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08-07-2016, 09:48 PM
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#1
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Senior Member
Join Date: Jul 2014
Posts: 439
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Condensation inside
When running our AC over night in the humid summer we always seem to wake up with condensation on things inside the camper. We have both roof vents open. The only exhaust fan is in the bathroom and can't leave that door open as it blocks the kids bunks.
Anyone else have condensation and how do you eliminate or handle?
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08-07-2016, 11:00 PM
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#2
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Senior Member
Join Date: Aug 2013
Location: Georgia
Posts: 183
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We had so much when we were in florida i thought the sink was leaking
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08-07-2016, 11:08 PM
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#3
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Senior Member
Join Date: Aug 2015
Posts: 463
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We shut all roof vents to the outside when camping in humid weather.
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08-14-2016, 08:32 AM
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#4
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Tom
Join Date: Mar 2016
Posts: 386
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I left the roof vent open by accident and had a condensation issue. Closed it and the issue went away.
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08-14-2016, 08:47 AM
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#5
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Senior Member
Join Date: Jul 2014
Posts: 439
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Interesting. I always thought you should have vents open to decrease the condensation. But seems like that's not the case....
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TT- '21 Spirit XTR 2146BHX
TV- '19 Nissan Titan XD Cummins Diesel 5.0
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08-14-2016, 09:18 AM
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#6
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Senior Member
Join Date: May 2014
Location: IL
Posts: 1,295
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Hi,
The open vents allow humid outside air to enter the unit, and the cooler interior, somewhat less humid, environment promotes condensation.
FWIW.
Ric Phillips
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Rich Phillips
2019 K-2500 Duramax Crew Cab
2014 Silverback 33RL
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08-15-2016, 12:29 PM
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#7
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 9,850
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The A/C is basically a dehumidifier, so keeping the RV closed as much as possible will allow the A/C to lower the humidity in the unit. Leaving the vents open results in moist outside air migrating into the less humid RV, as eluded to above in a couple of posts.
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08-15-2016, 12:38 PM
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#8
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Senior Member
Join Date: Jun 2015
Posts: 627
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If you have condensation inside, then you have a massive air leak that's allowing warm humid air to get in and the moisture is condensing on the cool surfaces.
It appears your massive air leak is your open vents.
Close the vents and I bet your condensation problem goes away.
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08-15-2016, 12:49 PM
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#9
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Senior Member
Join Date: Dec 2011
Posts: 3,570
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Winter time is the opposite, warm moist air trapped inside will condense on any surface in contact with cold outside surfaces. This is when you need to vent.
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08-15-2016, 12:52 PM
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#10
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Site Team
Join Date: Oct 2014
Posts: 15,266
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Cold outside vents open to prevent condensation
Hot out vents closed to prevent condensation.
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10-18-2016, 10:07 AM
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#11
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Junior Member
Join Date: Oct 2013
Posts: 1
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Bought a dehumidifier at Walmart which we run during day when we are out and about, or at night (doubles as a nice noise maker) and have had no issues. Amazing the volume of water it accumulates in a day's time. Good luck!
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10-18-2016, 10:18 AM
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#12
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Senior Member
Join Date: May 2016
Posts: 1,363
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Condensation inside
Condensation is the result of cooling down air that contains moisture (humid air).
Running the air conditioner removes moisture from the air. That is the dripping condensate you see from your roof.
The longer the air conditioner runs, the more moisture is removed from the inside air and dumped on the ground. However, if you are leaving vents open, you are continually letting in more humid air from the outside. This warm humid air touched the colder surfaces and instantly leaves condensation.
You must seal up your camper by closing your vents.
Remember: the act of cooling down warmer humid air creates condensation. When warmer humid air touches anything colder, it will condense.
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10-18-2016, 10:37 AM
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#13
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Senior Member
Join Date: Mar 2015
Location: N. Illinois
Posts: 2,371
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I have 3 small air circulating fans and an electronic dehumidifier that I run at varying times. It helps
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10-18-2016, 10:45 AM
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#14
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Senior Member
Join Date: May 2016
Posts: 1,363
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Condensation inside
Something else to keep in mind, an undersized (or properly sized) air conditioner will remove humidity better than an oversized air conditioner. This is due to the smaller a/c running longer/more-often.
"To much" a/c is rarely an issue in campers, however I thought I would bring it up.
Letting your a/c continually run, rather than turning it off except when you need it, will help de-humidify.
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10-19-2016, 06:56 AM
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#15
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Senior Member
Join Date: Mar 2012
Location: Brookings
Posts: 561
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A good dehumidifier works great!
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10-19-2016, 07:53 AM
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#16
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Senior Member
Join Date: Jan 2016
Location: x
Posts: 12,423
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When I worked in the HVAC industry we used to remind folks that "it an air conditioner not a cold air machine" To big an AC cools to fast without removing moisture you get condensation (in a stick house wet sheetrock and mold) to small AC can't keep up with heat generated. Like others have said close vents in summer crack vents in winter just the opposite of what one would think.
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11-10-2016, 10:53 PM
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#17
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exposurecontrol
Join Date: Aug 2016
Location: Ashland, MO
Posts: 26
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Well, that was helpful advice. I've never had condensation problems in warm weather but have had problems with water condensing on the inside of windows in cold weather. I have a Hemisphere Lite and the only ceiling vent is in the bathroom. Wonder if that would be enough. Otherwise, I'd have to crack a window open I guess.
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