A heating system should be serviced at least once a year. Annual maintenance should be arranged prior to the start of the heating season, which is usually in the fall, to ensure the best performance and efficiency. Regular servicing helps to identify and resolve potential problems, ensures optimum combustion, improves energy efficiency, and extends the system's lifespan. However, if your heating equipment, such as a heat pump, is used for both heating and cooling all year, it is recommended to schedule maintenance twice a year, before the heating and cooling seasons.