Increasing Population, Fast economic growth, and the end of fossil fuels have raised concerns over energy supplies in the current century. Therefore, tend to utilization of renewable energy has been increased the energy conservation in buildings. Energy improvement in buildings has not only reduced our dependence on fossil fuels, but also has a significant effect on emission of greenhouse gases. The application of phase change materials in construction of building is one of the newest and the most effective methods for thermals energy storages of building. In this study, at first, phase change materials PEG-600 was stabilized by silica fume. Thermal performance and thermal energy storage capability of the one side and two side cement mortar including CM with 5, 10 and 15 precents and macroencapsulated PCMs were investigated. The specimens were tested under the weather temperature condition of 27 Shahrivar day of Kerman and Tabriz cities. For thermal performance test of specimens, an innovative experimental setup called “Daily Temperature Simulator” was employed and the maximum reduction of inner side temperature and the reduction of ultimate inner side temperature and time delay to reach to the maximum temperature were measured as the thermal performance criteria. Furthermore, the charge/discharge process of the PCM during a complete day was evaluated. Results state that the application of phase change materials in concrete walls would reduce the inner side temperature of the wall up to 6.3 °C and up to 5.5 hour shift in peak load with respect to the specimen and applied temperature condition. The speciments with macroencapsulated PEG showed the most reduction in the inner side temprature and the specimens with two sides cement mortar are better than one side cement mortar thermal performance. Moreover, compressive, tensile and flexural strenghts and water absorption of the specimens including cement mortar were measured. These experiments showed that the increase of Shape-Stabilized Phase Change Materials would reduce mechanical strengths and water absorption in lower ages. Of course, the silica fume compensates the reduction of strengths in higher ages.