What is air conditioning?

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Air conditioning is a device that adjusts air, most often cooling. The basic part of the air conditioning system is an air-conditioning circuit, the sense of which is the same in the air conditioning as the cooling circuit used for the refrigerator. Air conditioning is mainly used in hospitals, shopping centers, laboratories, or industrial halls. The air-conditioned households are not very well with us. Air conditioning operation is very expensive. In the rich countries near the equator, these devices are as widespread as our television. Air conditioning is also very popular in the USA.