R-410A is a blend refrigerant developed as a substitute for HCFC-22. It is a mixture of HFC-32 and HFC-125, and is a pseudo-azeotropic refrigerant. It requires liquid filling to prevent change in composition. Its level of pressure is approximately 1.6 times higher than that of HCFC-22, achieving excellent heatpump performance. It is highly compatible with ester oil and ether oil (It is not compatible with mineral oils like naphthenic oil etc. which is normally used with HCFC-22). Its moisture solubility is slightly higher than that of HCFC-22.