What system component is typically checked during HVAC maintenance to ensure efficiency?

Refrigerant levels are a critical area to check during HVAC maintenance because the efficiency of the system largely depends on having the correct amount of refrigerant. If the refrigerant levels are low, the system will struggle to absorb and transfer heat effectively, leading to reduced cooling or heating performance. Additionally, incorrect refrigerant levels can cause the compressor to work harder, which can lead to increased energy usage and potential damage to the system over time. Therefore, ensuring that refrigerant levels are within the manufacturer's specified range is essential for optimal system efficiency and longevity.

Checking other components like heat exchangers, coil fins, and air ducts is also important for maintaining the overall effectiveness of the HVAC system, but achieving correct refrigerant levels is fundamental to the system’s performance.