Working in northern Alberta and Saskatchewan I spent the last 3 winters in my Outdoors RV 2015 Blackstone Merlot. Average cost per month for electric (Dec thru March) was 370.00 cdn. and I went through 100 lbs propane ever 10 days. The trailer has a full skirt, I wrapped the bedroom closet slide in bubble wrap and use insulated pilllows in the fantastic fan wells (when not using the fan).
It takes work to live in your RV through the winter. The upside is the comfort and convince that I have over staying in a hotel.
2 weeks ago I purhased a RedWood RV 3901 WB. thicker walls, more roof/floor insulation, so I am hoping this trailer will be manageable through the winter as well.