Quote Originally Posted by bacpacker View Post
You have valid concerns. Snow loads that far north could be an Issue and where you mentioned going has tremendous snows. To me the easiest and most consistant heat would be from using a fire stoked boiler. I have saw lots of them on my trips to Mich. It is a little building where the fire is built and the heat is carried into the house. A guy I work with down here just bought one from the Amish and really liked it this past winter. I would think they might do the trick in a green house, and may be able to split it and heat your house as well.
Something else to look at are Wallipinis. Basically a greenhouse that has some or most of the walls underground. Some I have looked at have logs to support the roof/loads. I'd have to look back and see what the roof materials used were. But might be something worth looking into. They are in use in different areas around the world. I also think I recall seeing a thread the MIT had started a while back. Here is a link on the interweb.

http://permaculturenews.org/2014/02/...fied-walipini/

http://www.bing.com/images/search?q=...pini&FORM=IGRE

I am interested in seeing folks comments on this one.
I concur with son's assessment .