Harry, were you on electric or diesel? Also, my AC/heatpumps work down to about 45 degrees outside. OP not a clue as to R value in the walls.
Ernie and Shirley with Molly and Sophie our Brittanys
2019 Dutch Star 4363 Freightliner
2016 Ford Explorer Platinum
FMCA #F456868 NKK #23023