The difficult financial conditions for energy efficiency have also been reflected in the operation of the buildings. All buildings attempt to reduce energy dependency and generate their own energy. The same is applied to historic buildings. The installation of additional insulation or new windows are a major component in reducing the heating operation of the building. These new constructions will ensure a reduction in heat leakage but will also ensure a reduction in air intake. We change the conditions of the interior environment by adding new constructions. The original leaky opening structures provided us with air exchange. When renovating historic buildings, don’t we have a problem with air exchange? An expensive air handling unit is necessary. Questions, possible solutions are solved in the article. The aim of this paper was the analysis of a selected historic building from the last century. Poor indoor air quality is associated with the occurrence of sick building syndrome symptoms, childhood asthma, allergic diseases and other respiratory infections. This exposure leads to undesirable impact on the educational process. The aim of this study is to determine the condition of indoor environmental quality in selected renovated historical building using as lecture hall in Technical university campus through quantitative and qualitative de-termination of physical and chemical factors. The limit value of PM is set for 24-h exposure was exceeded 13 times. The maximum permissible value for CO2 concentration was exceeded in each of measurements. The highest value of CO2 concentration war exceeded 2.86 times.