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Steve
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I received a call today from a client asking for a sound barrier to be constructed around their 2 outside A/C-Heat pumps. Neighbors complaining about the noise while they sit on their patio. Besides a sound blanket over the compressor itself, all I can think of right off is a 3 sided, 6 ft high fence looking barrier with PT plywood behind the fence boards. Any good solutions you have seen??
Thanks,
Steve
 

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The unit will require a min of 24" clearance between it and the barrier.
May need more. possibly 3'.
The higher the barrier, the more clearance you need. To prevent the unit from drawing its own air back into it. Specially heat pumps.

Keep in mind. That the outdoor unit, moves more air per ton then the indoor unit does. Usually, about 2-1/2 times as much, and sometimes even more. A 3 ton heat pump, may need 3600CFM for the outdoor unit.
Even though the indoor is only moving maybe 1200 CFM.
 
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