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Improving the energy performance of historic districts and their buildings is a balancing act between retaining their heritage significance and allowing the installation of retrofit measures. This paper describes a heritage impact assessment methodology to enable such a balancing process in a well- structured and systematic way. The methodology, developed for the Energy Efficiency for EU Historic Districts’ Sustainability (EFFESUS) research project, is one of six impact assessment modules for a decision-support system, a software tool under development as part of EFFESUS. In this paper, the three parts of the methodology — the heritage significance evaluation, heritage impact definitions and heritage balancing process — are discussed and their use illustrated in a case study.
Eriksson et al. (Thu,) studied this question.