The paper deals with the numerical modeling and on-site measurements of the thermal conditions in the solar energy facade of the Moravian Library building in the city of Brno, Czech Republic. The numerical computations were done with the aim to determine the operation parameters of the facade, in particular the air temperatures and velocities. The obtained results show that the facade enables preheating of supply air in winter up to 15-20 °C so that it can be directly used for building ventilation. During summer season, free ventilation is able to detract the whole solar gain impacting the facade. The air velocities in the facade do not exceed 1 m.s-1 and so the noise generation does not occur. The facade is therefore able to improve the inner environment and indoor air quality without additional energy costs.