Fwiw
I find rather silly people sugesting leaving the windows open to get the moisture out.
Heating great outdoors is not my cuppa tea.
Drawbacks of using propane I guess
Why not get a heater that blows DRY hot air in the first place.
I use Espar,dry heat and very eficient..although bit pricey
Now fortunately theres much cheaper Chinese diesel available that is exact copy of Espar,so should work just as well hopefully.
many RVers convert their rigs to use them
https://youtu.be/ogLmROa1o9Ehttps://youtu.be/3j5qW9kKBLM