The article focuses on research on thermal sensations, thermal preferences and thermal sensations vote. The analysis was made on the basis of examining 6 lecture halls in the “Energis” didactic building of the Kielce University of Technology. Air temperature, relative humidity, black sphere temperature, carbon dioxide concentration and air velocity were measured in the tested rooms. There were also surveys concerning thermal impressions prevailing in the lecture halls. On the basis of the answers obtained by the respondents, charts were drawn up regarding thermal sensations, the assessment of air humidity and thermal preferences. It was found that most of the respondents did not feel well in the conditions in which they were staying. Providing users with the right thermal conditions has a significant impact on their health, productivity and well-being.