The recent energy crisis is encouraging researches to utilize renewable energies in new cities and to activate their applications. One of the most important energies is generating electricity from solar energy directly via Photovoltaics (PV), PV systems have varied and widened in many desert areas in Egypt in the current century. The current electricity supply has many defects and disadvantages, and this leads necessarily to another alternative such as PV systems, as PV efficiency has increased and their costs have been reduced, also many new visions of applying PV systems on building envelope have emerged, and many simulation software are currently used to study and evaluate the quantitative performance and the economic impact of such systems. The paper aims to evaluate applying current PV systems on the existing models of residential buildings in new cities in Egypt, and accurately the study is focusing on the youth housing models in new Assiut city, furthermore, a simulation software is used for more accuracy to calculate the quantitative adequacy and the economic impact of PV application. The paper starts with the research motivations and the need to PV systems in Egypt, and a theoretical background of current PV modules that can be used in such case studies. Then, the PV application cases on each model are specified from varying application methods, PV modules distribution, reinforcing techniques and others. Furthermore, the quantitative and economic impact is illustrated for each case by using a simulation tool. Then, analyzing characteristics, advantages and defects of each case is articled to extract the main results. Finally, the paper ends with specifying the appropriateness of applying PV systems on the case study, and the main features of extending such systems on new cities in Egypt and treating the disadvantages was discussed.