The air conditioner is a device that produces or maintains a consistent room temperature. From an air conditioner is when the plant is able to do so, to cool the air to be treated and warm. This kind of plants are called partial air conditioning. Air conditioning is also in a position to influence, the humidity, so too dry or too wet, it is called an air-conditioning system. Abroad, such as air conditioners in America can only be understood as a space cooling. In Germany, air conditioning, according to regulation, the humidity, temperature and improve air quality rules, or hold. An air temperature can be controlled centrally by the outside temperature. But one can also construct a single-room control, but this is expensive.

The type of air conditioning is very different. There are two types. First, there is the direct expansion and, second, the cold water or brine cooling, indirect cooling. Direct expansion work without a medium such as chilled water or brine. The cooling is done directly by the evaporation of a refrigerant. The refrigerant removes heat from the air. With a large air conditioning needed to cool large quantities of air, an indirect cooling is used. Here is a chiller water or brine (salt solution) is cooled. This cold water or brine is then distributed by pumps and control valves on each tab of the systems. In a register the cold water is pumped through coils and reroute the air to be cooled to such coils. The air giving off their heat to the cold water and is cooled thereby.

The air conditioning unit or a split direct expansion is used in domestic applications. This is to split units or Monoblockgeräte. A Monoblockgerät has an air hose, like a dryer for laundry. This exhaust hose must lead to the outside. This means that must be broken either in the wall of a hole or he depends so from an open window. This form of air conditioning is relatively noisy, because the compressor operates in the apartment. The split unit actually has two parts, one indoor and one outdoor unit. In the outdoor unit is the compressor and the evaporator in the indoor unit. The devices are equipped with two hoses connected to each other. The most modern vehicles have also been conditioned. This is referred to as either air conditioning or climate control. New devices are controlled electronically, the old equipment is mechanically or controlled by a knob. An air conditioner in the car is also a small split device.

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