Cooling apparatus refers to any equipment or device used to reduce the temperature of a certain object or space. There are several synonyms for this term, including cooling system, cooling unit, chiller, air conditioning, refrigeration, cooling tower and heat exchanger. A cooling system or cooling unit is a specific type of device that is designed to remove heat from a certain area using fluid, gases or other cooling agents. A chiller is a device that uses chilled water or air to cool a certain area. Air conditioning and refrigeration are commonly used in buildings and vehicles to regulate temperatures. Cooling towers and heat exchangers are specialized types of cooling apparatus primarily used in industrial settings.