Air Conditioning Habits in Japan

A Japanese office in the height of summer keeps its thermostat set to 28 degrees Celsius, employees fanning themselves at their desks in short-sleeved “cool biz” shirts, while a visiting foreign colleague wonders why nobody simply turns the air conditioning down further.

Japan’s relationship with air conditioning runs on a different set of assumptions than many Western countries — shaped by energy policy, seasonal habit, and a cultural comfort with adapting behavior to the weather rather than simply overpowering it with technology.

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The 28-Degree Standard

Japanese government guidelines have long recommended setting office and public building air conditioning no lower than 28 degrees Celsius (about 82 Fahrenheit) during summer months, a temperature many visitors from more air-conditioning-reliant countries find genuinely uncomfortably warm for indoor space. This isn’t simply a suggestion ignored in practice — many companies treat it as close to a firm internal policy, particularly larger corporations and government offices where compliance is more consistently enforced.

The guideline dates back to energy conservation measures following the 2011 Fukushima nuclear disaster, when several nuclear plants went offline and Japan faced genuine electricity shortage concerns, prompting nationwide conservation campaigns that included this specific, widely publicized temperature recommendation for cooling settings.

Cool Biz and Warm Biz

To make the 28-degree standard bearable in professional settings, the Japanese government launched Cool Biz, a campaign actively encouraging — and in many companies effectively requiring — a relaxed business dress code during summer months: no jackets, no ties, short sleeves permitted even in otherwise formal corporate environments. This represented a genuine shift in Japanese business dress norms, which had historically been notably formal and conservative regardless of season or comfort.

A parallel Warm Biz campaign addresses winter heating with the same underlying energy-conservation logic in reverse, recommending heating no higher than 20 degrees Celsius and encouraging warmer layered clothing, undershirts, and sweaters at the office as an alternative to simply raising the thermostat further.

Home Cooling Habits

Air conditioning in Japanese homes has traditionally been used more selectively than in many Western households, often limited to specific rooms actively occupied rather than running continuously throughout an entire home. This connects to the same room-by-room functional thinking behind Japan’s flexible, multi-purpose room design — cooling only the space actually being used is a natural extension of a broader domestic philosophy that treats each room’s function as something to be actively managed rather than left running by default.

This more selective usage pattern has been gradually shifting as extreme summer heat has intensified in recent years, with rising public health concern about heatstroke risk, particularly for elderly residents, prompting government messaging that now actively encourages more liberal air conditioning use specifically as a health and safety measure rather than continuing to prioritize energy conservation above all else.

The Heatstroke Reversal

A genuinely significant shift in Japanese public health messaging has occurred in recent years: after decades of encouraging conservative air conditioning use for energy-saving reasons, government and media campaigns now explicitly urge people, especially elderly residents living alone, to use air conditioning more freely during extreme heat, directly linking heatstroke deaths to previous generations’ reluctance to run cooling systems even when genuinely necessary for safety.

This reversal reflects rising summer temperatures pushing traditional conservation-minded habits into genuinely dangerous territory, particularly for older residents who grew up with strong cultural conditioning around energy thrift and modest resource use, sometimes to the point of underusing air conditioning even when their own safety was at meaningful risk.

Non-AC Cooling Methods Remain Popular

Alongside air conditioning, Japan maintains a genuinely active culture of alternative cooling methods that predate mechanical air conditioning entirely. Uchiwa and sensu folding fans remain common practical items, not just souvenirs, handed out for free as promotional items at summer festivals and events. Cooling towels, neck-worn cooling devices, and portable handheld fans are widely sold and used, particularly by commuters and anyone spending extended time outdoors during Japan’s intensely humid summer months.

Traditional architectural elements designed for passive cooling — sudare reed blinds that block direct sun while allowing airflow, and the engawa transitional veranda space found in older homes — reflect a long-standing design tradition built around working with natural airflow and shade rather than relying entirely on mechanical climate control, an approach increasingly revisited as a genuine complement to air conditioning rather than simply a historical curiosity.

Air Conditioning Technology in Japan

Japanese air conditioning units, dominated by brands like Daikin, Panasonic, and Mitsubishi Electric, are typically wall-mounted split systems rather than central air, individually controlling single rooms rather than an entire home simultaneously — a hardware reflection of the room-by-room usage philosophy described above. These units are often highly energy-efficient by international standards and frequently include both heating and cooling functionality in a single unit, since many Japanese homes lack separate central heating systems entirely and rely on the same split air conditioner for both functions across different seasons.

Frequently Asked Questions

Why do Japanese offices set air conditioning to 28 degrees?

This is a long-standing government energy conservation guideline, intensified after the 2011 Fukushima disaster caused electricity shortage concerns, and many companies treat it as close to firm internal policy during summer months.

What is Cool Biz in Japan?

Cool Biz is a government campaign encouraging relaxed summer business dress — no jackets or ties, short sleeves permitted — specifically to make working in warmer, less air-conditioned offices more bearable.

Has Japan’s attitude toward air conditioning changed?

Yes, significantly. Rising extreme heat and heatstroke deaths, particularly among elderly residents, have shifted government messaging from encouraging conservative use toward actively urging more liberal air conditioning use as a genuine safety measure.

Do Japanese people use fans instead of air conditioning?

Often as a complement rather than a replacement. Folding fans, cooling towels, and portable handheld fans remain widely used alongside air conditioning, especially outdoors or during commutes, reflecting a long tradition of non-mechanical cooling methods.

What Air Conditioning Habits Reveal About Japan

Japan’s approach to cooling reflects a broader national comfort with adapting behavior and clothing to environmental conditions rather than simply engineering the environment into total submission, an instinct reinforced by real energy constraints following the Fukushima disaster.

The recent, urgent reversal toward encouraging more air conditioning use in the face of genuinely dangerous heat shows a country actively renegotiating a deeply ingrained conservation habit against a changing climate reality — a small but telling example of cultural adaptation happening in real time.

Why Air Conditioning Habits in Japan Differ From the West