Retro commissioning is a systematic process of identifying and correcting operational deficiencies in existing HVAC systems that were not commissioned when originally installed. This detective work uncovers issues like incorrect thermostat settings, damaged dampers, failed sensors, and improper control sequences that accumulate over years of operation. Retro commissioning typically reduces energy consumption by 10 to 20 percent without capital equipment replacement.
Investigation and Documentation
A commissioning agent reviews design documents, interviews maintenance staff, and performs comprehensive testing of system components and controls. They measure temperatures, pressures, airflow, power usage, and sequence of operations. Findings are documented in a detailed report with photographs and performance data that identify each deficiency.
Correction and Value
Building owners prioritize corrections based on cost and impact, addressing safety issues and high-energy-waste problems first. Common fixes include cleaning coils, repairing leaks, recalibrating sensors, and reprogramming control logic. Retro commissioning extends equipment life, improves occupant comfort, and provides measurable return on investment through lower utility bills.