Soundproofing an outdoor air conditioner

 A common question I get from my customers is, "How do I soundproof my outdoor AC compressor?" There is a simple method whereby you can reduce the noise of an outdoor air conditioning compressor. The first step would be to construct an enclosure around the unit. Something like a small redwood or cedar fence. You will want the enclosure to be about 2-3ft away from the compressor itself so as to provide adequate ventilation to the compressor. You will need to construct a gate so you are able to service the unit when needed. For the best soundproofing, you will want to build the enclosure to at least the 8 ft level, this will insure that you get as much outdoor soundproofing as possible. Sound likes to travel linerally so if it has to climb up 8ft of soundproofed fencing, you will be able to reduce the noise if the compressor greatly.
 Once the posts and cross members are installed it is recommended that you apply a layer of the 1# mass loaded vinyl to the fence structure itself. mass loaded vinyl or (MLV for short) is a barrier material that is made from a high grade vinyl that it impregnated with barium salts and silica to give it mass. It was designed to emulate lead sheeting, but it contains No Lead. You would staple the MLV directly to the fence structure using either a plastic cap stapler of a nail gun that shoots the roofing nails with the large plastic heads. We also recommend that you over lap the MLV where ever possible. A 1" over lap is fine. Now that the MLV membrane is installed, you will want to caulk the seams as well as around the perimeter using an acoustical caulk. it is also a good idea to tape all of the seams with an MLV seam sealer tape. This will insure that the vinyl barrier is sealed properly. I forgot to mention, it is a good idea to install the MLV on the outside of the fence structure, that way it will be partially protected from the elements. The last step is to nail up or screw the vertical dog eared slats directly over top of the MLV barrier. If this enclosure is at least 8' high then you should experience a marked sound reduction for the air conditioning compressor.
 I hope this has been helpful. This method also works if you are building a complete fence between you and your neighbor. If you have further questions please feel free to call us toll free or to e-mail me at tech@soundproofingamerica.com. This is Bob O. for Soundproofing America, Inc
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