Abstract: A heat exchange assembly for reclaiming heat energy from the refrigerant of an air conditioning system comprises a plurality of tube-in-tube heat-exchange coils each adapted to receive the refrigerant and the flow of water through respective tubes in counterflow for heat exchange therebetween. Inlet and outlet manifold pipes connect the coils to the refrigerant circulation circuit and said manifold pipes have graduations of internal cross-sectional area to ensure substantially equal rates of flow of refrigerant through each coil.