https://www.sciencedaily.com/releases/2019/11/191120175607.htm

The idea of the smart building is still young. There is no accepted definition yet, but one of the best examples that illustrates the concept is occupant-centric control (OCC). This involves using data gathered from occupants, the indoor environment and the outdoor climate to optimize occupant comfort and control and energy efficiency.

The building's critical functions -- lighting, heating, AC, window blinds and so on -- would be run by a control system that learns information like room occupancy patterns, light use and temperature adjustment. For buildings with dozens or hundreds of occupants, this can have wide-ranging effects on overall energy costs.