AI Insight
Electric fans can paradoxically increase body heat rather than provide cooling when ambient temperatures exceed certain thresholds. The critical temperature at which fans become counterproductive varies based on individual factors such as age and environmental humidity levels. At extreme heat conditions, fans may accelerate dehydration and heat stress by increasing the convection of hot air across the skin.
Why it matters
This finding has important implications for public health guidance during heat waves, particularly for vulnerable populations like the elderly. Understanding when to stop using fans could prevent heat-related illnesses and deaths, especially in regions experiencing increasingly frequent extreme heat events due to climate change.
Understand the Science
Fans can make you hotter rather than cooler, but the temperature at which you should turn them off depends on several factors, including your age and the humidity level
Source: You should turn off fans when it's too hot – but how hot is too hot?