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I can tell you that our 11k btu unit will freeze us out of our 25', but it's not an Airstream... especially not a '72 Airstream. The Armstrong unit I had on my '70 Safari 23' would freeze me out. The 13.5k unit I had on my 34' blew cold but couldn't begin to keep up on a hot day in the full sun. I had to run BOTH 13.5k units on our '85 325 moho just to keep some semblance of not being an oven on a hot day in the sun.
Yours should blow cold air, but whether or not it'll keep up with the heat in your trailer will depend on many factors. If you're concerned about its operation, I'd suggest you take it to a dealer and have it evaluated. IIRC, it's designed to cool 15 or 20* below ambient air temp or something like that.
Roger
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AIR 2053 “A generation which ignores history has no past and no future.” Robert Heinlein
1994 Airstream B190 & 2006 Bigfoot 25B25RQ
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