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Introducing cost-optimal levels for energy requirements

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The recast of the Directive on the Energy Performance of Buildings (EPBD) states that Member States (MS) must ensure that minimum energy performance requirements for buildings are set “with a view to achieve cost-optimal levels”, and that the cost-optimal level must be calculated in accordance with a comparative methodology. This article discusses the methodology for calculating cost-optimal levels, describes the timeline and describes the difference between cost effectiveness and cost optimality. It comments on cost-calculation prospectives and presents the role of reference buildings and existing building stock.