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Old 01-02-2015, 07:28 PM   #1
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Adequacy of AC on Newmar Luxury Coaches

Most all 45' Prevost Converters and Newells install 4 each 15M btu rooftop AC units (excluding cruiseaire and OTR AC installed by some converters). Newmar (and most other plastic coaches) only install 3 each 15M btu rooftop units on their largest 45' coaches. My questions to Newmar Owners who have a 45' long King Aire, Essex, London and Mountain with 3 each 15M btu rooftop units are:

1) Have you ever been in hot weather ( over 105 degrees) wherein the three 15M units were not adequate to maintain a low 70 degree temperature inside?
2) And when in the same hot weather with the AC units shut off and the interior coach temperature approached the exterior temperature, how long would it take the 3 AC units to cool down the coach to low 70's?

The reason I ask about the performance is if they are not adequate in the hottest temperatures then maybe i should consider ordering a 4th AC unit (providing Newmar would accommodate this special request).
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Old 01-02-2015, 07:41 PM   #2
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Quote:
Originally Posted by BucketList View Post
Most all 45' Prevost Converters and Newells install 4 each 15M btu rooftop AC units (excluding cruiseaire and OTR AC installed by some converters). Newmar (and most other plastic coaches) only install 3 each 15M btu rooftop units on their largest 45' coaches. My questions to Newmar Owners who have a 45' long King Aire, Essex, London and Mountain with 3 each 15M btu rooftop units are:

1) Have you ever been in hot weather ( over 105 degrees) wherein the three 15M units were not adequate to maintain a low 70 degree temperature inside?
2) And when in the same hot weather with the AC units shut off and the interior coach temperature approached the exterior temperature, how long would it take the 3 AC units to cool down the coach to low 70's?

The reason I ask about the performance is if they are not adequate in the hottest temperatures then maybe i should consider ordering a 4th AC unit (providing Newmar would accommodate this special request).
......................
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Old 01-02-2015, 07:47 PM   #3
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Never have seen a fourth put in because they probably do not need it with the well insulated coach for summer temp's or for cold weather camping to retain the heat in winter.

TOTAL COMFORT --------- NEWMAR CONSTRUCTION

AC DUCT CONSTRUCTION
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Old 01-02-2015, 07:59 PM   #4
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Some of the 45' Prevost's have 5.
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Old 01-02-2015, 08:01 PM   #5
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Must not be insulated very well.
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Old 01-02-2015, 08:06 PM   #6
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My coach is not a Newmar but it is 45' with 3 A/Cs. It has been nice and cool in the hottest weather I have encountered, which is in the mid to upper 90's (Fahrenheit). If you intend to use it in Phoenix in the summer, where temps can go up to 115 or more, you may need a fourth unit, but in sub-100 temps I believe three units does a fine job.
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Old 01-02-2015, 08:15 PM   #7
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Quote:
Originally Posted by 96 Wideglide View Post
Some of the 45' Prevost's have 5.
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Must not be insulated very well.
Or black.........
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Old 01-02-2015, 08:26 PM   #8
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Run them all together, there goes your 50A service !
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Old 01-02-2015, 08:56 PM   #9
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Run them all together, there goes your 50A service !

How so? 50 amp service is 2 x 50 for 100 amps total.


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Old 01-02-2015, 09:06 PM   #10
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My 15,000btu unit's draw about 17A each. Multiply that X5.
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Old 01-02-2015, 09:17 PM   #11
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That's 85 amps. Not much head room but possible. I'm sure a coach with 4-5 roof airs would have a management system to stagger the compressor runs. I don't run with a crowd with so many roof airs. I've never heard anyone Complain that 3 rood a/c units weren't adequate.


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Old 01-02-2015, 09:29 PM   #12
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I've never had my 3 on at the same time, but I also have'nt been anywhere hot in it ..... YET .
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Old 01-02-2015, 09:33 PM   #13
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I've never had my 3 on at the same time, but I also have'nt been anywhere hot in it ..... YET .

I agree. I've rarely turned my 3 on at once and I've been in 95-100 many times.


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Old 01-02-2015, 09:57 PM   #14
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Quote:
Originally Posted by BucketList View Post
Most all 45' Prevost Converters and Newells install 4 each 15M btu rooftop AC units (excluding cruiseaire and OTR AC installed by some converters). Newmar (and most other plastic coaches) only install 3 each 15M btu rooftop units on their largest 45' coaches. My questions to Newmar Owners who have a 45' long King Aire, Essex, London and Mountain with 3 each 15M btu rooftop units are:

1) Have you ever been in hot weather ( over 105 degrees) wherein the three 15M units were not adequate to maintain a low 70 degree temperature inside?
2) And when in the same hot weather with the AC units shut off and the interior coach temperature approached the exterior temperature, how long would it take the 3 AC units to cool down the coach to low 70's?

The reason I ask about the performance is if they are not adequate in the hottest temperatures then maybe i should consider ordering a 4th AC unit (providing Newmar would accommodate this special request).
Hi BucketList,

We've had our King Aires' at Lake Havasu, Lake Powell, and Las Vegas in Summer, The A/C's run a lot, but the coach stays cool. The Prevost conversions with 4 A/C's or the Road Air are probably cooler as they are cooling less square feet than an Essex or King Aire. We're happy in hot weather and the temperature is not on our minds in our coach. Not to mention that we can actually run the Mid A/C from our 16 battery bank going down the road with our second invertor, Nice option!! It's Newmars answer to the NASCAR folks who can rarely plug in.
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