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Desirable combination of weather temperature, relative humidity, air movement and mean radiant temperature, present a certain zone which provides thermal comfort for the majority of people. One of the most important issues, which should be considered before building a construction, is the accurate estimation of the thermal comfort within the designed building. Thus, evaluation of thermal condition of a building in design stage will cause an opportunity to change and modify design elements and materials. In this paper, an attempt has been made to discuss about effective parameters that influence human physical comfort and then four different procedures have been presented to predicting thermal comfort zone.