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 08-19-2011, 09:31 AM   #1
Junior Member
Join Date: May 2009
Posts: 23
Larger A/C Help

Hi All,
Does anyone make an roof a/c with ducts that is larger than 15,000 BTU's?

caymandave 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 08-19-2011, 10:13 AM   #2
Moderator Emeritus
TXiceman's Avatar

Vintage RV Owners Club
Texas Boomers Club
Oklahoma Boomers Club
Ford Super Duty Owner
Join Date: Aug 2000
Location: Full Time, TX Home Base
Posts: 17,183
Blog Entries: 21
NO. You have to add another unit.


Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot
TXiceman is offline   Reply With Quote
Old 08-19-2011, 03:06 PM   #3
Senior Member
62Morgan's Avatar
Workhorse Chassis Owner
Join Date: May 2010
Posts: 271
What's your issue, Dave? Has it worked OK up until now; suddenly started to under-perform? You might try blowing-out your fins topside if they are clogged.
62Morgan is offline   Reply With Quote
Old 08-20-2011, 08:16 AM   #4
Junior Member
Join Date: May 2009
Posts: 23
Larger A/C

When it is over 90 the two of them on high will not keep the coach cooled.
I am not sure what size they are, but if they are 13000 btu units another 2000 btu's is not going to do the job.
I have tried cleaning and had the dealer service the units. They are just not big enough. Typical coach builders cheap!!!!!!!!!!!!!!!!!!!
caymandave is offline   Reply With Quote
Old 08-20-2011, 01:23 PM   #5
Senior Member
smiller's Avatar
Join Date: Jul 2011
Posts: 1,726
15k BTU is about the maximum for RVs because it represents about the maximum practical load for a 115-volt circuit (even if your rig has 50-amp 240-volt service it is split to two 120-volts legs at the panel and usually no full 240-volt service is available for internal electrical loads.) It could be wired otherwise and thus provide 240 volts to a much more powerful A/C unit, but that would mean that your A/C would not be functional at a campground without 50-amp service. Most owners would find unacceptable so it's generally not wired that way.
smiller is offline   Reply With Quote
Old 08-20-2011, 02:48 PM   #6
Senior Member
mythplaced's Avatar
Alpine Owners Club
Texas Boomers Club
Join Date: Jan 2009
Location: United States
Posts: 1,305
I just got baqck from Las Vegas.....109 degrees!

The two 15K's kept the inside to a chilly 79 degrees...

I was amazed....
Michael (Home base Northern IL)
USED TO HAVE; Alpine 40MDTS Now Dynamax DX3
mythplaced is offline   Reply With Quote
Old 08-21-2011, 09:05 AM   #7
Moderator Emeritus
Gary RVRoamer's Avatar

Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 19,361
2 x 15,000 BTUs should be enough for the square footage. If it was a house the a/c experts would recommend about 5000 btus for a 400 sq ft space. The problem is that RVs are poorly insualted vs a fixed dwelling and just aboyt every surface is an extyerior wall that heats up. They are are lots of windows, plastic skylights in the roof, etc. etc.

You will probably get better results by working on how the RV gains heat. Put "pillow' insulation in the skylights, reflective tint on windows (or foil backing), reflective sun shield in the windshield, window awnings to help sahe the, use the patio awning to keep sun off one side, and so on.
Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
Gary RVRoamer is offline   Reply With Quote
Old 08-21-2011, 03:13 PM   #8
Senior Member
doc's Avatar
Appalachian Campers
Join Date: Sep 2002
Location: Dixie !! (north Georgia) USA
Posts: 3,086
We are finding that the mostly black color and huge windshield of our coach makes it darn hard to cool in 90+ degree heat.
doc is offline   Reply With Quote
Old 08-21-2011, 05:26 PM   #9
Senior Member
Gary1965's Avatar
Fleetwood Owners Club
Join Date: Dec 2010
Location: Milwaukee, WI
Posts: 246
Get some external shades, it will keep the heat out and put less pressure on your air conditioners.
2010 Fleetwood Discovery 40G
Gary1965 is offline   Reply With Quote
Old 08-22-2011, 04:47 AM   #10
Senior Member
Jackm's Avatar
Workhorse Chassis Owner
Join Date: Nov 2005
Posts: 627
Gary' Brinck's comment is the bottom line. Instead of adding more capacity (which simply isn't practical), you need to reduce heat conduction by insulating your rig in creative ways. Windows and vents are the biggest culprits but cabinets can also be a weak spot. We added a sheet of one-inch blue board (foam insulation) to the back of our wardrobe and found that the bedroom stayed much cooler. We're going to do the same to the back of our living room cabinets. The other advantage of tightening up is less condensation in cold weather. In any case, find out where heat is getting in to your RV and do anything to slow it down. After that, you'll find that two roof ACs should keep you pretty cool.

2004 Winnebago Brave 34D with the usual add-ons
Jackm is offline   Reply With Quote
Old 08-24-2011, 03:36 PM   #11
Senior Member
62Morgan's Avatar
Workhorse Chassis Owner
Join Date: May 2010
Posts: 271
Target the 3 types of heat transfer conduction, convection and radiation:

Agree with the after-market insulation ideas. Especially the backs of wall cabinets [if only solely for saving contents from excessive heat]. A dead-air space is the best insulator, such as bead board insulation.Foam padding is next in line. Bubble wrap also but it has a short life-span. Just some obvious ideas...for the first "two" sources of heat gain.

But, for the third: Radiation,
I had Great success in adding batt insulation into the front cap, just behind my TV and stereo cabinetry. Huge improvement occurred when I added a foil radiant barrier behind batts[nearest to the cabin side].
Many people do not seem to understand unseen radiant heat ( solar infrared energy) often causes just as much heat gain as the other two transfer methods.

Many new homes have foil-faced attic insulation at the rafter level; thus giving the attic space a cooler effect than if foil was placed at the ceiling level.

62Morgan 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
New A/C Unit Compatability With Old (1996) Intellitec Control System tomnorman457 MH-General Discussions & Problems 3 10-05-2010 01:16 PM
Front a/c runs in fan position and stops on a/c position Wanabee FTer MH-General Discussions & Problems 2 09-29-2010 12:19 PM
Summer Ready Basement A/C Pubtym Winnebago Industries Owner's Forum 16 07-26-2010 03:28 PM
Kit Camper Projects - Project #7, Installing a Household A/C Unit RedneckExpress Vintage RV's 1 02-03-2008 09:18 PM
"Summer Ready" Basement A/C Pubtym Winnebago Industries Owner's Forum 7 06-30-2007 09:43 AM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 01:32 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.