"Commissioning for existing buildings (sometimes referred to as retro-commissioning or RCx) is a systematic process for investigating, analyzing, and optimizing the performance of building systems by improving their operation and maintenance to ensure their continued performance over time. This process helps make the building systems perform interactively to meet current facility requirements. The campus RCx teams have found a 29 percent average reduction in energy use and emissions for the 14 existing buildings (2,347,170 sq. ft.) they have examined. This success rate shows that there is enormous potential for this reduction strategy. Campus RCx activities have included: repairing and recalibrating sensors, valves and dampers, upgrading control systems, demand control ventilation, and implementing scheduling for air handling units, among others. The current RCx program is being augmented by several Energy Service Company (ESCO) contractors. A plan to revisit every building on a 5- to 8-year basis should also be instituted in order to maintain these savings. A direct-digital control command center to monitor temperature control and alarms to determine when systems fail or inappropriate temperature settings are being utilized will be constructed by the end of calendar year 2012. Based on the campus RCx program performance to date, savings proposed by SAIC for this section can be increased. The new target for RCx is 12 percent."