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Back to Knowledge Hub28.04.2026
Air temperature is one of the key factors for a functioning indoor climate. However, in practice it is often considered in isolation. This is exactly where the problem lies: a “correct” air temperature alone is not enough to ensure comfort, energy efficiency and building protection.
What really matters is the interaction between air temperature, humidity and air exchange rate. Only when these factors are properly aligned does a stable and consistently comfortable indoor climate emerge.
Modern ventilation systems play a key role here. They not only ensure a continuous fresh air supply, but also stabilize air temperature and prevent typical issues such as drafts, energy losses or overly dry indoor air.
In this article, you will find concrete values, clear setting recommendations and practical solutions to keep air temperature under control in the long term.
The optimal air temperature always depends on how a room is used. However, there are clear guideline values that have proven effective in practice and balance both comfort and energy efficiency.
| Room | Optimal Air Temperature |
|---|---|
| Living room | 20–22 °C |
| Bedroom | 16–18 °C |
| Kitchen | 18–20 °C |
| Bathroom | 22–24 °C |
These values are designed to:
Not every room requires the same air temperature. The reason lies in how the space is used:
If the same temperature is applied throughout the entire building, problems such as unnecessary energy consumption or uncomfortable indoor conditions often arise.
Air temperature has a strong influence on subjective comfort. However, comfort is not created by warmth alone.
What matters is:
This is where modern ventilation systems show their advantage. They ensure even air distribution and prevent local temperature differences.
In practice, optimal air temperature is typically between 20–22 °C in living areas, 16–18 °C in bedrooms and 22–24 °C in bathrooms. The key is adapting it to the specific use of each room.
Air temperature alone is not a reliable indicator of a healthy indoor climate. Only in combination with humidity and air exchange rate does a stable and comfortable environment emerge.
If you focus only on temperature, you often overlook the real causes of issues such as dry air, poor indoor air quality or unnecessary energy losses.
Even a correctly set air temperature can feel uncomfortable. Typical reasons include:
A room at 21 °C can still feel cold or stuffy if the indoor air quality is poor. This is where controlled ventilation becomes essential.
For a stable indoor climate, temperature and humidity must be coordinated:
| Air Temperature | Optimal Humidity |
|---|---|
| 16–18 °C | 40–50 % |
| 20–22 °C | 40–60 % |
| 22–24 °C | 40–55 % |
If the air is too dry:
If the air is too humid:
The air exchange rate determines how often indoor air is replaced per hour. It directly affects:
Too low air exchange rate:
Too high air exchange rate:
A properly adjusted ventilation system ensures balance and keeps all parameters stable.
Optimal air temperature only works in combination with humidity around 40–60% and a suitable air exchange rate.
Modern ventilation systems actively influence the indoor climate. They not only affect indoor air quality but also the stability of air temperature throughout the building.
Important: A ventilation system does not replace heating, but it ensures that existing heat is used efficiently and distributed evenly.
Ventilation systems continuously supply fresh outside air and remove exhaust air. This directly affects air temperature:
Without a coordinated system, this would lead to noticeable heat losses.
Ventilation systems with heat recovery (HRV) use the energy from exhaust air to preheat incoming supply air.
This means:
Higher ventilation levels do not automatically mean better indoor climate—often the opposite happens.
A ventilation system should ensure a constant air exchange rate and optimal use of heat recovery.
Correct settings determine whether air temperature remains stable or energy is wasted.
Choosing the Right Air Exchange Rate
| Usage | Recommended Air Change Rate |
|---|---|
| Base operation (daily use) | 0.3 – 0.5 per hour |
| Increased occupancy | 0.5 – 0.7 per hour |
| Moisture peaks (bathroom/kitchen) | Temporarily higher |
Decentralised ventilation systems offer advantages because they can be controlled room by room.
Keep temperatures constant. Avoid overheating and cooling cycles.
Heating provides temperature, ventilation ensures indoor air quality and removes humidity.
A properly set ventilation system with heat recovery significantly reduces energy losses.
Goal: keep indoor temperatures below outdoor temperatures.
Decentralised ventilation systems are particularly effective here, as they allow targeted room-by-room cooling.
The key is a constant and coordinated setup.
| Parameter | Recommendation |
|---|---|
| Air temperature (living areas) | 20–22 °C |
| Air temperature (bedroom) | 16–18 °C |
| Humidity | 40–60 % |
| Air change rate | 0.3 – 0.5 per hour |
Air temperature can only be controlled effectively when all influencing factors work together. Temperature, humidity and air exchange rate must be aligned.
A properly configured ventilation system ensures stability, reduces energy losses and improves the indoor climate across the entire building.
Those who rely on consistent values instead of constant adjustments achieve the best results—both technically and economically.
For a deeper understanding of how air temperature interacts with ventilation and overall indoor climate, it is worth looking at existing expert articles. A solid foundation is provided by the article valuable tips for the ventilation concept, which explains the importance of balancing temperature, humidity and air exchange in a well-planned ventilation concept.
For a more technical perspective, the article decentralised ventilation systems: the installer’s guide to energy-efficient air quality shows how modern ventilation systems ensure continuous air exchange, improve indoor air quality and stabilise the indoor climate—an essential factor when controlling air temperature efficiently.
In addition, the article manual ventilation not necessary thanks to simple ventilation control highlights how intelligent control of ventilation systems helps regulate the air exchange rate as needed and prevents unnecessary energy losses, supporting a stable and comfortable indoor climate.
Contact
We provide architects and technical planners tailored solutions to address every ventilation challenge with precision. Whether it is sound insulation, energy efficiency, or optimising facade aesthetics, our expert technical teams are equipped to provide you with the ideal solutions.
With Ventomaxx, you gain access to comprehensive hybrid ventilation concepts that seamlessly combine passive and active systems from a single, trusted source. Our mission is to improve indoor air quality in the most efficient way.
We provide architects and technical planners tailored solutions to address every ventilation challenge with precision. Whether it is sound insulation,
energy efficiency, or optimising facade aesthetics, our expert technical teams are equipped to provide you with the ideal solutions.
With Ventomaxx, you gain access to comprehensive hybrid ventilation concepts that seamlessly combine passive and active systems from a single, trusted source. Our mission is to improve indoor air quality in the most efficient way.
