Survey in Japan Finds Majority of People Sleep with AC on in Summer

Keeping Cool

A survey in Japan found that 92.5% of the respondents have an air conditioner in their home, and that 38.1% of them always turn it off when going out during the summer. The survey was conducted by market research firm Cross Marketing, targeting people nationwide aged 20 to 69, with a total of 1,100 valid responses received.

Among those surveyed, 56.4% said that they leave their air conditioner on throughout the night. All age groups were above 50%, with especially high rates among those in their twenties and thirties, at 59.0% and 58.2%, respectively. With Japan continuing to face severe heatwaves every summer, the habit of cooling down a room even when outside the home or asleep is becoming the norm among more and more people. 

According to the survey results, the most common temperature setting is between 26.0 ° and 27.5 ° Celsius during the day, and between 27.0 ° and 28.5 ° at night.

Data Sources

• Report on summer use of air conditioning (Japanese) from Cross Marketing, 2025.

(Translated from Japanese. Banner photo © Pixta.)