Good indoor air is quality of life

Over the course of our lives, we breathe a lot 600 tons room air. Our bodies take in around 200 times as much air as we eat every day. healthy, fresh air indoors should therefore a matter of course be.

More than just O2

We call the good air that we breathe in “Fresh air” . It should be objectively clean - that means it is free of impurities and does not contain any substances that are harmful to health above defined guideline values. In addition, good air must also be available pleasant , naturally and fresh be felt. Clean air contains 78% nitrogen, 21% oxygen, 0.03% carbon dioxide and 0.93% noble gases and is odorless and colorless.

Factors for good indoor air

Good indoor air is largely free of pollutants and is characterized by the following main factors that are responsible for well-being and health:


The relative humidity should be between 40-60% permanently . This value is a good compromise between a high Feel-good factor for people and the prevention of mold formation, but also for energy requirements and influence on furniture. Measuring and monitoring the humidity in the rooms can be done using a hygrometer.

Too humid
Too high humidity in the room air or on the masonry is usually the cause of:

a) Construction defects/damage

  • Insufficient drying after construction work
  • Water ingress due to water pipe damage, flooding, leaky roof, cracked masonry

So make sure there is sufficient drying time for new buildings or renovation work. Structural damage or water damage must be repaired.

b) Insufficient removal of humidity

  • Incorrect ventilation and heating
  • Thermal bridges due to construction defects or construction errors

It is important that the Moisture that arises from activities in the room through regular ventilation is discharged to the outside . For example, in one Three-person household through showering, washing, cooking, drying clothes but also through plants, aquariums and other sources of moisture every day 6 to 12 liters of water released .

Too dry
The optimal humidity is not only a feel-good factor, but also has also Impact on human health . A lower susceptibility to infectious diseases requires a sufficiently high humidity of at least 30%, preferably 40%. But not only Flu viruses have a lower survival rate at higher humidity . It has also been confirmed that the symptom of dry eyes or dry nasal mucous membranes improves with higher humidity: dry room air can irritable and dry lead to mucous membranes . The nose and throat are particularly affected. Bacteria and viruses can more easily penetrate dry mucous membranes and trigger inflammation or colds. Nosebleeds can also be a result.


Through correct ventilation and heating can the humidity in the inner space limited and be regulated . It's best to do it several times a day for a few minutes each time Shock or cross ventilation (Open the window completely or open the opposite windows wide). Controlled living space ventilation can also help: it ensures healthy indoor air quality all year round and eliminates excess moisture.

Air temperature


Each of us has a different sensitivity to temperature and finds ourselves more comfortable at different temperatures than other people. Nevertheless, you should a certain temperature range for a generally comfortable indoor climate comply with :

  • Living space: 20 to 23 degrees
  • Bedroom: 16 to 18 degrees
  • Kitchen: 18 to 20 degrees
  • Bath: 20 to 23 degrees
  • Toilet: 16 to 19 degrees

The Temperature difference between Foot and head height should too are below 4 degrees.
Lowering the temperature at night makes sense from an energy saving perspective - but this should not go beyond 4 to 5 degrees, otherwise the apartment will cool down too much.

Heat properly
Which room temperature the “correct” is depends on various factors: physical activities, age, clothing or diet. With the help of room controllers and thermostatic valves, you can set the temperature individually for each room. If you're not at home, never turn off the heating completely. Maintaining a reduced average temperature is more economical. Also keep the interior doors between differently heated rooms closed during the day and at night . To ventilate, it's best to open the window completely for a few minutes several times a day - Tilted windows are not very effective for ventilation and waste energy .

Long curtains, sofas or desks in front of the radiators hinder the heat release . Tie or shorten curtains to the side. But: close the curtains at night, The resulting air cushion between the curtain and the window reduces heat loss .

Air ions

The “power particles” in the room air
Like all substances, air consists of molecules. A molecule with a negative charge is a negative ion. The more of these ions in the air, the “fresher” it becomes. The air in high mountains or near a waterfall, for example, contains a very high number of these air ions . Air enriched with air ions promotes the enrichment of the blood with oxygen, which improves the function of the organs and the nutrients are burned better. The performance increases .

Your ionic climate in the interior

Air pollution and exhaust gases destroy the negative ions . That's why the number of ions in our cities is often very low or even non-existent.
Be sure to avoid smoking in your living space : the aerosols from cigarette smoke destroy the air ion climate of a room (apart from the pollutants from cigarette smoke). The following also applies to the air ion climate: Ventilate regularly. Every ventilation regenerates the air ion climate . Also pay attention to low electrostatics in the room due to modern flat screens and plastic surfaces.
New methods make it possible to permanently enrich the room air with ions and can be used for interiors.

The LENDOU air purifier has one Ionizer , which the air additionally enriched with ions :

Fresh air

Fresh air is usually cool, dry air from a pollutant-free, natural environment. There should be enough fresh air indoors. The carbon dioxide content should be below 0.1% by volume and the fresh air supply should be 20-30 cubic meters per hour per person. The CO 2 content of the air is therefore of great importance for people's well-being . If the concentration of carbon dioxide in a room increases, we become tired and our concentration suffers.

air speed

Seal doors and windows

A constant draft can disrupt your well-being due to a constant breath of cool air in a living room . Accordingly, leaky areas (such as doors, windows, etc.) should be equipped in such a way that any draft is avoided. Air movement describes the speed at which air passes the body . This is perceived and felt differently by everyone and also depends on the activity in the room and the room temperature. From an air speed of 0.2 m/s it can be perceived as unpleasant and should therefore be avoided. To detect drafts, you can use a burning candle : Observe whether the flame flickers in your window or on the floor near the door - clear evidence that there is a draft.

A touch of discomfort

A leaky window, an open door, by the time you notice the cold breath, it's usually too late. Neck and back pain, cold symptoms such as a runny nose, sore throat, sinus problems, compulsion to clear your throat, these are some of the possible consequences of drafts. Unprotected parts of the body cool down significantly due to the constant draft. A warm, light draft is better tolerated by the body than a cool one. When the body cools down, weaknesses in the immune system occur and lead to the symptoms mentioned above.

That's why regulated air conditions are pure quality of life