As the atmospheric conditions vary, there is a need to condition the air to suit the need of the occupants. This is done by the process of air-conditioning the air so as to simultaneously control temperature, humidity and movement of the air with due control on distribution and cleanliness. This requirement of occupants of a building has to be satisfied both during summer and winter seasons.

Difference in temperature in various parts of the building and inside-outside temperatures result in a transfer of heat from the warm area to the cool area. Such a variation in temperature causes discomfort to the occupants. It is appropriate to maintain almost a constant temperature in all parts of the building ...

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