Questions for those who have lived in an RV 4 seasons.

We have a well insulated motorhome with dual pane windows and would not attempt what you are talking about. We spent the past 2 winters in central Alabama where the lowest temp was 26 but most times above freezing and mid fifties during the day. We went thru a lot of propane and electricity (little electric heater) in Jan and Feb. We are heading further south this winter. I'd go for the insulated, heated cottage.