What type of maintenance is crucial for ensuring HVAC efficiency?

Regular filter replacement and cleaning is essential for maintaining HVAC efficiency because filters play a critical role in the airflow and overall performance of the system. When filters become dirty or clogged, they restrict airflow, forcing the HVAC system to work harder to circulate air throughout the space. This increased effort can lead to higher energy consumption, reduced efficiency, and potential overheating of components.

In addition, maintaining clean filters helps to improve indoor air quality by trapping dust, allergens, and other particles that can circulate in the air. This is particularly important for the health and comfort of occupants. By regularly replacing and cleaning filters, HVAC systems can operate smoothly, ensuring optimal performance and extending the lifespan of the equipment.

While other options such as visual inspections and annual refrigerant testing may also contribute to maintenance, they do not address the immediate and significant impact that clean filters have on an HVAC system's efficiency and operation. Therefore, prioritizing regular filter maintenance directly affects both the efficiency and longevity of HVAC systems.