We are one of the crazy folks that likes to take our rig and go skiing, so we took extra care to make sure we're prepared for winter temps. We also have been fulltiming for a few years, semi-stationary, for work.
We use the Camco heated hose and it's going on it's second winter season. We had a Pirit before that that worked for 3-4 seasons, but the "on" light was not lighting up anymore, so we decided not to risk it.
We don't get a lot of sub-freezing weather, but we can get some. We've had ours hooked up since late October and know it was "working" this week, temps got down to 16. We have a reflector/bulb in the space behind the basement wall, and know the extra heat duct goes into the belly which isn't far from the other tanks and kitchen lines. We have a trimmed down garden kneeling pad for in the UDC to block air coming around the hose, and leave the light on in the UDC. Furnace is set at 61 at night. We have a small electric Vornado heater in the bedroom that is variable speed and temperature controlled, so it mainly helps circulate the air, it doesn't come on too much. The furnace will run a lot overnight if the outside temp is below freezing.
During the day, when home, we run the fireplace, (and the ceiling fan in reverse mode), and have another small Vornado that is temperature controlled in the kitchen. (Midship). The Vornado heaters really help circulate the air and make the overall space feel warmer without running all the time.
In our previous rig, we had heat pads on our water lines farthest from the UDC, and a heating pad on the fresh tank and fresh water line to the pump. We did this because we had some freezing at the kitchen sink. (Essentially made our own Yeti package.)
We visit an RV park with lots of stationary full-timers near Dallas. Many of them have the metallic bubble insulation sheets in their windows, have their water supply hoses wrapped with insulation, have large propane tanks, and use rigid PVC pipe for their waste drain pipe. Some have skirting, most do not. But in Texas, we don't get too much wind that causes low wind-chill temps.
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