Abstract: A control system for the control of temperature within a building is provided to affect both cooling and heating of the building as required during the winter season with a minimum energy input to the building. Heat transfer is provided between the more interior areas of the building and the more exterior areas of the building so that heat generated in the more interior portions of the building is not entirely wasted by being exhausted directly to the cold outdoors. Chilled water refrigeration equipment, standard forced air systems and outdoor air are utilized to affect the desired heating, cooling and heat transfer within the building.