I have a 2019 Raptor 355TS with 3 13.5k ac units. The first two years of camping the humidity seemed to be pretty consistent although I never measured it. Now that I am measuring it (been waking up in the middle of the night hot) the temperature stays pretty consistent 66-68 degrees overnight but the humidity swings between 50 - 80 percent in a 10 hour period. The outdoor conditions overnight are 75 degrees and 80% humidity. Where is all of this humidity coming from and why don't the AC units seem to keep up with it anymore? Help!

Hi,It may seem odd--but use an electric heater to force the air conditioners to extract more water.

You need to do an inspection of the bottom of your unit. Find any access for air and close it up. I noticed on my unit that the storage area is directly connected in two locations to the inside. A floor vent in the bathroom and a vent under the steps. Any warm moist air getting into that storage area will condense when it touches colder surfaces. Make sure all access doors to the storage are closed. After that you might want to check your air conditioners to make sure the coils are clean. It's not hard to do. Go up on the roof and remove a few screws to get the cover off. You can buy a can of coil cleaner at wallyworld. If the coils are covered with gunk they will hold moisture instead of shedding it. Check the inside part of the unit also. Also make sure your drains are clear so the water can get away from the a/c.If none of that gets you anywhere, I would look at a dehumidifier before a heater. It will remove water. The problem is it will also generate heat.

Showers, cooking, etc.. all add humidity, particularly showers. Use the bath vent when showering and the exhaust fan when cooking to help reduce the humidity. Running a stand alone dehumidifier would help dramatically.

eHoefler wrote:Showers, cooking, etc.. all add humidity, particularly showers. Use the bath vent when showering and the exhaust fan when cooking to help reduce the humidity. Running a stand alone dehumidifier would help dramatically.Great advice! Using a dehumidifier makes a big difference.

The moisture in an RV comes from everyday living. You breathe and each breath puts out moisture in the room. Cooking and showering add moisture to a room.When it is cool out, the A/C unit does not run as the sensible heat load in the room does not increase enough to make the A/C operate. The A/C will not remove moisture from the air unless the A/C is running, and the evaporator coil is cool.One suggestion is to run a small space heater to put a heat load in the room which will force the A/C to operate. We frequently do this in cooer damp weather.You can go out and buy a mechanical or refrigerated dehumidifier, but it is nothing more than a small A/C unit that takes the refrigerated and dried air over its own condenser to drive the air temperature up and away from the evaporator dew point. Thid decrease the relative humidity.What is relative humidity in simple words?Relative humidity (RH) is a measure of how much water vapor is in a water-air mixture compared to the maximum amount possible. RH is a ratio of the humidity ratio of a particular water-air mixture compared to the saturation humidity ratio at a given temperature (dry-bulb).Ken

Help with high humidity | Good Sam Community

eHoefler
Explorer II
Aug 11, 2022
Showers, cooking, etc.. all add humidity, particularly showers. Use the bath vent when showering and the exhaust fan when cooking to help reduce the humidity. Running a stand alone dehumidifier would help dramatically.
schlep1967
Nomad
Aug 11, 2022
You need to do an inspection of the bottom of your unit. Find any access for air and close it up. I noticed on my unit that the storage area is directly connected in two locations to the inside. A floor vent in the bathroom and a vent under the steps. Any warm moist air getting into that storage area will condense when it touches colder surfaces. Make sure all access doors to the storage are closed.
After that you might want to check your air conditioners to make sure the coils are clean. It's not hard to do. Go up on the roof and remove a few screws to get the cover off. You can buy a can of coil cleaner at wallyworld. If the coils are covered with gunk they will hold moisture instead of shedding it. Check the inside part of the unit also. Also make sure your drains are clear so the water can get away from the a/c.
If none of that gets you anywhere, I would look at a dehumidifier before a heater. It will remove water. The problem is it will also generate heat.
pianotuna
Nomad III
Aug 11, 2022
Hi,

It may seem odd--but use an electric heater to force the air conditioners to extract more water.

Forum Discussion

Help with high humidity

About Fifth Wheel Group

Related Content

High humidity

Humidity

Hot humid camping

Does humidity affect refrig. cooling?

AC and humidity problems.