Well, it fell below freezing last night. Our overnight low was 30° F. My greenhouse did quite well considering, I haven’t caulked all the air leaks, yet. The low temperature in the greenhouse was 40°. The greenhouse has mostly single paned glazing. On the plus side I put about 140 gallons of water in there, which is almost one gallon per square foot of floor space. Considering I am in the Northwest, I think the greenhouse will perform just fine. I will be fixing the leaks and perhaps increasing the thermal storage, just to see how well it can do.
The main issue in our neck of the woods is getting enough light in the Winter months, so I will not decrease the glazing to increase the heat retention. Light seems to be good so far. We have plenty of Mustards and Swiss Chard growing like crazy.
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