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Question DetailsAsked on 12/12/2016

have air conditioner in attic. i hear a loud vibrating sound in all my 4 bedrooms

i went to attic to hear the sound and what i feel is there is no issue with the unit. Any idea if the issue is with the wood. Please help

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2 Answers

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Assuming this vibration noise occurs only when the A/C is running (which should be real easy to check out), and you cannot find loose mounting bolts or loose metal ducting thgat is vibrating, then you should not quit using the unit and call a Heating and A/C tech to check it out.


Could be it is low on refrigerant (which also carries the lubricating oil around for the compressor, so very low gas pressure equals fried compressor), could be it is not running at correct operating pressures (due to above or a control valve failure) so the compressor is encountering liquid in the intake fluid (which is VERY hard on compressors), could be a misbalanced fan (bearings going bad, debris caught on blade, loose fan blade), could be attic is getting too cold so unit is freezing up, etc - or any of a number of less common causes. Either way, let it go until it breaks and take the risk of having a major replacement bill - or quite likely save yourself a hefty bill or a totally new unit cost by shutting it down and getting it fixed as soon as it starts making unusual noises.


Only way I can see it is a problem with the wood, unless your house is rotting away under you or has an invasive wood-eating ant infestation, is if the drainage of condensate has been wetting the wood it is mounted on so the mounting bolts have gotten loose as the soft wet wood deforms or rots - which should be pretty easy to detect if that is the problem.

Answered 1 year ago by LCD

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Answered 1 year ago by Member Services




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