The main objective of this study is to provide more data on the use of natural pozzolan located in the region of Beni-Saf west of Algeria as a substitute for cement mortars made with different percentages of pozzolan. We also analysed the effectiveness of the addition of natural pozzolan on the thermal properties of the mortar. To do this, the measuring instruments were installed in order to quantify the overall interior environment and particularly the thermal environment. Since the thermal environment is characterized by physical quantities; the air temperature, the wall temperature and the air humidity, this allows assessing the level of the energy consumption and thermal behaviour of the envelope of the structure to verify the conformity of housing for thermal comfort requirements. The building's energy efficiency improvement approach must be thought globally, which not only focus both on the frame (building materials), but also on the equipment and component systems. In order for the process to be completed, it should also incorporate the use of renewable energies. The regulation is handled by robots that are more or less complex according to the requirements of the initial specifications and the type of individual housing construction, collective or tertiary. These controllers can process the measurement information (temperature, humidity ..) and status (on / off ...) of heating, cooling and lighting to adjust, optimize, secure and counting consumed energy. To improve thermal comfort in a building and save energy, it is necessary to implement special performance materials, providing good thermal insulation.