The answer to 'when to service furnace repair' is that you should have your furnace serviced and inspected by a professional HVAC technician at least once a year, typically in the fall before the heating season begins. Regular maintenance helps ensure your furnace is operating safely and efficiently, and can catch any potential issues before they become major problems.
During a furnace tune-up, the technician will clean and inspect the components, check for proper airflow, test safety controls, and make any necessary adjustments or minor repairs. This helps extend the lifespan of your furnace and can also improve its energy efficiency, potentially saving you money on your utility bills.