The answer to 'when to replace preventive maintenance' is that preventive maintenance for HVAC systems should typically be performed annually, or every 12 months. This involves a professional technician inspecting, cleaning, and tuning up the system to ensure it is running efficiently and safely. Proper preventive maintenance can extend the lifespan of your HVAC equipment and help avoid costly breakdowns.
The specific components that need regular maintenance include the air filter, refrigerant levels, electrical connections, condensate drain, and other key parts. Neglecting this maintenance can lead to decreased energy efficiency, reduced comfort, and a shorter overall lifespan for your HVAC system.