In heat, fans promise quick cooling. But from what temperature do you harm more than you help? We show you when fans make sense and give you a concrete decision -making aid.
The World Health Organization WHO is clear: “Use fans only at temperatures below 40 ° C. At temperatures above 40 ° C heating fans.”
The most important rule: 40 degrees are the limit for fans
The science behind it: Our body cools down through sweat evaporation. A fan helps by blown away the moist air – but only when this air is cooler than our body temperature (approx. 37 ° C). At over 40 ° C it literally blows hot air onto the skin. Instead of cooling, there is additional heat supply that can lead to overheating
Your decision -making aid: fan yes or no?
Green light at temperatures below 35 ° C:
- Use the swivel function instead of blowing directly
- Carefully test with allergies or asthma
Be careful between 35-40 ° C:
- Pay attention to your body feeling
- Take breaks if used for a long time (muscle tension)
- Be particularly careful at night
Switch off over 40 ° C:
- Follow the WHO recommendation
- Stop immediately if there is any signs of overheating
What you can do in extreme heat instead
When the fan becomes counterproductive, other measures help: cool showers, moist cloths on wrists and neck, light clothing and regular drinking (1 glass per hour). In the shade it feels up to 10 ° C cooler than in the sun.
Health and frequent myths
In addition to the 40-degree rule, there are other health aspects around fans-some are real, other myths long ago. Muscle tension creates through direct, one -sided cooling of head, neck or shoulders. Allergy sufferers should be careful because fans whirl up pollen and dust.
Cold myth enlightened: drafts alone does not make you sick – only viruses cause colds. It only becomes problematic with weakened immune system or if you freeze through the drafts.
Environment and costs
Fans consume about 50-75 watts, on the other hand, climate systems 2000-3000 watts-that makes them around 30-40 times more economical.
Conclusion: Fans are an energy -saving help in moderate heat. From 40 degrees, however, they become counterproductive and can increase overheating instead of preventing. Taking the WHO limit seriously is more important than any supposed cooling.
Read more on utopia.de:
- 12 frequent mistakes that make you sleep worse in the heat
- Make lemonade yourself: delicious recipes
- 10 tips against sunburn – sun protection factor is not everything
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