Ceiling registers sweating

[csp]

Is there a way to keep the ceiling registers from sweating when running the AC. It seems like they sweat more when it is hotter outside. I do not want them dripping on my new laminate flooring.
Thank you for any help.
Chris

[NALSO]

Do you have condensation running off your roof?
It sounds like a plugged condensate pan, you will have to go on to your roof, remove the A/C cover and check for any blockages on the drain pan, such as leafs or other debris.

Henry.

[RV Wizard]

In high humidity conditions the coolness of the ducts and vents allows the moister in the air to condense on these surfaces. Once you get the air dried out the condensation problem will go away. This is not an easy thing to do as when you go in and out you let the high humidity back into the coach. You could get a dehumidifier to also reduce the dew point.

[NeilV]

Steaming cups of coffee/tea, pots boiling on the stove, showers and just the presence of living things can cause this espcially in the confines of a motor home. Using the vent fan while cooking and showering can help with this as will limiting the number of uncovered containers of liquids in your coach. Even potted plants can add to this problem.

Did this just start to happen or has this been the case all along and you are now concerned due to the new flooring?

As others have mentioned if your AC condensate pans/drains and cooling coils have neot been cleaned in a while it may be a good idea to give them some service.


To sum it up you can:

Limit the boiling or steaming of foods while cooking durring the times of day when this is most prevelant. Take shorter cooler showers. Use the vent fans when creating humidity (cooking/brewing coffee/steeping tea/showering). Limit the number of potted plants in your coach. Limit your trips in and out of the coach and the amount of time the door is left open.

Consider changing the AC outlets to less shiney ones as mat finishes are less prone to accumulate condensation or use an anti-mist or anti-condensation product that is safe for plastics on the vents such as:

Anti-Mist :: Winter Products :: Holts Auto

If the condition is extreme you may also need to consider getting a small dehimidifier.

[94-Newmar]

All my ceiling A/C vents sweat too when it's really hot/humid out. It seems to correct itself once the humidity levels and temps come down.

[csp]

Thanks for the responses. Yes there is water running off the roof and it only does it when it is really humid. It seems to stop when it gets cool in the coach. I
I guess when I just painted them, I should have not painted the gloss white.
They never sweat enough to put much water on the floor so I guess I will use a humidifier or lay down towels until it cools off inside.
Chris

[TXiceman]

Check your air filters and run the fan on high. That should help. The problem is the air coming off the coil is so cold it has the duct plastic below the air dew point, so the moisture condenses on the cold surface.

How cold are you trying to keep the RV inside?

Ken

[csp]

Ken
I am keeping the air on about 73.
I will try running the fan on high. I usually run it on auto.
Chris

[TXiceman]

Also, bring the temp up to about 75 or 76 deg F. part of the problem is if you are at 73 deg F, the air is coming off the unit at something around 53 deg F. That means the ducts and registers are also this cold. You would have to look at a psyc chart o see where you are operating. I would also need the wet bulb temperature.

Ken

[Ray,IN]

One thing you can do to reduce condensation in hot, humid weather is to leave the A/C operating 24/7, don't open windows at night. This lets humidity permeate every fabric of your RV. Next day you start the A/C, and it now must remove all that humidity you allowed to soak into your sofa, and other stuffed or fabric covered furnishings. We discovered this by accident. We both have asthma and allergies, which often requires conditioned air.

Ken, wouldn't the evaporator air temperature be the same when the compressor is operating, whatever the thermostat setting? We have ceiling ductwork for our heat pumps. I have had the thermostat set at 68* on 90* days and never experienced condensation on the ductwork or ceiling outlets.