Why indoor temperature is more than comfort: it’s about your health
The indoor temperature we live and work in can dramatically affect your sleep, focus, mood and long-term health
Indoor temperature directly affects your health, sleep, and productivity. Homes that are too cold (below 16°C) can increase breathing and heart-related issues, while overheated rooms (above 26°C) often cause fatigue, headaches, and poor sleep. For most people, the healthiest and most comfortable range is 20–22°C. In this article, you’ll learn how indoor temperature impacts your body and focus, what European guidelines recommend, and the ideal temperature for each room to support year-round well-being.
How indoor temperatures affect comfort, productivity, and health
Extreme indoor temperatures impact everyone, but children, the elderly, and people with health conditions are at higher risk. Both cold and overheated environments can affect physical health, mood, and cognitive performance.
Cold environments (<16°C)
- Linked to increased asthma, cardiovascular stress, and depression
- Can make people sluggish, reduce focus, and lower overall job satisfaction
- Elderly and vulnerable individuals are more prone to cold-triggered complications
Overheated rooms (>26°C)
- Can cause fatigue, headaches, poor sleep, and cardiovascular strain
- Drains energy, dampens morale, and harms productivity
- Heat-induced risks are especially concerning for older adults
Productivity and cognitive performance
Research by Helsinki University of Technology and the Lawrence Berkeley National Laboratory shows that productivity peaks at indoor temperatures of 21–22°C. Each degree above this can reduce productivity by up to 2%, highlighting that poor thermal comfort doesn’t just affect health—it also hits economic performance.
Sleep and respiratory health
Thermal discomfort extends beyond work. The wrong temperature in living spaces can impair sleep, reduce focus, and increase the risk of heat- or cold-related health issues. Maintaining a stable indoor climate helps protect physical health, supports better sleep, and ensures cognitive performance remains high across daily activities.
Recommended indoor temperatures across Europe
Although only a few countries set legally mandated indoor temperatures for productivity, many offer recommended ranges—especially for sedentary office work. These guidelines generally suggest 20–24 °C for optimal comfort and performance. Across Europe, governments are becoming more aware of the impact of indoor temperatures on health and productivity, and several have issued official recommendations:
- UK: Minimum 16°C for indoor workplaces (13°C for physical work)[1].
- Sweden: 20–24°C for offices/schools in winter; up to 26°C in summer[2].
- Germany: Indoor workplaces should ideally not exceed 26°C[3].
- Denmark: 20–22°C recommended for sedentary work; 18°C minimum for light work[4].
Across Western and Northern Europe, the average home temperature is around 21°C. In Southern Europe, homes tend to be warmer, around 22–23°C. However, official guidelines — especially in schools and public buildings — remain limited in many countries.
Room-by-room: what’s the ideal temperature?
Different rooms serve different purposes, and require different settings.
Room | Ideal temperature |
Living spaces | 20–21°C |
Bathrooms | 22–24°C (warm enough to avoid post-shower chills) |
Adult bedrooms | 16–19°C (cooler for optimal sleep) |
Children’s rooms | 17–20°C |
Elderly residents | ~20°C stable temperature (to reduce health risks) |
A smart home is a healthy home
Maintaining the right indoor temperature consistently — throughout changing seasons — is key. Most people perform and feel best around 20–22°C, while both colder (<16°C) and hotter (>26°C) environments increase health risks.
Heat pumps, especially when paired with smart thermostats, allow you to maintain this balance year-round. They provide stable heating and cooling while helping improve energy efficiency and overall indoor comfort.
Creating a healthier indoor climate starts with control, consistency, and the right system design.
Key takeaways
- An indoor temperature of 20-22°C is healthiest and most comfortable for most people.
- Both cold (<16°C) and hot (>26°C) indoor environments increase health risks, especially for vulnerable groups.
- Productivity can drop by up to 2% for every degree above 22°C.
- Different rooms require different ideal temperatures, such as 16-19°C for bedrooms and 22-24°C for bathrooms.
- Smart thermostats and heat pumps help efficiently maintain a stable, healthy indoor climate.
Discover how Daikin solutions help you create a healthier indoor climate — talk to a specialist about system design, zoning, and HVAC solutions.
