Scheduling routine maintenance ensures optimal efficiency and catches potential issues early. Replace air filters regularly to improve airflow and prevent dust buildup, and keep the area around the furnace clean and free from obstructions. Adjust thermostat settings appropriately to prevent excessive strain on the system. Finally, be aware of unusual sounds or changes in heating performance and promptly seek professional assistance. By staying proactive and attentive, you can extend the lifespan and efficiency of your furnace.