We are supposed to have a few days of lows in the mid 20's here next week. This would be a great time to gain some knowledge on heating the greenhouse. I plan to buy a heater this weekend and some tarps to close up the ends. I'm going to get an electric heater with a fan. How big of a heater do you guys think I will need to keep it above freezing enough to have my tomato plants in there at mid 20's? I'm not going to put them in there this weekend but I want to see what would happen if I did. I don't want to risk some calamity like popping a circuit breaker in the middle of the night. This will be a test run.
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