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In a relatively mild Winter, I can keep my greenhouse above freezing overnight with two 1500 watt space heaters. However, the last couple of nights we've had below zero temps in my corner of the PNW. I grow only lettuce and mesclun mix in my 15 X 20 greenhouse, and my experience is that those crops will take a freeze down to 20 degrees without too much damage. Still, I'd like to keep the temp inside the greenhouse above freezing if possible. Need some feedback here and ideas from other lettuce experts.
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