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Old 12-14-2015, 08:41 PM   #11
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All that is true, but the heater in a RV draws its combustion air from outside and the exhaust routes all if not most of the humid air as a result of combustion outside. The warm air that is used to warm us inside comes from a heat exchanger.

I think the majority of condensation in our rv's is from the difference in outside vs inside temperature. The moisture from combustion is negligible using the type heater in modern rv's.

Moisture can however be a problem especially if the unit is closed up.
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Old 12-14-2015, 09:36 PM   #12
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We crack a window, near each sleeping area. It does not need to be much. We also crack open the roof vent in the bathroom about a 1/2". Works great!
+1 roof vents always cracked and a window next to the bed
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Old 12-14-2015, 11:06 PM   #13
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We started running a dehumidifier when we full timed, and it just carried over to the present rig. It works, probably better than any other method. Yes, we run the fan in the bath when showering, but I don't like leaving windows and vents open, so when it's time to shut down for the evening, the dehumidifier takes over. And let me tell you, towels are dry in the morning, my sinuses are dry, and the camper feels very dry. The dehumidifier just works. No sweating windows, no muggy feel etc etc.
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Old 12-15-2015, 03:10 PM   #14
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This guy says that propane heat produces water. If true, I just learned something about condensation in RVs.
True. Propane is clean burning, but produces residual water that must be disposed of, usually through a vent pipe. It took a half a century, but that C in college chem finally paid off!
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Old 12-15-2015, 04:16 PM   #15
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True. Propane is clean burning, but produces residual water that must be disposed of, usually through a vent pipe. It took a half a century, but that C in college chem finally paid off!
Yes with ventless propane but not with RV furnaces that are vented to the outside.
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