The air-con in the rear is directly under the bed, so you'll hear some compressor noise. It doesn't have a very long run time on batteries, maybe 4 hours with no sun.
Its best used by running it as you drive to the campsite to cool the house, then run it until the sun goes down.
OR - plug in to shore power or generator for running all night.
My wife says "its on wheels, just drive to where its cooler"