In the winter it's cold outside and opening the window cools down the room -> no ventilation most of the time. In the summer it's not a problem for me, I leave

In the winter it's cold outside and opening the window cools down the room -> no ventilation most of the time. In the summer it's not a problem for me, I leave my windows partially open all the time but in the winter especially when working from home this would be quite neat. Also, I live in a small town in germany so the air quality here is comparatively good to many of the city folks here.