I think RV’ing must be something like motorcycling. You are willingly subjecting yourself to the elements. The loss of some comforts bring other freedoms and rewards. If you don’t like being cold, you’d probably be best moving that rig somewhere warmer during the cold months. No RV is going to be energy efficient compared to an insulated house. I can imagine that keeping an RV at 70º in a Colorado winter would be quite expensive.