Scotty, below is a reply I got from Bill Reber, on another thread, he has A/C in his Aspen camper.
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The AC is a $99.00 5,000 BTU 115 volts AC . Unit is a cheap window unit from Lowles but it is what Aspen recomends. Yes a small generator can be used for power , however we just pluged into the camps power. The unit sits on a small milk crate and is tied into the camper by a draw cord. If you go to the Aspen site you will see how this unit is set up. Other builders differ slightly but for the most part they are all about the same with the exception of Lee Ur Lite.For heat we use a small box heater again 5,000 BTU , just be very carefull using any heater, the one we use has a auto shut of if tipped.
Bill
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Hopefully someone that has a generator can give us info about that.