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Cumulative room temperature θM is one of the qualitative indicators for assessing internal environment of buildings in relation to the thermal comfort. The theoretical calculation of the cumulative temperature for heating or summer season is known. Assessing the value under in situ conditions is possible in operating mode of an empty room or with the inhabitants using the appropriate measurement devices. Determining the mean surface temperature of constructions bounding the room appears to be a tough problem. Therefore an infra-red method for assessing the mean surface temperature of a surface has been chosen. The paper describes the combined method application procedure (air temperature measurement method + infra-red method thermography), as well as an example of its application.