From: Energy Waste: the Benefits of Retrocommissioning, FacilitiesNet

According to James Piper, P.E. HVAC, a contributor to FacilitiesNet magazine, maintenance and engineering managers can address the common culprits in HVAC energy losses, but they also must be on the lookout for additional problems. As systems grow more sophisticated, the number of things that can go wrong multiplies exponentially. They can detect many issues through the diagnostic software that is part of the control system or the facility’s building automation system, but not all of them.

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