Indoor air too dry?

For an optimal room climate, experts recommend a relative humidity of between 40 and 60 percent. For various reasons, humidity is often lower than this. The drier the air, the more particles it can contain.

To the solutions

Find out below what causes dry air in your home and what you can do about it. However, before we answer these questions, we want to clarify a general point:

What exactly do we mean by dry air?

Air humidity describes the proportion of water vapour in the air. In addition to nitrogen, oxygen, carbon dioxide and other gases, air also contains water vapour. A little-known fact is that the water vapour content depends partly on air pressure and temperature: The warmer the air, the more water vapour it can absorb. Conversely, cold air stores less water and is drier. So in winter the air is usually drier than in summer.

Dry heated air

If (underfloor) central heating in winter additionally heats up the already dry air, it doesn’t automatically pick up more moisture. Obviously, if no moisture is available in the room, the air can’t absorb any. This is what creates warm yet dry air in heated rooms. 

Air conditioning systems also dry out the air. 

Hot summer days can have the same effect, especially if you use an air conditioning unit. If you turn the air conditioning up high, you risk creating a real desert climate. If the air conditioning is set too cold, the indoor air loses moisture (as already explained, cold air is not able to absorb as much moisture as warm air). All this means humidity can quickly drop below the optimal value of 40-60%. 

Dry indoor air from ventilation systems

Ventilation systems save energy and guarantee a constant minimum exchange of air. This ensures the humidity is not too high. However, there’s a problem, especially in winter, because they can quickly dry out the air. If this happens, the first step is to switch the ventilation system to a lower setting. Here are some more tips for a better room climate.

3 ways of increasing humidity

1. Ventilate regularly 

Often small actions can have a big effect. For example, opening the windows several times a day. It lets stale air out and fresh air in. 

This is a great way to improve air quality, particularly in winter. The rule is: better to open windows wide for a short time (five to ten minutes) than to leave a small gap over a longer period. 

2. Pot plants

Pot plants are also a good way of improving the air in your rooms. Large-leafed plants such as Cyprus grass or ferns increase humidity. Some plants even filter out harmful airborne substances. They include ivy, spider plants and rubber plants. 

3. Humidifiers

Another, much less complicated way to achieve the perfect humidity is a humidifier. The appliance helps you achieve the ideal humidity of 40-60% all year round. For example, it moistens dry air caused by heating, air conditioning or ventilation systems.

It also reduces harmful airborne substances in a natural way for feel-good rooms in your home.

Venta Humidifiers

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LW15 Original Air Humidifier
For rooms up to 25 m² Healthy air humidified to an optimal 40 to 60% Hygienic cold evaporation without humidifier mats or filters Uses tap water Naturally reduces harmful substances in the air at a humidity level of 40–60% 
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LW25 Original Air Humidifier
For rooms up to 40 m² Healthy air humidified to an optimal 40 to 60% Hygienic cold evaporation without humidifier mats or filters Uses tap water Naturally reduces harmful substances in the air at a humidity level of 40–60% 
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LW45 Original Air Humidifier
For rooms up to 55 m² Healthy air humidified to an optimal 40 to 60% Hygienic cold evaporation without humidifier mats or filters Uses tap water Naturally reduces harmful substances in the air at a humidity of 40–60 % 
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LW25 Comfort Plus Air Humidifier
Premium Humidifier For rooms up to 45 m² Healthy air humidified to an optimal 40 to 60% Hygienic cold evaporation with innovative VentWave™ technology for increased evaporation performance. The design uses less material for a better eco-balance Uses tap water Harmful substances in the air naturally reduced at an indoor humidity of 40 to 60% Digital hygrostat monitors and controls relative humidity Interactive touch display 
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LW45 Comfort Plus Air Humidifier
Premium Humidifier For rooms up to 60 m² Healthy air humidified to an optimal 40 to 60% Hygienic cold evaporation with innovative VentWave™ technology for increased evaporation performance. The design uses less material for a better eco-balance Uses tap water Harmful substances in the air naturally reduced at an indoor humidity of 40 to 60% Digital hygrostat monitors and controls relative humidity Interactive touch display
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LW73 AeroStyle Air Humidifier
Room size up to 70 m² Healthy air humidity for optimal 40-60 % Hygienic cold evaporation without humidifying mats or filters Use with tap water without chemical additives Natural reduction of pollutants in the air at a room air humidity of 40 to 60 %Low-maintenance operation with special Venta hygiene discDigital hygrostat for monitoring and controlling the relative humidityInteractive touch displayPleasantly quiet operationOptional remote control via app 
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LW74 AeroStyle Air Humidifier
Room size up to 90 m² Healthy air humidity for optimal 40-60 % Hygienic cold evaporation without humidifying mats or filters Use with tap water without chemical additives Natural reduction of pollutants in the air at a room air humidity of 40 to 60 % Low-maintenance operation with special Venta hygiene disc Digital hygrostat for monitoring and controlling the relative humidity Interactive touch display Pleasantly quiet operation Optional remote control via app 
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AeroStyle LW73 WiFi
PREMIUM HUMIDIFIERRoom size up to 70 m² Healthy air humidity for optimal 40-60 % Hygienic cold evaporation without humidifying mats or filters Use with tap water without chemical additives Natural reduction of pollutants in the air at a room air humidity of 40 to 60 %Low-maintenance operation with special Venta hygiene discDigital hygrostat for monitoring and controlling the relative humidityInteractive touch displayPleasantly quiet operationRemote control via app 
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AH902 Professional Air Washer
Airwasher with hybrid functionality as an air purifier and humidifier Room size up to 70 m² Highly efficient humidification with VentWave™ 3D technology Low-maintenance operation thanks to patented hygiene disk – without chemical additives Certified Nelior filter technology with HEPA 14 clean room filter acc. to DIN EN 1822 Coarse dust filters for particles down to 10 μm increase the service life of the HEPA 14 clean room filter Up to 99.9 % sterilisation thanks to UVC technology Professional sensors for real-time air quality & humidity display Convenient control with the Venta Home App 
LPH60 WiFi App Control Air Washer
HYBRID – PREMIUM AIR PURIFIER AND HUMIDIFIER Room size – purifies up to 45m², humidifies up to 95 m² Coarse dust filter (washable) Allergen, virus and fine dust filter removes particulates down to a size of 0.1 μm Active carbon filter eliminates odours/gases down to particle sizes of 0.0002 μm (optional) Unique sensor technology – intelligent measurement of air quality and humidity for separately controlled air purification and humidification functionsHygienic cold evaporation without humidifier mats Uses tap water Patented hygiene disk for pure water without chemical additives, low-maintenance continuous operation 
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