My home has a split A/C system. The condensing unit is outside and the furnace and evap coil is inside the house. The evap coil was replaced on March 2008 with Trane model # 2TXCC049BC3HCAA. I need to replace the condensing unit with a new Trane unit model # 4TRR3048A100A that uses R-410A refrigerant. My existing system uses R-22. My question is: Is it OK to keep the existing evap. coil for R-410A with the new condensing unit? The A/C tech said if adding Thermal Expansion Valve (TXV) to the indoor coil and a suction drier , evacuate the current refrigerant ,clean both coil , the exiting evap.coil will work with r-410A.
The other A/C tech told me I need replace existing Evap.coil to matched with condenser. Who is right?
very much appreciate your opinions: