Why Is My Air Conditioner Making A Noise?

July 26, 2019

Hearing weird noises when your air conditioner is on? There's likely something wrong with your system. If you don’t pay attention to it, it could lead to extensive—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 normally indicates a problem with your refrigerant line. If you can't pinpoint where the noise is emanating 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 result from debris in the unit or aging ductwork. Debris in the outdoor unit will cause a noise outside your house. Aging ductwork can cause noise inside your house. Browse our crackling noise guide for more information.
  • Hissing - Hissing can be caused by a leaky refrigerant line, an internal valve leak or the compressor. Check out our hissing noise guide for more on that.
  • Buzzing - Buzzing is likely an electrical issue. See 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. Check out our pulsating noise guide for more information.
  • Loud Noise - A clear noise from your outside unit can signal an issue with your compressor, damper, fan or air handler. Read our loud noise guide for additional information.
  • Humming - Humming can be related to fan motor issues or a busted relay switch. Check out our humming noise guide for more information.

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


Should I keep using my system when it’s making a noise?

There are a few 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 calling a professional.

When should I do something about the noise?

We recommend calling a professional as soon as you suspect there's an issue with your unit. While AC repairs can be stressful and an unexpected cost, it's best to get problems corrected right away. Calling 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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