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I have had nighttime temps down to 25 with daytime temps in 40s with no problems. This happens in early spring after I dewinterize. When this happens I usually run then furnace a little the night before and open up interior cabinets where there are plumbing lines. This gives the trailer a little boost in temperature. I also. Make sure waste tanks are empty and valves left open to avoid damage. Also not a bad idea to open faucets and low point drains to remove majorityof water in system .
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