No construction required, install it yourself. Isn't a window air conditioner actually convenient?

This article has been edited and republished from August 8, 2024. This might be the best solution after all. In summer in Japan, air conditioners have become a life support system. But do you want to install air conditioning in rooms that you don't usually use? I'm a little worried when you say that. My family also says, ``I don't usually use it...''