Indoor environment for energy performance of buildings – a new European draft standard

European Directive for Energy Performance of Buildings was approved in the beginning of 2003. The transition period is 3-6 years depending of the article. European Standardisation Organisation (CEN) has drafted several standards to help the member countries implementing the directive. One of these is the Criteria for the indoor environment including thermal, indoor air quality (ventilation) light and noise. The standard specifies design values of indoor environment, values to be used in energy calculations, and methods how to verify the specified indoor environment in the buildings. The paper describes some of the principles used in standards, and gives examples presented in the standard. The standard covers all building types but the paper is focuses on the non-residential buildings, numeric examples are given only for offices. The draft standard is under international review process during writing this paper, and subject to changes.