Why Is My Air Conditioner Making A Noise?

July 26, 2019

Hearing weird noises when your air conditioner is working? There's a strong probability there’s something wrong with your AC. If you ignore it, it could lead to major—and expensive—problems later. We're going to help you figure out what’s occurring 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 pinpoint where the noise is emanating from, that's alright. A technician can help verify 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 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 caused by a damanged refrigerant line, an internal valve leak or the compressor. Peruse our hissing noise guide for more info.
  • Buzzing - Buzzing is likely an electrical issue. See our buzzing noise guide for further information.
  • Clicking - Clicking can mean you have a loose part or that the fan is misaligned. You can see more information in our clicking noise guide.
  • Pulsating - Pulsating can come from a loose part. Go through our pulsating noise guide for more information.
  • Loud Noise - A noticeable noise from your outside unit can mean an issue with your compressor, damper, fan or air handler. Look at our loud noise guide for supplementary information.
  • Humming - Humming can arise from fan motor issues or a damaged relay switch. Head to our humming noise guide for more information.

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


Should I keep operating my AC 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.

In most cases, 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 think there's a problem with your air conditioner. While AC repairs can be stressful and an unexpected spend, it's smart to get problems taken care of right away. Contacting a professional could help lower 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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