Why Is My Air Conditioner Making A Noise?

July 26, 2019

Hearing strange noises when your air conditioner is on? There's likely something wrong with your unit. If you ignore it, it could lead to major—and expensive—troubles eventually. We're going to help you figure out what’s happening with your air conditioner and what you can do to fix it.

8 Common Air Conditioning Noises

  • Gurgling - Gurgling usually indicates a problem with your refrigerant line. If you can't pinpoint where the noise is emanating from, that's alright. A professional can help find out where this noise is occurring. You can read 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 cause a noise outside your house. Aging ductwork can create noise inside your house. Read our crackling noise guide for more information.
  • Hissing - Hissing can come from a faulty refrigerant line, an internal valve leak or the compressor. Peruse our hissing noise guide for more info.
  • Buzzing - Buzzing is probably an electrical issue. Check out our buzzing noise guide for more information.
  • Clicking - Clicking can mean 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 due to a loose part. Take a look at our pulsating noise guide for more information.
  • Loud Noise - A clear noise from your external unit can mean an issue with your compressor, damper, fan or air handler. Look at our loud noise guide for additional information.
  • Humming - Humming can begin with fan motor issues or a busted relay switch. Head to our humming noise guide for more information.

You can find more information about prevalent 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 almost impossible to answer this question without looking at your system.

In most cases, we recommend shutting down the unit off and calling a professional.

When should I do something about the noise?

We recommend calling a professional as soon as you recognize there's an issue with your unit. While AC repairs can be stressful and an unexpected spend, it's better to get problems taken care of right away. Contacting 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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