What's the ideal room temperature? It depends on age, health, and room type. Drawing from WHO guidelines and expert studies, here's what you need to know for peak comfort.
Your body constantly regulates its core temperature around 37°C. In cold settings, it burns glucose for warmth; in heat, it sweats to cool down.
The optimal room temperature minimizes these efforts, leaving you comfortable in typical indoor clothing—neither too hot nor too cold.
There's no one-size-fits-all, but trusted sources provide clear benchmarks. The American Heritage Dictionary cites 20-22°C, Oxford around 20°C, and the World Health Organization (WHO) recommends at least 18°C for healthy, warmly dressed adults—rising to 20°C for the elderly, infants, or those with health conditions.
Room-specific advice from France's Ecological Transition Agency (ADEME) refines this further. Aim for 19°C in living rooms or dining areas, adjusting to 20-22°C for seniors based on personal comfort and health.
Bedrooms demand cooler settings to promote sleep—ADEME suggests no more than 17°C, typically 1-2°C below the rest of the home. Bathrooms should be warmer at 22°C for post-shower comfort, about 1-2°C above average.
Office thermal comfort often falls short. A 2015 U.S. survey found 42% of workers deemed summer offices too hot and 56% winter ones too cold.
This dissatisfaction wastes time and money—in the UK, thermostat disputes consume up to 2% of work hours, costing the economy nearly $15 billion annually.
Productivity suffers too. A 2005 insurance company study showed a 10% error rate at 25°C; dropping to 20°C halved productivity. Warmer conditions, meanwhile, foster social closeness and concrete communication, per additional research.
Thermal preferences often differ by gender. Many office standards rely on outdated formulas underestimating women's slower metabolism, which favors warmer environments.
In a study of over 500 German students tested from 16°C to 32°C, performance varied: "As temperatures rose, women excelled in math and verbal tasks, while men declined," notes co-author Tom Chang. Women's gains outpaced men's losses.
In short, warmer rooms boost women's efficiency; cooler ones favor men.
