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Keep in mind that when its forecast to go to 32 overnight it doesn't do that at the stroke of midnight. It takes all night to get down that far and thus isn't likely to be at freezing long enough to cause any problems.
If you're using the unit I wouldn't worry; just leave the furnace on. If its in storage you could leave the furnace on set to low (make sure your batteries are charged up and visit in the morning to charge them backup--if you're not plugged in). Of course if it is plugged in you could also use some small electric heaters to keep it above freezing--set them all on low; don't need it 72f in there.
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