What does RTU-06 mean? The fan runs outside the schedule with neither heating nor cooling active.
Why does it matter? Fan 'on' instead of 'auto' after hours adds thousands of fan hours a year and pulls in unconditioned outdoor air.
What should you do? Set the fan to auto during unoccupied periods; check for a manual override or a schedule that never releases.
How Energy Agent prices a finding
Written by Pelorus Engineering · Brent Waluzak, P.E. (FL), President, Pelorus Engineering Last updated 2026-09-13
Typical evidence A supply fan left in ON after hours for two weeks.
From a synthetic demonstration dataset, not a customer building.
At a glance Data BAS trend export + occupancy schedule Pricing Capacity-based Effort to fix Low: usually a schedule or setpoint change Screening-level estimates; confirm with measurement and verification before capital commitment.