Extreems in either direction will challenge even the best RV, but it seems pretty much agreed that Newmar has the best insulation and of any production RV and come standard with dual pane windows. Also look for a heated wet bay, and something with at least two AC units. I had a 30’ Bay Star with one AC and it was somlly not up to the task in the South in the summer and early fall. My 35’ Ventana has two AC units and only a couple feet more interior space than the Bay Star and the difference is significant.
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