1. C. Wemhoener, Executive summary IEA HPT Annex 49, 2020.
2. IEA, Annex 49: Heat pump prototype developments and testing for nZEB application, 2020.
3. E.P. and the Council of the European Union, Directive (EU) 2018/844 of the European Parliament and of the Council of 30 May 2018 amending Directive 2010/31/EU on the energy performance of buildings and Directive 2012/27/EU on energy efficiency, 2018. https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32018L0844&from=EN.
4. The future of heat pumps;Futur. Heat Pumps.,2022
5. Economic and environmental analysis of energy renovation packages for European office buildings;Gustafsson;Energy Build.,2017