In keeping with Western Michigan University's policy to meet Leadership in Energy and Environmental Design silver standards for all newly constructed buildings on campus, WMU has selected its Health and Human Services Building, constructed in 2005, as a test facility for technologies that meet American Society of Heating, Refrigerating and Air Conditioning Engineers 62.1-2004 standards for indoor air quality. WMU is committed to the overall health and well being of the students, faculty, staff and visitors who use our facilities. One of the technologies in use at the Health and Human Services Building to maintain indoor air quality are active carbon dioxide sensors in each room throughout the building. These sensors monitor the buildup of carbon dioxide where large groups of people congregate, such as classrooms. When these sensors are triggered, the building automation system instructs the heating,ventilating and air conditioning system to allow outside air to be circulated maintaining indoor air quality. WMU is currently using an economizer strategy that minimizes the cost impact of ventilating with outside air while maximizing the quality of the air inside the building.