Japanese firm's 'human refrigerator' offers relief from punishing summer heat
Trusco Nakayama has sold about 200 of its ¥1.5 million ($9,500) 'Do Hiemon Box' walk-in cooling booths to workplaces across Japan since early 2026, with inquiries now arriving from the U.S. and Germany.
Intelligence analysis by Llama
As Japanese summers regularly exceed 35°C, mid-cap toolmaker Trusco Nakayama has built a stainless-steel box that keeps its interior at 15°C and blows 5°C air to prevent heatstroke, and demand is doubling annually.
A Japanese company that usually makes tools built a tall metal box on wheels that fits a person and blows very cold air on them. People sit inside for a few minutes to cool down when it is super hot outside, kind of like a giant personal fridge for grown-ups at work.
Analysis
From Tools to Thermo-Booths
Trusco Nakayama built its name on machinery, tools, home and office equipment, a portfolio that has grown the company to roughly $1 billion in market value and about 3,300 employees. The Do Hiemon Box is a deliberate sidestep: a stainless-steel cabinet on wheels, fitted with a bench and a window, that plugs into a standard outlet and keeps its interior at a steady 15°C while blowing a 5°C jet of air on the occupant. General manager Fumiaki Matsubara told Bloomberg the concept was "less about providing a place to rest and more about providing equipment that could help prevent heat-related conditions from becoming more severe." The framing matters because it signals compliance-grade utility rather than comfort retail, which positions the unit well with industrial buyers already conditioned to spend on safety gear.
The Heat Economy Hardens
Japan's meteorological reality has shifted decisively in recent years. Summer readings now routinely pass 35°C, NHK runs recurring heatstroke alerts, and authorities have even coined new vocabulary for the worst days. That environment has translated into a doubling of Trusco's broader workplace cooling demand every year, according to Matsubara, on top of tighter government rules aimed at preventing heatstroke on job sites. Roughly 200 units of the Do Hiemon Box have shipped to steel mills, construction sites, golf courses, universities and leisure facilities since early 2026, with the company dispatching units to Kumamoto evacuation shelters after last week's earthquake to combine cooling with disaster response.
Where the Demand Heads Next
Trusco is already eyeing crowded consumer venues, including shopping malls and summer festivals, and has fielded inquiries from as far as Germany and the U.S., suggesting the booth could be exported or licensed. The price tag, ¥1.5 million (around $9,500), restricts the addressable market mostly to corporate and institutional buyers rather than households, and the product is explicitly designed for short recovery sessions rather than extended lounging. If regulatory tightening continues and Asian and Southern European markets see similar heat trajectories, the Do Hiemon Box could become a template for a new category of industrial cooling equipment rather than a one-off curiosity.
Key points
- Trusco Nakayama has sold about 200 Do Hiemon Box units at ¥1.5 million ($9,500) each since early 2026.
- The cabinet holds 15°C air and blows 5°C air onto the occupant, designed for short heatstroke-prevention sessions.
- Buyers include steel mills, construction sites, golf courses, universities and leisure facilities; units were also sent to Kumamoto quake shelters.
- General manager Fumiaki Matsubara says demand for Trusco's workplace cooling products has roughly doubled annually.
- Japan's summers now regularly exceed 35°C, with NHK issuing recurring heatstroke warnings and regulators tightening rules.
- The company has received inquiries from Germany and the U.S., hinting at potential export demand.
If Japan's heat-trend continues and regulators keep tightening heatstroke-prevention rules, Trusco could scale the Do Hiemon Box into a standard piece of safety equipment at industrial and event sites, with Matsubara already flagging doubling annual demand for its broader cooling line.
At ¥1.5 million per unit the booth is priced for institutional buyers, and if a single cooler summer arrives or competitors price similar products lower, the rapid sales growth could plateau. Matsubara's quotes also lean on anecdotal doubling rather than published figures, so there is room for the actual trajectory to undershoot expectations.