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Showing the cold weather on the day I started to heat the floor of the greenhouse. The corner of the greenhouse showing on the right behind the spruce. During the day it was around -10 degrees celsius, and during the night the temp dropped below -15 degrees celsius and the floor of the greenhouse was still quite warm on the next day even I added the last pile of wood over 10 hours earlier!! The thick concrete and proper insulation seemed to work much better than I expected!