Why Is My Air Conditioner Making A Noise?

July 26, 2019

Hearing odd noises when your air conditioner is on? There's likely something wrong with your system. If you don’t pay attention to it, it could lead to extensive—and expensive—problems eventually. We're going to help you find out what’s going on with your air conditioner and what you can do to correct it.

8 Common Air Conditioning Noises

  • Gurgling - Gurgling usually indicates a complication with your refrigerant line. If you can't pinpoint 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 result from debris in the unit or aging ductwork. Debris in the outdoor unit will generate a noise outside your house. Old ductwork can create noise inside your house. Check out our crackling noise guide for more information.
  • Hissing - Hissing can be created by a damanged refrigerant line, an internal valve leak or the compressor. Look through our hissing noise guide for more on that.
  • Buzzing - Buzzing is likely an electrical issue. Read 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 be due to a loose part. Take a look at 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 begin with fan motor issues or a damaged relay switch. Check out our humming noise guide for more information.

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


Should I keep running my system 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 hard to answer this question without inspecting your system.

Usually, we recommend shutting off the unit off and bringing in a professional.

When should I do something about the noise?

We recommend calling a professional as soon as you think there's something wrong with your unit. While AC repairs can be stressful and an unexpected cost, it's better to get problems taken care of right away. Contacting 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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