This brilliant woman in Northern Colorado figured out how to use a greenhouse extension on her house to generate heat that substantially reduces her use of the furnace, especially in the fall and spring.
She has a system that uses fans installed to blow hot air from the greenhouse directly into her living space.
Not only does the temperature rise to a comfortable level during the daytime, but the air she breathes is clean, fresh and enriched with oxygen.
She'll give you some important pointers on how to do this yourself!