I live in Northern Louisiana so my situation is completely different, and yet the same a couple days a winter.. It is not uncommon for temps to fall below freezing 3 or 4 nights a winter and we can depend on a couple of "Hard" freezes at ~ 15 to 17 degrees. Day temps are usually above freezing even when faced with the hard night freezes, but with the changes we are seeing to climate/weather, I dont want to take any chances. And I keep the coach in the driveway beside the house where it is always plugged into 50A service.
I follow the "not winterizing" process for us owners in the lower regions of the country. I do not go through the antifreeze or the complete blowout process. The process that I use for most winter days is that I have only the basement heat on with the electric water element of the AH. However, I also have two electric heaters, one on the dining room table, and one on the bedroom "chest of drawers" counter. All cabinet doors which contain water pipes are open all the time. Those heaters are controlled by mechanical timers which switch the heaters on at 6 or 7:00 and off again at 8 or 9 am. That is for typical cold nights during winter. For the Hard Freeze nights, I then kick on the diesel AquaHot and warm up the floor heat system the day before the hard freeze nights are predicted so the floor heat warms up both the bus and the basement. That should be enough to handle anything we are likely to get. Because the bus is located in the driveway, I check it each evening before going to bed to make sure everything is working and heaters are "on" and humming. On severely cold nights, I find myself waking up in the middle of the night and taking a trip outside to ensure that all is working as designed. Temps are set for low to mid 50s and the two heaters manage to keep the coach at at least those temps easily on the 900W setting each. I use the 900W setting as you can draw too much current on the Inverter bypass circuit (you wouldn't think you could throw a breaker with the Inverters bypassed, but every winter one or two guys will show up here running 2 1800 watt electric heaters at the same time and blow the bypass circuit breakers and wonder why they are getting no heat/electricity)(you can have too much electric heat).
I also check the temps on either my phone or also with a TempStick (available from Amazon) which monitors coach temp as frequently as you want it to monitor it and report it to their app (~$130).
One more factor. Often our hard freezes are associated with ice storms that cause widespread power outages that can go on for days. Because of this, I bit the bullet and installed a whole house 48 KW Generac generator a couple years ago so now the house is never without power (its all electric) for more than 30 seconds which removes that danger. We have 2 big heat pumps that handle the whole house but in those hard freeze or ice storm conditions, the heat pumps are not working and we are using "emergency heat" in the house which is two really large banks of resistive heat coils to provide the heat and those consume a ton of amperage)(the meter simply spins around in circles when those suckers are running)
Whether you live in the south or the frozen north, coach care in very cold weather is something that you pay a lot of attention to, all the time, even if stored inside.
Gary and Dee, Zowie and Bowie (traveling cat sibs)
2019 Cornerstone 45B, X15-605hp, Imperial, Spartan K3,
2013 Honda CR-V toad, Demco Excali-Bar II,
Demco Baseplate, Demco Toad Light system, 73 de W5Fi