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How to choose an AC

An air conditioner is no longer a luxury, but has become a necessity . An air conditioner does not provide cooling only ; it truly “conditions” the air by dehumidifying (removing humidity) and filtering (removing dust, pollen, germs) it, thereby leading to more comfortable and healthy living. However , there are many things to be considered before you buy the air conditioner best suited for your needs. 1. Type – Air conditioners can be of two main types – central and room. While central air conditioners are located in one part of the house but cool the entire building, room air conditioners operate in individual rooms. Central air conditioners are expensive but provide the best value for money if several rooms are to be cooled. However , the existing duct work should support central air conditioning. Hence, such buildings are designed in that manner before construction. Room air conditioner can be of three main types – > Window models – installed in most windows. > Casement window models – installed in narrow, vertical windows. > Built-in models – installed in a sleeve on the wall. 2. Size – The size of an air conditioner refers to the cooling capacity . You should select the air conditioner of the appropriate size depending on the room size and prevailing climate. Too large an unit will repeatedly shut down to maintain the pre-set temperature, resulting in higher power consumption and inefficient dehumidification. Too small an unit will overheat but still not be able to cool efficiently. An air conditioners cooling capacity is measured in British Thermal Units (BTU), which in turn refers to the amount of heat that will be removed per hour. Air weighs .076 pounds per cubic feet or 34.47 grams per cubic feet at sea level at standard temperature. A 5000 BTU air conditioner will remove 5000 BTU of heat per hour. A “one-ton” air conditioner will remove 12000 BTUs per hour while a two-ton air conditioner will remove 24000 BTU per hour. 3. Energy Efficiency – Once you have decided on air conditioner type and size energy efficiency becomes the deciding factor subject to price limitations. Although a more efficient unit may be priced higher, in the long run it works out cheaper owing to lower running costs. The energy efficiency rating (EER) of an air conditioner is its BTU rating divide by its wattage. For example, if a 10000-BTU air conditioner consumes 1000 watts of power, its EER is 10.0 (10000 BTU/1000 watts). The higher the EER, more efficient the air conditioner. 4. Installation – Without proper installation, even a highly-efficient unit will end up wasting power. All manufacturers instructions must be strictly followed during installation. The unit should also be shielded from direct exposure to the sun as that can decrease efficiency. Also, there should be no obstruction in front of the exhaust outside the building. Room air conditioners must be installed on a flat, even surface so that the internal drainage system and other mechanisms operate properly. Specialized electrical circuits at different voltages may be required to be installed.

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