Why Is My Air Conditioner Making A Noise?

July 26, 2019

Hearing weird noises when your air conditioner is on? There's probably something wrong with your unit. If you ignore it, it could lead to major—and expensive—issues later. We're going to help you understand what’s happening with your air conditioner and what you can do to change it.

8 Common Air Conditioning Noises

  • Gurgling - Gurgling usually indicates a complication with your refrigerant line. If you can't identify where the noise is originating from, that's alright. A professional 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 create a noise outside your house. Mature ductwork can create noise inside your house. Check out our crackling noise guide for more information.
  • Hissing - Hissing can be caused by a faulty refrigerant line, an internal valve leak or the compressor. Look through our hissing noise guide for more info.
  • Buzzing - Buzzing is no doubt an electrical issue. Check out our buzzing noise guide for further information.
  • Clicking - Clicking can indicate 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 due to a loose part. Go through our pulsating noise guide for more information.
  • Loud Noise - A noticeable noise from your external unit can indicate an issue with your compressor, damper, fan or air handler. Look at our loud noise guide for more information.
  • Humming - Humming can be related to fan motor issues or a damaged relay switch. Head to our humming noise guide for more information.

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


Should I keep running my air conditioner 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 almost impossible to answer this question without looking at 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 recognize there's an issue with your air conditioner. While AC repairs can be stressful and an unexpected expense, 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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