When in freezing overnight or daytime temps, we follow Rich & Peggy's plan and turn on our four Lasko 200 watt personal heaters.
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When we saw these heaters at Walmart several years ago, we instantly bought four to replace our four 100-watt bulbs that we have been using for many years to keep our four water bay areas from freezing. Bulbs were inside a plastic cage to try to keep things from touching them and possibly starting a fire. Our heaters work great and are the perfect solution for our propane furnace coach.
The furnace did a poor job of keeping bays warm, as it only put a little hot air in a few places and only when the furnace was running. Between furnace cycles, the bay cooled down much faster than the inside of our coach. We monitor the bay temps with a wireless thermometer that has three wireless sensors.
We seldom use the furnace as we prefer to use two small two-speed (900 & 1500 watt) floor electric space heaters to keep the inside of our coach warm. Heaters are easy to store when not in use and have a tip-over shut off button on the bottom. Bay and inside heaters are plugged into electric outlets that are not powered by inverter to prevent battery depletion if inverter inadvertently turns on. Non-inverter outlets are located in different places in our coach and were originally wired for washer-dryer, refrigerator & vacuum cleaner, so we just ran extension cords that are plugged into these outlets, to be used for heaters.
Run a 12" fan sitting on dash to blow air against inside of windshield to prevent condensation. Some forward MCD shades are left up, and all windows are wiped down in the morning of and condensation.
We have several $9 Harbor Freight water alarms strategically placed to notify us of any water intrusion or leaks. Bottom inside step near hinge alarm goes off sometimes from condensation or heavy rain.
Water Overflow Alarm
When temps drop to single digits, we put a large piece of Reflectix to seal in all plumbing, across the inside of the bay door opening. With heater and wireless thermometer on the other side of the Reflectix, we can know how the space is holding up in very cold temps.
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We removed bottom sink drawer to let room air flow into plumbing space.
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