The building shape and spaces greatly influence ambient temperatures in those spaces. The thermal performance of interior spaces is highly influenced by a number of factors. On top of these factors are as follows: space ratios (height, width, length), walls and facade finishing colors, window openings (height, width, length) and the different types of windows glass, and the vertical and horizontal sun breakers. To achieve this aim, the research is done by the analytical and applied methods, using the simulation software Thermal Analysis Software, from the climatic analysis of New Assiut City as well as identifying the prevailing residential patterns, and detailed study of the selected residential building, identifying the software used, and analyzing the simulation results for ambient room temperatures of the hot periods for shading device protrusion of the selected model. The research ends with a number of results and recommendations. Such results may be applied in hot desert areas.