Strange HVAC Noises
PriorityUnusual sounds from heating or cooling equipment indicating potential problems.
HVAC systems have normal operating sounds, but new or unusual noises often indicate problems. Some sounds are minor (loose panel), while others signal imminent failure (grinding bearings). Learning to distinguish urgent sounds helps prioritize service calls. When in doubt, getting a professional opinion prevents minor issues from becoming major repairs.
Symptoms to Look For
Possible Causes
What You Can Check
Before calling for service, try these safe checks that may resolve simple issues:
When to Call a Professional
Grinding, screeching, or banging sounds warrant immediate professional attention as they often indicate failing components. Squealing from motors or unusual compressor sounds need prompt diagnosis to prevent complete failure.
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Prevention Tips
Frequently Asked Questions
What does banging from my furnace mean?
Banging often indicates delayed ignition where gas builds up before igniting, creating a small explosion. This is dangerous and needs immediate professional attention. It can also indicate expanding ductwork, which is less serious.
Is squealing from my AC unit serious?
Usually yes. Squealing typically indicates worn fan motor bearings or belt problems. Continued operation can lead to motor failure. Prompt service is recommended.
Why does my ductwork pop and crack?
Metal ducts expand when heated air flows through and contract when it stops. Some popping is normal. Excessive noise may indicate undersized ducts or inadequate support.
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