My experience says to not go below 20 degrees F.

Thank you to all who have replied so far. I'd appreciate hearing more opinions, especially from those who have tried it.

All I can do is state why I said what I said. We had a 2002 35' National RV Dolphin, which was probably insulated similarly to a Minnie Winnie. We ended up spending two nights around 15 degrees and it was on the edge. The furnace never quit running and did not keep up set to 70 and the water coming from our tank got real cold and we were worried about our pipes freezing. Luckily it got warmer during the day, the 40s if I remember right. I am very sure if it stayed below freezing day and night we would have not had water. Other times we had overnight temps in the 20s and there was no problem.

There are wheels underneath that will naturally head south towards warmer weather if you will let them. I agree with Bill, 20° is as low as I would go. We had a 29' Class C before we retired and it was definitely not a cold weather rig. We had heaters for the tanks but if it didn't go above freezing during the day I would have been very worried.

Barb