The technology method that focuses on improving the efficiency of energy usage in smart buildings is known as Building Automation Systems (BAS). These systems integrate various technologies, including sensors, actuators, and software to monitor and control a building's environment, such as lighting, heating, ventilation, and air conditioning. By utilizing real-time data, BAS optimizes energy consumption and enhances occupant comfort. Techniques such as predictive analytics and IoT connectivity play crucial roles in enabling smart buildings to automatically adjust based on usage patterns, ultimately reducing operational costs and environmental impact.