Regardless of how new or old your HVAC system is in Crestwood, Missouri, it can develop problems. A functioning HVAC system is relatively quiet. If you suddenly notice unusual noises coming from your HVAC unit, this can be a definite sign your technician needs to inspect it.

Banging, Clanking, or Thumping

All of these sounds usually indicate a blower assembly or motor problem. Rattling often means a system component is coming loose. Call in a technician to check and repair the problem before the part breaks completely.

If you hear a loud banging noise when the blower is running, turn the system off immediately; something is probably broken or disconnected. At times, the motor mounts on the assembly come loose, or the blower may be out of alignment.

Humming and Hissing

Low pitched hissing can indicate air duct leakage, while loose piping or other loose parts can cause a humming noise.


If you hear a rattling sound when you turn on your compressor and the fans start, there could be loose components or a failing motor. The louder the sound, the more serious or worse the problem could be.

If the noise starts to resemble a scream, your compressor may be failing. Call in your HVAC technician and have it checked out.

Screeching or Squealing

The sound of metal against metal causes a screeching sound. It indicates that the fan motor bearings are wearing out. A squealing sound may indicate an issue with the fan belt or motor bearings. Your blower motor unit may squeal when it needs lubricant, while a serious grinding noise could warn you a bearing is about to fail.

Never take unusual HVAC noises lightly, no matter the sound. Call our professional team at C & G Heating & Cooling at (314) 254-9196 to learn more about our HVAC services.

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