Air conditioner very loud. Mine was put together wrong.
The air conditioner in my Rockwood 2306 was loud. We thought that it was because we had a larger unit put in. It is a Coleman Mach. We just cranked up the TV sound when the air came on. After one season of this I decided to do what I can to sound proof it. I have a background in sound engineering and by God I was going to do something about this. I took off the intake cover (the cover over the air filter) to listen to it while it was running. It was quite loud in there and when I put my hand into the opening a little it was blasted with a stream of air. What? Where is this air coming from, this is the intake and I should only feel at best a very slight draw of air up into the opening. The air was coming from the output side going under what should have been a wall divider between the intake and output. The wall barrier should come down and meet up with a slight extrusion in the cover to the unit. In essence the output should not be blowing anywhere except the ducts and if open the quick cool vents. I could see a large gap at the bottom of the barrier wall and it was about a half an inch. The air was just whistling through that gap.
I removed the inside cover to the unit and after just a little look around found that the barrier wall between the intake and output was mounted backwards. Took out the 4 screws holding it in place an rotated 180 degrees. There were actually screw holes where it should have been! Once turned around the bottom of the divider wall got moved over about half and inch and now matched up with the part in the cover and made an air tight seal. No air was rushing under that divider anymore. Much, much quieter.
If you have noisy air you might want to remove the cover to the intake and run the fan and see if you feel air rushing under the divider wall.