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Thread: Condendation on ceiling

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    Condendation on ceiling

    Hi Folks - We're currently on a trip from AZ to Niagara Falls and back. Into our 6th week of the trip. 2016 Bighorn 5th wheeler 3270 RS. Currently in the Great State of Kentucky for a week or so. Question: We've been using both AC units periodically during the entire trip. Just yesterday and today, we've noticed condensation (or frost?) on the bedroom ceiling. I washed out the little round air filters in the vents but nothing else. The moisture on the ceiling is directly beneath the front AC unit. Is this an indicator of something plugged up in the AC unit itself? Maybe a "frosty" refrigerant line or ... ? What could be causing this now and never has before? Additionally, high humidity outside (77%), temp only 75-ish. Thank you to all responders. FYI, I'm not an AC guy by no means; time to call the serviceman??

    John

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    Moderator danemayer's Avatar
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    Re: Condendation on ceiling

    Perhaps just an air leak letting the humid air in.

    Sounds silly, but before calling for service, make sure all your windows are closed fully.


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    Re: Condendation on ceiling

    Quote Originally Posted by danemayer View Post
    Perhaps just an air leak letting the humid air in.

    Sounds silly, but before calling for service, make sure all your windows are closed fully.
    Okay, will doublecheck the windows. Thank you. BTW to all, Niagara Falls, NY, is pretty awesome.

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    Re: Condendation on ceiling

    We just got back from a small outing, and I noticed the same issue on our rig too. Honestly we rarely use AC normally. Seems as if I have seen similar threads on here about this issue. The ceilings get sold cold they are sweating. Thats one reason they changed the build of the ceilings in the heartland coaches about two model years ago. The 2017 and up now have built up roofs, made with wooden rafter, and batt insulation with insulated duct work...... not made of laminated foam and aluminum structure anymore on the big country, big horn and landmarks anyway.
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    Re: Condendation on ceiling

    Quote Originally Posted by sengli View Post
    We just got back from a small outing, and I noticed the same issue on our rig too. Honestly we rarely use AC normally. Seems as if I have seen similar threads on here about this issue. The ceilings get sold cold they are sweating. Thats one reason they changed the build of the ceilings in the heartland coaches about two model years ago. The 2017 and up now have built up roofs, made with wooden rafter, and batt insulation with insulated duct work...... not made of laminated foam and aluminum structure anymore on the big country, big horn and landmarks anyway.
    I guess that makes sense. So apparently no "fix" except to buy a newer rig, and we ain't about to do that. So it's another one of those little problems we have to live with. I wonder if Mr. Biletti could comment, please? Thanks guys.

    John

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    Pennsylvania Chapter Leaders-retired travelin2's Avatar
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    Condendation on ceiling

    What Sengli says...we experience same in very humid locations like in SC along the shore. The cold air in the built in duct cools the hot ceiling causes sweating. Just like removing something cold from the fridge, it sweats. Once the humidity in the coach drops significantly the condensate does too.
    If you’re from AZ you likely don’t encounter that phenomenon there. We’re from the NE and when we go to the SW all the wood shrinks LOL! Here’s a picture of our cabinet door panels...

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    Re: Condendation on ceiling

    Quote Originally Posted by travelin2 View Post
    What Sengli says...we experience same in very humid locations like in SC along the shore. The cold air in the built in duct cools the hot ceiling causes sweating. Just like removing something cold from the fridge, it sweats. Once the humidity in the coach drops significantly the condensate does too.
    If you’re from AZ you likely don’t encounter that phenomenon there. We’re from the NE and when we go to the SW all the wood shrinks LOL! Here’s a picture of our cabinet door panels...

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    Well, that/s not good either! But I guess heat, cold, humidity, dryness explains it. Our trim shrunk like that too in places. Bummer! But thanks.

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    Senior Member Gary521's Avatar
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    Re: Condendation on ceiling

    There was a problem with the AC's built around that time with drainage in the ACs. Pull off the cover and see if there is excessive water on the support structure. If there is, there is a drawing that you can get that shows where to drill holes that allow better drainage from the support structure.

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