Thread Tools Search this Thread Display Modes
Old 07-30-2014, 05:16 PM   #1
4 Rivet Member
Cannonball's Avatar
2014 22' FB Sport
San Antonio , Texas
Join Date: Jan 2014
Posts: 490
Images: 1
Dehumidifier Use with A/C

2014 Sport 22 FB, 13.5 Dometic A/C. A/C works fine, drain line not clogged, drips water like crazy from the drain line. My issue is the balance between indoor and outdoor temperature overnight, and the dehumidification process.

We run the A/C overnight and will wake up to an indoor temperature between 72 & 75 degrees per my little portable thermometer. Outdoor temperature will be around 80 degrees. The same thermometer also gives a humidity reading, and when we get up it is not unusual for that reading to be 80% or more humidity. My conclusion is that the outdoor temperature has dropped enough that the A/C does not have to run that much to keep the indoor temperature steady, and as a result the humidity level rises.

Would a small dehumidifier running overnight help in this regard? Should I open the roof vent a bit? Run the roof vent fan on low in addition to the A/C?

BTW, it is two adults and one 18 lb. dog sleeping inside overnight.

Cannonball is offline   Reply With Quote
Old 07-30-2014, 05:37 PM   #2
Rivet Master
Piggy Bank's Avatar
2017 25' Flying Cloud
2015 22' FB Sport
Kansas City , Missouri
Join Date: Apr 2014
Posts: 1,166
I would try opening your roof vent. Humidity will flow from higher to lower levels, independent of temperature.

Because the three of you exhaling all night does add humidity to the space. And the AC doesn't run much to pull out heat as the outdoor temperature cools.

Also try using the lowest setting so it runs longer at the lowest speed possible


Piggy Bank
Piggy Bank is offline   Reply With Quote
Old 07-30-2014, 06:15 PM   #3
Rivet Master
SteveSueMac's Avatar

2012 27' Flying Cloud
W , New England
Join Date: Oct 2012
Posts: 5,743
I've found that if I open vents while the AC is running, condensation builds up on the AC unit inside the trailer. I'm not sure why that is, but closing the vents always fixes that problem.

Are you getting condensation on the walls??
SteveSueMac is offline   Reply With Quote
Old 07-30-2014, 06:45 PM   #4
Rivet Master
HowieE's Avatar
1991 34' Excella
Princeton , New Jersey
Join Date: Aug 2003
Posts: 6,897
Images: 12
Trailer AC unit only control temperature with a side benefit of removing humidity while they is on. You would almost have to be in a desert where humidity was very low for an AC unit to satisfy both requirements.

You have 3 bodies in a tin can exhaling vapor. You idea of a separate dehumidifier would work towards lowering the humidity. You would wan to leave the AC on so the fan circulated the air. The limiting factor there is you have to be able to get rid of the water collected.

Defiantly keep the vents closed if you are attempting to lower the humidity.
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles

HowieE is offline   Reply With Quote
Old 07-30-2014, 06:48 PM   #5
Rivet Master
A W Warn's Avatar
2000 25' Safari
1999 34' Excella
Davidson County, NC , Highlands County, FL
Join Date: Aug 2006
Posts: 2,785
I keep the vents/windows closed while running the AC. The warmer air outside will be more humid than the cooler air inside.

For us, the exceptions are keeping a vent fan open above the shower during and for a while after we bathe. And, we run the vent fan above the range when we cook.

add edit: A dehumidifier gives off heat when it runs. The AC and dehumidifier will be competing, so your AC may not satisfy your cooling requirements when you run both. (I have a dehumidfier I use when the trailer is in storage)
2014 Silverado 1500 Crew Cab 5.3L maximum trailering package (yes, I'm towing the 34')
A W Warn is online now   Reply With Quote
Old 07-30-2014, 06:54 PM   #6
4 Rivet Member
Cannonball's Avatar
2014 22' FB Sport
San Antonio , Texas
Join Date: Jan 2014
Posts: 490
Images: 1
No wall condensation.

My thought with the dehumidifier would be to set it in the bath and run a drain hose into the shower or sink. No way it could fill the grey tank overnight.

Does anyone have a rec for a small dehumidifier?

Sent from my iPhone using Airstream Forums

Cannonball is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Heater + Dehumidifier question deauxrite Dehumidifiers & Ozone Generators 1 10-11-2009 07:31 PM
Dehumidifier Foiled Again Dehumidifiers & Ozone Generators 9 11-08-2008 11:58 AM
Dehumidifier for Bambi 19' CCD CAK 2005 and newer - Bambi all models 1 04-11-2006 06:11 PM
Dehumidifier? ipso_facto Interior Restoration Forum 0 02-09-2006 06:35 PM
Dehumidifier tincanholiday Dehumidifiers & Ozone Generators 8 09-08-2005 09:31 AM

Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 05:40 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.