We are camping and the water lines are all charged with shore water. All tanks have water in them. All the antifreeze has been purged. We can keep the interior of our Airstream about 25 degrees above the outdoor temp with the heat pump or a small electric heater. Our furnace has been removed.
How cold do you think it can get outside before we run into trouble?
Freezing for several hours....
I'd suggest you leave cabinet and closet doors open overnight or whenever near freezing.
I'd invest I'm a thermometer with a freeze alarm just so you know when you are near the threshold
FWIW we have been in 17° temps and not had am issue. We used a styrofoam cap over city water inlet and flush. Everything else is butyl foam protected.
Best luck and use common sense.
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