Home » Public Forums » GMCnet » [GMCnet] Is one 15000 BTU roof air unit enough? Or How many roof air units do you have?
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| Re: [GMCnet] Is one 15000 BTU roof air unit enough? Or How many roof air units do you have? [message #93995 is a reply to message #93989] |
Fri, 30 July 2010 12:00   |
Eddie Pettit
Messages: 71
Registered: May 2009
Karma: 0
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Agreed, it probably won't run two roof top air units. Norcold, it think it
was them, thinks that it might run two 11000 BTU units per Norcold's site.
However, I was mostly thinking of at the campground when hooked up to their
power.
Yes, the air filter was off during the photo op just for the repair.
Eddie Pettit
73 CL - The Jolly Roger
> -----Original Message-----
> From: gmclist-bounces@temp.gmcnet.org
> [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of
> dennisfsexton@aol.com
> Sent: Friday, July 30, 2010 12:50 PM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Is one 15000 BTU roof air unit enough?
> Or How many roof air units do you have?
>
>
>
> Eddie,
> From the photos, you appear to have a 4KW generator -- it is
> not usually large enough to run two roof airs.
> Most who are only using one AC have added roof and side-wall
> insulation and tinted the side windows.
>
> Back on your Onan, did you just have the air filter off for
> the photos?
>
>
> Dennis Sexton
> 73 Painted Desert 230
> Germantown, TN
> USA
>
>
>
> -----Original Message-----
> From: Eddie Pettit <eddie@thepettits.com>
> To: gmclist@temp.gmcnet.org
> Sent: Fri, Jul 30, 2010 11:40 am
> Subject: [GMCnet] Is one 15000 BTU roof air unit enough? Or
> How many roof air units do you have?
>
>
> As the subject states, in our coach, we're finding that one
> isn't enough.
> s anyone happy with one unit in 95F weather?
>
> hanks in advance.
>
> Eddie Pettit
> 3 GMC CL - The Jolly Roger
>
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| Re: [GMCnet] Is one 15000 BTU roof air unit enough? Or How manyroof air units do you have? [message #94001 is a reply to message #93998] |
Fri, 30 July 2010 12:32 |
Eddie Pettit
Messages: 71
Registered: May 2009
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Thanks, that's what I was figuring... We'll suffer our way though this
Summer and I'll add another unit over the winter.
I noted that in the rear by the roof vent, there are two wires, a black and
a white. Did the coach come from the factory wired for a roof air unit at
each roof opening? I don't recall the wiring at the very front hole.
Eddie Pettit
73 CL - The Jolly Roger
>
> NO, need two. Even with all my extra insulation, in Arizona anyway...
> --
> -Chr$: Perpetual SmartAss
> 77 Ex-Kingsley 455, Power Drive, 3:21 FD, Quadra bag. The
> Engineer's Motorhome
> Scottsdale, AZ
>
> Photosite: Chrisc "It has Begun"
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| Re: [GMCnet] Is one 15000 BTU roof air unit enough? Or How many roof air units do you have? [message #94009 is a reply to message #93988] |
Fri, 30 July 2010 14:42 |
GeorgeRud
Messages: 1380
Registered: February 2007
Location: Chicago, IL
Karma: 0
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When I acquired my 75, it had two of the original roof AC units. The unit above the door was obviously wired by the factory as it was shielded cable all the way to the unit. The rear AC had black and white wires powering it that had been tapped off the upper outlet in the hallway, and no 12 volt leads. The forward hole had a vent that had factory 12 volt wiring but no 120 volt connections.
Hope this helps! I ended up installing a couple of Fantasic Fans in the two outer holes, and a Carrier Low Profile 15,000 btu unit above the door. I'll know later this summer if that's sufficient or not. I run the unit with my Generac Prime-Pac 50 and it seems to handle that load very well. I don't know how it would do with two ACs, but may have to find out some day if this isn't enough cooling for these upper climates.
George Rudawsky
Chicago, IL
75 Palm Beach
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| Re: [GMCnet] Is one 15000 BTU roof air unit enough? Or How many roof air units do you have? [message #94021 is a reply to message #93988] |
Fri, 30 July 2010 18:24 |
Luvn737s
Messages: 1106
Registered: June 2007
Karma: 2
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I live in AZ and have only one 15K BTU unit. When it's hot, I am always driving to somewhere cooler (not too difficult to find when you're in the hottest place in the country) so in motion, with pretty decent dash air, one unit works for us and the 4.5KW unit seems to do the job. Wherever we end up, the OAT is cool enough that the single air does ok.
