This project is an efficient tool which will be useful for modeling the human thermal responses in moderate, hot and cold environments while wearing different kinds of clothing. Computer Simulator (CS) is derived from the class of multicompartmental thermal models and implemented in an object-oriented approach. It is performed in Borland C++ Builder 6. The mathematical description involves a detailed presentation of the human thermal processes through body division into compartments taking into consideration heat production in organs and tissues, heat transfer by blood flows, conduction, convection, radiation, and evaporation from the skin and the respiratory system, the afferent and efferent thermoregulatory processes. Our model can simulate the non uniformity of the thermal environment, physical activity and effects of various clothing ensembles.