Have you ever used a window air conditioner in a house with windows from the ceiling to the floor?

Hello, have you ever used a window air conditioner? Before we moved, we used portable air conditioners in two rooms, but it seems that the portable air conditioner is not working well since we recently moved to a large house in Gangnam with floor-to-ceiling windows. I am curious about how efficient these window air conditioners are. Should I remove the air conditioner in winter and reinstall it in summer? Also, is there a risk of the air conditioner falling into the room? I am worried about safety since my child is still young. It is especially important to ensure safety since we live on a high floor. With the portable air conditioner, there was a plastic panel fitted into the window, but I was less worried because the gap was small. I would like to hear experiences from those who have used a window air conditioner while having a child safety lock installed on the window.