I would like to make a change to my AC units so they are not so noisey. I have heard that the noise comes from obstructions in the air flow. I have also heard of people redoing the ceiling vents so ...
Here is the feedback I received from another forum:
we recently had the plastic inside air conditioner vents (covers) replaced with a decorative, upholstered cover. they sealed (taped) off the air outflow portion with an A/C vent material that looked like a metallic piece of cardboard. that out flow air is now forced through the various round A/C vents throughout the cabin. This significantly reduced the noise level inside the RV.