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The function of the economizer is, as its name implies, to “economize,” or save on cooling costs. Obviously, it costs money to operate the compressor. If the compressor can be shut down and the system still provides adequate cooling, energy savings can be realized. Whenever the HVAC system is calling for cooling and the temperature outside is cool enough, it is economical to shut off the compressor and bring in cool outside air to satisfy the cooling needs of the building. Such is the function of an air economizer system.