Excellent room climate

Clean indoor air for a healthy mind and body

We talk about needing to "clear the air" when referring to an unpleasant, tense situation. It's obvious where this phrase comes from – poor (indoor) air has a negative impact on our wellbeing. It can even result in permanent health problems.


This is especially relevant as many people spend up to 90 % of their time indoors. The right room climate is, therefore, all the more important – be it within your own four walls or in the workplace. There is often room for improvement: we give you tips and show you technical solutions to help you breathe more freely.

Room climate: personal wellbeing boosts performance

There's always something ... Too hot? Open a window! It's draughty? Close the window! Too muggy or humid? Not good. If a person does not feel comfortable in their immediate environment, their performance can drop by up to 50 %. This is because room climate affects wellbeing more than almost any other factor. Of course, we are capable of adapting to certain conditions, but there are boundaries within which any person can achieve their maximum performance – simply because the external conditions are ideal.

Important factors include:

  • Room temperature
  • Humidity
  • Temperatures of the enclosing surfaces
  • Air movement
  • Air purity
A three-person household generates about ten litres of water per day, which are discharged into the indoor air in the form of water vapour.

How does that affect the room climate?

First, of course, there is the weather: summer heat, dry cold, humid conditions when it rains – these external factors are self-evident.

But we ourselves also have an impact: we breathe, cook, clean, shower and exercise, constantly exhaling carbon dioxide into the indoor air as we do so – as well as emitting unpleasant odours, heat and water vapour. A three-person household, for example, emits about ten litres of water per day in the form of water vapour into the indoor air. In addition to this moisture, emissions from building materials and even furniture and floors can have a negative impact. As a result, you may be surprised to learn that we are constantly surrounded by millions of – usually invisible – particles, floating in the air around us.

The logical consequence is that to maintain air quality, the air must be replaced regularly. If it is not, the oxygen content of the air drops while the amount of CO2 and harmful substances it contains increases. And excessive concentration of carbon dioxide in indoor air has been shown to cause discomfort, as well as to negatively affect performance. And none of us want that …

A comfortable atmosphere – the result of good indoor air.

Good air in figures

Ideal air humidity, a pleasant movement of air, recommended air purity and a comfortable temperature: perfect air conditioning comprises many elements. What makes good air? The facts.

Ventilation for fresh air

Gone with the wind: stop losing energy through open windows

When you air your rooms by opening the windows, more than 50 % of heating energy is lost.

Rethink how you air your rooms! Airing your rooms correctly means turning off the radiators and then opening the windows four times a day for five minutes at a time. Even when it is cold outside. When you air your rooms by opening the windows, however, you lose more than 50 % of heating energy. The energy literally goes out of the window.

Furthermore, if you work in an office, for example, you may not even be able to air your home regularly because you are not there to open the windows. The result: high humidity and the risk of fungal mould. As well as being an annoyance, mould presents a health risk, potentially causing respiratory diseases and allergies.

This problem can be prevented relatively simply with modern ventilation systems. These automatically ensure fresh, clean air and offer a significant energy saving potential. Ventilation units with heat recovery, which recover up to 90 % of the extract air as well as heat from the outdoor air, are particularly efficient. All in all, a comprehensive package that also helps you save money.

More about our various ventilation systems

Over 50 percent of heating energy is lost through conventional window ventilation.

Not produced out of thin air: the benefits of advanced ventilation systems

  • Improved indoor air quality
  • Reduction of harmful emissions
  • Improved comfort
  • Heating energy otherwise lost by airing through open windows is retained
  • Energy efficient ventilation through heat recovery
  • Building fabric protection and fungal mould prevention
  • Beneficial for allergy sufferers

Allergy sufferers breathe freely

Ventilation systems: respite for allergy sufferers

Filters in ventilation systems can reduce the pollen concentration in your home by up to 95 %.

Sneezing, difficulty breathing, streaming eyes, swollen mucous membranes – allergy symptoms are a strain on mind and body, and can be highly unpleasant. What many allergy sufferers do not know: ventilation systems can alleviate many of these symptoms. In addition, they reduce the risk of mould formation and, with special filters, can reduce the pollen concentration of indoor air by up to 95 %. Furthermore, regular air changes prevent the propagation of dust mites, which also often triggers allergies.

Whether you choose a decentralised or a central unit makes no difference. What is important is the class of the filters installed. As a general rule, central appliances have a higher air throughput and can usually be operated, for example, with F7 filters. For decentralised devices, the LWE 40 reversible fan is a good choice.

Filters in ventilation systems can reduce the pollen concentration in your home by up to 95 %.

A matter of technology

We have the expertise for innovative solutions

We have the portfolio of innovative products

The demands on ventilation technology are as diverse as today's living spaces and workplaces. Whether you want to maximise potential savings when renovating an older building or are on the lookout for a sustainable concept for your new build, STIEBEL ELTRON offers suitable ventilation systems for every requirement. The products available range from decentralised systems right through to central ventilation units.

Central ventilation units with heat recovery also provide heating, cooling and domestic hot water heating. Home builders in Germany who are planning construction projects should take a closer look at the current Energy Saving Ordinance. For new build, this specifies a permanently airtight building envelope and, at the same time, a minimum air change rate. The good news is that, with a STIEBEL ELTRON system, these requirements are easier to fulfil – not to mention the new systems' high efficiency.

Decentralised ventilation units with heat recovery, on the other hand, are suitable for both new build and modernisation projects. Subsequent installation of a decentralised ventilation system is by no means complicated. Individual units work independently of one another to ensure pleasant fresh air by extracting humid air from rooms such as bathrooms and kitchens. In short: a win-win solution for new build and modernisation projects alike!

Ventilation systems – for the way we build today

Forward thinking homeowners can be recognised by their fresh room climate. For new or existing buildings: STIEBEL ELTRON has the right ventilation solution for every construction project. Better air quality for a healthy atmosphere all round.

"Stale air is a thing of the past for us. We would recommend this ventilation system to anyone."
Torben and Maren Link, homeowners

Innovative ventilation units

The STIEBEL ELTRON solution for clean, fresh air in the home

LWZ 8 CS Premium | The all-rounder for new builds

The compact LWZ 8 CS Premium integral ventilation system with passive house certification offers every comfort and convenience worthy of an energy efficient house. The system draws its energy for hot water and cosy room temperatures from the outdoor air. The advanced ventilation management system ensures that heat remains in the building.

  • Ideal for new builds
  • Compact appliance with ventilation, central heating, DHW heating and cooling functions
  • Energy efficient inverter technology
  • Central ventilation system with up to 90 percent heat recovery
  • Can be combined with a solar thermal system
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VLR 70 Trend | The individual room solution for good air – also for older buildings

The VLR 70 Trend decentralised ventilation unit supplies air to individual rooms and extracts air from them with exceptional efficiency. It recovers heat from the extract air and transfers it to the supply air. Good news for allergy sufferers: the VLR Trend allows inflowing air to be purified by means of a fine dust filter – ideal for alleviating symptoms of allergies. The optimised fan in the ventilation unit ensures near silent operation. The decentralised ventilation system can be installed quickly and easily. Its individual components are installed in those rooms in which they are needed.

  • Decentralised ventilation unit for rooms with exterior walls
  • Up to 93 % heat recovery
  • Suitable for allergy sufferers thanks to optional high quality filter
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