When we travel in very cold weather I do the following:
1) Dash heater on high/temp setting and on recirculate only
2) Aqua-Hot on and zone 1 set to 72 or so which keeps the register under the dash providing heat
3) Never have experienced high humidity in the coach so no window issues
4) Typical travel day will begin well after sun up and camped well before sundown
Didn't experience any air in-leakage so perhaps different year of build
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