The hardest part of a commissioning or performance engagement was never the fixing. It was the finding. Checking every system in a single 200,000 sq ft office properly takes more than 1,000 engineering hours a year; a dispatch-based model delivers roughly 300 of them. That gap is why 40% of air handling units are carrying a fault on any given day, and why savings decay the moment a project closes.
This playbook is written for the engineer in the middle of it - the mechanical, mechatronic or electrical engineer at an RCx or MBCx firm, an engineering consultancy, or a BMS or mechanical contractor, who analyses BMS and meter data, recommends control strategies, and is accountable for whether the savings actually land. Drawing on CIM's work with engineering partners across the US, UK and Europe, it lays out how FDD changes the delivery model: investigation runs continuously, evidence assembles itself, and every fix is verified at the meter rather than asserted in a report.