SEEMPubS specifically addresses reduction in energy usage and CO2 footprint in existing Public buildings and Spaces without significant construction works, by an intelligent ICT-based service monitoring and managing the energy consumption. Special attention will be paid to historical buildings to avoid damage by extensive retrofitting. SEEMPubS will provide control of appliances to effortlessly optimise energy efficiency usage without compromising comfort or convenience and offering decision makers strategies and tools needed to plan energy saving measures. SEEMPubS will make use of the service-oriented middleware for embedded systems being developed in the Hydra project and use its huge potential to create services and applications across heterogeneous devices to develop an energy-aware platform. The SEEMPubS platform will provide necessary functionality and tools to add energy efficiency features to monitor dynamic sensor data in real time, taking advantage of natural resources (like daylight and solar energy) and controlling the operation of both passive and active environmental systems to ensure the best possible comfort conditions with the most efficient use of energy.SEEMPubS will use its real-time energy-awareness services for all users of the Public Space and combine awareness services with a community portal. This will enable collective, community activity motivating positive competition in saving energy, complemented by courses on towards the education on energy efficiency and sustainability. The functionality of this system will be demonstrated on existing buildings at the Politecnico Campus like the Valentino Castle. The validation of the most significant SEEMPubS results will allow to elaborate an energy efficient model for existing buildings and public spaces with a significant economical impact all over Europe. In fact this model could also be applied on many different historical buildings (e.g.palaces, castles and museums) where old energy systems are already in place, avoinding in this way expensive construction works and possible damages.