Condensation In TT on Cold Mornings

We also live in the PNW.. land of mold and mildew...lol We have been trying to educate ourselves on the absolute best way to winterize our 20' TT. It's just not this damp where we came from originally. We've read and read... and READ. Had no problem with doing the RV antifreeze part etc, removed all food, candles etc..but still have some humidity concerns.

We found a good sized home dehumidifier on Craig's last summer, and set it up today. It's been raining hard off and on today - soggy soggy.

We did our final cleaning/winterizing earlier today. We closed down the vents and turned on the dehumidifier (it's placed in the bathtub on a rubber mat). The humidity showed at 82% in the rig.

In 3 hrs the humidity had dropped to 60% and there is 1" of water in the lg reservoir of the unit. I'd say it's doing okay. Is there an optimum humidity % we should strive to keep the TT at?

Any more tips/do's/don't would be greatly appreciated. We think we did it right, but if there's more for us know please sound off.

Thanks in advance!
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Our last two RV trailers were the newer aluminum framed with the sandwich sidewall construction. Condensation is a huge issue unlike our other older units with wood framed sidewalls and rolled batt insulation which were warmer and much quieter.

We lived in a 27" aluminum framed with the sandwinch sidewalls for one winter here in northern Oklahoma. Temp down in the single digits on occasion with 35-40 mph winds much of the time. Condensation was a very big issue.

I skirted the 5er with mobile home skirting which helped keep the cold out of the floors. I made 1/8" Lexan storm windows for all the many windows. That also helped keep the trailer much warmer but still had moisture issues

We tried cracking the vents but all that accomplished was a colder/drafter trailer which caused the heater to run twice as much. We were using a 30 lb propane bottle every third day when it was cold.
We set two 12" fans up but all that did was move the same air around. Who wants to live with a fan blowing air around in the winter. Still had the same condensation problem.

Finally our RV dealer service mgr who lives just down the road says to get two dehumidifiers. We tried one but found it took two to finally get rid of our condensation problems.

We do the opening of the roof vents a small amount which helps us...

Since we do alot of camping off the batteries we really like the O2COOL 10-inch fans from WALMART/LOWES that operate from both 120VAC using a xfmr and internal D-CELLS batteries. These move alot of air inside the trailer...

Having the fabric tent ends adds even more problems with condensation. Everything that sticks out drips water haha... The metal tent bows inside the tent bed ends are very known for dripping water on your nose haha...

ALways a good idea to have a couple these fans around...


Roy Ken

herbhofmann wrote:
My DW and I went on our first October camping trip and first night out when it was cold enough to get condensation inside the TT.

Question: What is the best way to prevent this? Not only the windows were wet, but also along the aluminum framing. Our first TT was Stick and Tin (and old) so we never camped this late in the year.

My thinking is to keep the trailer a bit warmer at night (DW likes it COLD) and keep the vents open (got Maxairs on order). What do ya'll think?

Open the roof vents about an inch.

We camp a lot in the cold.

Never had a condensation issue.

First, laminated trailers use sandwiched walls with aluminum tubing for strength. The aluminum tubing conducts the outside cold to the inside of the wall, resulting in condensation on the wall. Wood framing doesn't do this.

If you have the furnace on and have a truss roof with insulation, you shouldn't have any type of condensation. If you have a laminated sandwiched roof, you'll likely have the same cold conduction through the aluminum tubing.

You should leave the heat on to warm the interior surfaces so that they don't condense any moist air.

If you don't have double pain windows, you will have a lot of condensation on the windows. You can leave the windows cracked and any roof vents cracked to allow enough air flow to remove humidity.

Or you could buy a small $200 dehumidifier, find a way to rig a hose to go out through a hole in the floor, and let it drain automatically through the hose. Or find a dehumidifier than uses a switch for auto shutdown and alarm, so that you can empty the tank when it's full.

We've camped also in the Pop Up in the 30s and just keep 1 window at each bunkend opened about 3" X 4" and keep the heat around 55 deg. f. with warm clothes and blankets. We keep the heat up more when awake. The pop ups go through propane fast since they're just tents with no insulation. ;)

Love cold weather camping, hate hot summer camping but it's still better than not camping at all. With kids in school, you make sacrifices. :)

anaro wrote:
FL was the first time I've seen it accumulate on the ceiling like that. It was August in FL so hot and humid are the norm. I will watch it next summer and see. Humidity sucks around here. I fight mildew all summer long. unfortunately with the trailer in the storage lot I can't run a dehumidifier. I'm gonna try damp rid next summer.

We're in Clermont, FL. In September, we were at Fort Wilderness and had no condensation, but there was defintely an issue with humidity/dampness at night. During the day, the humidity was fine, but during the day, with the sun and higher temps, the A/C compressor was on longer. At night, it would cool enough to decrease the compressor "on time". This decreased the ability of the A/C to remove humidity from the air. Plus, we were in a preferred site (loop 200) with the lake nearby and the canal right behind us. We're looking at getting a nice small dehumidifier (one with a compressor).

Elec blanket at night. Elec heater during the day.

We use electric heater no condensation.actually too dry, kids sinus acted up overnight.

FL was the first time I've seen it accumulate on the ceiling like that. It was August in FL so hot and humid are the norm. I will watch it next summer and see. Humidity sucks around here. I fight mildew all summer long. unfortunately with the trailer in the storage lot I can't run a dehumidifier. I'm gonna try damp rid next summer.