Thermal environment
In comfortable thermal environment room air temperature is individually adjusted to right level (typically 20…24OC), is not varying frequently and air temperature difference between floor and ceiling is less than 3OC. Window surface is not too gold (above 14OC) or warm (under 30OC). Direct solar radiation is prevented with effective shading.

Drought feeling
Draught is an unwanted local cooling of the body caused by air movement and temperature. It is the most common complaint in many ventilated spaces. Drought feeling can be avoided by designing thermal environment correctly and allowing individual control as well as avoiding too high air velocities especially in intermediate seasons and wintertime. Often drought is a result of technical problem in HVAC system, e.g. unbalanced ductwork or badly directed air diffusion. Sometimes down draught and radiation of gold window surface generates it.

Acoustic environment
Good acoustic environment is dependent on the use of space. In a cellular office, wall structures and doors are used to isolate the airborne sound from surrounding spaces. In addition, the airborne sound inside the room shall be sufficiently absorbed. In open plan office spaces the background noise is used to cover sounds from surroundings and therefore improving acoustic privacy. The main target in the acoustical design of meeting rooms is that the participants are able to hear and to become heard. This can be reached by low background noise and low reverberation time.

Light environment
In good lighting environment working surfaces are sufficiently lighted (a. 500 lux) and there is no harmful glares. Good contrast conditions can be created using indirect lighting (a.70%) and good modelling conditions by using direct lighting (a.30%). Aesthetic environment have soft transformation between dark and light areas.

Indoor air quality
Indoor air quality can be improved either by eliminating the internal pollution sources or diluting them by ventilation. Whenever air intakes are not controlled and untreated outdoor air comes into building, also the quality of outdoor air may generate a health risk. Minimum fresh airflow rates are defined based on national building code. However in many cases higher air volumes are recommended in order to achieve higher indoor air quality. Typical value is to provide 10-12 l/s fresh air per person.