Ok.. I know this sounds odd. But I have been thinking about this for a long time. I have been thinking about building a very large (1500 square feet) greenhouse that I could turn into a "living" home. I want it to ultimately be as self-sufficient as possible with large ponds with fish large concrete waterfalls, plants etc. I have been doing research, and I was curious how hard it would be to heat/cool one of these structures. Is there any way to insulate them but still keep them functional? Any thoughts or advice? Ever heard of this before?