A common cause of unoccupied setpoint drift is misconfigured schedules or sensor drift; how is it typically corrected?

• A. Ignore minor drift
• B. Recalibrating sensors and updating schedules during commissioning
• C. Replacing all hardware
• D. Increasing ventilation

Answer: (B)

Unoccupied setpoint drift happens when the space’s target conditions wander because sensors lose accuracy or the programmed schedules don’t reflect actual usage. The typical fix is to recalibrate the sensors so their readings match true conditions and to update the schedules during commissioning so setback/restore times and setpoint values align with how the space is actually used. This keeps the control system accurate and properly timed, reducing energy waste while maintaining comfort when the space is empty. Ignoring drift, replacing all hardware, or simply increasing ventilation doesn’t address the underlying sensor accuracy or scheduling issues.