BPS aimed to minimize final energy loads has been done as a prerequisite to conduct deep energy refurbishment leading to the effective integration of solar energy. Identified moisture penetration in building envelope directed envelope structure to be changed to ventilated façade within refurbishment works (PV glazed second façade as the most appropriate concerning construction works and existing building structure statics). New façade cooling and heating loads and their dynamics for different levels of PV glazing’s transparency and different designs, regimes and uses of ventilation air are studied (encompassing Indoor space comfort, and outdoor air-wind influence CFD and co-simulation analysis).