A major goal of sustainable construction is minimization of energy and resources consumption. To ensure careful use of fossil fuels, the strategies of consistency, efficiency, and sufficiency are pursued. For this purpose, appropriate elements have to be found for the building as an entity. Use potentials of the building shell and heating-ventilation-air conditioning (HVAC) systems as well as the user behavior are outlined, with the focus lying on building automation. Apart from the HVAC systems and illumination control, general building automation also includes electric power distribution to the other consumers. Major potentials result from demand-based operation of HVAC systems and a high control accuracy to maintain the specified indoor climate parameters. In addition, load shifting of power consumers may contribute to stability of a future power grid with a high share of renewables.