HVAC Glossary

Occupied Mode

Last updated: March 11, 2026

Occupied Mode is an operational state where HVAC systems actively maintain comfort setpoint temperatures in all zones actively in use, with full ventilation and humidity control operating as designed. This mode prioritizes occupant comfort and indoor air quality while the building is populated.

Operating Parameters

In Occupied Mode, thermostats maintain heating setpoints at 70-72°F and cooling setpoints at 74-76°F per ASHRAE Standard 55 comfort guidelines. Ventilation systems deliver minimum outdoor air per ASHRAE Standard 62.1, typically 15-20 cubic feet per minute per person. Dehumidification controls operate to maintain relative humidity between 30-60%. All zones condition regardless of individual room status, prioritizing consistent comfort across the building.

Control and Automation

Occupied Mode can activate manually via wall switches or automatically through occupancy sensors and scheduled routines. Building management systems detect occupancy using motion sensors, calendar schedules, or card readers. Manual override capabilities allow occupants to extend occupied settings during unusual hours. This mode consumes maximum energy but ensures optimal comfort, air quality, and equipment performance during active use periods.

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