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Old 05-23-2013, 07:48 AM   #11
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The noise was never that loud that it bother me. We have an 08 xl378
But I will tell you my DW like to keep the bedroom like a meat locker when we slept.
I even put in a 12v oscillating fan on her side of the bed.
Thank Goodness the A/C's work fine.
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Old 05-24-2013, 12:06 AM   #12
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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.
Thanks for the good idea. I also had a problem with the AC duct being open to the bathroom skylight. Lots of leaks from there

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Old 06-08-2013, 09:22 PM   #13
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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?
Iggy you are correct. The A/C like the refrigerator is a Dometic. I was told by the dealer to NOT run the units on Low or Auto if it is over 80 degrees outside in order to avoid freezing. Do you agree with that? BTW it is air movement that is making the noise.

The refrigerator is another story. Because of temperature swings we probably lost $100 worth of food. Hopefully I can find someone near where I live but I am not holding out much hope!! Fortunately it is still under warranty for a few more months.
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Old 06-08-2013, 10:11 PM   #14
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I was told to not use the louvers on the unit except for a quick dump of cold air to first cool the rv off. Other than that the louvers on the a/c unit should remain closed to avoid freezing up the unit.
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Old 06-10-2013, 07:14 AM   #15
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Thanks for the good idea. I also had a problem with the AC duct being open to the bathroom skylight. Lots of leaks from there

Attachment 31217
I see your skylight looks just like mine did. I ended up stuffing insulation around it then aluminum taped it closed. It stopped all of the saw-dust from laying in the bottom of the skylight.
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Old 06-12-2013, 07:16 PM   #16
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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?
Had the same noise problem with a vibration, went on the roof and noticed the fan shaft was spinning out of true. Removed the fans and no vibration, and a lot less noise. bought new fans and no more issues.
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