Replace air conditioning condensing unit - Leak check at evaporator coil. Turn off main power at breaker box to condensing unit. Disconnect wires supplying condensing unit with voltage. Recover R22 out of old condensing unit, unsweat welds that connect to unit, loaded old unit on truck and put new condensing unit in place. Reconnect wiring to new condensing unit. Reweld piping to new condensing unit. Perform leak check on welds - no leaks. Perform triple evacuation on unit. Drop charge on unit of 7 lbs, 407C refrigerant. Suction line cold, as well as unit cooling down house.