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 unit. If you don’t fix it, it could lead to extensive—and expensive—issues eventually. We're going to help you figure out what’s occurring with your air conditioner and what you can do to change it.

8 Common Air Conditioning Noises

  • Gurgling - Gurgling normally indicates a complication with your refrigerant line. If you can't identify where the noise is emanating from, that's alright. A technician 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. Aging ductwork can cause 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. Check out our hissing noise guide for more info.
  • Buzzing - Buzzing is likely an electrical issue. Read our buzzing noise guide for more information.
  • Clicking - Clicking can hint 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 external unit can signal an issue with your compressor, damper, fan or air handler. Look at our loud noise guide for more information.
  • Humming - Humming can arise from fan motor issues or a busted relay switch. Head to our humming noise guide for more information.

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


Should I keep running 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 examining your system.

Usually, we recommend turning the unit off and contacting 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 unit. While AC repairs can be stressful and an unexpected expense, it's best to get problems corrected right away. Getting 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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