Converting an R-22 system to compatible alternative refrigerant as part of scheduled maintenance. With R-22 production phased out and prices prohibitive, this conversion extends the viable lifespan of the existing equipment by 3-5 years. Process includes evacuating remaining refrigerant, replacing compatible components including expansion valve and filter drier, leak testing system under pressure, evacuating to remove moisture, and charging with R-407C alternative. Also updating system labeling to indicate new refrigerant type and charge specifications. This conversion improves efficiency while providing a more environmentally sustainable solution until full system replacement becomes necessary.