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I know how the mrs. goes. Mine gets on me when she has an idea in her head lol :) but I love her anyway. Heat could work. It could have a lot of mineral build up as well. PB blaster seems to be my best friend on stuck items and threads. Had to soak a shot gun barrel that had a stuck choke and it ended up finally penetrating enough

You shouldn't have anything to worry about tonight as the water in the ground is going to be plenty warm. I deal with plumbing and digging holes everyday and the ground is still plenty warm. If it scares you enough you can wrap it up with a big towel or you can get that foam that goes around the pipe. But like it said it shouldn't freeze