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Retro-commissioning is the process of evaluating the specific components of heating, ventilation, and air conditioning, building automation and other energy-consuming systems to determine if they are functioning correctly, and subsequently correcting any deficiencies that are found.  It is very common for older pneumatic (and even DDC) control systems to be out of calibration or simply not functioning properly at all, which causes significant energy waste and discomfort for occupants within the facility.