Author Topic: Noisy air conditioner  (Read 3615 times)


  • Guest
Noisy air conditioner
« on: July 31, 2006, 05:01:34 PM »
Hi !  I live in a condo building, on the 3rd floor.  Below my bedroom, at the ground level, is a newly installed air-conditioner which is extremely noisy, emitting a constant high-pitch wailing sound which I can hear not only in the bedroom but in the whole unit.  On the second level, directly under my neighbour's unit, is a large locker room constructed of bare concrete and filled with metal lockers.  The north wall of that room joins the south wall of my bedroom and this is where the noise is coming from.  What would have to be done to soundproof my bedroom or at least reduce the noise to an acceptable level ?  Management's attempts to fix the air conditioner has had little success so far.  Your advice will be greatly appreciated.   Thank you.  


  • Guest
Re: Noisy air conditioner
« Reply #1 on: August 04, 2006, 05:49:43 PM »
Hi Deana,

Using closed cell acoustic foam is very effective.  You will need to apply it to the bottom of a barrier that is above the air conditioning unit in order for it to be effective in absorbing and blocking the sound coming up to your unit.  There is a lot of helpful information on controling noise from air conditioners at this link on the web site:

To soundproof your bedroom wall adjacent to the locker room, apply two layers of 1/8" thick MLV (Mass loaded vinyl) to the existing wall and then cover that with finish layer of 5/8" drywall.  That will add 40 STC to the wall.  The MLV is available with a pressure sensitive adhesive (PSA) back for a peel & stick application (the PSA also acts as a decoupler between MLV layers).  This solution only takes up 7/8" and is a common solution for party wall noise problems in condos.  For MLV info see