Ahh, I just read back that you are building a greenhouse, which accounts for all of the heat loss. Glass is unfortunately very lossy and I don't know of any greenhouses that are heated in the winter in my climate. Any sort of growing is done indoors where the walls are insulated and there are grow lights used as you can't grow much with the short sun hours and cloudy days that come from being a northern area. Not to mention getting the snow off the roof grade glass. ..or plastic, whatever you are building with. I imagine your mud requirements will be tremendous.
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