Home » Public Forums » GMCnet » [GMCnet] Air conditioner sizing
| [GMCnet] Air conditioner sizing [message #199724] |
Sun, 24 February 2013 21:11  |
mjbourgon
Messages: 259
Registered: May 2010
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Ok you guys. My Glenbrook has only one a/c on the front. I would like
to add one in the back and was wondering what is the correct size for
the second a/c/unit. Not dimension but btu size. I does get hot in
this area during the summer.
Thanks guys.
Marcel in a cold new mexico.
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| Re: [GMCnet] Air conditioner sizing [message #199762 is a reply to message #199760] |
Mon, 25 February 2013 06:52  |
Emery Stora
Messages: 959
Registered: January 2011
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Marcel, my last message had a typo. I said 18,000 btu. I meant to type 15,000 btu. I would also suggest you get the high efficiency unit. I had replaced my original single air conditioner with a Duotherm Briskair high efficiency 15,000 unit and we have been comfortable in the 115 to 120 degree temps of the Southwest with a single unit. However I had totally insulated the walls and ceiling with urethane foam years ago and we have awnings on both sides. If I had not done the insulation upgrade I would probably need two air conditioners.
Emery Stora
On Feb 25, 2013, at 5:41 AM, Larry <weidnerl@wwt.net> wrote:
>
>
> mjbourgon wrote on Sun, 24 February 2013 21:11
>> Ok you guys. My Glenbrook has only one a/c on the front. I would like
>> to add one in the back and was wondering what is the correct size for
>> the second a/c/unit. Not dimension but btu size. I does get hot in
>> this area during the summer.
>> Thanks guys.
>> Marcel in a cold new mexico.
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> Before you buy that second AC, you might want to check the hole that it will go in to make sure that there is 120v power there. There should be a 10ga wire there somewhere. If not, you've got to find a way to pull one from your main panel to the opening. Just a suggestion is all...
> --
> Larry :)
> 78 Royale w/500 Caddy
> Menomonie, WI.
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| Re: [GMCnet] Air conditioner sizing [message #199768 is a reply to message #199762] |
Mon, 25 February 2013 07:21 |
mjbourgon
Messages: 259
Registered: May 2010
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Emory
Thanks as always for good ideas. This is my second coach. My other is
a stretched palm beach and the two units really make the southwest
bearable in the warm months. This one is a old glenbrook that needed a
major make over
Marcel
On 2/25/2013 05:52, Emery Stora wrote:
> Marcel, my last message had a typo. I said 18,000 btu. I meant to type 15,000 btu. I would also suggest you get the high efficiency unit. I had replaced my original single air conditioner with a Duotherm Briskair high efficiency 15,000 unit and we have been comfortable in the 115 to 120 degree temps of the Southwest with a single unit. However I had totally insulated the walls and ceiling with urethane foam years ago and we have awnings on both sides. If I had not done the insulation upgrade I would probably need two air conditioners.
>
> Emery Stora
>
> On Feb 25, 2013, at 5:41 AM, Larry <weidnerl@wwt.net> wrote:
>
>>
>> mjbourgon wrote on Sun, 24 February 2013 21:11
>>> Ok you guys. My Glenbrook has only one a/c on the front. I would like
>>> to add one in the back and was wondering what is the correct size for
>>> the second a/c/unit. Not dimension but btu size. I does get hot in
>>> this area during the summer.
>>> Thanks guys.
>>> Marcel in a cold new mexico.
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>> Before you buy that second AC, you might want to check the hole that it will go in to make sure that there is 120v power there. There should be a 10ga wire there somewhere. If not, you've got to find a way to pull one from your main panel to the opening. Just a suggestion is all...
>> --
>> Larry :)
>> 78 Royale w/500 Caddy
>> Menomonie, WI.
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
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| Re: [GMCnet] Air conditioner sizing [message #199771 is a reply to message #199762] |
Mon, 25 February 2013 07:50 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Emery,
You reminded me that the two 13,500 BTU units I bought are Duotherm Briskair high efficiency.
If you remember when you helped me fix the Onan it ran both of them, the water heater, converter, and microwave all at the same time
so they MUST be high efficiency units.
They ain't too pretty as they are tall.
Regards,
Rob M.
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Emery Stora
Sent: Monday, February 25, 2013 11:52 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Air conditioner sizing
Marcel, my last message had a typo. I said 18,000 btu. I meant to type 15,000 btu. I would also suggest you get the high efficiency
unit. I had replaced my original single air conditioner with a Duotherm Briskair high efficiency 15,000 unit and we have been
comfortable in the 115 to 120 degree temps of the Southwest with a single unit. However I had totally insulated the walls and
ceiling with urethane foam years ago and we have awnings on both sides. If I had not done the insulation upgrade I would probably
need two air conditioners.
