Smart buildings are at the forefront of energy efficiency, employing innovative technologies to reduce consumption. Building Automation Systems (BAS) play a pivotal role by integrating components like HVAC and lighting control. Through AI and IoT, BAS optimizes HVAC operation, potentially saving up to 25% of electricity consumed by these systems. Smart lighting control, including features like dimming and occupancy-based switching, can save 35-40% of lighting energy. Integrating BAS with other systems further enhances efficiency. Additionally, IoT sensors monitor occupancy, automatically adjusting settings when spaces are unoccupied. These measures not only reduce energy consumption but also lead to cost savings and sustainability. Overall, smart buildings contribute significantly to global energy reduction and positively impact worker productivity and property value .