Furnace Making Noise: Causes + When to Call

Your furnace shouldn't sound like a construction site. Common noises like 'banging' often point to delayed ignition—a dangerous build-up of gas that needs immediate attention. 'Whistling' usually indicates restricted airflow, likely from a severely clogged filter or undersized ductwork. 'Screeching' or 'squealing' is almost always a sign of a failing blower motor or bearing. If you hear metal-on-metal grinding, turn the system off immediately to prevent catastrophic damage. Our techs in Lebanon specialize in 'noise-hunting' to catch small failures before they leave you without heat during a freeze.