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Old 03-09-2015, 07:45 PM   #15
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For us in Mississippi it is not one or two trips in the heat and humidity- it is 20-25 trips in the heat and humidity-
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Old 07-08-2017, 02:54 PM   #16
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I know this is an old thread. Hoping for some input on the same question though.

We're looking at a 2017 International Signature 28'. It only has one a/c.. We're assuming we can get a great deal on it, since it's a 2017, but we are questioning having only one a/c.

The salesman said he thinks we can add another smaller a/c unit, and still be under 30 amps. He thinks it can be added in place of one of the ceiling fans.

Anyone ever done this?

Not sure if we even want to do it, but would be nice to know that we have the option.

We avoid intentionally going places that are super hot and humid, however, sometimes it just happens!
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Old 07-08-2017, 02:57 PM   #17
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Just found this short discussion...

http://www.airforums.com/forums/f37/...er-153143.html
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Old 07-08-2017, 03:04 PM   #18
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Quote:
Originally Posted by weirdstuff View Post
I know this is an old thread. Hoping for some input on the same question though.

We're looking at a 2017 International Signature 28'. It only has one a/c.. We're assuming we can get a great deal on it, since it's a 2017, but we are questioning having only one a/c.

The salesman said he thinks we can add another smaller a/c unit, and still be under 30 amps. He thinks it can be added in place of one of the ceiling fans.

Anyone ever done this?

Not sure if we even want to do it, but would be nice to know that we have the option.

We avoid intentionally going places that are super hot and humid, however, sometimes it just happens!
Hi

You can add another AC one way or another. You can hook up to 30A service. Running both AC's on 30A? Not so much with normal AC units. Running both AC's (even tricked out) on 30A and a reasonable number of other things .... forget it.

The "two AC" trailers come with 50A plugs on them. The 30A setup is 30A at 110V. The 50A service is 220V split phase so you can use it as *two* 50A 110V circuits. Simply put, they bump up to almost 4X the power when they go to dual AC units.

Easy answer is to upgrade the power to a 50A feed when you do the AC add on. They will be pulling this and that and snaking wires in here and there anyway.

Bob
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Old 07-08-2017, 03:13 PM   #19
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We have a 31' Classic Motorhome 310TD. I'm awfully glad we have two 13500 units. Camped in Colorado right now, weeks of 90 plus temps, one unit would not keep up. FWIW
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Old 07-08-2017, 03:39 PM   #20
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Hi

30' out in the sun / no shade / no awnings in the mid to high 90's, the 15,000 really will not keep up.(There is a video showing a demo trailer above 100F in the exact same conditions). Same temps, in the shade, the 13,500 + 15,000 combo is loafing when keeping things in the mid 70's. Shade (even from the awnings) can make a big difference. So can your expectations of how cool it should be. Once the sun went down, the 15,000 had no problem getting the trailer to the 70's quite quickly.

Bob
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Old 07-09-2017, 10:06 AM   #21
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When the two A/C and 50 amp service option is selected, the smaller (13.5K BTU) unit is typically installed in the rear ceiling vent fan location in place of the fan. This option is frankly a huge profit item for the Airstream option list given the bill of materials at the time of the build out.

That was a $2,129 dollar option for our Classic in 2014.
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Old 07-09-2017, 10:48 AM   #22
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2015 30 foot.. One or Two Air Conditioners?

When the largest AC units available at one time were 13.5k units, folks from 27' up really struggled in full sun hot conditions to keep indoor temps comfortable. When my 30' Classic was built, 13.5k was the standard but 15k units were options. I asked for the 15k heat pump AC Penguin at build time which was a $700 option, and have no regrets with only one unit. Quite honestly if I traveled in the Deep South or southwest I might have considered a rear unit. I've been out in the 90's here in the Midwest and have frond that the 15k unit works well in my 30' slide out.

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Old 07-09-2017, 11:05 AM   #23
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We never seem to need to use the rear heat pump. I'd question the salesman hard on getting by with 30 amp service with two a/c units? We obviously have 50 amp capability but use a 30 amp cord that comes with a male connector that fits the coach input.
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Old 07-09-2017, 11:20 AM   #24
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Hi

Consider that humidity counts a *lot* in terms of how hard an AC needs to work. At 90% RH and 90F it is doing a lot of work. Depending on this and that, it likely will be easier to cool from 120F at 10% RH.

Bob
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