Furnace Making Noise in Chicago
The useful first step is identifying the sound and when it happens.
Listen for the pattern
Banging or booming
Especially important if it happens around ignition.
Rattling
Can be as simple as a loose exterior panel, but persistent rattling deserves attention.
Buzzing, squealing or grinding
New mechanical or electrical-sounding noises are a reason to stop guessing and request a check.
Before you call
Check the filter and thermostat, and write down whether the sound happens at startup, while heating, or during shutdown. That information can make the service request more useful.
Common questions
Should I ignore a new furnace noise?
A new or worsening furnace noise is worth paying attention to. A loose panel may rattle, while repeated banging, grinding, buzzing or squealing can point to a problem that deserves inspection.
What should I check before requesting help for a furnace noise?
Note when the sound happens, where it seems to come from, whether heat is still working, and whether the filter is dirty. Do not remove safety panels or reach into moving or electrical components.