If your business has air-conditioned offices or carries out a manufacturing process that uses water as a coolant, it may have a cooling tower. Cooling towers remove heat from circulating cooling water systems, so that the water can be recirculated. The heat removed from the water is released to the atmosphere.
Most large buildings with offices, classrooms, lecture theatres or laboratories have systems that control the heating and cooling of air in the building. Sports facilities and swimming pools also use these systems. Many of these systems have cooling towers or heat exchangers which are often situated on the roof of the building.