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No matter how old your HVAC system is in your Sand Key, Florida, home, it can develop unexpected issues. A healthy unit should operate quietly, so if you notice any unusual sounds coming from your HVAC system, it’s time to take action.

Rattling or Banging

Any type of rattling, banging, clanking, or thumping sound usually indicates problems with the HVAC system’s motor or blower assembly. Sometimes, the assembly’s motor mounts loosen up and the blower becomes aligned. Initially, these sounds may alert you to a growing problem, but if they get louder, you could be dealing with broken or disconnected parts inside the system. At worst, the HVAC will shut itself off, leaving you without heat or air.

Repeated Clicking

Clicking sounds are normal when you turn your unit off and on, but when the clicking repeats, you may have a defective relay. Repeated clicking can also indicate an issue with an electrical control, which causes the relay to fail.

Screeching or Squealing

A blower motor that screeches or squeals is in desperate need of repair. These sounds tend to indicate problems with the motor bearing or belt. A belt replacement is an inexpensive cost, but you must replace it before it breaks. Otherwise, the blower won’t run. If the belt is fine and you still have screeching or squealing noises, the system may simply need fresh lubricant. Schedule your HVAC service appointment to have a technician handle it for you.


Fast thwapping sounds often resemble playing cards caught in bicycle spokes. When you hear thwapping, it’s likely an issue with the blower blades, as things can get stuck inside the housing and contact the blades. This type of noise isn’t always critical, but if the stuck object is creating resistance inside the unit, it may cause abnormally fast wear and tear.

Don’t take unusual HVAC noises lightly. Call Advanced Cooling Systems at (727) 213-5888 to schedule a residential HVAC maintenance appointment.

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