea: A basement that is finished for a living space with rooms, kitchen, etc. Under the floor is circulating radiant heat from a wood bolier funace outside. The hot water also is heated by the wood furnace. A heat exchange in the furnace. Either solar or wind generator to get off the grid , or hook up to grid as it's already in a building next door (or use to recharge batteries on dull days if using solar). But here is the other idea to the indoor basement living space. Atop the basement, build a greenhouse. The question to consider is flooring of the greenhouse that is the roof of the basement? crazy???