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Old 05-11-2011, 04:23 PM   #15
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30 Foot 2011 Classic, two A/C units, 13,500 in bedroom & 15,000 in front above galley.


John "JFScheck" Scheck
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Old 05-13-2011, 03:16 PM   #16
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Well, I am glad I decided to do a little research and not take the (very nice, well-meaning) repair man's word for it. He wanted to put in a 13500 but I didn't think that would work. It will probably be at least 90 the majority of the summer... Thanks everybody for contributing!

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Old 05-13-2011, 05:30 PM   #17
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If Airstream would entertain (big if) an upgrade to a 15k unit on a new Interstate, would the on-board Onan generator start a 15k? Is there much difference in starting a 13.5 versus a 15k? I was told by a dealer that the 13.5 unit is ac only (not a heat pump). I am not sure if that makes any difference. It gets hot in Texas.

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Old 05-14-2011, 07:10 AM   #18
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The 13,500 BTU unit in ours has a heat pump. It's possible that in the newer ones they didn't include that option.

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Old 05-14-2011, 09:56 AM   #19
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I am talking about a 2011 Airstream Interstate class B which comes with a 13.5 a/c unit without a heat pump. Sorry I didn't make that very clear. The Interstate is so expensive but most everything is included and of a higher quality than the usual Airstream choices.

Is there a downside to having a 13,500 BTU heat pump? Possibly a larger startup draw which the on-board Onan generator couldn't handle or is this the usual Airstream decision which defies logic?

The same questions come up regarding the 15,000 BTU heat pump. Lew said the wiring is ok to go to a 15K from a 13.5K. So why doesn't Airstream always offer an upgrade to a 15,000 BTU unit? I doubt that the Interstate is any better insulated than the Airstream trailer line.

I may be wrong but I would like to hear from anyone that has an Interstate that is comfy with a 13.5K unit sitting in full sun on a typical 102 degree day in Texas.

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Old 05-14-2011, 10:51 AM   #20
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You can check page 3 for some specs on Dometic Penguin.

I don't know how much spare capacity the built in generator on the Interstate has. The capacity varies due to temp and elevation.

The 13.6 vs. 15K btu are within about 10% of each other. They are not night and day different.

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