The International Organization for standardization (ISO), Technical Committee 163 "ThermalPerformance and Energy Use in the Built Environment" (ISO/TC 163) has produced and will producesets of standards by reference to which performance requirements can be expressed at various levels,from materials to complete buildings. A coherent set of new work items concerning the energyperformance of buildings has been launched in April 2007 which are briefly presented in this paper.
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