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The issues of energy efficiency and climate change belong to a complex scenario to which contemporaneity is called upon to answer. Architecture can contribute by promoting practices that look at the environment with a view to building the future. As an architectural activity, restoration of heritage buildings can actively participate in this fundamental challenge within the perspective of a circular economy proposing a globally sustainable model. Starting from a state-of-the-art investigation, this paper aims to enucleate the BECK project’s contribution in this field, as well as to underline how careful strategies of conservation and contemporary use can have positive effects on sustainable future scenarios. [ABSTRACT FROM AUTHOR]

The quality of the interior spaces is strongly related to the hygro-thermal conditions which affect the users' comfort, and may yield to preservation risk for the built heritage. Moreover, careless management of exposition spaces with excessive occupancy may result in moisture loads that promote degradation. In this paper, as a case study, an exposition hall representative of the built heritage is considered. The microbiological growth risk is investigated at two different climate conditions, namely Milan and Barcelona, considering varying ventilation rates and number of visitors. The results outline the need of policies informed by advanced analyses to prevent hygro-thermal risk in the absence of dedicated building services, that cannot always be integrated in built heritage. [ABSTRACT FROM AUTHOR]