In Algeria, the buildings are responsible for over 40% of the total energy consumption. Following the current global warming impacts and economic crisis, Algeria has adopted an ambitious program to promote the renewable energy applications, including the integration of energy consumption optimal methods, in the buildings. This paper investigates the impact of the thickness of the massive layer of the soil in building, since,the thermal conductivity of the soil has a significant impact on the

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... ting requirements of buildings. The increase in thermal through the ground is proportional to the thermal conductivity. The heat absorbed in the soil will be returned to the atmosphere when its temperature is lower than the ground temperature. The magnitude of this passive refreshment is dependent on thermal properties of the soil. The obtained results improved improves the modeling of the heat transfer between the building and the ground. Ideally, 3D-modeling through the Type 49 (a TRNSYS subroutine) was used to model the vertical and horizontal distribution of the earth's temperature.