Furnace making loud noises
Banging, booming, squealing, rattling or grinding from the furnace.
What you're probably seeing
Banging, booming, squealing, rattling or grinding from the furnace.
Likely causes
- Banging at startup: delayed ignition.
- Squealing: a worn blower belt or motor bearing.
- Rattling: a loose panel or duct.
Safe checks you can do now
- Note when it happens (startup, running, shutdown).
- Check the panel door is secure.
- Turn it off if you smell burning.
When to call a pro
Loud bangs at startup, grinding, or any burning smell.
General information about common causes, not a diagnosis of your home.
FAQ
Quick answers
Who fixes furnace making loud noises?
A heating and cooling company. Call (844) 511-3573 to connect with an independent local heating and cooling company.
How much does it typically cost?
Furnace repair: $125–$480 (ignitor $100–$250, flame sensor $80–$250, blower motor $300–$900) (HomeGuide 2026 national ranges). Your pro sets the real number after seeing the job.
When should I call?
Loud bangs at startup, grinding, or any burning smell.
Related
More heating & cooling problems
Fix nowPlumbing
Gas smell in the house
A rotten-egg smell near the stove, furnace, water heater or meter.
$45–$150 per hour, plus a $50–$200 service call
Fix nowHeating & Cooling
No heat
The furnace or heat pump won't come on, or the house keeps getting colder.
$125–$480 (ignitor $100–$250, flame sensor $80–$250, blower motor $300–$900)
This weekHeating & Cooling
Furnace blowing cold air
Air comes from the vents but it isn't warm.
$125–$480 (ignitor $100–$250, flame sensor $80–$250, blower motor $300–$900)