1. Normative EN 832, Thermal performance of buildings, calculation of energy use for heating, residential buildings.
2. European Directive 2002/91/Ce, Directive 2002/91/EC of the European Parliament and of the Council of 16 December 2002 on the energy performance of buildings.
3. Website CEN-normative, http://www.cenorm.be/cenorm/index.htm.
4. CEN Umbrella Normative prEn 15603, Energy performance of buildings—overall energy use, CO2 emissions and definition of energy ratings.
5. CEN Umbrella Normative prEn 13790, Energy performance of buildings—calculation of energy use for space heating and cooling.