Does a Vented RV Furnace Add Moisture To The Air?

Don't have much to do with the above but for interest sake... increasing the air temperature 20degrees F doubles it's capability to hold moisture.

Ex: 100% moisture in 50 degree air heated to 70 degrees = 50% moisture. Works the other way too.. 70*F at 50% humidity cooled to 50*F = 100% humidity.

Learned this when working with ventilation systems in 500ft long chicken houses. Not knowing this can kill thousands of birds in a short time and rust cables supporting the feeding system. Couple growers I know learned the hard and expensive way thinking they would save money one winter.

I suppose that would explain all the moisture at the windows of a camper too.

The heat source is less important than the moisture being introduced to the relatively sealed environment. As noted many activities including breathing adds moisture to the air.

rhagfo wrote:

12thgenusa wrote:
Has nothing to do with the type of heat. It is the warm, moist air (caused by living, breathing people, and showering and cooking) coming in contact with any cold surface (windows, poorly insulated walls, roof vents). You don't see it when it is warmer outside because there are no surfaces below the dew point of the air unless you have a cold drink sitting on the table.

That covers it so to cut down on condensation don't, bathe, cook or breathe inside the RV! :)

Right. If it is that cold, just minimize the cooking, bathe another day or at least not a long hot steamy shower, vent some to draw in dry colder outside air. We have the same problem in our stick and brick house here in Northern MN. As I write this we have 2" of ice on the bottom edge of all the windows. It is 63 inside and -29 outside. No way to stop it.

12thgenusa wrote:
Has nothing to do with the type of heat. It is the warm, moist air (caused by living, breathing people, and showering and cooking) coming in contact with any cold surface (windows, poorly insulated walls, roof vents). You don't see it when it is warmer outside because there are no surfaces below the dew point of the air unless you have a cold drink sitting on the table.

That covers it so to cut down on condensation don't, bathe, cook or breathe inside the RV! :)

Goostoff wrote:
In thory it doesnt but I have to say in cold weather our windows will be soaked and the roof vents will actually get wet enough that they will drip on the floor.

Warm air can hold more moisture in it than cold air. As air cools the moisture drops out of it. In an RV the windows and some walls are the coolest spots. As the air cools in those areas, since it cannot hold as much, it drops it out as moisture on those surfaces. If you can keep air moving it doesn't drop the moisture out as quickly because the cold air is moved away from those really cold areas like windows and circulated. The smaller the cavity the more you notice it.

Guess that explains it

Has nothing to do with the type of heat. It is the warm, moist air (caused by living, breathing people, and showering and cooking) coming in contact with any cold surface (windows, poorly insulated walls, roof vents). You don't see it when it is warmer outside because there are no surfaces below the dew point of the air unless you have a cold drink sitting on the table.

In thory it doesnt but I have to say in cold weather our windows will be soaked and the roof vents will actually get wet enough that they will drip on the floor.

It's cold outside and you are warming up the inside of a tin can.
Condensation is a problem in a trailer in winter temps.

If spending a lot of time using trailer in cold temps a portable dehumidifier helps

NO..
combustion air come from the outside, sealed combustion/burner chamber, any moisture goes out with the exhaust

why did you think other wise ??