I have spent the last 2 years living in my Outdoor RV Blackstone Merlot. Min temp was -37C, I had 3 consecutive weeks where the high was no warmer than -25C and low was cold as -34. This year was bad. I would use about 160# of propane every 3 weeks, the built in electric fireplace ran full time and I used a smaller electric heater during the day and when it was really cold during the night.
Problems: all the slids are cold, closets and any cupboard that are left closed is brrr cold. The bedroom slide closet has ice build up all the time, my clothes freeze to the wall. The living room slide isn't too bad, but I get ice build up around the kitchen nook. I build up on the windows and twice the water froze - have to get the interior temp up to 80F to get the water flowing - easy fix.
Can it be comfortable? Sure, but it does take work and you have to pay attention.
Super important, vent, vent and vent to keep the humidity down.
Lots of BS post in this thread, it would be great if posters could just post relevant 4 season trailer information.
