Common HVAC Problem

HVAC Strange Noises

Your HVAC system is telling you something. Here's what hvac strange noises means, why it happens, and how to fix it.

Signs You're Experiencing This

Banging or popping sounds
Squealing or screeching
Rattling or vibrating
Humming or buzzing
Clicking sounds
Grinding noise

What Causes HVAC Strange Noises

1

Loose components or panels

2

Worn blower belt or bearings

3

Dirty burners (delayed ignition)

4

Refrigerant issues

5

Fan blade damage

6

Motor bearing failure

7

Ductwork expansion/contraction

Try These Before Calling

Safe checks you can do yourself before scheduling a service call.

1
Note when noise occurs (startup, running, shutdown)
2
Identify location (indoor unit, outdoor, ducts)
3
Check for loose vent covers
4
Listen for pattern (constant vs intermittent)

When to Call a Professional

  • Banging from furnace (could be cracked heat exchanger)
  • Screeching that persists
  • Any grinding sound
  • Noise getting progressively worse
  • Noise accompanied by burning smell
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HVAC Strange Noises FAQ

HVAC Strange Noises is commonly caused by: Loose components or panels, Worn blower belt or bearings, Dirty burners (delayed ignition). Other factors include Refrigerant issues and Fan blade damage. A professional diagnosis can pinpoint the exact cause in your system.

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