mike4947
N. Syracuse, NY
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Joined: 08/26/2002
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What makes a large difference between 2 and 3 is the color of the coach. Those full body paint black ones really need the extra help of the third one over an all white coach.
We had one woman demand her DH paint the roof to match the body color, black of course. She said she could see the white and it made the coach look "funny". Couldn't keep that RV cool with three A/C's.
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zmotorsports
Utah
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Joined: 11/29/2007
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Color makes and how much glass you have make a huge difference in how much heat needs to be pulled out of the interior.
Our last coach was a 1991 38' Beaver Contessa which had two A/C units. If you could turn them on early in the day before it got too hot two were sufficient. However, if you came back after a long day of playing or when we went to the desert to play in the sand in the warmer months, I wish I would have had three.
When we were looking for our current coach, 3 air conditioning units as well as the 10kw generator were on our wants list. It is hard to find three on a 40' rig. Above 40' three units is pretty common but 40' and less usually only two unless the original owner special orders a third which was the case on ours.
Mike.
2003 Monaco Dynasty/ 26' Haulmark Edge trailer
2011 Jeep Unlimited Rubicon
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RSchleder
iowa city, ia
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Joined: 09/04/2011
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I agree, get 3 and use the number you need to stay cool. If you only have 2 and can't get the coach cooled down, you'll quickly want to kick yourself!
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Rich D.
New England
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Joined: 03/10/2003
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Don't forget to add for slides. Two air conditioners in a 34' coach with no slides means about 144 sf per unit. A 41' coach with 4 slides equals about 220 sf per unit. As others have stated - go for the 3 A/C's.
Rich D. Wanderlodge M450 LXi
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SRT
Head of the Lakes, MN
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Joined: 02/18/2001
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Gee, when we bought ours new, there was an option for two A/c's, 50amp and 5.5 Onan generator. Plus our roof is white. Sure needed two A/c's this past summer in July when we had hot temperatures (equal to 110+°). Kept the cats cool while we were at a convention.
SRT
2000 32' HR Vacationer with Banks
1998 Subaru Outback Ltd. 5 spd
Brake Buddy & Blue Ox Aventa II tow bar
FMCA #266040 HRRVC #84109
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JTHarley
Northeast, Michigan, USA
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Joined: 02/27/2003
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Three is better than two even though most 50 amp units will only run 2 at a time. I like the idea of having a back up and being able to turn the air in zone 1 off and turn on zone 3 in the bedroom when you go to bed.
Jim , MJ & Spirit of Sambuca Bear
"He's one big Newfie"
Dynamax Ultra 450UL
450 MBE
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CA Traveler
The Western States
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Joined: 01/03/2004
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JTHarley wrote:Three is better than two even though most 50 amp units will only run 2 at a time. A 50A rig should easily be able to run 3 ACs and a lot of other equipment all at the same time. 12,000 watts is a lot of power.
2009 Holiday Rambler 42 Scepter with ISL 400 Cummins
2004 Honda CR-V
Bob
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Mr.Mark
California/Tennessee
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Joined: 09/24/2006
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JTHarley wrote:Three is better than two even though most 50 amp units will only run 2 at a time. I like the idea of having a back up and being able to turn the air in zone 1 off and turn on zone 3 in the bedroom when you go to bed.
We have run 3 air units at the same time many times. What I can't do is run the third air and the dryer at the same time or the electric cooktop and the third air. Otherwise, we plan accordingly and do laundry at the end of the day when the third air is not needed.
We have only used our cooktop once in almost 5 yrs.; we use the the grill outside and/or the convection microwave.
MM.
Mr.Mark 
2008 Monaco Dynasty, 42.2 ft., 4 slides, 425 hp clean-air Cummins diesel
2013 Honda CR-V EXL, AWD, w/Nav, SMI Air Force One vacuum-assisted braking
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B's Bunch
Shelbyville, TN. USA Why live any where else?
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Joined: 10/31/2003
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univmd wrote:We need all 3, esp. whenever we visit TN. what are you trying to say
Larry,Brenda,Travis,Jarred & MEME the Boston Terror TheBunch 2011 American Coach Revolution 42T
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JTHarley
Northeast, Michigan, USA
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Joined: 02/27/2003
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Mr.Mark wrote:JTHarley wrote:Three is better than two even though most 50 amp units will only run 2 at a time. I like the idea of having a back up and being able to turn the air in zone 1 off and turn on zone 3 in the bedroom when you go to bed.
We have run 3 air units at the same time many times. What I can't do is run the third air and the dryer at the same time or the electric cooktop and the third air. Otherwise, we plan accordingly and do laundry at the end of the day when the third air is not needed.
We have only used our cooktop once in almost 5 yrs.; we use the the grill outside and/or the convection microwave.
MM.
OOPs my bad...I can run 3 AC units but only two heat zones at the same time.....
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