Go Back   iRV2 Forums > MOTORHOME FORUMS > Class C Motorhome Discussions
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 02-01-2016, 10:14 AM   #1
kmburns49's Avatar
Join Date: Jun 2015
Location: Mooresville, NC
Posts: 31
Question 15k BTU A/C in 33' Coach?

Will a 15k BTU A/C (ducted to front and rear) be adequate for a 33' coach (with a 4k genset)?
Adding a second 13.5k BTU unit in rear requires upgrade to 50amp service and a 5.5k genset. Weight could be a factor.

kmburns49 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 02-01-2016, 11:17 AM   #2
Senior Member
Join Date: Dec 2013
Location: Plantation, Fl
Posts: 913
Originally Posted by kmburns49 View Post
Will a 15k BTU A/C (ducted to front and rear) be adequate for a 33' coach (with a 4k genset)?
Maybe it will, maybe it won't. My bottom of the line Itasca class C 31K, is 32 1/2' long. It has a single 15,000 BTU ducted A/C which has been more than adequate each time I've used it, totally within Florida, throughout the year.
Others will join in to say you must have 2 A/Cs.

2014 Itasca Spirit 31K
Mich F is online now   Reply With Quote
Old 02-01-2016, 11:32 AM   #3
Senior Member
dwhit's Avatar
Join Date: Feb 2013
Location: Lake Hartwell, SC/GA
Posts: 509
Our last Class A was a 1999 34 foot Damon DayBreak with one "super slide". It had a ducted 15K Coleman MachIII. It cooled adequately...but then we didn't camp in Death Valley. If started in the morning hours it would stay comfy throughout a 95 degree day. Camping in the shade is always very important.

There are some that insist on 70 degrees on a 95 degree day with full sun exposure. It may take three a/c units to do that. Yet with major humidity removed 78 degrees feels cool.

I really liked the unit and I'd but it again...'cept we went to a TH that has 2 a/c's...yet the second a/c in the bedroom is barely usable. Sounds like a 120 inch S&S mtcyl engine idling 24 inches above our heads. Sleep is impossible. We don't use it.
2014 XLR 415AMP, 2011 F350 6.7 DRW, restored 82 Wing, 02 Shadow, 06 ST1300A, NRA Benefactors.
dwhit is offline   Reply With Quote
Old 02-01-2016, 12:06 PM   #4
Join Date: Feb 2014
Posts: 63
If it's over 90 degrees, then I don't think it'll be enough with that size RV. That single A/C might bring it down to an adequate level if you can tolerate a little higher temperature, but it'll also be running all day long. I'd bite the bullet and do it correctly up front.
drewtk is offline   Reply With Quote
Old 02-01-2016, 01:02 PM   #5
Senior Member
YC1's Avatar

Holiday Rambler Owners Club
Join Date: Jun 2011
Posts: 4,573
It would be marginal. Shutting the back half off and making sure you have windshield covering etc will work. I say marginal based on hot conditions. Being from Kalifornia and now Florida it would be uncomfortable. Shade would be important. I have owned a 30 footer with one. If you have double pane windows that would be a plus.
Myron & Deborah
08 HR Endeavor 40 SKQ
2012 Ford Edge Limited FWD 3.5L
Aluminator tow bar, Demco base plate
YC1 is offline   Reply With Quote
Old 02-01-2016, 01:06 PM   #6
Senior Member
Mr_D's Avatar
iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 22,386
Mostly depends on the insulation in the rig. We never had a rig that size with only one heat pump. Always had at least two.
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '05 Odyssey
Mr_D is offline   Reply With Quote
Old 02-04-2016, 10:02 PM   #7
Junior Member
Join Date: Feb 2015
Posts: 9
I've got the 2015 version of the same rig as Mich F. It's an Itasca Spirit 31K. The one ducted AC works well. I live in Central Texas and it gets plenty hot here. I have three items that mitigate heat to keep her reasonable in the summer.
  1. Replace all interior lights with LEDs. They use less power and run about 45 degrees cooler than incandescent bulbs.
  2. Purchase a roll of Reflectix from Home Depot and cut a piece the size of each window. I store them behind the couch when we don't need them. I put them in the windows in the summer and trap them in place with the window shades. The ones in the cab I cut a little bigger than the windows and just stuff them in the opening and they sort of stick in the recess around the windows.
  3. Purchased a white vinyl windshield wrap so the front is double covered between that and the Reflectix.

Put the carpet blind thing over the back of the cab to make the air conditioned space smaller. We find that a lot of heat is generated in the e450 cab. Trapping it up there helps. All those things make it comfortable inside but that A/C works it's tail off in August. It's comfortable, though.

