Abstract: An air conditioning system comprising a chamber with a heated air space at a first temperature; a heat sink located in proximity to the chamber, the heat sink being provided with cooled media at a second temperature lower than the first temperature; a plastic heat exchanger located within the chamber with an associated fan for the movement of air within the chamber across the heat exchanger; and a plurality of plastic lines coupling the heat exchanger and the cooled media, the lines including a first line to convey water from the heat exchanger in the chamber to the cooled media and a second line to convey water from the cooled media to the heat exchanger in the chamber with an associated pump to effect the flow of water in a closed loop configuration between the cooled media and the heat exchanger whereby the heated chamber air space will be cooled to a lower temperature from the cooled water from the cooled media while the temperature of the cooled media will be heated to a higher temperature from the heate