It may seem counter intuitive to open a window when it is cold outside and the furnace is running, but ventilation is the answer to condensation. Also consider that if moisture is building up in the atmosphere in the coach, then other things are too. Ventilate!
If the moisture does get ahead of us, we have on occasion, ran the A/C and electric heat together to pull out the moisture quickly. That is essentially what a dehumidifier does anyway, --first cool, and then re-heat the air.
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