Why Is My Air Conditioner Making A Noise?

Hearing weird noises when your air conditioner is working? There’s probably something wrong with your unit. If you don’t fix it, it could lead to extensive—and expensive—problems down the road. We’re going to help you understand what’s happening with your air conditioner and what you can do to correct it. 

8 Common Air Conditioning Noises 

  • Gurgling – Gurgling generally indicates a complication 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.
  • 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 cause noise inside your house.
  • Hissing – Hissing sounds coming from your AC can be created by a faulty refrigerant line, an internal valve leak or the compressor.
  • Buzzing – Buzzing is likely an electrical issue.
  • Clicking – Clicking can hint you have a loose part or that the fan is misaligned.
  • Pulsating – Pulsating can be due to a loose part.
  • Loud Noise – A clear noise from your external unit can signal an issue with your compressor, damper, fan or air handler.
  • Humming – Humming can arise from fan motor issues or a broken relay switch. Head to our humming noise guide for more information. 

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

Should I keep using 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 looking at 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 system. While AC repairs can be stressful and an unexpected cost, it’s smart to get problems corrected 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 schedule online for a free, in-home consultation.