SOLANOVA - Highly-Efficient Ventilation as a means to reach a healthy sustainable standard in retrofit of residential buildings

The main aim of the SOLANOVA project was to transfer the know-how of ultra low energy and passive houses to a sustainable retrofit of the huge stock of obsolete panel buildings in Eastern Europe. There were big controversies about the ventilation system to be adopted, the chosen soltin and justification are presented in this paper along with the first results.