Why Is My Air Conditioner Making A Noise?

July 26, 2019

Hearing odd noises when your air conditioner is working? There's likely something wrong with your system. If you ignore it, it could lead to major—and expensive—issues down the road. 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 usually indicates a problem with your refrigerant line. If you can't identify where the noise is coming from, that's alright. An expert can help determine where this noise is occurring. You can find 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. Mature ductwork can produce noise inside your house. Browse 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 on that.
  • Buzzing - Buzzing is likely an electrical issue. Read 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 come from a loose part. Take a look at our pulsating noise guide for more information.
  • Loud Noise - A loud noise from your external unit can signal 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 broken relay switch. Read through 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 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 looking at your system.

Most of the time, we recommend turning 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 a problem with your air conditioner. While AC repairs can be stressful and an unexpected cost, it's better 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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