This thread (below) discusses replacement options I looked at over the years, and towards the end lists multiple things I did to mine which quieted it down, somewhat. Still loud by my standards, but
quieter. We left our fan on low overnight which covered up the compressor cycling on/off, and we like white noise anyway. We put the fan on auto during the day.
It is amazing what you will put up with if you are tired enough. The last 4-week trip we took in our pod, on the 2nd night the A/C started squealing loudly. Spent the whole trip like that (turned out I could have fixed it on the road if I got up on the roof, didn't know that at the time).