The proposed tool provides effective automation and control of heating/cooling, ventilation/air conditioning and lighting that leads to increase operational and energy efficiencies according to the energy efficiency requirements of EN 15232. Complex and integrated energy saving functions and routines can be configured on the actual use of a building depending on the real user needs to avoid unnecessary energy use and CO2 emissions. These functions include individual room control with communication between controllers, temperature control of distribution network water temperature regarding heating/cooling control, air flow, temperature and air humidity control concerning ventilation and air conditioning, as well as automatic or manual daylight control and occupancy detection for lighting. Moreover, the tool can be appropriately customized so as to provide information for operation, maintenance and management of buildings especially for energy management (trending and alarming capabilities and detection of unnecessary energy use). In addition, the proposed tool provides the opportunity, especially to the users of tertiary sector building, to increase energy efficiency, reduce costs and improve energy performance into the framework of ISO 50001 Energy Management Standard.