Furnace or vents emit a burning dust smell at the beginning of the heating season.

Safety: A light burning dust smell for the first few cycles of the season is common. If you smell strong burning plastic, electrical, or see smoke, shut off the furnace and investigate.

Steps to check:

• Run furnace: Allow the furnace to run for 30–60 minutes with a window slightly open to clear the smell.
• Replace filter: Install a new air filter to capture additional dust.
• Inspect for other odors: If the smell is chemical, plastic, or electrical, turn off power and call a technician to inspect wiring and components.
• Consider duct cleaning: If dust smell persists, have ducts inspected and cleaned if necessary.