The answer to 'when to service preventive maintenance' is that HVAC systems should undergo regular preventive maintenance at least once a year, typically in the spring or fall before the peak heating or cooling seasons. This helps ensure your system is running efficiently and can catch any potential issues before they become major problems.
During a preventive maintenance visit, an HVAC technician will thoroughly inspect your system, clean and calibrate components, check for wear and tear, and make any necessary adjustments or minor repairs. They may also recommend replacing air filters, cleaning coils, or other maintenance tasks to keep your system in top shape.