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 08-07-2014, 05:07 AM   #1
Senior Member
Dwayne & Shara's Avatar
Join Date: Apr 2012
Location: on the rainbow
Posts: 1,528
A/C choice?

I have 2 13,500 btu a/c ' s but I can only run one at a time and in the heat of 90+ it will not cool down the hole coach. Unless I start the generator to run both. Last week the front A/C died so I'm thinking of going to a 15,000 btu my RV is a 33' HR 30 amp do y'all think the 15,000 btu will work better when I'm on shore power?

Time is life! money is just a tool. how much of your life is a tool worth?

RVM481968 eagle 475hp Detroit 8v92
Dwayne & Shara 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 08-07-2014, 05:25 AM   #2
Senior Member
Join Date: Apr 2013
Posts: 271
I don't think it will work much better, but will draw more power. With 2 ac units, you should have 50 amp power Ann be able to run both ac units without depending on the generator. Not sure why that is not an option for you unless you are at a site that only has 30 amp service. There are some newer dometic or Coleman units called Mach 3 that are 13.5 k but draw less amps. Good luck

jdoran1973 is offline   Reply With Quote
Old 08-07-2014, 05:38 AM   #3
Senior Member
Dwayne & Shara's Avatar
Join Date: Apr 2012
Location: on the rainbow
Posts: 1,528
My RV only has a 30 amp line it's a 1990 they didn't offer 50 amp on this one. But the generator is a 50 amp 2 poles a 30 amp for the coach and back ac and a 20 amp for the front ac. So on the generator you can run both ac's but not on shore power
Time is life! money is just a tool. how much of your life is a tool worth?

RVM481968 eagle 475hp Detroit 8v92
Dwayne & Shara is offline   Reply With Quote
Old 08-07-2014, 06:38 AM   #4
Senior Member
ronspradley's Avatar

Gulf Streamers Club
Join Date: Mar 2011
Location: Central Texas
Posts: 1,828
My 1993 Gulfstream was 30 amp when I purchased in late 2010. And I could run either front or back AC when hooked to 30 amp shore power, or both when running generator. I re-wired my coach to 50 amp so I can now run both AC's when on 50 amp shore power. Not too complicated. And you can search the forum here for details about how that is done. Also some run an extra, heavy duty, 20 amp cord to the coach that just runs one AC. So you can hook up your 30 amp cord for the coach, and then hook up the extra 20 amp cord to be able to run that second AC.

Trying to keep these coaches cool in summer is a chore. Two weeks ago I was camped on the Guadalupe River below Canyon Dam Texas and the shore power was only 30 amp. I had to run just the front AC with rear of coach closed. Site was full sun, facing West. Kept front of coach no higher than 78 during the afternoon heat.

Best of luck with keeping cool.


1995 Monaco Windsor DP 32'
1993 Gulfstream Sun Voyager DP 30'
Toad 1998 Honda CRV, 2006 Honda CRV
Life's too short to drink cheap beer.
ronspradley is offline   Reply With Quote
Old 08-07-2014, 07:11 AM   #5
Senior Member
seasonedsole's Avatar
Mid Atlantic Campers
Ford Super Duty Owner
Join Date: Sep 2010
Location: NE PA
Posts: 154
To answer your question, yes. 15,000 BTU will only take a few more amps than your 13,500. That would be my choice.
Doug and Lisa, FMCA 436113
2006 Fleetwood Providence 39L
350 HP Cat, Spartan, 24' ATC enclosed
Subaru Outback, Cricket SW3
seasonedsole is offline   Reply With Quote
Old 08-07-2014, 07:28 AM   #6
Senior Member
mevman's Avatar
Fleetwood Owners Club
Freightliner Owners Club
Join Date: Feb 2012
Location: Little Rock, Arkansas
Posts: 152
I also ran a second line to power one A/C from shore on a 20amp service and the other 30amp main runs the other A/C. I don't think the 15K btu will give you the cooling you need vs the 13.5K and will draw more power.
'08 Bounder 38S, Toad-'10 Ford Ranger Supercab
Happy trails,
Rich & Margaret, Shih-Tzu's 'Tinkerbelle' & 'Annie'
mevman is offline   Reply With Quote
Old 08-11-2014, 04:48 PM   #7
Senior Member
Join Date: Nov 2011
Posts: 103
I replaced my 7 year old 13.5 with a 15 Very satisfied w/result However not sure how much of the improvement was a poor performing 13 vs more powerful 15 If you have to replace 13 then the minimal additional cost of a 15(at least in my case) is worthwhile
glemo81540 is offline   Reply With Quote
Old 08-11-2014, 05:14 PM   #8
Registered User
Join Date: Mar 2013
Posts: 1,919
The newer A/C units seem to draw less amperage (especially at start up). So if you get a newer 15K unit or maybe replace both 13.5's you may not need to make any changes. My first coach was 36' long with no slides and single 15K central air unit. It cooled the coach pretty well but was power hungry. My new to us coach is still 30amp service but has dual 13.5K units and have no issues at all with power. I can even power the coach off of a 12/3 100' extension cord if needed. That's actually what I use when the coach is at home getting ready for a trip with the A/C on.

jamesrxx951 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
2012 Discovery 36J A/C Temp Sensor Location pagosajoe Fleetwood Products Owner's Forum 29 11-14-2014 09:48 AM
Roof A/C 2014 Solei 34T mikekohut Winnebago Industries Owner's Forum 6 10-03-2014 07:05 AM
A/C Generator question Joe Jeffries National RV Owner's Forum 24 08-07-2014 07:51 AM
Advice on Class A with 2 a/c or 3 a/c units Michele O Class A Motorhome Discussions 8 06-25-2014 11:25 PM
Rear A/C Issue Koop Alpine Coach Owner's Forum 10 02-21-2014 07:28 PM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 03:51 AM.

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