4.3.2. Ventilation

The interviewees emphasised the need for ventilation in historical buildings to avoid condensation, which can be done by using mixed mode or hybrid ventilation systems, with mechanical devices improving natural ventilation of buildings in a controlled way, or by passive ventilation using traditional systems such as wind chimneys and louvers. Consistent with this, the literature stresses the importance of systems to control the relative humidity and the ventilation of the indoor environment of cultural heritage buildings to decrease energy consumption while also reducing the risk of degradation [17], and on the potential of chimneys for providing ventilation in traditional buildings [53].

### 4.3.3. Lighting, Heating and Monitoring

The interviewees also suggested improving lighting and heating systems while monitoring climatic conditions throughout the year. The literature presented in Section 2 backs these recommendations.
