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Old 04-04-2016, 06:24 PM   #15
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After experiencing 98-100F temperatures last summer in WA in our SOB Class B, we opted for dual AC units in our '16 27' FC. I am glad we did.
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Old 04-04-2016, 06:26 PM   #16
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Two. You can always just run one if you don't need both; definitely run the bedroom one at night rather than both. That beats the heck out of not having enough AC when you need it.
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Old 04-04-2016, 07:03 PM   #17
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Originally Posted by KEIZER View Post
A lot of variables there. BTU of unit, trailer layout, and are they utilizing factory insulation. I am removing my roof top unit and installing a concealed unit. Less wind drag and will look better.

Can you share more about the specifics of this? Thanks.
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Old 04-04-2016, 08:22 PM   #18
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We were looking at a 2016 28' Flying Cloud with twin beds. The salesman said in hot weather we could regulate the vents to force more AC in the area we desired. With the advice given here we have decided to find one with 2 AC units. Thanks for all the responses.
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Old 04-04-2016, 09:53 PM   #19
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Although I'm late to this message and the 80Ram has decided on two A/C units, I'll be the oddball and say I'm very happy with only 1 A/C. We have had our 28 International almost three years and we have only run the A/C 2 or 3 times. We use it about 3 months or more a year, about half the time we are dry camping. Since the trailers is sitting on wheels, we don't go to hot climates where A/C is needed very much. I really enjoy having the Fantastic fan in the bedroom which we would give up with the 2nd A/C. We also have never had an issue with 30amp service since again we chose to have the propane oven, not a microwave.

The best part of the A/C for us is using the heat pump some of the time when we have an electric site.

If we lived in a hot area and were using the trailer in the summer, I'm sure I would feel very different. Either way, I strongly recommend the full awnings for the 28. The port side awning is great for lessening the load on the fridge and just making the trailer more comfortable.
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Old 04-05-2016, 05:52 AM   #20
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Since the physical size of the 13.5K BTU air conditioner is the same as the 15K BTU air conditioner and the power requirements are pretty much the same, one could swap out the lower capacity rear unit and have both units the same.

We will see if the stock 13.5 K BTU air conditioner is adequate this summer on the 23D and could always upgrade to the 15K BTU air conditioner.
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Old 04-05-2016, 09:46 AM   #21
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The cost difference between 2 a/c units and 1 a/c unit can't be much on an $80,000+ trailer anyway.
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Old 04-05-2016, 11:42 AM   #22
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Since the physical size of the 13.5K BTU air conditioner is the same as the 15K BTU air conditioner and the power requirements are pretty much the same, one could swap out the lower capacity rear unit and have both units the same.

We will see if the stock 13.5 K BTU air conditioner is adequate this summer on the 23D and could always upgrade to the 15K BTU air conditioner.
In an average home, one ton of AC (12,000 btu) is good for 600 square feet or about 4800 cubic feet.

However an Airstream trailer is not insulated as well as a home.

A 30 foot Airstream has about 1200 cubic feet.

But since the insulation is far less than a home, many more btu's is required to cool the trailer down to the typical home temperature of 76 degees.

The compass heading when parking an Airstream, is very important when the AC will be used. Parking it heading east or west will expose the least amount of the trailer to the sun, at any given moment.

Keeping a good comfortable temperature also depends on when the AC is turned on. Cooling the trailer, before the interior temperature rises above the comfort temperature, is very important. In that way, the AC has some what of a lessor cooling job to do, in that you gave it a HEAD START.

A 13,500 AC is about 1 1/8 ton. A 15,000 btu unit is about 1 1/4 ton. Picking up that other 1/8 ton (1500 btu) sometimes is just enough to get the job done. However, on a very hot day, say above 90 to 95 degrees, additional cooling becomes almost a necessity.

Having 2 13,500 btu AC's or 2 15,000 btu AC's will absolutely do the job.

But, power requirements then becomes a big issue. Ball park, each AC unit will consume about 15 to 18 amps (1800 to 2100 watts) when running at a cooler inside temperature. The higher the interior temperature, the greater the wattage consumed. Unfortunately, the trailer has a limit of 3600 watts.

The very best way to then have 2 AC's that will run OK, is have the original unit "as is". Then, have the second unit wired so that it in "no way" is a part of the trailer power consumption. Simply have it wired totally by itself. In that way, at most camp grounds, you simply plug in the second power cable to a second outlet. Most campgrounds today have more than one outlet serving each parking space.

In that way, you still can enjoy all the other electrical things in the trailer, without blowing a circuit breaker.

Andy
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Old 04-05-2016, 12:10 PM   #23
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buy the two if you need it you have it if you don't just run one air, last summer we were north Carolina and it was hotter than the blue blazes and the 2 ac's ran most of the time

just my 2 cents

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Old 04-05-2016, 12:12 PM   #24
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Always better to have it and not need it than to need it and not have it-
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Old 04-05-2016, 02:46 PM   #25
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I have a 34 foot airstream excella with a 15,000 BTU Coleman air-conditioning unit at 108° in Georgetown Texas it work just fine with my small awnings out in a semi-shaded spot. It might not have worked as well if I had a bunch of guest going in and out the door all the time but we were comfortable with that one unit. Your use and number of people you carry with you may affect your decision. Many of the campgrounds I use are 30 amp harder run 2 the air-conditioners on that.
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Old 04-09-2016, 07:52 AM   #26
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In the new Airstreams with ducted air, I assume both air conditioners share the same duct system. Therefore, unlike the non ducted system with one air conditioner, you get air distributed throughout the trailer. l wonder if most proponents of two air conditioners are experienced with the older non ducted systems and the real advantage then, was getting better air distribution by having air coming out of the two units in the front and rear of the trailer. Seems like with one 15,000 BTU unit blowing into a ducted system, distributing the air throughout the trailer, it would be adequate except in the most extreme conditions, which would be rare. Plus, with one unit, you get the advantage of less initial cost, lighter 30 amp cord, and the additional front 30 amp connector for a generator.
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Old 04-10-2016, 09:07 AM   #27
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Heat load is heat load. Cooling necessary for a 31' Airstream in the Southwest requires more than a single unit on a hot day wen parked in the sun.

So perhaps the location of the trailer during the summer is more of a determining factor for one versus two units. If the unit spends the summer in northern Michigan where the hot days can be int he low 80s, then perhaps one is adequate.

Resale down the road will be better wth two units in the southern tier of states. The extra $2,129 (in 2014) was not that much more when spending nearly $100,000 on a new unit.
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Old 04-10-2016, 09:20 AM   #28
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^^^ This.

I am SO glad we got two ACs. Heck, we had them both running here in Fort Stockton yesterday, and it was only 82.
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