Well sounds like you're from a warmer climate, so makes sense if the European methods do not apply. I have exactly the opposite problem from you. I don't even

Well sounds like you're from a warmer climate, so makes sense if the European methods do not apply. I have exactly the opposite problem from you. I don't even have AC, plus I'm comfortable at 82F/28C inside so I can keep the windows open all summer. In winter on the other hand, "keeping the window cracked open" like people have commented is definitely not an option. All modern buildings have mechanized ventilation systems for managing this but I live in an old apartment without ventilation, so a large airflow for short periods seems to be the best approach to get fresh air without losing the precious heat.