Which of the following describes a key function of HVAC maintenance?

A key function of HVAC maintenance is to extend the system's lifespan and performance. Regular maintenance tasks, such as cleaning components, checking refrigerant levels, and ensuring proper operation, help to identify and address issues before they lead to significant failures. By keeping the equipment in good working condition, maintenance ensures the system operates efficiently, which not only prolongs its life but also maintains optimal performance levels. This routine care can prevent costly repairs and improve energy efficiency, leading to lower operating costs for the building overall. Therefore, maintaining HVAC systems is crucial for ensuring reliability and longevity.