Why Is My Air Conditioner Making A Noise?

July 26, 2019

Hearing odd noises when your air conditioner is running? There's a strong probability there’s something wrong with your unit. If you ignore it, it could lead to major—and expensive—issues down the road. We're going to help you understand what’s happening with your air conditioner and what you can do to correct 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 find more information on our gurgling noises guide.
  • Crackling - Crackling could be due to debris in the unit or aging ductwork. Debris in the outdoor unit will cause a noise outside your house. Mature ductwork can cause noise inside your house. Read our crackling noise guide for more information.
  • Hissing - Hissing can be created by a damanged refrigerant line, an internal valve leak or the compressor. Look through our hissing noise guide for more info.
  • Buzzing - Buzzing is no doubt 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 find more information in our clicking noise guide.
  • Pulsating - Pulsating can be due to a loose part. Check out our pulsating noise guide for more information.
  • Loud Noise - A clear noise from your outside unit can indicate an issue with your compressor, damper, fan or air handler. Look at our loud noise guide for additional information.
  • Humming - Humming can be related to fan motor issues or a broken relay switch. Head to our humming noise guide for more information.

You can find more information about frequent air conditioning issues on energy.gov


Should I keep using 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 looking at your system.

Usually, 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 think there's an issue with your unit. While AC repairs can be stressful and an unexpected spend, it's best to get problems corrected right away. Contacting a professional could help minimize 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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