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Old 07-17-2008, 01:06 PM   #1
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Noisy vibration of A/C lines in wall cavity


My compressor makes a rather loud hum audible inside the house due to vibration in the HVAC lines in the wall space. I can feel the drywall vibrating, and I can make it louder by pushing in on the drywall. It is most severe in one place, which suggests to me that maybe it's contacting the wall in just that place. I'm thinking about cutting a hole in the wall to the side of the HVAC lines and trying to straighten them or somehow isolate them from the wall. Anyone ever done anything like this? (Jiggling from the attic side didn't help, and there is no play where they enter the wall from the outside.)
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Old 07-17-2008, 04:45 PM   #2
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Noisy vibration of A/C lines in wall cavity


you can cut open the wall no problem but be careful disconnect the power at the fuse box first to the airhandler and condenser in case you hit the wire ( usualy low voltage but better safe then sorry)
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Old 07-17-2008, 05:17 PM   #3
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Noisy vibration of A/C lines in wall cavity


has it always been like that or just in the hotter weather...check your compressor at the mounting bolts within the condenser you might have the tube of metal still in there and with them tight it will go right down the copper into the walls.if it gets noisier in the warmer days condenser might need cleaning...blocked or matted condenser will produce higher head pressure and louder running sounds...is the thin copper line comng out real hot on a 75F morning if it is you condenser is in need of cleaning.make sure the lines within the condenser are not touching the base of the condenser(only ones within are the discharge and liquid going out to evap/furnace)
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