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Can you mix r22 freon with R410a in a heat pump?

Mixing refrigerants of different types is generally not a good idea as it reduces efficiency and can lead to damage to the system. R22 is a hydrochlorofluorocarbon (HCFC) refrigerant and it is not compatible with R410a which is a hydrofluorocarbon (HFC) refrigerant. Mixing refrigerants can also make it difficult to determine the refrigerant charge in the unit, which can impact its performance.