The current environmental, social, and political pressure for more efficient use of energy led to the emergence of new legislation and directives both at National and European levels and, as a consequence, to the creation of various focused technological initiatives. In this line, several developments are being carried out to increase energy efficiency by reducing the energy consumption of buildings, costs, and carbon emissions, while providing adequate levels of comfort to the building’s occupants. This work intends to contribute to this area, by proposing a conceptual architecture, based on collaborative networks of physical components/devices virtualized as services to compute and communicate information to support efficient energy management of building ecosystems. The architecture is designed considering the functional requirements, the most relevant technological challenges, and the implementation strategies.