Retro-Commissioning Existing Buildings

Most of the building stock that exists today was never properly commissioned, and almost none of it still performs as designed. Occupancy has changed, controls have drifted, plant has been patched, and setpoints have been nudged for a decade by whoever last complained. Retro-commissioning is the process of applying commissioning discipline to an existing, occupied building to recover the performance it has lost, and because the faults it finds are usually cheap to fix, it is one of the highest-return activities in energy management. This lesson covers what retro-commissioning is, how it is structured, and its monitoring-based successor.