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The paper presents the methodological approach for improvement of energy performance of public buildings in the process of partial refurbishment, having in mind the constrains that are originating from existing technological, material and stylistic characteristics. Being the carriers of wider social and historical connotations, these buildings are often under the certain level of protection as the parts of the cultural heritage making the process of improvement a complex one. For this reason, an improvement path algorithm has been defined and consequently tested on two representative cases investigating the boundaries, possibilities and outcomes of the energy refurbishment procedures.
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