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Story summary
- Fans can increase body heat rather than cool people when ambient temperature exceeds a critical level for older adults.
- Heatwave officials warn fans stop helping above 35 °C, prompting UK health alerts, while the World Health Organization (WHO) cites a cooling limit near 40 °C.
- George Havenith’s study finds a fan raises temperature at 45 °C with 15 % humidity but cools at 38 °C to 60 % humidity, and advises wet clothing for older adults.
