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Firstly the question arises, what is building automation system (BAS). Here giving answer to your question
Q. What is Building automation System (BAS) ?
Answer - A building automation system (BAS) is a computerized system that  controls and manages various systems in a building, such as heating,  ventilation, air conditioning, lighting, and security. It uses sensors  and data to automatically adjust and optimize the performance of these  systems, leading to increased energy efficiency and occupant comfort and  safety. In simpler terms, a BAS is a smart system that helps to make  buildings more efficient, comfortable, and secure. 
    Building automation systems (BAS) can help occupants save energy in several ways.
First, BAS technology can automatically adjust the heating, ventilation, and air conditioning (HVAC) system based on occupancy levels, temperature, and weather conditions. This can help to optimize the HVAC system's performance, reduce energy consumption, and lower energy costs.
Second, BAS can turn off lights, electrical equipment, and other systems when they are not in use or when the building is unoccupied. This can help to reduce unnecessary energy usage and lower energy bills.
Third, BAS can provide real-time data and analytics on building energy usage and performance, allowing building managers and occupants to identify areas of inefficiency and make adjustments to reduce energy consumption.
Finally, BAS can also provide building occupants with user-friendly interfaces and control systems, such as mobile apps or touchscreens, that allow them to adjust temperature, lighting, and other systems to their desired levels. This can help to promote energy-efficient behavior among occupants by making it easy for them to adjust settings and contribute to energy savings.
Overall, building automation systems can help occupants save energy by optimizing building systems, reducing unnecessary energy usage, providing data and analytics, and promoting energy-efficient behavior.