The now-chilled water is then sent to the water tank via the primary supply, where it is distributed to the varios climate-controlled spaces by the water pump. Because heat always moves from hot to cold as stated by the second law of thermodynamics, the chilled water absorbs the conditioned space's ambient heat in the air handler. A fan then forces the cooled air into the space via the ductwork. The warmer water is then returned to the chiller to be cooled once again