Back in that day, Japan was not this hot. The situation in the recent couple of years are insane. It would be suicide to sleep without AC on now. I am living i

Back in that day, Japan was not this hot. The situation in the recent couple of years are insane. It would be suicide to sleep without AC on now. I am living in a rather old rented house in Tokyo. The owner was an old couple. A former carpenter and his wife who hated AC so much so the entire house was designed for that purpose. There's everything you mentioned plus 欄間(https://ja.wikipedia.org/wiki/%E6%AC%84%E9%96%93 https://ja.wikipedia.org/wiki/%E6%AC%84%E9%96%93). The air flow of this house is just like you hoped to be. And now, it become suicide to live without AC on. This house isn't efficient for the AC because of the design you wrote. But I have to use AC in order to survive anyway. The owner? They are living near my house, built a new modern house that is more air tight and insulated and constantly using... guess what? AC!