I have a major moisture problem!

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Shut the furnace off and go to electric heat for a day or two and the humidity will go away, guarantee. The lack of an a/c extracting humidity from the air, the gas furnace,adding humidity and poor ventilation is the perfect storm for your condition.
 
I would say no. the furnace combustion is all outside, and the heat to the indoor area is through a heat exchanger.
Which should dry out some of the moisture. You have a cold air return which the furnace draws from inside the rv, sends it through the heat exchanger or around the combustion chamber then it is sent out to the living spaces.
When it got chilly, I always hated using the rv furnace because the inside air would get so dry.
 
Welcome. Many range hoods have a door outside that can be latched shut so it doesn’t flop open to shut all the time while traveling. Check yours. It may have a door catch on each end of the door. If it is latched shut, then all the moisture created while cooking would not be going to the outside

In addition.. took me a long time to find the latch on my flapper (it was INSIDE on the side of the hood) Usually it's outside on the flap (Two turn things) where you can easily see them.
 
There's no heat exchanger in an rv furnace. The blower directs air through the combustion chamber and out the supply vent(s) . It's a simple closed system with a return air.
Please provide the Make/Model of this 'furnace' you speak of, I do not understand this 'furnace' you are describing. :-/
 
Humans release a lot of moisture into the atmosphere by just breathing. Add to that moisture from cooking, washing, and bathing, and you can get a LOT of moisture. The only real solution is ventilation. When we had a 27’ trailer, we had to keep the roof vent slightly open 24/7. It increased the heating bill, but it was effective. But as the OP noted, a dehumidifier also increases the bills.
 
If the humidity inside is higher than outside then you're making it. Gas furnaces raise humidity. You produce humidity, so do pets. You're either going to have to vent it out, or add another or larger dehumidifier. If your bath vent is passive you may need to look at a fan, if it has a fan leave it running longer. Try leaving the stove vent fun running periodically.
That is not true for a sealed RV furnace. if you'll look at yours, the outside intake air/exhaust air panel is obvious. It uses outside air for combustion,then exhausts that same air+combustion by-products outside.
Inside air is circulated around the sealed combustion chamber for heating the interior of the RV.
Reference:
 
using a hair blow dryer does what, dries out the wet hair
And the moisture goes into the surrounding environment. You dry your hair inside a closed RV, whatever water was in your hair is now contained in the air inside the RV. The environment is a closed box with some amount of water in it. Unless you vent the moist air outside or condense it and expel it as water, it's there forever no matter how many times it goes through a propane furnace or heat pump exchanger. For the OP, it's condensing on the walls and windows so the only cure is to increase the process of water removal (dehumidfier, venting), or decrease the process of creation (cooking, showers).

Mark B.
Albuquerque, NM
 
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Bubble wrapping the windows is a very stupid idea. Not only does it dramatically increase the moisture level it is also very dangerous to your health. You end up breathing too much CO2. It can kill you.
 
The nature of windows is they're air and water proof. Why would adding a layer of bubble wrap to them add moisture or increase CO2 concentration?

Mark B.
Albuquerque, NM
 
Maybe a million $ RV is sealed tight but ordinary RVs have plenty of air leaks. As long as a blower is running or there is any breeze outside there is considerable air exchange from outdoors.
 
There's no heat exchanger in an rv furnace. The blower directs air through the combustion chamber and out the supply vent(s) . It's a simple closed system with a return air.
from an article on how rv furnaces work:
"In forced air furnaces, outside air for combustion is force-fed through a sealed combustion chamber assembly and discharged to the exterior, while interior air of the RV is moved across a heat exchanger. This design ensures that no products of combustion are mixed with the interior air."
 

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