A temperature-sensing element for the air in a conditioned space is located close to an exterior wall. The wall is poorly insulated such that the inside surface becomes quite cold in the winter. In the northern city locale it may be as low as 0?C. The walls of the room behave nearly like a black surface and the thermometer has ? = 0.9 and a convection heat-transfer coefficient of 14 W/m2 · ?C. When the thermometer reads 28?C, what will be the true air temperature?