Randy
1973 26' Painted Desert
Ahwatukee (Phoenix) AZ
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| Re: [GMCnet] Is one 15000 BTU roof air unit enough? Or How many roof air units do you have? [message #94025 is a reply to message #93988] |
Fri, 30 July 2010 19:21 |
Jim Galbavy
Messages: 1443
Registered: August 2007
Karma: 7
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Eddie,
I don't live that far from you and I have had only one 13,500 btu roof a/c for the last 6 years with out problems (Except in FL in Aug.) I just got back off the road btw. Started out from RIC for the Dixielander Rally in Dillard, Ga., then on to Orlando, Fl / Savannah, Ga / Charleston, SC / Wilmington, NC and finally back home to Chesterfield, Va this past Monday. The one roof A/C + dash a/c kept me cool with no problems. Two Roof units is nice but if I ever have to replace the current unit I'll go to the 15,000 btu. Have you had the unit checked out? Are the filters clean? Are you using 30 or 50 amp service at campgrounds. I'm wired for 50 and I think that helps.
jim galbavy
'73 X-CL (ANNIE)
Chesterfield, Va
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| Re: [GMCnet] Is one 15000 BTU roof air unit enough? Or How many roof air units do you have? [message #94044 is a reply to message #93988] |
Sat, 31 July 2010 06:53 |
jknezek
Messages: 1057
Registered: December 2007
Karma: 5
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Senior Member |
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One 15K works for us down here in AL. We reinsulated much of the coach when we did the headliner and interior. We find one can keep the coach pretty cool while parked. Driving, however, can still be pretty warm. Especially without the boost from the mostly ineffectual stock AC. Those big windows, going into the sun, on a hot day, with that motor pumping it out from below... I could see wanting 2, but only in high summer / high humidity is it really necessary in my opinion.
Thanks,
Jeremy Knezek
1976 Glenbrook
Birmingham, AL
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| Re: [GMCnet] Is one 15000 BTU roof air unit enough? Or How many roof air units do you have? [message #94056 is a reply to message #94044] |
Sat, 31 July 2010 10:44 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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| jknezek wrote on Sat, 31 July 2010 04:53 |
<snipped> ... I could see wanting 2, but only in high summer / high humidity is it really necessary in my opinion.
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Keep in mind: | Quote: |
It is easier to NOT use something you have than to USE something you do NOT have.
|
So... If you travel widely, install two.
Other things to consider:
- What size coach? (A smaller 23' coach might not need two.)
- Has there been any additional insulation added? (These coaches didn't have much from the factory.)
- What temperature(s) do you find comfortable? ... how about the other (better) half?
- Are the windows tinted?
- Do you have awnings? ... Both sides?
- How do you use your coach?
-- Hot dry areas, hot damp areas, cool areas? Do you "range widely?
-- Bonndocking, traveling and/or hooked up at an RV park?
- What size generator do you have? ... Is it reliable?
- How reliable (old) is your AC? (Do you need a back-up?)
After considering it all... It is possible that you could "need" three.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] Is one 15000 BTU roof air unit enough? Or How many roof air units do you have? [message #94063 is a reply to message #94060] |
Sat, 31 July 2010 11:17 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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Senior Member |
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| comcast wrote on Sat, 31 July 2010 08:54 |
... As for the antique thing on top, it cools but
man, does it make noise. And, yes, I could hear it loudly before my
ear transplant. It's time to replace it and I'm thinking seriously
about a split system mounted in the rear. Found a 12,000 unit with a
seer of 20 for around 800 bucks. Should be quiet as a church mouse
and blow all the way to the front of the coach. A twofur system would
probably cool a 26 easily. ...
|
Please post the details... I would like to have a "clean" roof and still be "cool."
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] split air conditioners [message #94074 is a reply to message #94066] |
Sat, 31 July 2010 12:33 |
stick miller
Messages: 1036
Registered: March 2010
Location: Americus, Georgia
Karma: 0
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Here's a newby question for you. Why couldn't you engineer something like a SUV rear air unit mounted so it wouldn't take your head off in the hallway? Maybe in a cabinet. I know space is at a premium, but this might bear consideration.
I know in our 99 Suburban the dash air will cool the front seat but to get the cabin cool, we run both front and rear air. In fact, after things cool down we run the rear higher than we do the front. She's always cold, I'm always hot.
Look at me, I won't even have my coach until tonight - being delivered from Texas - and I'm already making trouble.
Stick Miller
'78 Royale - "White Trash" - she left me for another man
'76 Eleganza - "Cousin Eddie" Sold
'84 Bluebird Wanderlodge - "Past Tents"
Americus, GA
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| Re: [GMCnet] split air conditioners [message #94090 is a reply to message #94080] |
Sat, 31 July 2010 13:22 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Stick,
Just remember: Roger's about 1/2 as long as you are. :-)
Have you heard from John? Biloxi's only about 300 miles, they should arrive
pretty early if they didn't spend all night in the casino (doubt the money
would last THAT long).
Ken H.
On Sat, Jul 31, 2010 at 1:43 PM, Roger Black <r1black@comcast.net> wrote:
> Stick, no trouble here. I do have an engine driven a/c in the rear
> but it works only while the engine is running. It's cold, too. What
> we're talking about is replacing the topside 120 vac air
> conditioner(s). If mounted on the rear wall, there's no problem with
> head space. If you need two, get a ceiling mount for the front and it
> shouldn't be sticking out any more than the air conditioner you have
> there already so far as head room.
>
> Roger Black
> 77 Birchaven
> Burns, Tn
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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