Emery Stora
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Air conditioner sizing [message #199773 is a reply to message #199724] |
Mon, 25 February 2013 08:14 |
robertmcw
Messages: 71
Registered: April 2011
Karma: 0
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Member |
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Most of you know I am looking for a GMC. Just a little history – the county is going to take some frontage land I have for an overpass where I live. I understand I should get a check in about 3 -4 months and part of that check will go for a coach.
Now, I live in the Houston area and in the summers it really gets hot with the sun and the humidity it gets really bad. About in 1999, in Houston the temperates would go up in the 105 – 108 area and drop to 99 degrees at 10 pm and go up back in 105 – 108 next morning. So, I can see needing two units for the day but after the sun goes down, I can see one.
And if you really need two units, would need the 13,500 btu units or bigger? What if you get the bigger one in the cab area and a smaller one for the back, even from a 11,000 btu instead of a 13,500 btu unit in the back?
Am I thinking right?
Robert
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| Re: [GMCnet] Air conditioner sizing [message #199777 is a reply to message #199773] |
Mon, 25 February 2013 08:59 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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When my travel trailer A/C got hit by a hail storm and tornado,
the cost to upgrade from a 13.5 to 15.0 thousand BTU was only
an added $50 or so.
You can always set thermostat to desired temp and if the unit
runs less, so what? Would you rather have too much capability
or too little?
If/when the original A/C units on my coach crater, I'll replace
with the most capable unit(s) that will fit.
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
~ ~ ~ '76 ex-Palm Beach ~ ~ ~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
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> To: gmclist@temp.gmcnet.org
> From: txlawyer@texas.net
> Date: Mon, 25 Feb 2013 08:14:05 -0600
> Subject: Re: [GMCnet] Air conditioner sizing
>
> Most of you know I am looking for a GMC. Just a little history – the county is going to take some frontage land I have for an overpass where I live. I understand I should get a check in about 3 -4 months and part of that check will go for a coach.
>
> Now, I live in the Houston area and in the summers it really gets hot with the sun and the humidity it gets really bad. About in 1999, in Houston the temperates would go up in the 105 – 108 area and drop to 99 degrees at 10 pm and go up back in 105 – 108 next morning. So, I can see needing two units for the day but after the sun goes down, I can see one.
>
> And if you really need two units, would need the 13,500 btu units or bigger? What if you get the bigger one in the cab area and a smaller one for the back, even from a 11,000 btu instead of a 13,500 btu unit in the back?
>
> Am I thinking right?
>
> Robert
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| Re: [GMCnet] Air conditioner sizing [message #199778 is a reply to message #199724] |
Mon, 25 February 2013 09:21 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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in my non expert opinion.
it is a "big picture" question.
I struggle to keep my GMC cool. Long list of things I plan on implementing to help that out. I currently have two original working A/C Units.
what you need for A/C depends on who you are(how cold do you like it). how and where and when you want to use your coach.
and how much insulation, what windows, what kind of window shades, awnings, windshield covers. the list is long.
I would also believe that even some floor plans cool better then others.
so if you do not have good insulation, awnings, window coverings. You are going to want a bigger A/C unit.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: [GMCnet] Air conditioner sizing [message #199898 is a reply to message #199773] |
Tue, 26 February 2013 06:12 |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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Buy the largest one. You can always turn the temp down and the cost of the
extra BTUs is very small compared to not having enough cooling. We run the
rear one when we want to watch TV in the front, and vice versa for sleeping
when it's hot.
On Mon, Feb 25, 2013 at 7:14 AM, Robert McWhorter <txlawyer@texas.net>wrote:
>
>
> Most of you know I am looking for a GMC. Just a little history –
> the county is going to take some frontage land I have for an overpass where
> I live. I understand I should get a check in about 3 -4 months and part of
> that check will go for a coach.
>
> Now, I live in the Houston area and in the summers it really gets hot with
> the sun and the humidity it gets really bad. About in 1999, in Houston the
> temperates would go up in the 105 – 108 area and drop to 99 degrees
> at 10 pm and go up back in 105 – 108 next morning. So, I can see
> needing two units for the day but after the sun goes down, I can see one.
>
> And if you really need two units, would need the 13,500 btu units or
> bigger? What if you get the bigger one in the cab area and a smaller one
> for the back, even from a 11,000 btu instead of a 13,500 btu unit in the
> back?
>
> Am I thinking right?
>
> Robert
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Take care,
Steve
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