Digital twins can be used in building engineering to create virtual replicas of physical buildings. These virtual models can then be used to simulate and test various scenarios, such as energy consumption, temperature regulation, and air quality control, to optimize building performance. By using sensors and real-time data, digital twins can also monitor and detect potential issues in the building, allowing for proactive maintenance and repairs. Digital twins can also be used in the design phase to visualize and test building designs before construction, allowing for potential issues to be identified and addressed early on.