Air Conditioner Noise Level
We have a Mach 15 and yes, it is loud. The noise is definitely from air flow and not motor or condenser related. That thing moves a ton of air! I agree that closing the Chill Grill vents and forcing the air out through the ducts is the best way to quiet it down. In our trailer there are ducts in the main living area as well that can provide cool air there in lieu of the vents in the grill. I'll have to try closing all the grill vents and see if things still stay cool enough.
2012 JayFlight 32TSBH (Elite, Thermal, Tech Packages, Power Awning)
2009 Ford F-150 SuperCrew Platinum 5.4L V8/3.73 Limited Slip, 6.5' Bed, Max Tow, and Integrated Brake Controller