Unexpected noise coming from your AC unit can be concerning. In addition to disturbing your peace and quiet, it may also signify a problem somewhere in your system. Knowing the source of the racket can help you to identify and resolve the issue quickly with the help of an HVAC service professional. Here are the common causes behind three distinct noises.

What It Means When Your AC Makes Noise

1. Scraping

If you hear a scraping noise when your air conditioner turns on, it could indicate a loose blower wheel. When this essential component becomes unattached, it can scrape against the casing, creating the irritating sound.

Scraping noises can also indicate a broken motor mount, so report the issue to an HVAC professional at your earliest convenience. The blower wheel may need to be tightened or replaced. 

2. Popping or Banging

As heated or cooled air moves through the home and the system turns on and off throughout the day, the ductwork in your home can expand and contract. As a result, the metal can dent in and out slightly, creating a popping sound—or even banging noises when larger metal sheets move.

These noises are not usually serious but may need to be addressed if your ductwork has developed any leaks. Up to 30% of a home’s conditioned air may escape through leaky ducts, leading to reduced efficiency and higher utility bills.

3. Rattling 

If you hear a rattling noise whenever your air turns on, it could indicate loose components inside your air vents. Kids and pets could drop small toys or objects into open air registers, where the airflow will make them shake. 

Air registers, which cover up the exit points of the ductwork, are typically made of metal and contain moving parts to direct the flow of air, and these components can break if the registers are stepped on, adjusted improperly, or dropped. To resolve these issues, HVAC service professionals can replace damaged registers or clean out the debris.

If you have questions or concerns about your air conditioning or heating, call Living Comfort HVAC for help. As professionals with more than 40 years of experience in the Cincinnati and Dayton, OH, areas, they’ll quickly and efficiently pinpoint the source of problems and work toward a solution that fits your timeline and budget. Learn more about how they can help you by visiting their website or give their office a call at (513) 833-3876 to schedule an HVAC service call.