Is 407C compatible with R22

407C is a refrigerant that is often used as a replacement for R22, particularly in systems designed for R22. While it is compatible in terms of functioning within the same system, it is important to note that 407C operates at slightly different pressures and requires a different oil type (POE oil instead of mineral oil). Therefore, a system designed for R22 may need some modifications to ensure optimal performance with 407C. Always consult a professional before making any changes to refrigerant types in HVAC systems.