During cold overcast weather, 5-10f degrees moderation if greenhouse is standing alone. If sun is out temps rise fast, a 50f sunny day will be 80f in the greenhouse. On a hot day, can be crazy hot. With both ends open if there is any breeze at all temps stay good. When wind stops on a hot day I need to cover greenhouse with 40% shade cloth to keeps temp good. Because my greenhouse is built against the south side of the cabin I get big benefits on frosty nights, the cabin a very large heat sink.