The atrium is becoming more prevalent in desert regions as a key architectural and functional element in the urbanlandscape. In southern Algerian cities, we are observing an increasing integration of centralized atriums in publicbuildings. However, this integration may have an impact on the indoor environmental conditions of the buildings. Thisstudy investigates the influence of architectural aspects on the indoor thermal behavior of an existing centralized andenclosed atrium in the hot and dry climate of Laghouat. The study analyzes the influence of tow parameters, namelyheight and glazed area ratio, during summer season. The EDSL-Tas software for dynamic thermal simulation modelingwas used. The results revealed that the vertical temperature distribution in the atrium varies depending on its design,as a result of incoming solar radiation.