The most common and cost efficient cooling devices are the Central air con Units. This is composed of indoor and out of doors portions. An air filter, a fan and a cooling coil are parts of the indoor portion. The warm, humid air is drawn through the filter and into the fan then blown over the cooling coil. The cooling coil then cools and humidifies the air before it is blown into the room. The cooling coil contains a refrigerant fluid, which changes its physical property from liquid to gas because heat from the warm air passing over the coil causes its evaporation. Heat from the warm and damp room air is taken thru this process. The outdoor portion of the unit is composed of a compressor, a fan and a condenser. The cooling coil offloads low-temperature and low pressure refrigerant gas to the compressor. The compressor on the other hand delivers high-temperature and hi-pressure refrigerant gas to the condenser. The fan blows outdoor air over the condenser. Within the condenser the high temperature, high pressure refrigerant gas is converted to refrigerant liquid. Heat from the hotter refrigerant gas is taken by the cooler outside air passing over the condenser.

This process causes the refrigerant gas to change to the liquid state. The refrigerant liquid circulates through the closed path leading through the cooling coil, the compressor and the condenser in a constant motion. The comparatively cool outdoor air is sucked by the fan for cooling the condenser and then blows the hotter air back out of doors. In a room air conditioner, electric motors drive the compressor and the 2 fans. 110-volt lines are used for smaller room air conditioning units while for bigger units 220 volt line supplies are used. A complete small residence can be cooled by some room air conditioners with enough capacity.

although Window air-con Units are the lowest-cost cooling device, it has its own disadvantages which include the following :

1. Most room units can supply only widely irregular room air temperature.


2. Most room air conditioners operate with noise.


3. It is difficult to obtain an even distribution of cool air.

because of the known drawbacks of a room air conditioner many folks prefer to use the dearer central cooling system.

A central cooling system is sometimes split into 2 units : An indoor and an outdoor unit. A filter, a fan and a cooling coil represent the indoor unit. The outdoor unit on the other hand is composed of a compressor that's motor-driven, a fan for the condenser and a condenser. A cabinet mounted outdoors houses these elements. Most home cooling systems provide humidity reduction but offer only very limited humidity control. The length of the compressor operation decides the moisture content reduction. For instance, a low indoor humidity value of forty % is reached when the compressor operates continuously for one or two hours in a hot summer day, but as night time approaches and the compressor stops operating, the water drops on the cooling coil tend to evaporate and a jump in the indoor humidity happens. This variable humidity and its limited control are acceptable to home owners who are using the central cooling system.

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