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We don't leave ours unoccupied for extended periods during the winter so haven't had to deal with this problem as stated. However, when we head south after Christmas, if there's a chance of water lines freezing we set the furnace at 45 so it will run as needed while we are tooling down the road. So far we've had no frozen pipes during those tows despite temperatures well into hard freeze range. I used 45 because it was as low as that particular thermostat would go (aftermarket thermostat we had on our 2003 3295RK).
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