Under conditions for which the same room temperature is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the winter but comfortable in the summer. provide a plausible explanation for this situation (with supporting calculations) by considering a room whose air temperature is maintained at 20c throughout the year, while the walls of the room are nominally at 27c and 14c in the summer and winter, respectively. the exposed surface of a person in the room may be assumed to be at a temperature of 32c throughout the year and to have an emissivity of 0.90. the coefficient associated with heat transfer by natural convection between the person and the room air is approximately 2 w/m2 k.