Experience with dampening a/c compressor noise?


Old 07-26-17, 12:40 PM
Thread Starter
Join Date: May 2010
Location: USA
Posts: 471
Received 23 Votes on 18 Posts
Experience with dampening a/c compressor noise?

I have an LG-brand 6000 BTU 115-Vac window air conditioner that the compressor is ridiculously loud on. Has been since day one, unchanged for about the 18 months it's been in use. According to the sound-meter on my smartphone, measuring from three feet away, when the compressor kicks in, the noise level goes up 9 dbs. If my smartapp is close to correct, that means the compressor is eight times as noisy as the unit's regular racket. Which is ridiculous. When the compressor switches on, it sounds like a jet engine on start-up. It otherwise cools great and holds a steady temp, no noticeable deterioration of performance in the time it's been in use, ...it's just LOUD.

From my research, the two leading candidates are rubber feet under the compressor mount points and a sound blanket around the compressor itself. As for the rubber feet, I haven't had the case open yet (because it's still under warranty) but the effectiveness of something like that would seem to me to hinge on exactly how the compressor is attached. For instance, it it's spot-welded to the case, it's a non-starter. But even bolt-down would seem to diminish the effectiveness of rubber insulators because some vibration is bound to travel through the bolts themselves.

The sound blanket sounds plausible but my main concern with that is what it does for the life-expectancy of the compressor, since it also undoubtedly will hold in heat along with the noise. And just how much noise reduction do I get in exchange for a reduced service life?

Has anyone tinkered with anything like this, specifically targeting the compressor? If so, I'd like to know because I'm about half-way to expiration of the warranty. If I knew someone had managed to significantly reduce compressor noise, I'd give serious consideration to voiding the remainder of the warranty and giving it a whirl.
Sponsored Links
Old 07-26-17, 01:53 PM
Join Date: Feb 2014
Location: USA
Posts: 2,104
Received 0 Votes on 0 Posts
The compressors already have rubber vibration eliminators. Blankets will not shorten the life of a compressor.
Old 07-26-17, 04:21 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 57,733
Received 924 Votes on 863 Posts
Typically the rubber mounting method is four rubber grommets placed in slotted flanges at the base of the compressor. Then there are four hold down bolts or four studs that are welded to the case that pass thru the grommets. No actual metal to metal contact.

There is very little room to add any type of blanket to the compressor.

The cases have become so thin that they resonate and transmit the compressor noise.
Basically..... it is what it is.
Old 07-26-17, 07:07 PM
GregH's Avatar
Super Moderator
Join Date: Jan 2001
Location: Manitoba
Posts: 10,128
Received 34 Votes on 32 Posts
The maker of your air conditioner went to great expense to make the least expensive air conditioner possible.
As suggested not much can be done except replace it with a quieter one.
Old 07-26-17, 08:05 PM
Join Date: Aug 2008
Location: Texas, California
Posts: 1,485
Received 0 Votes on 0 Posts
May be it is a bad unit. I had an 8000btu LG air conditioner 2 years ago, it was pretty quiet.
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: