Furnace produces a burning dust smell when it first starts for the season.

Safety: A mild burning dust smell at first startup is common. However, if the smell is strong, acrid, or accompanied by smoke, shut off the furnace and investigate.

Steps to check:

• Run furnace: Allow the furnace to run for 15–30 minutes with a few windows slightly open to clear the odor.
• Inspect for smoke: Check supply registers and furnace area for visible smoke or scorching.
• Clean exterior surfaces: Vacuum dust from around the furnace cabinet and nearby surfaces.

When to call a technician: If the smell persists beyond the first few cycles or smells like burning plastic or wiring, have the furnace inspected.