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Old November 10, 2017   #68
bower
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Join Date: Feb 2012
Location: Newfoundland, Canada
Posts: 6,793
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I've tried to heat my greenhouse and it couldn't be done. Might as well try to heat up the outdoors. But if you have a good skin on it, why not.

I do think covering is the most important thing when you get those clear still nights when the cold air sinks and gets trapped inside the greenhouse.
In my place the wind is a big factor because it's a leaky structure. I can up the comfort level quite a bit by hanging row cover around the walls to block the drafts if it's windy, which is better for the plants when light levels are low and the cold is pushing in horizontally instead of vertically.
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