You're right. I hate spraying so much that I am in denial about it.
My outside air temperature is 24 degrees right now, at midnight. I just went to the greenhouse and it was 33 inside. That's not too shabby for having just a single layer of plastic. My thousand gallons of water, half of which is in black open bins, helps a lot, especially after a sunny day like today. I don't seem to be experiencing any colder temperatures than outside.
I turned on my heater, and rigged up a 2' x 4' open window for it to draw fresh air. I think it should at least not shut off this time. There is no wind at all, so that help keep heat in despite the open, ground-level window.
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