jimh425 wrote:
I guess your LP has a lot more moisture in it, or furnace doesn't burn as efficient. We never have significant moisture.
A furnace does not add humidity to your camper as the exhaust is vented, and if it does then you have a bigger problem then the humidity.
You should get in the habit of changing the air especially when cooking. Open some windows and a vent when cooking (especially boiling water). Then shut the window till bed time and reopen, leave a vent open slightly all the time.
Also if you are showering or drying wet clothes you will create more moisture then you will be able to vent this time of the year.