Even a little heat is worthwhile if you contain it under a cover with the plants.
My forecast for tonight is clear, low of 37, and patchy frost. I left a door open in the greenhouse. Tonight's conditions are perfect for the magic temp drop effect. I'm hoping if I leave the door open, it will be harder for the temp to get much lower than the outside.
Talk about counter-intuitive - it's going to be cold tonight, so I had better leave the door open so it stays warmer inside. sheesh.
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