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7 Noises From Your HVAC System and What They Mean

7 Noises From Your HVAC System and What They Mean

Posted by
Ed Miller on Fri, Sep 25, 2020

Is the thwapping noise from your air conditioner drowning out the dialogue on your favorite show? Shouting over the bang-bang-bang noise that happens when your air conditioning turns on? Sometimes, we get used to the familiar HVAC noises we hear every day, and we forget they might mean trouble for us later down the road.

Every noise your air conditioner makes means something. While some are normal and can be ignored, others require the attention of a professional. They could signal that your system needs maintenance to avoid a serious and even dangerous issue.

HVAC Noises and What They Might Mean

Our everyday HVAC noises become part of the background of our lives. We might even forget they are happening until someone points them out. Take a moment to really listen to your air conditioner as it runs. What HVAC noises do you hear?

  • Buzzing. A buzzing noise could mean your compressor is having troubles. It might also mean your refrigerant is leaking and may cause your unit to freeze. In the best cases, it may mean a loose part is vibrating somewhere. It is worth checking out.
  • Clicking. A clicking noise from your AC unit might be the inside air handler or the compressor on the outside. A technician can tell you which it is. If it is coming from the furnace in cold weather, and the furnace has been off a while, it means your system is working! But if it continues, it might be an issue with the pilot light and it needs to be checked out by a professional.
  • Squealing or screeching. If screeching is one of your common HVAC noises, look to the fan belt in the blower. It might need replacement. It might also be a motor in need of lubrication. Call a technician to ensure this is done properly and with the correct lubricant.
  • Thwapping. An obnoxious “thwap” noise that happens over and over can indicate an object stuck in the blower’s fan blades. While it’s likely not harmful, it is annoying and can cause unnecessary wear on your system. Call a professional to help.
  • Rattling, Banging, or Clanking. While these HVAC noises might be a furnace blower assembly or the motor, they can indicate something more serious. Louder banging noises while the blower is running indicate a very serious problem. Turn off the system and call a professional right away.
  • Popping. Popping noises from your ductwork while your heater is first starting are common. They mean the cold ducts are expanding in the heat. If popping noises come from anything else, or they continue and don’t stop, you should have your system looked at.
  • Booming. In terms of HVAC noises, booming usually means your furnace is attempting to light from the electronic ignition or pilot, but is not succeeding. These failures allow gas to build up inside the combustion chamber, and when they do ignite, it’s all at once. This can become dangerous. Have your system looked at right away.

Reclaim Your Peace and Quiet with Snyder Heating & Air Conditioning

You don’t have to live with a noisy air conditioner. Snyder Heating & Air Conditioning can help! Contact us today to schedule a check-up for your HVAC noises!

where you’ll find snyder

Snyder Air Conditioning, Plumbing and Electric serves families across Florida. You'll find our technicians are just a short phone call away in neighborhoods throughout these counties:


  • Alachua
  • Baker
  • Clay
  • Duval
  • Flagler
  • Nassau
  • St. Johns


  • Broward
  • Martin
  • Miami-Dade
  • Palm Beach
  • St. Lucie

Customer Reviews

This was an exceptional experience! We woke up to our A/C on but not cooling (it was 6am and already 81 in the house). The person who set up our appointment was very nice, able to get us seen same-day, and let us know of some options to help save us money.

-Christy Cormier

The service from Sam and Chris was excellent! They were very knowledgeable and professional. They were able to answer all of my questions and completed all of my electrical issues. I will definitely use them again for future jobs. Thank you!

-Adrienne Beal

From the get go I could tell that the Snyder employees were truly professionals and didn’t push to make sales like other companies I’ve talked to my whole life. They took the time to explain so that I could make a decision. The installers and later the duct cleaners were very respectful during their work here. Thank you.

-Mike Daniels

Snyder Heating and AC is dependable, always on time and techs have always been courteous and knowledgeable. Emanuel was a great addition to the company. He was friendly and knew what he was doing. Thank you for great service.

-Linda Ackley

Snyder came in and did a total overhaul of our duct system. They had a great knowledge of what to do to make our home so comfortable! The technicians were all so professional and took great care of us! We’re so thankful for their expertise. Great and easy communication with the call center. We will definitely use them again!

-Crystal Hill

Snyder provided an amazing experience from start to finish. Most of us dread getting estimates with pressuring salespeople. Erik was a great guy, explained all my options and didn’t try to pressure me to act quickly! Justin followed up with my husband and I to offer further assistance in our decision. Again, no pressure, just helped with our follow up questions.

-Michele Bauer

Very prompt, professional, courteous, and cleaned up after repair. Had water line break in my front yard and no pressure. Very pleased and would highly recommend Snyder for all your plumbing, and AC needs. Thank you for making a rough morning get better with ease and professionalism.

-Chuck Jr.

Snyder was easy to get in contact with and had availability the next day. Clint came out and needed some parts so had to reschedule us for the next day for installation. He did a great job converting our old 3 knob shower to one. Looks great! Professional and courteous. 100% recommend this company, especially Clint.

-Nicole Hansen

Very thorough and professional Job

-John Ridenour

Excellent work. Hard worker. Highly recommend.

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