Patent ID: 8146373

Claim:
A method for improving the efficiency of an air conditioning system utilizing a condensable refrigerant in a vapor-compression refrigeration cycle having a condenser unit and a separate air handler unit connected in serial flow refrigerant circuitry, said condenser unit including a compressor, a condensing coil, and a fan to generate an air flow through said condensing coil to disperse heat generated by the system, wherein said method comprises: mounting an accessory sub-cooling unit to an exterior surface of said condenser unit, said accessory sub-cooling unit comprising a serpentine heat exchange tube having an inlet and an outlet, fluidly connecting the inlet of said accessory sub-cooling unit to an outlet of said condensing coil fluidly connecting the outlet of said accessory sub-cooling unit to a conduit fluidly connected to said air handler unit, positioning said accessory sub-cooling unit relative to said condensing coil so as to utilize an existing air flow generated across said condensing coil by said fan to lower the temperature of said condensable refrigerant as it passes through said accessory sub-cooling unit.