Suggestions Wanted for Dehumidifier - Fiberglass RV

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Old 04-10-2019, 10:55 PM   #1
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Suggestions Wanted for Dehumidifier

Hi, I’m Donna. I’ve lurked on this forum and subscribe to the newsletter. This is my first post.

I’m looking for specific suggestions on dehumidifiers to use in my Casita when I’m not using it. I’d like a small one that I can run a drain hose to my shower or sink.

Normally I keep my trailer covered during the winter and out in lots of damp rid. This winter it was uncovered and we had LOTS of rain. As a result, I have excessive moisture inside. I did not vent it, and shades were up to let in sunshine. Condensation is a problem.

Anyone have suggestions for a specific brand of dehumidifier? Suggestions for whether I should keep it covered or uncovered? Any other ideas for keeping moisture out?

All suggestions are appreciated!! Thanks.

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Old 04-12-2019, 09:39 AM   #2
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Name: Robert
Trailer: 1987 Bigfoot B-17'
Posts: 26
We just leave it heated to about 55-60 degrees. That does the job for us.

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Old 04-12-2019, 09:53 AM   #3
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Name: Stephen
Trailer: Casita
Posts: 122
Exclamation Condensation Problem

Condensation is a potentially serious problem because of the rot and mold damage it can cause. It occurs when the internal temperature falls below the dewpoint of internal air. This often occurs when internal air is stagnant. Window condensation is particularly common because of the poor insulation quality of stock windows. By improving ventilation you can flush out moisture-laden stagnant air for fresh air with less moisture, This seems counterintuitive. So many owners close up their campers in the hopes of precluding water getting in which stagnates the warm moist internal air causing condensation. Improving ventilation will reduce condensation.

Another approach is to keep the internal temperature at normal room temperature. Then the internal air temperature does not go down to the dew point and condensation does not form.

By supplying AC power to your trailer you might run the heat strip in the air conditioner and the vent fan on low as a two-prong approach to reducing condensation.
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Old 04-12-2019, 10:27 AM   #4
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Name: Lee
Trailer: Casita
Posts: 347
I use one of these and there seem to be numerous companies selling this same model so you can search for the best bargain.
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Old 04-12-2019, 10:31 AM   #5
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Name: Byron
Trailer: 2006 Scamp 13' towed with a 2005 Dodge Dakota 4.7l Magnum W/full tow package (over kill)
Posts: 6,886
I use Dri-Z-Air and a small heater to keep the temps up a bit. 13 years of doing this has resulted on no mold or internal condensation that I have been able to detect.
Byron & Anne enjoying the everyday Saturday thing.
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Old 04-12-2019, 10:40 AM   #6
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Name: Lee
Trailer: Casita
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One of these will tell you what your humidity level is.{creative}&hvpos={adpositio n}&hvnetw=o&hvrand={random}&hvpone=&hvptwo=&hvqmt= e&hvdev=c&hvdvcmdl={devicemodel}&hvlocint=&hvlocph y=&hvtargid=pla-4583795260471590&psc=1
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Old 04-13-2019, 06:52 AM   #7
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Name: bill
Trailer: 2013 Escape 19; 1977 Trillium 1300
The Mountains of North Carolina
Posts: 2,078
I bought a small RV dehumidifier on Amazon. They sell several of them.
Check my Trillium Project Page:
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Old 04-14-2019, 06:12 PM   #8
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Name: Elliott
Trailer: 2017 19' Escape
Posts: 105
Usually for storage I'd suggest buckets of damp-rid, but it sounds like that wasn't sufficient. To me that means you need some pretty hefty dehumidification. If buckets of dessicant weren't enough, those little peltier-based dehumidifiers probably won't be enough either. You'll want a compressor-based one with a humidistat. All of those are bulky and expensive, unfortunately, but this one doesn't look too bad:

As others have mentioned some variety of heater may also be helpful in avoiding condensation. Since it just needs to keep interior temperatures up a little, something much lower-wattage than a space heater is probably the way to go. There might be better options, but this is the first one I found:
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Old 04-15-2019, 01:38 PM   #9
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Trailer: 19 ft Scamp (Egg Salad Annie)
Posts: 266
Hi Donna
We bought a Dehumidifier from Sears and put it on the table run the drain out the electrical line entrance. It works great
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Old 04-15-2019, 02:51 PM   #10
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Name: Shelby
Trailer: Casita SD
Posts: 350
I got one like this for the basement. It works well and has a variety of settings. You shouldn't need to run one very often. This one will suck the Casita below 50% in a couple of hours. I think there is a temp limit, below which they don't do much.
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Old 04-15-2019, 03:21 PM   #11
Name: Mac
Trailer: 2013 Casita 17' LD
Posts: 89
We live on the west side of the Oregon Cascades (the wet side). We use a Davis Air-Dryr 1000, leaving the trailer plugged in to A/C.
Currently, the outside temp is 44, and the humidity is 76%.
Inside the Casita, the temp is 50, and the humidity is 62%; often it's much lower.

This does the trick for us. I put some Dri-z-Air crystals in there once, and spilled the liquid that resulted. Nasty, corrosive stuff!
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Old 04-15-2019, 07:35 PM   #12
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Name: Jan
Trailer: 21' Escape
Posts: 11
We have one of the dehumidifiers that Lee mentioned above and it work great (you do have to empty out the tank). What we use is this: Keep the cupboard doors open, bench covers, etc. and everything should stay dry and warm.
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Old 04-20-2019, 10:41 AM   #13
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Name: Jerrybob
Trailer: casita
Posts: 99
We've been using this unit for hoses or emptying water. We live in very wet country....80 to 100 inches of rain per year. Our Casita is outside....I plug in this unit....set it on the all the cabinet doors and we have no moisture issues. They have been using these units on boats for years. Good luck and safe travels.
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Old 04-20-2019, 10:52 AM   #14
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Glenn Baglo's Avatar
Name: Glenn ( second 'n' is silent )
Trailer: 2009 Escape 17B '08 RAV4 SPORT V6
British Columbia
Posts: 5,950
Originally Posted by jerrybob View Post
We've been using this unit for hoses or emptying water.

So where does the moisture go?
You could just plug in a lamp with a 60 watt bulb to warm the air.

What happens to the hole when the cheese is gone?
- Bertolt Brecht
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