Abstract: A facility providing systems and methods for demand control ventilation for a building, or a portion/portions thereof, using a combination of scheduling and environment sensors for fallback is disclosed. The facility for demand control ventilation modulates the volume exchange of outside air into an enclosed space (i.e., air that is external to the enclosed space) by mechanical air conditioning equipment or ventilation system, such as a fan, a Heating, Ventilation, and Air Conditioning (HVAC) system, and so on. Demand control ventilation is used not only to ensure that people within buildings have an allotted amount of fresh air but also to provide a cost savings to users, as a lower amount of airflow can reduce energy use and, therefore, energy costs.