AC Techs Inspecting AC Noises

Why Is My Air Conditioner Making A Noise?

Published on 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 significant—and expensive—issues down the road. 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 problem with your refrigerant line. If you can't determine where the noise is originating from, that's alright. A technician can help verify 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 create a noise outside your house. Old 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. Check out our hissing noise guide for more info.
  • Buzzing - Buzzing is no doubt an electrical issue. See 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. Check out 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. Check out our loud noise guide for more information.
  • Humming - Humming can be related to fan motor issues or a busted relay switch. Read through 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 AC when it’s making a noise?

There are limited cases where you can continue to run your AC, but you do so at your own risk. It's difficult to answer this question without examining your system.

Most of the time, 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 suspect there's something wrong with your system. 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 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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