You really shouldn‘t Open the window at These Temps if not necessary… ( too high RH for example )
Try to keep Temps constant as possible & warm as possible ( up to 27-28 C )
So close it, put a fan next to the plants for airflow & keep an eye on the RH in your room…
1 C at night can kill your plant, 15 at day is ok but not optimal your plant benefit from a couple of C, that you could reach via closing the window.