HVAC Noises: What Sounds You Shouldn’t Ignore

Oct 15, 2021 | HVAC Maintenance


When your HVAC system speaks to you, be sure to listen. A lot of the noises that our heating, ventilation, and air conditioning units make in our home aren’t loud enough to attract our attention. When everything is working well, you shouldn’t expect to hear much more than a gentle hum from your HVAC. But about those odd noises that require more investigation? Here are unusual sounds you may hear from your HVAC that you should never ignore.

Banging Noises

Anything that resembles some sort of banging, rattling, or thumping noise needs attention. This is a good sign that something is loose or that various parts of your unit are giving out. You’ll want to turn off your unit right away and call someone to take a look.

Buzzing Noises

Buzzing can signal that there is something off with the electrical system of your unit. Most common issues relate to the motor, wiring, or some other piece. With electrical concerns there is also always a risk of a fire so you will want to shut off your unit to prevent further damage.

Hissing Noises

If your AC unit starts whistling or hissing, this may be a sign that your refrigerant is leaking or that there is some type of air restriction through the normal airflow. This not only results in efficient cooling but if it is an issue with the refrigerant, you could end up with harmful chemical leaks in your home.

Clicking Noises

Clicking should only be heard when you turn your unit on or off as part of its powering up and down process. But if you hear any continuous clicking or rapid fire clicking, you should check your unit for signs of electrical damage. This is something that can happen to any type of HVAC unit, so you’ll want to get a professional out to help you pinpoint the exact problem.

Squealing or Screeching Noises

Squeals and screeches are painful to the ear and aren’t great for your HVAC. This is usually a sign that something is misaligned in your unit, and you are experiencing motor issues as a result. This could also indicate that your unit has built up too much pressure and your sensor is not working well enough to tell your unit to shut off.

Gurgling Noises

Gurgling noise related issues are easier to identity because it is usually associate with a water problem. Hearing gurgling and bubbling or seeing dripping water is not a good sign. This could mean your unit has leaks or that something is clogged.

If you are hearing strange sounds coming from any of your HVAC units, we can help!  Our team at Shriver Mechanical can handle any HVAC project you throw our way. Contact us or call us today at (770) 975-1927 to schedule an appointment.