Quoted: At the end of the season you can buy small window units for $75 on sale most anywhere. One unit I have four of in our computer room weighs 35 pounds and uses 475 Watts with about a 1,200 Watt surge when you turn it on. It would be very easy to run it off of an inverter or generator. $75 is much better than the $1k plus I've spent on several of our US-made cars and trucks that still don't have good working air. I've thought seriously of putting a small window unit on some of our vehicles.z
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Most OEM air conditioners are at least 15,000 BTU/H, so a 5,000 BTU window unit would probably be a tad small. The 10K model shown works fine after it gets up a full head of steam, but takes several minutes longer to cool down than factory air. Power consumption is almost exactly 1KW, which would be slightly beyond the capability of the 12 volt alternator found in most vehicles. The 4KW generator doesn't even know the window unit is there, except during startup.
Over the past 3 years, reliability has turned out to be another unexpected advantage. The window unit still works like new. The generator snapped a rocker arm stud unexpectedly last Spring, but has been otherwise completely reliable (250+ hours). I doubt you could spend the same money on an automotive AC repair job and expect it to last more than a couple of years.
The deciding factor in doing it was the fact that the generator can also be used for other chores, and is plumbed into 16 gallons of always-fresh gasoline - Provides plenty of run-time in an emergency.