How often should refrigerant charge verification be performed?

Refrigerant charge verification should be performed regularly to ensure optimal system operation and prevent issues like undercharge or overcharge. The frequency of verification depends on factors like system type, usage, and environmental conditions. As a general rule, systems that operate continuously or in harsh environments may require more frequent verification, while systems with low usage or in mild environments may require less frequent verification. It is recommended to perform refrigerant charge verification at least annually, or as specified by the manufacturer or local regulations.