When your furnace runs continuously without shutting off, it can lead to high energy bills and premature wear on the system. This issue may stem from various causes, including a malfunctioning thermostat, a dirty air filter restricting airflow, or blocked vents preventing proper heat distribution. If you’re unable to resolve the issue yourself, it’s best to seek professional assistance from an HVAC technician to diagnose and repair the underlying problem, ensuring optimal furnace performance and comfort in your home.