Furnace Making Noise: Record It Without Opening
If you smell gas or a CO alarm sounds, leave the home and call the gas utility or 911 from outside. For a new loud furnace noise without those warning signs, note when it occurs and where it comes from. Turn off an unusually loud system and arrange a professional inspection.
Talk to a contractor about the noise from your furnace
Call (877) 565-3062One call reaches a contractor registered for your ZIP; ask the fee and the arrival window.
HVAC Responder Editorial Team · Reviewed 2026-11-01 · Facts quoted from manufacturer documentation
What the source supports
According to Is This Normal? HVAC Smells and Sounds, Explained - Trane:
A furnace shouldn’t make any loud noises. When it’s running at full capacity, you may hear it more than when it’s running at a lower capacity.
Discuss the noise from your furnace with a contractor
Call (877) 565-3062One call reaches a contractor registered for your ZIP; ask the fee and the arrival window.
Safe observations before the service call
Record the sound from a safe distance after any gas or CO hazard has been addressed.
Details to give the contractor
Separate a noise at startup from one that persists during a run or appears only at shutdown. Include whether airflow or room temperature changed at the same time.
Gas smell and carbon monoxide alarms
According to CPSC Carbon Monoxide Fact Sheet:
Immediately move outside to fresh air.
Related symptoms and code references
- Furnace Not Turning On: Checks Before Calling
- Furnace Blowing Cold Air: Fan or Heating Failure?
- Furnace Short Cycling: Repeated Starts and Stops
- Carrier furnace codes
- Goodman furnace codes
- Lennox furnace codes
- Rheem furnace codes
- Trane furnace codes
- York furnace codes
- Furnace cold-air guide
- All HVAC problem pages
What happens when you call about the noise from your furnace
- Your call routes to an independent local contractor registered for your ZIP code.
- Ask the fee and the arrival window.
- The decision to hire stays with you.
One call reaches a contractor registered for your ZIP; ask the fee and the arrival window.
Sources and review date
- Is This Normal? HVAC Smells and Sounds, Explained - Trane · Read 2026-11-01
- CPSC Carbon Monoxide Fact Sheet · Read 2026-11-01