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Air Conditioning Changes

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In 1900 there was very little people could do during a hot spell except grumble about the weather or -if they could afford it -go away to the mountains or the seashore. Today air conditioning has changed this. With air conditioning has changed this. With air conditioning you can be comfortable anywhere indoors on even the hottest, stickiest day of the year. You will almost certainly find air conditioning in the movie theaters you attend, in many of the stores where your family shops, and in the restaurants where you eat. It may even be in your own home.

What is air conditioning?
You know that air conditioning makes you feel cool. But air conditioning is more than just cooling. It means keeping the temperature and humidity (moisture content) …show more content…

Carrier who built is often called "the father of air conditioning." Carrier built this machine for a printing plant in Brooklyn, New York, that had trouble printing in color. Paper stretches when the air is damp and shrinks when the air is dry. Since each color had to be printed separately, printing of different colors on the same sheet of paper did not line up accurately because the papers change size between printings. Carrier's machine kept the moisture level of the air constant by drawing the air over a row cold pipes that condensed excess moisture. This kept the paper at one size and also made the people in the plant feel cool. Carrier's invention marked the begin of scientific air conditioning.

Air conditioning was soon being used in many factories, such as plants that made ammunition during World War I. But people generally did nit know about this invention until 1920's, when hundreds of movie theaters, department stores, and restaurants had air conditioners installed. People often came into these places just to get relief from hot, muggy air …show more content…

Otherwise people would have to turn their units off and on continually as the temperature become too cold or hot. A steady temperature-regulating device called thermostat. The thermostat is set at desired temperature. It then switches the cooling unit on and off as needed.

The air conditioning systems of the future may work by what is known as thermoelectric. A thermoelectric unit is very small and very quiet. It is made up of tiny "couples," each couple consisting of a pair of semiconductors and connected in parallel current. These couples produce cooling at one end and heating at other when direct flows through them. This is called Peatier effect. When the current is reversed, the cooling and heating effects also reverse. When a way is found to produce this tiny thermoelectric unit cheaply, they may cool and heat your whole house.

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