Which component is typically not required to be serviced annually?

The choice indicating that compressors typically do not require annual servicing is aligned with common practices in HVAC maintenance. Compressors are often designed for long-term durability and reliability, with most issues arising from improper usage or external factors rather than from the compressor itself needing routine maintenance.

In contrast, components like expansion valves, condenser coils, and air filters are more frequently subjected to wear and degradation due to their direct involvement in the system's ongoing operation. Expansion valves can experience clogging or malfunction due to refrigerant contamination, condenser coils accumulate dirt and debris that can hinder performance, and air filters require regular replacement or cleaning to ensure optimal airflow and system efficiency.

By focusing on the compressor's function and longevity, it's understood that while monitoring and occasional checks are necessary, they do not typically require the routine annual servicing that is essential for the other components.