I turned on my heater for the first time this season and it smells like something is burning. Should I be worried?
A burning smell when first turning on the heater after months of disuse is usually normal and not dangerous. During the off-season, dust settles on the heat exchanger, burners, and heating elements. When you first turn on the heat, this dust burns off and creates a burning smell that can last 30 minutes to a few hours. Open some windows for ventilation and let it run. The smell should dissipate within a few hours of operation. However, be alert for signs that something is genuinely wrong: if the smell persists beyond 24 hours, if it smells like burning plastic or rubber specifically (not just dusty burning), if you see smoke coming from the vents, or if your carbon monoxide detector goes off. A persistent burning plastic smell could indicate a foreign object near the heat exchanger or a wiring issue. To minimize the burning dust smell, replace the furnace filter before the first use each season and consider running the furnace for 15 to 20 minutes with windows open before you need it for actual heating. Have your furnace professionally inspected once a year in early fall.
