How often should refrigerant charge be checked and optimized in an HVAC system?

Refrigerant charge should be checked and optimized regularly as part of routine HVAC system maintenance. The frequency of checks depends on system usage, age, and manufacturer recommendations. As a general rule, systems that operate continuously or in harsh environments may require more frequent checks, while systems with minimal usage may require less frequent checks. It is recommended to check refrigerant charge at least once a year, or as specified by the manufacturer, to ensure optimal system performance and energy efficiency.