RV News RVBusiness 2021 Top 10 RVs of the Year, plus 56 additional debuts and must-see units → ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 06-03-2018, 12:14 AM   #1
Junior Member
Join Date: Aug 2015
Posts: 24
Modifying Ducted Roof Air Units


Just returned from a long 10 day trip camping along the Colorado River where temperatures were in the low 100's. We do this ever year and really enjoy it.

I have a 2008 Fleetwood 40x- it has a little darker colors and seems to retain the heat inside the coach. I have cut window shades using the thermal reflective sheets for the front windshield and many of the windows and we also use the awnings/window awnings and it helps to cut down inside temp.

Even with all of this, it seems like the 2 roof air units struggle to keep/maintain temp- they never shut off and really never get to the desired temperature that I have set the thermostat to.

My question- Has anyone looked at the 2 AC units and done any modifications to get better performance and help quiet them down? I was reading something on another site about replacing both intakes with 2 residential style intakes and filters which helped increase air flow throughout the coach for faster cool down and the noise dropped as well since it wasnt "choking"

Any input would be greatly appreciated.

Meaney77 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 06-03-2018, 07:16 AM   #2
Senior Member
lrsses's Avatar
Join Date: Feb 2016
Posts: 637
Suggest you clean a coils on both A/C units check your local auto parts store a coil cleaning spray. I had that problem but after cleaning itís a lot better
Larry and Sheila 2004 Sea Breeze 8321 Lx
Retired U.S. Air Force (SAC) Vietnam Veteran
lrsses is offline   Reply With Quote
Old 06-03-2018, 07:20 AM   #3
Community Moderator
Spdracr39's Avatar

Monaco Owners Club
Join Date: Jul 2016
Location: Central, Arkansas
Posts: 7,380
you can build quiet covers over the air intakes that will insulate from the noise (and hang down from the ceiling) but you are not going to increase intake airflow because no matter what you build the air still has to go through the same intake hole in the unit.
2004 Beaver Monterey Laguna IV
Cummins ISC 350HP Allison 3000 6 speed
2020 Chevy Equinox Premier 2.0t 9 speed AWD
Spdracr39 is offline   Reply With Quote
Old 06-03-2018, 10:20 AM   #4
Join Date: Jan 2018
Posts: 31
While there about 50 things less expensive to try first, we swapped our Dometic Brisk Airs for Atwood Air Command units and are very happy. Dometic were SO LOUD. Atwood VERY quiet. Cools better too. Supposedly less amp draw also.
jlreeves is offline   Reply With Quote
Old 06-03-2018, 10:53 AM   #5
Senior Member
MikeO58's Avatar
Join Date: Jul 2017
Posts: 434
Remove your air and return covers and check for any obstruction in ducting. In my last motorhome I found a flap of duct tape that would partially block air passage when air kicked on. I corrected the issue and it really helped quiet things down. You may need an inspection mirror to see in some of the passages.
Mike & Kelly
2017 Discovery 40E Freightliner Cummins 380hp
2017 Jeep Wrangler Unlimited
MikeO58 is offline   Reply With Quote
Old 06-03-2018, 08:04 PM   #6
Senior Member
Thor29.3inAZ's Avatar
Join Date: Apr 2017
Location: WA
Posts: 118
So.....I'll give you my experience with our AC (and we live in AZ). So after complaining to the dealer about the A/C being worthless, they checked the plate between the cold air and return air at the AC (where the cover is). They taped it off as to make sure the cold isn't being sucked into the return air. It worked...... but not all that good. So after still not getting the cooling I thought it should be doing, I did a little probing myself. I took down all the vent registers and stuck my phone camera up into the ducting. What I found was kinda funny but not, the foam ducts extended the length of the ceiling, past the last vent. So I bought some foam sheets and cut them to the size of the ducts, taped them into place with some AC foil tape at the duct. Both ends of the coach. The other place where it seemed to be loosing cool air was around my roof vents. I could touch the frame work and they were quite cold! Come to find out, the rear fan opening was set up for a second A/C unit (wiring and such). So I again, cut pieces to cover the A/C duct opening at the fan. At the end of each vent I closed off around 2 to 3 ft of ducting so the air was now being directed right to the vent. We find that after closing off the extra ducting with foam and taping it closed, we now have a pretty good amount of cold air going to all of the ducts now. Made a big difference in being able to cool the entire coach.
2017 Thor ACE 29.3
Thor29.3inAZ is offline   Reply With Quote
Old 06-03-2018, 09:18 PM   #7
Senior Member
RustyTools's Avatar
Monaco Owners Club
Join Date: Feb 2008
Posts: 2,045
Modifying Ducted Roof Air Units

Oops, wrong forum
2008 Camelot 40í PDQ
RustyTools is online now   Reply With Quote
Old 06-03-2018, 09:46 PM   #8
Senior Member
Join Date: Jan 2015
Posts: 1,080
If you RV in areas that have high humidity a dehumidifier helps. We have a 30 pint Danby with the drain going through a 1/4 inch hole in the floor. We spend a lot of time on the Texas coast with humidity 80+%. with the dehumidifier the coach humidity is 45 to 50%.
redcolorado is offline   Reply With Quote

air, roof

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
A/C: Ducted or non-ducted henboy Travel Trailer Discussion 32 07-27-2017 07:39 AM
Ducted Roof Air removal for rubber roof replacement supertramp Travel Trailer Discussion 3 01-10-2017 04:04 PM
Mounting a roof rack or box on Fiberglass/ducted roof 86scotty MH-General Discussions & Problems 16 06-23-2016 12:42 PM
Roof Air Conditioner Filters with Ducted Air bmfickl Class A Motorhome Discussions 9 03-16-2016 07:51 PM
Air conditioner help - ducted to non ducted 53block RV Systems & Appliances 14 07-29-2013 09:27 AM

All times are GMT -6. The time now is 05:20 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.