Why Is My Air Conditioner Making A Noise?

July 26, 2019

Hearing weird noises when your air conditioner is running? There's a strong probability there’s something wrong with your AC. If you ignore it, it could lead to significant—and expensive—problems eventually. We're going to help you understand what’s going on with your air conditioner and what you can do to correct it.

8 Common Air Conditioning Noises

  • Gurgling - Gurgling usually indicates a problem with your refrigerant line. If you can't determine where the noise is emanating from, that's alright. An expert can help find out 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. Old ductwork can produce noise inside your house. Read our crackling noise guide for more information.
  • Hissing - Hissing can be caused by a faulty refrigerant line, an internal valve leak or the compressor. Peruse our hissing noise guide for more information.
  • Buzzing - Buzzing is likely an electrical issue. See our buzzing noise guide for additional information.
  • Clicking - Clicking can hint 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 caused by a loose part. Take a look at our pulsating noise guide for more information.
  • Loud Noise - A noticeable noise from your external unit can mean an issue with your compressor, damper, fan or air handler. Check out our loud noise guide for more information.
  • Humming - Humming can arise from fan motor issues or a broken relay switch. Check out our humming noise guide for more information.

You can find more information about prevalent air conditioning troubles on energy.gov


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

There are some 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 examining your system.

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

When should I do something about the noise?

We recommend calling a professional as soon as you suspect there's a problem with your unit. While AC repairs can be stressful and an unexpected expense, it's best to get problems taken care of 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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