Japan built a 'human refrigerator' that cools your body in just 5 minutes

Japan has unveiled a novel cooling solution designed to rapidly reduce body temperature in response to extreme heat, a “human refrigerator” called the Do Reimon Box. Developed by TRUSCO Nakayama Corporation, the walk-in booth offers quick relief to outdoor workers exposed to high temperatures, aiming to mitigate the risk of heatstroke and other heat-related illnesses. The Do Reimon Box is a compact, single-person cooling unit constructed from stainless steel. Users enter the booth, sit on a chair, and close the door behind them for a brief cooling session. Inside, the environment is kept at approximately 15°C, with targeted jets of air cooled to around 5°C directed toward the neck, head, and back, areas crucial for thermoregulation. This localized cooling allows individuals to experience significant relief within five to ten minutes. The session is automatically capped at 20 minutes to avoid overcooling and ensure user comfort and safety. Designed to address the growing threat of heat-related health issues, the Do Reimon Box targets industries where workers face prolonged exposure to high temperatures. Construction, manufacturing, logistics, and road maintenance are among the sectors most affected by heat stress. With Japan experiencing increasingly severe summer conditions, the device aims to support workplace safety by providing immediate cooling during scheduled breaks. However, it is not intended to substitute for essential measures such as hydration, rest, or medical care. The concept of the Do Reimon Box was inspired by refrigeration technology commonly found in frozen food vending machines. Engineers modified this system to create a human-sized cabin capable of delivering effective, localized cooling while maintaining a safe and comfortable environment. The booth runs on a standard 100-volt power supply, features built-in casters for mobility, and requires no permanent installation, making it adaptable for use in temporary or industrial settings. As global temperatures rise due to climate change, the need for innovative solutions to combat heat stress becomes ever more pressing. Technologies like the Do Reimon Box represent a shift toward personalized cooling options that complement existing safety protocols. While not a medical device, the booth introduces a new dimension to occupational heat management, offering a practical tool for environments where conventional air conditioning is insufficient or unavailable. The introduction of the Do Reimon Box reflects broader efforts to enhance worker well-being in extreme weather conditions. With heatwaves becoming more frequent and intense worldwide, such innovations could set a precedent for future workplace safety standards. The success of the Do Reimon Box will depend on its adoption and integration into industry practices, as well as ongoing research into optimizing its effectiveness and accessibility. For now, it stands as a pioneering example of how technology can address one of the most pressing challenges of modern labor conditions.