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Old 05-10-2011, 02:20 PM   #1
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Put outside AC units on rubber feet?


Hey all,

I've got a newly finished room in my basement with full-height cement walls on one side. Through that wall is dirt. Sitting on top of that dirt - level with the ceiling of the basement - are 2 AC units. They are each sitting on their own concrete pads which are not connected to the house.

When running - they must shake the ground, where the sound travels throught he dirt, into the concrete wall - and generally into this room. It's just a buzz - but enough to be annoying.

I want to cut down on that sound. Can I lift them up and stick rubber feet or something under them?

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Old 05-10-2011, 02:59 PM   #2
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Put outside AC units on rubber feet?


Yes.






http://www.acousticalsurfaces.com/mo...per_w_pads.htm

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Old 05-10-2011, 04:26 PM   #3
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Put outside AC units on rubber feet?


Could be the line set that is transferring the noise.
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Old 05-10-2011, 06:12 PM   #4
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Put outside AC units on rubber feet?


Those pads absorb a lot of the vibration.
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Old 05-11-2011, 02:48 AM   #5
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Put outside AC units on rubber feet?


Don't use the cork type pads outdoors, they will disintegrate. Use the all rubber or rubber/foam combo. I'm with beenthere on the lineset thing, pads should always go under outdoor units anyway
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Old 05-11-2011, 07:04 AM   #6
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Put outside AC units on rubber feet?


Years ago GE used to put them in the box with the condensing units. Hard rubber like hockey pucks.
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Old 05-11-2011, 03:51 PM   #7
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Put outside AC units on rubber feet?


I wonder if those rubber interlocking kids play mats would work - we had furniture on them for a year, and the feet compressed them but not completely. Don't know what would happen though if they are exposed to weather.

I understand the acoustical properties of the first reply's solution.

Anyone know of a simpler, cheaper solution like what I suggested?
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Old 05-11-2011, 04:10 PM   #8
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Put outside AC units on rubber feet?


It doesn't get any easier then sticking some rubber anti-vibration pads under the unit. Cheaper? Well I suppose you could pick up a junk tire and cut squares instead of buying the pads.
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Old 05-11-2011, 04:26 PM   #9
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Put outside AC units on rubber feet?


May cost more for the hacksaw blades to cut thru the steel belts of the tire than the pads.

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