“…Discrete On/Off and Fuzzy Logic controller techniques were simulated using Matlab & Simulink, and the results were shown based on occupancy reflected by the collected rooms' CO2 data for energy reduction and system performance. It indicated 62.8% reduction in fan energy consumption using a Fuzzy Logic controller [39]. The investigators [40] have used DCV (demand-controlled ventilation) to change the fan speed according to the change in the room's CO2.…”