The answer to 'when to replace preventive maintenance' is that HVAC preventive maintenance should typically be performed annually or every 6-12 months, depending on the system and usage. Regular maintenance helps ensure your HVAC system is running efficiently, extends its lifespan, and prevents major breakdowns. During a preventive maintenance visit, an HVAC technician will inspect, clean, and tune up your system to keep it in good working order.
The frequency of preventive maintenance can vary based on factors like the age of your HVAC system, how often you use it, and the environment it's operating in. Newer systems may only need maintenance once a year, while older systems or those in high-usage environments may require maintenance every 6 months. It's generally a good idea to have a professional HVAC technician inspect and service your system at least once a year, even if it's running well, to catch any potential issues early.