Global warming is increasing day by day. People are now interested in artificial cooling systems AC to survive this heat. The air conditioner can be used to cool the house and purify the polluted air coming from outside. That is to say, air conditioning is the technique of creating a comfortable environment in a confined room or place with the help of steam mixed air, humidity, temperature control, cleaning of dust and sand, disinfection, and exchange of air.
Of course, people use AC to survive the heat, but the purpose of making AC was not at all. The AC was originally planned to store food and control the temperature of the printing press. Foods kept at room temperature are easily spoiled due to bacterial infections. However, below 4 সেল C, bacterial growth slows down. So in the beginning, air conditioning is based on the need to preserve food from bacteria.

The first name to come up in the discussion as the father of the modern AC is Haviland Carrier, an American engineer. In 1902, Willis Haviland invented the first electric air conditioner of his career. That AC was originally designed for industrial use.

Havilland worked in a printing press. Due to the humidity and temperature of the air there, it was not possible to work properly. This device was originally designed to increase production. The use of AC was introduced to control the humidity and temperature of the air and to keep the size of the printed paper and the proper use of ink. In 1906 he received a patent from the US government for AC.
Earlier, the discovery of the refrigeration principle in 1824 led to the discovery of a method of cooling the air by evaporation of liquid ammonia. In 1840, physicist and physician John Garry proposed the idea of ​​cooling the cities of Florida to save city dwellers from high temperatures. According to him, this cooling method may be the only solution to cure various diseases like malaria.

Following the artificial cooling system, John Garry built a refrigerator using a compressor, but he failed to obtain a patent. Artificial cooling was discontinued for several years before the invention of the Willis Havilland carrier air conditioning.

In 1915, Career Engineering Corporation, the world’s largest AC manufacturer, was founded by Carrier and six engineers. The use of AC in residential houses started in 1926. At that time toxic gases like ammonia, propane, and methyl chloride were used in AC.

In 1928, Thomas Migley Jr. invented the Freon AC, a safe AC for people in residential, industrial, and commercial occupations. In 1930, the White House was air-conditioned.
But the AC invented by the carrier was so huge that a house was needed to keep it. As a result, this AC could not be used without big factories. Later, in 1945, Robert Sherman invented the portable AC, which could be used by the window. This AC filtered the air in the house as well as kept the house cool on hot days and warm on winter days. Haviland Carrier died on October 8, 1950. In 1979, United Technologies of America bought Career Engineering.