This topic isn't really maintenance but here goes:

I have a Lunair (16k I believe) that's original to my boat at about 22 years. It works great but it's noisey. One of the biggest sources of noise is through the intake vent which is right in the main berth. There's no filter so I'm looking right at the condensor through the grate. The spacing between the slats is also pretty big.

I can easily add some type of filter but can't imagine that would help much. Are there any particular filters that DO cut down the noise level? And/or, can I make the intake a little smaller? It's at least 18"x 18" sqaure off the top of my head.

My other thought was to line the inside of the two walls that surround the unit with dynamat or something similar.

The other thing I was thinking was some sort of "soft start" modification which I understand is used for running on a generator. Does that also help with the noise level? Aside from the constant noise described above, the other jolting noise is when the compressor kicks back on. The initial couple of seconds is a little jarring when you're asleep.

Any thoughts or ideas appeciated!

Bob