WHO guidelines and the current situation in Japan

The World Health Organization (WHO) recommends maintaining maximum indoor temperatures of below 32°C during the day and below 24°C at night during hot weather, and keeping at or above 18°C in winter, as low indoor temperatures can lead to serious health impacts. In Japan, however, only 10% of housing meet WHO’s recommended winter standards, and many Japanese people are accustomed to their homes being cold in winter.