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Old 02-01-2014, 06:45 PM   #1
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Fogged up windows..

Just had our first shake down for 3 days at the ocean. Everything was fine until we put out the slider in the couch/dine area. Every window in the coach was fogged up for the 3 days. It poured down rain and was in the high 30 low 40 degree area. Had the main furnace on plus a small electric heater.

Anyone have this problem?

No one in the park with a rig close to ours had fogged windows.

Help !!
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Old 02-01-2014, 07:00 PM   #2
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Next time try opening a vent and or a window just a hair.
Sounds like you had the trailer sealed too tight.
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Old 02-01-2014, 07:01 PM   #3
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This could be normal ,all the moisture that the furnace produces especially since the weather outside is cooler and the temp inside the coach , I would assume is around 70. The weather outside just multiplies the humidity level. I noticed in my trailer on cold nights and the bunkhouse slide is out and we raise the temp inside the condensation starts to buildup in the upper roof corners in the upper bunk area. This is all normal. try getting a container of damp rid at your local hardware store. It took care or our issues. Its a bucket of moisture absorbing substance, it work great. Happy camping.

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Old 02-01-2014, 07:08 PM   #4
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Thanks 'Ford Idaho'...we did have the windows (on the lee side) but it didn't change anything.
"Snapper"...stopped at 'Camping World' on the way home but they couldn't come up with anything. Is the thing you are talking about called "Damp Rid" ? Thank you.
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Old 02-01-2014, 09:20 PM   #5
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Yes it is. I'm sorry I could not remember the name. During winter storage and during the colder season I keep a bucket inside the trailer. I usually place it under the dinette when we are not eating. Then move it when we are. The stuff works great. When you placed your slide out all that extra siding and roof now are exposed to the cold weather and also the rain in your situation. Propane when it burns puts off a lot of moisture, adding to the issue. Try it I think you will be happy. Let me know either way..

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Old 02-01-2014, 09:52 PM   #6
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This is a great resource for dealing with condensation - Window Basics | Understanding Condensation
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Old 02-01-2014, 10:01 PM   #7
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If you are going to be doing a lot of camping near the ocean in cooler weather I recommend getting a dehumidifier. Will work much better then the damp rid.
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Old 02-02-2014, 01:53 AM   #8
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Thank you all, so very much appreciated.
I guess we need to think back to our power boating days. Damp always needed to be dealt with. We had a dehumidifier on the boat, but of course it went with the sale.
On this ocean trip we had 3 or 4 windows cracked and the roof vent fan that you could either push or pull air on. Nothing was taking it out. Have heard of damp rid and understand the probable need for a dehumidifier. Just wonder why none of the other motorhomes we were with had the same problem. (Guess they figured things out long ago).
Thanks again, you all are great.
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Old 02-02-2014, 07:06 AM   #9
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If you were at a full hook up campground, they were probably using electric heat only, and not using their propane.
Electric heat doesn't add to the humidity. If anything, it tends to dry the air out a bit.
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Old 02-02-2014, 01:46 PM   #10
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Quote:
Originally Posted by snapper View Post
This could be normal ,all the moisture that the furnace produces especially since the weather outside is cooler and the temp inside the coach , I would assume is around 70. The weather outside just multiplies the humidity level. I noticed in my trailer on cold nights and the bunkhouse slide is out and we raise the temp inside the condensation starts to buildup in the upper roof corners in the upper bunk area. This is all normal. try getting a container of damp rid at your local hardware store. It took care or our issues. Its a bucket of moisture absorbing substance, it work great. Happy camping.
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Just curious, how exactly does the propane furnace introduce moisture to the inside of the RV, when the combustion by-products are exhausted to the outside. Thanks.
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Old 02-04-2014, 01:57 AM   #11
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Only a % of the moisture is expelled out the exhaust. The inside of the trailer is warmer than the outside temp. Which causes the moisture to build. Warm air is expanded and the colder air is dense and dry. For example when you drive your car during colder weather and you do not use the defroster the car starts to fill with moisture from the passengers breath and body heat. During the summer the warmer outside temps equal the inside temps of the trailer. Usually within 10 degrees of each other. Which equalizes the humidity and moisture between the 2. That's is why it happens in the colder weather because of the difference the 2 Temp's.



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