Why Is My Air Conditioner Making A Noise?

July 26, 2019

Hearing strange noises when your air conditioner is working? There's probably something wrong with your system. If you ignore it, it could lead to significant—and expensive—problems eventually. We're going to help you find out what’s occurring with your air conditioner and what you can do to change it.

8 Common Air Conditioning Noises

  • Gurgling - Gurgling generally indicates an issue with your refrigerant line. If you can't identify where the noise is coming from, that's alright. A technician can help verify where this noise is occurring. You can learn more information on our gurgling noises guide.
  • Crackling - Crackling could come from debris in the unit or aging ductwork. Debris in the outdoor unit will generate a noise outside your house. Aging ductwork can produce noise inside your house. Browse our crackling noise guide for more information.
  • Hissing - Hissing can come from a faulty refrigerant line, an internal valve leak or the compressor. Check out our hissing noise guide for more info.
  • Buzzing - Buzzing is likely an electrical issue. Read our buzzing noise guide for more information.
  • Clicking - Clicking can hint you have a loose part or that the fan is misaligned. You can check out more information in our clicking noise guide.
  • Pulsating - Pulsating can be caused by a loose part. Go through our pulsating noise guide for more information.
  • Loud Noise - A noticeable noise from your outdoor unit can mean an issue with your compressor, damper, fan or air handler. Check out our loud noise guide for additional information.
  • Humming - Humming can begin with fan motor issues or a broken relay switch. Read through our humming noise guide for more information.

You can find additional information about common air conditioning troubles on energy.gov


Should I keep running my AC when it’s making a noise?

There are limited cases where you can continue to run your AC, but you do so at your own risk. It's hard to answer this question without inspecting your system.

Most of the time, we recommend shutting off the unit off and contacting a professional.

When should I do something about the noise?

We recommend calling a professional as soon as you recognize there's a problem with your unit. While AC repairs can be stressful and an unexpected cost, it's best to get problems fixed right away. Getting a professional could help reduce future expenses and keep your system running longer.

Not sure if your air conditioner is making any of these noises? Please fill out the form below for a free, in-home consultation.

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