ᐅ The bedroom in the new apartment is difficult to ventilate properly.

Hello,
I have rented out a newly built apartment (built in 2021, KfW-55 standard). There are aluminum roller shutters throughout, and the apartment is equipped with a decentralized ventilation system. The apartment faces southwest, with large window areas, although only the top section of the windows can be opened.

The bedroom faces southeast, and the living room faces southwest. Unfortunately, it is not possible to create an airflow in the bedroom, even when opening the bedroom window and the two large windows in the living room. In the pictures (pictures 2 and 3), I have marked the desired airflow with red arrows.

Unfortunately, no proper air circulation can be achieved, so cross-ventilation in the morning and evening hardly has any effect. Even when the bathroom and storage room are closed, only a slight draft occurs. In the living room, on the other hand, it is possible to create a strong draft due to the many windows and doors.

What is the reason for this? Because there are no windows opposite the bedroom? Because the windows can only be opened at the top? Because there is only one window in the bedroom?
Could a fan help? For example, installed in the hallway? Does anyone have any tips?

Best regards,
Peter

Well, if you don't have a window across from you, how are you supposed to create a cross breeze? You simply can't get airflow around the corner! We have the same issue with our bedroom, which faces northeast. I can get fresh air into all the rooms on the upper floor and cool them down, but not that one. The wind always comes from the southwest here and flows nicely into all the rooms, except where I really need it. I guess you just have to live with it or install air conditioning.