In an 18,360 sq/m underground parking garage, located in Newport Beach, California, an AirTest DCV (Demand Control Ventilation) system was installed to drastically reduce the energy consumption. On an annual basis we noted a 90% reduction in energy consumption, which amounts to 185,840 kWh saved each year. With these savings, the cost of the installation of our AirTest DCV system was paid back over 2 years. This project required the installation of 23 AirTest TR2000 sensors, an AirTest CN7216 Controller, and 1 VFD.