We have a View 24G and I installed the Wacko A/C silencer and it made a HUGE difference in the noise level when running the A/C and heat pump.
The Coleman plastic air diffuser is the worst design ever.
The A/C silencer has a nice thick air filter and felt insulation to further dampen the noise from the unit. What it really does is make for a much better separation between the intake and output chambers for air flow through the A/C unit. I also made sure that there were no gaps or holes for air to escape or leak while running the unit.
So, I would recommend the silencer if you are looking to quiet down the jet engine noise from the A/C. It doesn't completely make the unit noise free but it sure does make it so you can have a conversation and listen to TV without having to raise you voice or the volume.
I give it a definite thumbs up!!