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Old 12-14-2005, 03:12 PM   #15
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2014 Interstate Ext. Coach
Austin (Hays County) , Texas
Join Date: Jun 2002
Posts: 6,269
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Originally Posted by M&M CAPECOD
A quick question, is it true you'll dry out the inside of the trailer some if you run your heat pump?? I like the constant noise of that rather than the on off of the furnace which wakes me up. I know we can set our thermostat on automatic and it'll switch to furnace if the temp drops low enough. I was just wondering which would be a better way to get some of the moisture out of the trailer, the heat pump or the furnace? Is it true that the furnace adds more moisture because propane releases moisture when it's burned?
Neither statement is true. The AC will remove moisture from the trailer interior, but the heat pump does not. The "cold" side of the heat pump is outside on the roof and that is where moisture collects; that is the reason the heat pump must defrost occasionally.

The furnace will not put moisture into the trailer. The combstion process that is the source of moisture is sealed and open only to the outside of the trailer.

In other words, the only thing that puts moisture into the trailer interior in the winter is the occupants and the only thing that removes it is opening a vent.

I noticed sometime back on the Flying J site that they have a tiny dehumidifier that is intended for the sleeper cabs in 18-wheelers.

John W. Irwin
2014.5 Touring Coach, "Sabre-Dog IV"
WBCCI #9632
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