Why Is My Air Conditioner Making A Noise?

July 26, 2019

Hearing weird noises when your air conditioner is on? There's likely something wrong with your unit. If you don’t pay attention to it, it could lead to extensive—and expensive—issues down the road. We're going to help you understand what’s occurring with your air conditioner and what you can do to correct it.

8 Common Air Conditioning Noises

  • Gurgling - Gurgling generally indicates a problem with your refrigerant line. If you can't pinpoint where the noise is emanating from, that's alright. A technician can help find out where this noise is occurring. You can read 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. Aging 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 probably an electrical issue. See our buzzing noise guide for more information.
  • Clicking - Clicking can hint 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 caused by a loose part. Check out our pulsating noise guide for more information.
  • Loud Noise - A noticeable noise from your outside unit can signal an issue with your compressor, damper, fan or air handler. Read our loud noise guide for more information.
  • Humming - Humming can arise from fan motor issues or a busted relay switch. Check out our humming noise guide for more information.

You can find additional information about common air conditioning problems on energy.gov


Should I keep running my AC 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 inspecting 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 think there's an issue with your system. While AC repairs can be stressful and an unexpected cost, it's best to get problems fixed right away. Getting a professional could help reduce 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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