I have noisy window AC units. I prefer to turn them off at night but I’ve had to keep them on all night. I turn them off in the morning and air the house out before closing it up again. I don’t run all 3 at the same time but alternate the bedroom and living room units to cut down on the cost of the extra electricity.You JUST turned on the ac? LOL, mines been on full time for weeks, probably more like months.![]()