During night we found that the room is too hot and ask the front desk whether the air conditioning is working or not, it’s fine that it only provide heater. But the staff ask us to open the door for whole night to ‘cold down’ the room. As a tourist, I think this advise is find if I leave at 10th floor above. But we just sleep next to the rooftop of the other building. I think this advice didn’t concern our safety and usefulness.