The Whisper Quiet AC is a joke. Mine sounds like a freight train going across the roof. The dealer looked at it and found no problem, then we had a HVAC guy take a look. He agreed that it was quite loud, but could not find an issue with it. It also does not work efficiently, we can manage a difference of 5 degrees between inside and outside temps, the HVAC guy said that it's a bad design. Our neighbors have the Whisper Quiet AC in theirs...SOB...and it is just a gentle whirring, can barely hear anything. Theirs is also ducted differently, and works very efficiently, no problem keeping temps in the 60's on the hottest days of late. Disappointed with ours.