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Hello. My name is ***** ***** I'll do my best to help. Let's get started and see what we can do.If the evaporator can be converted to or is already using the new R410A refrigerant, I would just replace outdoor unit. If evaporator is a dedicated R22 coil, I would bite the bullet , count your losses and replace both coil and outdoor unit with the new R410A equipment. Otherwise you are asking for more expenses down the road.I do not see need to replace furnace.