I don't think the crew cabins had A/C, but we never used them. I know they don't on the 4600, so I'd guess this is the same.
Generator is forward on the port side (if I recall correctly, I know its different on one of their models - 444 maybe). So that's really the only cabin where it is louder. Rear cabins are the quietest, as long as the engine isn't running.
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