Systems approach is used to enhance the energy performance of an existing building by holistically examining it as a "sociotechnical" system. A student dormitory in the city of Xanthi, Greece, is used as a case study to identify the most appropriate interventions according to the principles of sustainability. In this context, a framework is developed that could be extensively used for energy management of existing buildings as well as of new ones. The "system methodology" of this framework breaks through the limited scope of engineering analysis and emerges as the only available tool to implement the principles of sustainability.
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