This study presents a two-dimensional model with a real size home composed of two-storey (ground and first floor spaces) separated by a slab, enveloped by a wall with rectangular section containing phase change material in order to minimize energy consumption in the buildings. The main objective of the phase change material-wall system is to decrease the temperature change from outdoor space before it reaches the indoor space during the daytime. The numerical approach uses effective heat capacity C eff model with realistic outdoor climatic conditions of Tlemcen city, Algeria. The numerical results showed that by using phase change material in wall as energy storage components may reduce the room temperature by about 6 to 7 °C of temperature depending on the floor level (first floor spaces or ground floor spaces).

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