Condensation in MH

[Farmer Folly]

We are hoping someone can provide guidance. We have a 2019 Thor Compass RV with an air conditioner on the roof (maybe a heat pump because it also heats). When it rains or is very humid outside and the AC is on, moisture condenses on all the internal surfaces. Since AC units tend to remove moisture from the air, I wonder if the unit is not recycling air inside the coach, but instead is simply blowing cold air from outside into the interior. Has anyone else had a similar experience and what was the solution? We’d like to sleep without being soaked in the morning.

[PictureTheSouth]

This sounds like a matter of physics, rather than an AC / heat pump issue.

Warm humid air introduced into a cooler environment will always condense.

Make sure all your doors/windows are properly sealed to prevent that humidity getting in. Minimize opening doors when not necessary.

After that - Damp Rid or equivalent is your friend. Hanging bags for your closets, and strategically placed "buckets" where you place them without tripping or tipping them over.

[Campnjoe]

We run a small dehumidifier. This works well in the summer. In the winter it's a different story and I usually wake up and wipe down the windows with a towel. Some suggest cracking a vent.

[chunker21]

RVs have poor insulation and the windows are most likely single pane. As such the colder glass panel vs the interior condensation will develop. The heat and humidity machines in the RV (human and animal) far overpower the heat and humidity removers, air conditioners/heat pumps. Thus the formation of condensation. Solutions are next time get dual pane windows, fans in the interior to circulate air around to help reduce the condensation. If you try a dehumidifier make sure it's drained to a sink and the grey valve open.

Welcome to the world of RVs and construction that in no way resembles a house construction.

[Farmer Folly]

Originally Posted by chunker21

RVs have poor insulation and the windows are most likely single pane. As such the colder glass panel vs the interior condensation will develop. The heat and humidity machines in the RV (human and animal) far overpower the heat and humidity removers, air conditioners/heat pumps. Thus the formation of condensation. Solutions are next time get dual pane windows, fans in the interior to circulate air around to help reduce the condensation. If you try a dehumidifier make sure it's drained to a sink and the grey valve open.



Welcome to the world of RVs and construction that in no way resembles a house construction.

The condensation occurred during the day when there were no animals or people inside, but rain outside. I guess in my naive world I thought the AC unit in the RV would extract humidity from inside, kind of like the mini split unit that heats and cools our porch. Guess I was wrong. Thanks to all for the helpful info. [emoji4]

[Hugh.vines@att.net]

I run my air set at 70 degrees 24 / 7 and it makes all the difference in the world. Even when it’s parked at home air is still running. Didn’t do this for the first two years and it had smells and moisture on windows now none of that and I don’t have to worry about mildew. I also clean my windows with tv and computer screen cleaner

[Grumpy Grampa]

Dehumidifier

[DogLovers]

Originally Posted by Farmer Folly

We are hoping someone can provide guidance. We have a 2019 Thor Compass RV with an air conditioner on the roof (maybe a heat pump because it also heats). When it rains or is very humid outside and the AC is on, moisture condenses on all the internal surfaces. Since AC units tend to remove moisture from the air, I wonder if the unit is not recycling air inside the coach, but instead is simply blowing cold air from outside into the interior. Has anyone else had a similar experience and what was the solution? We’d like to sleep without being soaked in the morning.

Had this issue in a Thor Synergy Sprinter Chassis RV. The fix was really easy. On very hot humid conditions we slightly opened one of the powered ceiling vents just an inch, end of problem and the coach stayed cool.