Indoor climate

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The indoor climate describes the factors that can have an influence on people's well-being indoors.

The indoor climate is an essential component of living quality and comfort . It is mainly determined by the temperature of the air and the humidity . Also have an influence on the comfort of a room

• the chemical composition of the air with possible pollutants and odor nuisance,
• different surface temperatures of the walls, floors and furniture,
• Draft ,
• the lighting , in particular solar radiation and artificial light and its color temperature .

The humidity will be noticed by people only with extreme values. However, even moderately high relative humidity leads to condensation and mold formation on cool surfaces. In building biology , the phenomenon is also known as summer condensation .

When the humidity is very low, materials such as wood, leather or plastic become brittle or cracked and dry out. The human body is also sensitive to insufficient humidity. Burning eyes, chapped lips and dry mucous membranes are the result. Too low humidity in public buildings with a high number of visitors leads to an increased risk of infection. On the other hand, too high humidity is usually perceived as oppressive.

Cold surfaces can make a heated room uncomfortable.

Internal and external loads can have a significant impact on temperature and humidity:

• The internal loads include:
  • the users with their heat and moisture input, depending on the activity,
  • Devices and machines (heat and drafts, odor pollution, pollutants),
  • Uses: Washing, showering and cooking increase the humidity.
• The external loads include:
  • solar radiation ,
  • Heat conduction through the walls, floor and ceiling,
  • Change of temperature and humidity through ventilation ( joint ventilation , gap ventilation and shock ventilation ).

Web links

• Ventilation computer (temperature and humidity of the room air, ventilation rates, sources of humidity in the room, etc.)

Individual evidence

1. ↑ Tim Stoffregen: Summer condensation , June 28, 2016, LADR
2. ↑ 40 percent: Establish healthy humidity , January 30, 2020
3. ↑ Clean air - healthy indoor climate , January 30, 2020
4. ↑ Tim Stoffregen: Indoor climate and mold growth , September 21, 2016, LADR