Here's another trick I've used successfully when it starts to go below freezing. Purchase a digital thermometer with a remote sensor. These can be had for $20 or less. Put the remote sensor in your wet bay and set the console to alarm when it goes below freezing. It might wake you in the middle of the night but it beats frozen pipes. Also provides great peace of mind when you can just view the temperature in there anytime and know what kind of a buffer you have. It's amazing what even a 40 watt bulb will do in an enclosed space.
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2017 ACE 29.3
2012 Honda CR-V Dingy
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