Basically when one hears about air conditioning, it always boils down to being all about cooling down a certain room temperature, making it cold for everyone inside that certain room. Technically, room air conditioning is basically all about controlling and manipulating the room temperature by all means that would then consist of ventilating, heating, and cooling. It is called HVAC in construction terms.
The first air conditioning system was initially used in a specific stock exchange building and was used in the early 1900s. Later in the 1900s, the first electrically-run air conditioning unit was installed and used at a certain printing plant. The unit was not only responsible of cooling the air but also on controlling the humidity.
Manufacturing facilities back then had a difficulty with regards to becoming conducive for working and having productive workers due to the intense heat and humidity in their manufacturing sites, which was why these air conditioning units were primarily used by them to increase their productivity as a whole. It was only in the late 1950s when private civilians started using air conditioning units in their homes and cars as well so as to become more convenient and comfortable.
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An air conditioning unit basically has this system called a refrigerant which allows the temperature of a certain room less hotter. The refrigerants for air conditioning units used back then had some harmful substances put in them that can make the air cooler and fresher. These harmful chemicals were then eventually replaced by a new one called a freon, that still has the ability to make a room cooler.
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Human being can basically trust the fact that freon does not have the ability to harm them in any way possible. But unfortunately, freon can be very harmful for the environment. If one releases freon into the environment, there is this certain chlorofluorocarbon gas that is emitted to the ozone layer, making it thinner, thus causing more heat from the sun to the surface of the earth. A lot of air conditioning units still use the same type of gas even up until today, to help manipulate the temperature of the air, causing it to become cooler and more refreshing. It has been said and believed that environmentalists and nature lovers alike will have to wait until a certain period until manufacturers will be able to replace these harmful and dangerous gases and finally use something that can cool down the temperature, decrease humidity, make our lives convenient, as well as take good care of the other natural forms found on earth.
There are a number of refrigeration cycles that an air conditioning unit will have to go through to manipulate the temperature of the air. The first type of refrigeration process is through the use of a heat pump that is responsible for shooing out hot air that causes heat and humidity, letting the compressor in the air conditioning unit blow in cooler air to lessen the hotness in the room. The second type basically involves the mere pumping of a refrigerant.