Preventative HVAC maintenance typically involves tasks like cleaning and replacing air filters, lubricating moving parts, inspecting and cleaning coils, testing safety controls, examining electrical components, and scrutinizing the blower assembly. The program also encompasses ductwork inspections, checks for refrigerant levels, and assessments of the system's overall operation. These measures aim to detect and address potential issues before they escalate, ensuring optimal performance and preventing unexpected breakdowns in the HVAC system. Regular professional checkups contribute to the durability and reliability of HVAC systems, maintaining their efficiency through routine evaluations by experts.