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Old 05-19-2013, 10:07 AM   #1
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Noisy A/C Units on my 2011 GT 378 TS

Does anyone have any suggestions for what we can do to lessen the A/C noise? The bedroom is especially loud when we are trying to sleep and the one in the main cabin makes it difficult to hear the TV. They seem to never shut off. We are currently in FL so of course the humidity is farily high and the temperatures are in the low to mid 80's.
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Old 05-19-2013, 11:32 AM   #2
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We have the same issue. We try to cool down the rear area before bedtime and turn the rear A/C off before bedtime and the front unit on high. Then we close the vents in the front to force more air to the rear.

If warmer, we sleep with a fan.

Then we reverse the logic if trying to watch TV. During the heat of the day, we run both units as required.

Bill
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Old 05-19-2013, 01:43 PM   #3
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I have a 2012 georgetown 378,the rear air was very noisy,took to a dealer and they found the rear air was drawing too many amps making it very noisy.The new one still makes some noise,but a lot less than the old one.
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Old 05-21-2013, 08:49 PM   #4
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We have a 2010 Georgetown 330 TS (model no longer offered) and it was equipped with two Carrier Air Conditioners. Since late 2010, Carrier has quit making motorhome air conditioners.........figures huh? What brand are Georgetowns coming equipped with nowadays, and its that the same brand everyone is discussing here?
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Old 05-21-2013, 09:41 PM   #5
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Bill. I tried your suggestion and what a difference it made. The units are still noisy/loud but at least now it is in a different room!
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Old 05-21-2013, 09:44 PM   #6
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Ken - I don't know what brand I have but I do need to find out!
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Old 05-21-2013, 10:00 PM   #7
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Ken - I don't know what brand I have but I do need to find out!
Probably both AC are by Dometic.
MIne are also very loud but the loudness is from the massive about of air movement and the fan not the compressors.
Have you thought about trying to take the fans from AUTO to LOW speed and see what happens?
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Old 05-22-2013, 07:27 AM   #8
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The Return Grille is mounted directly to the bottom of the unit. All of the noise radiates through the Return from the fans and compressor as well as just the air movement. It's not until you get into the higher priced units where you'll find room to room returns and the system is sealed. I know Winnebago used to mount their AC Units in the basement storage compartment but I believe they're back to rooftop units, but with both a ducted return as well as supply registers. We run ours on low fan on both units once the coach cools down. During the night we run the front AC unit on Hi and close off a few registers in the front. It pushes enough air to the rear to keep it comfortable. We sometimes use a small fan in the bedroom. If you haven't done this I recommend taking foam rubber from any electronic packaging, cut it to size and remove the last register on each side in the front and the last register on each side in the rear. Push the foam rubber into the ductwork so the air stops at that point instead of traveling all the way to the front and rear. You're shortening the length of the duct and don't need to rely on back pressure for the air to escape. In my case the front has more than 6 feet of duct after the last registers and 4 feet of duct after the rear bathroom register.
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Old 05-22-2013, 02:36 PM   #9
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Originally Posted by buddyu View Post
Does anyone have any suggestions for what we can do to lessen the A/C noise? The bedroom is especially loud when we are trying to sleep and the one in the main cabin makes it difficult to hear the TV. They seem to never shut off. We are currently in FL so of course the humidity is farily high and the temperatures are in the low to mid 80's.
Is it "air flow" noise or "mechanical" noise? We have a 2010 378 and don't have the problem. We usually have the fans on "low", however.

We had both units replaced while still under warranty due to a vibration noise (fan out of balance) and the air flow vibrating the foil that is part and parcel of the units. (we have Dometic Duo-Them units).
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Old 05-22-2013, 05:21 PM   #10
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ac noisy

mine was the same went to Elkhart and the problem is the rubber seal was to tight they fixt it now no more noise
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