My opinion is that 15K is enough and it's not worth the cost of another A/C and a more expensive generator and all that trouble.
jodpel is offline   Reply With Quote
Old 02-08-2016, 08:21 AM   #8
Senior Member
Campingman's Avatar

Workhorse Chassis Owner
Join Date: Nov 2009
Location: Angeles National Forest, LA Calif.
Posts: 1,097
I put a new 15k with heat strip in the front and put the old 13k in the back with a separate cord. I can run it off a genset or plug into pedestal if I need the second ac. So far I haven't had to use it.
Mark & Carole RVM54
What a long strange trip it's been
2002 Fourwinds 5000 26Q 496 ci. Chevy towing 2004 Jeep Wrangler,2016 Starcraft AR One 18', 2016 F-150
Campingman is offline   Reply With Quote
Old 02-08-2016, 08:40 AM   #9
Senior Member
JohnBoyToo's Avatar

Monaco Owners Club
Texas Boomers Club
Join Date: May 2012
Location: DFW, Tex-US
Posts: 3,502
As you can see from the responses...
it's a definite maybe, sort kinda

you can NEVER have too much ac IMHO !!!
If you really are sad and think nobody cares, just try missing a few payments ! '11 Monaco Diplomat 43DFT RR10R pushed by a Demco Excali-Bar II hitch which is pushed by a '14 Jeep Wrangler Unlimited Sport.
JohnBoyToo is offline   Reply With Quote
Old 02-08-2016, 01:57 PM   #10
Senior Member
George Schweikle's Avatar
Join Date: Apr 2004
Posts: 1,800
We have a 29 ft. Safari Trek with one ducted A/C and do this for maximum cooling:
- Double pane windows
- Aluminum material shade on the front windshield, and inside the bathroom skylight
- Lower awnings to shade side windows
- Insulating pillows in the roof vent recesses. Just like in cold weather, only you want to keep the heat out
- And if you are stopping after driving: open the hood - you will be surprised how much heat comes out, even with a class A
George Schweikle Lexington, KY
1999 Safari TREK 2830, FMCA 190830, Safari International chapter
1995 Safari TREK 2630, 1983 Winnebago Chieftain, 1976 Midas Mini
George Schweikle is offline   Reply With Quote
Old 02-08-2016, 02:37 PM   #11
Senior Member
wildtoad's Avatar
Join Date: Jul 2010
Posts: 2,374
Close off the front cab as mentioned, make use of shade or make your own my using the awning, and start the AC early.
Tom Wilds
Blythewood SC
2016 Newmar Bay Star Sport 3004
wildtoad is offline   Reply With Quote
Old 02-08-2016, 03:00 PM   #12
Senior Member
Mr_D's Avatar
iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 22,386
Originally Posted by George Schweikle View Post
- And if you are stopping after driving: open the hood - you will be surprised how much heat comes out, even with a class A
Yep, some DP's like ours, even have an over the road air con for the bedroom as well as the dash air.
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '05 Odyssey
Mr_D is offline   Reply With Quote
Old 02-09-2016, 07:36 AM   #13
Senior Member
Damon Owners Club
Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 21,176
Like so many things it depends.. Right now I'm "Stuck" in S.E. Ga and a Zero BTU A/C is all I need today.. Baby it's Cold Outside per GA standards ((40F) as I type, so an open window and the Fantastic fan is more than enough, in fact since it's blowing I have heat on (1500 watt controlled). Come August I have a 13,500 and a 15,000 in a 38 foot RV and it's not enough during the day (OK for sleeping but during the day it gets up to aroud 90 in here) No shade here)

Normally I summer in Eastern lower MI (Thumb or just S of it) and even there I'm glad to be on a 50 amp site cause 15,000 is a bit ... Anemic.
Home is where I park it!
wa8yxm is offline   Reply With Quote
Old 02-09-2016, 04:54 PM   #14
Senior Member
Join Date: Aug 2013
Posts: 197
For what it is worth, I went with the 2nd A/C and 50AMP service - The heat in the summer time here is in the mid 90s with gobs and gobs of humidity. On any day, the best I could do is 80 inside with the sun beaming down. Tried everything.

I bit the bullet and added another 15K in the rear and also 50 amp service installed. I chose to not go with a larger Genny. I can almost run both on low with nothing else but either way 1 running down the road is fine. Night time was never an issue so staying at a Walmart was always fine.

The only downside is that the coach wasn't designed for 2 units so you find that one unit or the other will out cool and ultimately keep the other from coming on...but man does it cool down quickly can hang icicles when I want to.

As good as the second unit is - I may have been able to get by with just the new unit as it is extremely efficient and runs circles around the older(2 year) Dometic.

My 2 cents worth.

Mickey Alberto
2016 Georgetown XL 350TS
Sour Lake, Texas
cmalberto 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 Owner of Country Coach Corporation: Winnebago! gpete1961 Country Coach Owners Forum 82 01-24-2016 11:59 PM
Do you stay cool with only 1 A/C unit? RUReady2Go 5th Wheel Discussion 42 07-16-2015 08:20 PM
Newbie needs Chassis A/C Help...pleses RobRoy Monaco Owner's Forum 10 07-15-2015 06:49 PM
Coach A/C vs. Cab A/C, Better fuel economy... fact or fiction? Mark Spears Class C Motorhome Discussions 13 08-15-2014 04:43 AM
Alliance Coach & Source Engineering RonaldNC Monaco Owner's Forum 9 03-23-2014 09:00 PM

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 11:34 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.