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An HVAC cooling tower is used for disposing or rejecting heat from chillers. Air cooled chillers are less effecient than water cooled chillers due to rejection of heat from tower water near wet-bulb temperatures.
Most HVAC systems remove heat from your home using a device called a cooling tower. Cooling towers are placed outside the building, either on the roof or adjacent to the building, but they work on essentially the same principles as the massive industrial cooling towers used to remove waste heat from petrochemical refineries and nuclear power plants.