Reducing noise from external a/c unit

Discussion in 'Renovation & Home Improvement' started by Vassago, 27th Feb, 2020.

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  1. Vassago

    Vassago Well-Known Member

    Joined:
    25th Jun, 2015
    Posts:
    129
    Location:
    Perth
    Have a large ducted reverse cycle (~16kw) unit done the side of the house and looking at ways to reduce the noise it makes. Where it is located, there is only ~1.5m between the house and boundary wall (both are brick) and the ground is paved. Being all hard surfaces the noise seems to reflect down to the backyard.

    Was thinking of putting some bamboo screening (more the thin,1cm bamboo) along the brick boundary wall to help absorb the sound and putting in a solid timber gate to reduce the amount of sound that travels to the back yard. Will this work? Any other suggestions?
     
  2. Paul@PFI

    [email protected] Tax Accounting + SMSF Business Plus Member

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    15,067
    Location:
    Sydney
    Bamboo wont absorb anything. Most of the noise is compressor or fan and is emitted from the fan opening. Straight up or out.

    There may be ways to limit noise inside the case prior to emission. However it is exposed to elements so lining the inside may overheat the unit if the foam etc is not suitable to external use and isnt the correct grade of foam for noise properties or its too thick reducing the internal space. Its also pricey.

    Not all foams are noise reducing and many cheap foams will offer poor attenuation or break down rapidly. Just because someone say it reduces noise doesnt eman its tested. You want lab results that show its acoustic.

    Pyrotek are a good well known provider
    Acoustic Sound Absorbing Foam, Combustion Modified | Pyrotek
     
  3. Chase71

    Chase71 Active Member

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    5th Jan, 2018
    Posts:
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    Location:
    Under Your Bed
    What brand is it?
    Some units have night quiet mode that can be activated via field code settings. Limits inverter compressor frequency and outdoor fan rpm.
    Need to understand what part of the outdoor unit is making the noise.
    Is it a high pitched frequency noise etc
    Could always insulate internal side of panels and throw another compressor blanket on it. Compressor is cooled by refrigerant returning back so overheating is not too much of an issue.
    If its more of a bad vibration google the model to see if it is shipped with shipping brackets on the compressor. Maybe installer forgot to remove them.
     
  4. Vassago

    Vassago Well-Known Member

    Joined:
    25th Jun, 2015
    Posts:
    129
    Location:
    Perth
    It is a Samsung.

    Have contacted the installer, when he calls back will see about getting a service and if he can do anything to make it quieter.