time2roll wrote:
All things equal the relative humidity drops with increased temperature. This is why the cold window or a cold beer sweats. The air in proximity cools and becomes more humid to the point the moisture actually precipitates out of the air and onto the item.
Same effect no matter the heat source.
Unvented combustion of any hydrocarbon produces moisture. Wiki has the chemistry if someone needs to see it.
I have no interest in the chemistry. I've camped in the cold weather using electric heat and I've camped in the cold weather with propane heat. Electric is cheaper. Electric has a lot less condensation buildup. Electric is quieter. Electric is more even temperature.
By all means, do whatever you want to do with your camper and your money. I was replying to the OP who was looking for real world advice.