1. https://ec.europa.eu/energy/en/topics/energy-efficiency/buildings.
2. Directive 2010/31/EU of the European Parliament and of the Council of 19 May 2010 on the energy performance of buildings.
3. Directive 2012/27/EU of the European Parliament and of the Council of 25 October 2012 on energy efficiency.
4. https://ec.europa.eu/energy/en/news/commission-proposes-new-rules-consumer-centred-clean-energy-transition.
5. Romanian Government Ordinance No. 13/2016 of 27.01.2016 on Energy Performance of Buildings.