Abstract. Main parameters of indoor air quality could influence people health and ability to work and ability to learning. The research was conducted in University of Technology building located in Białystok, north-eastern Poland. Research -surveys was devoted to issues related to the thermal comfort in a classroom of university. Interviewees declared perceptible temperature and described their feelings connected to the temperature sensation. Other indoor parameters were also analysed such as: temperature, humidity and indoor air quality and noise level. Peoples -students filled the surveys about thermal comfort and indoor parameters. The research included indoor thermal comfort.