The Ultimate Guide to Diagnosing Air Handler Noises

The Ultimate Guide to Diagnosing Air Handler Noises

Clanks, hiss, whirs — the soundtrack of your air conditioning and heating system is a noisy symphony that you wish you could understand better. For homeowners, the mysterious sounds emitting from your air handler can signal something gone awry. A professional air handler repair might be necessary in some cases, but before you call for help, follow this guide to diagnose the noises and figure out what’s going on.


Rattling sounds are often caused by loose parts within the air handler. This could be anything from screws, bolts, or even a fan blade that has come loose. These types of noises can also indicate an issue with the blower wheel or motor. If you hear rattling from your air handler, it’s important to address it promptly before further damage occurs.


Clicking sounds are typically indicative of an electrical issue within the air handler. This could be a loose wire, faulty relay switch, or malfunctioning control board. It’s important to have a professional electrician or HVAC technician diagnose and fix the issue to prevent any potential hazards.


A leak in the air ducts usually causes hissing noises. This can occur due to wear and tear, improper installation, or damage from pests. If you hear hissing coming from your air handler, addressing it as soon as possible is important to prevent energy loss and potential health hazards from contaminated air.


Humming sounds can indicate an issue with the motor or fan blades. It’s important to address this noise promptly, as it can lead to further damage if left unchecked.

Preventing Air Handler Noises

Regular maintenance and upkeep are the best ways to prevent air handler noises. Schedule annual HVAC inspections and tune-ups to catch potential issues before they become costly repairs. Keep the area around your air handler clean and debris-free, and replace air filters regularly to ensure proper airflow.

In addition, proper installation of your air handler is crucial in preventing future noises. Always hire a professional HVAC technician to install or repair your air handling unit.

Understanding and diagnosing air handler noises can save you time, money, and hassle in the long run. By following this guide, you’ll be able to effectively identify and address any potential issues with your air handler. Always prioritize safety and consult a professional if you are unsure or uncomfortable with DIY repairs.