Cleaning your furnace at least once a year is advised, ideally, before the heating season begins in the fall. Regular furnace maintenance, including cleaning, contributes to peak performance, energy efficiency, and safety. Dust, debris, and grime can build up on components such as burners, heat exchangers, and air filters, thereby reducing efficiency and creating additional wear. A clean furnace runs more efficiently, consuming less energy and avoiding potential problems. However, if you observe significant dust buildup or decreased efficiency, you may need to clean more frequently. For precise cleaning instructions appropriate to your system, see your furnace's manual or a skilled HVAC expert.