How often should refrigerant charge and oil levels be checked during the system’s lifecycle?

Refrigerant charge and oil levels should be checked regularly during the system’s lifecycle to ensure optimal performance and efficiency. The frequency of checks depends on various factors, including system usage, operating conditions, and manufacturer’s recommendations. As a general rule, refrigerant charge and oil levels should be checked at least annually, or more frequently if the system is subject to heavy usage or extreme operating conditions.