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Old 03-25-2019, 12:06 PM   #1
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AC noise

I have a 20 year old Bounder in excellent condition and everything works just fine. Other than the ride and handling, which I hope to be fixing soon, the only real complaint is how loud the AC units are. It makes sleeping difficult and you have to raise your voice to have a conversation. Kinda like sitting next to a 747! I realize it's 20 year old technology but does anyone have any suggestions on how to cut down on the noise?
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Old 03-25-2019, 05:25 PM   #2
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Quote:
Originally Posted by Oldcarnut View Post
I have a 20 year old Bounder in excellent condition and everything works just fine. Other than the ride and handling, which I hope to be fixing soon, the only real complaint is how loud the AC units are. It makes sleeping difficult and you have to raise your voice to have a conversation. Kinda like sitting next to a 747! I realize it's 20 year old technology but does anyone have any suggestions on how to cut down on the noise?
there was recently a thread on newer designed AC covers. I followed that as our AC was load also. I purchased the Wacko Products AC cover for our Dometic units. They did improve the sound, lowered it, to a reasonable level for a reasonable cost. There was also another brand discussed which was more expensive but I do not recall the name. Also several users had made their own. Search for the Wacko products AC covers and you should find the thread. Alo they have info on their website.
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Old 03-25-2019, 05:40 PM   #3
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Don't have any personal experience with these having just discovered them a few days ago!

https://wackoproducts.com/
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Old 03-25-2019, 09:26 PM   #4
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20 years old is very old in the a/c world, time to replace both units, my friend just replaced both of his units and can't believe the difference, super cold and quiet.
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Old 03-25-2019, 11:02 PM   #5
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If your in the market for modern units look at AtWood. I was simply amazed at how quiet the one I bought is and how well it works compared to a basically new Dometic model!
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Old 03-26-2019, 05:06 AM   #6
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Oldcarnut, make some yourself like I did. Very effective and inexpensive. I posted here in a previous article.
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Old 03-26-2019, 05:31 AM   #7
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Oldcarnut, make some yourself like I did. Very effective and inexpensive. I posted here in a previous article.
that looks effective for the noise but I would think you would need a divider wall between the intake and exhaust. Seems there would be a LOT of mixing of air before it escaped to the sides. A 1" strip of fome would solve that problem and make it more efficient
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Old 03-26-2019, 05:40 AM   #8
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If your in the market for modern units look at AtWood. I was simply amazed at how quiet the one I bought is and how well it works compared to a basically new Dometic model!

As of a year or so ago the Atwood was only available as a standalone unit. If multiple units were installed, each unit was independent and each unit required a thermostat. Things may have changed since then but some research might be needed.
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Old 03-26-2019, 07:00 AM   #9
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I purchased and installed (very easy to do) the WackO a/c silencer for the Dometic unit on my MH. It definitely made a noticeable difference. No more blaring the TV while a/c is running
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Old 03-26-2019, 11:21 AM   #10
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Goseejoe, the vents in your coach look like the ones in the video from Wacko. The return and the vent are side by side on the same panel. Mine are different. I have one square return for each unit and several separate 4x10? vents. I'm not sure that yours or Wacko's would work for my application. The rush of air from the vents is noisy but I've never really paid much attention to any noise coming from the returns. The units themselves make a lot of noise. Someone commented about a friend replacing both of their units and that they worked better and were much quieter. I'm sure they would be for me as well but I'm trying to avoid the $1000 plus labor to replace them. They still blow cold. Like I said, its a 20 year old Bounder, not a 5 year old Tiffin. Its what I can afford. Any more ideas, anyone?
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Old 03-26-2019, 11:43 AM   #11
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In my experience the noise is largely air rushing through & out the [poorly designed] ducts. Re-working the ducts and outlets may help, but is pricey and a large effort. Some RV makers do a halfway decent job of a/c ducting, but Fleetwood isn't one of them.
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Old 03-26-2019, 02:23 PM   #12
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My design works well as all three of our ac units are ducted to the side of the coach. We only use the blaster vent in the rear unit to quickly cool down the bedroom as it gets warm back there due to engine heat.
I confirmed the noise reduction using a sound meter app.
Most noise in our rig was from the intake air.
Have fun experimenting and finding a solution. It was a fun project compared to some of the stuff necessary to maintain a bus.
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Old 03-26-2019, 09:22 PM   #13
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Maybe this was already asked, when was the last time you replaced your filters?
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Old 03-26-2019, 10:07 PM   #14
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Originally Posted by bruceisla View Post
As of a year or so ago the Atwood was only available as a standalone unit. If multiple units were installed, each unit was independent and each unit required a thermostat. Things may have changed since then but some research might be needed.
Ours has the built in thermostat in the control panel that is on the AC its self, It only needs Power and ground hooked up. See no reason multiple ACs couldn't all run by themselves all with their own built in thermostats.

Dometic has since bought Atwood but as far as I am aware they have not made any changes to the brand or introduced any of their tech and are still made in Australia all of which is a huge bonus!
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