First off
The old style contractor generator with the itty bitty exhaust and chain saw noise, is no longer being sold new in the retail market
Even getting hard to find on the use market, nobody wants them
Even the classic open frame generator being produced and sold harbour freight, champion, B&S etc.. Have a big enough exhaust to keep it down to legal limited on the noise
Inverter generator are just even more quiet
But an inverter generator powering an A/C unit is not super quiet
Super quiet is when it's powering the battery charger or converter and the batteries are taking very low amps, so honda etc.. Is idling in Economy mode