Slide occupancy up and down and compare fixed outdoor air vs DCV: fixed always ventilates for a full house (wasting energy at low occupancy), while DCV modulates OA to hold the CO₂ setpoint.
Interactive DCV lab comparing fixed outdoor air versus demand-controlled ventilation on CO2 and ventilation energy.
40%
Fixed outdoor air
CO₂
700ppm
Outdoor air
100%
Demand-controlled (DCV)
CO₂
1000ppm
Outdoor air
40%
Ventilation energy saved with DCV at this occupancy