The study addresses the growing imperative to reduce the environmental impact of construction by revisiting earth-based building materials, which offer both sustainability and local resource advantages. Focused on Morocco's unique climate, the research evaluates an innovative thermal insulation method for south-facing walls using eco-friendly materials. Its primary aim is to determine the optimal insulation thickness, crucial for regulating heating and cooling demands in diverse Moroccan climates, and to enhance it through a smart solution. Employing Life Cycle Cost Analysis (LCCA) and Computational Fluid Dynamics (CFD) modeling, the study compares the thermal performance of two wall configurations: ecological insulation alone versus with the integrated smart solution. Findings reveal the optimum insulation thickness, resulting in significant energy savings during both summer and winter. Moreover, the proposed intelligent solution further reduces insulation thickness, leading to energy savings of 3.72 % and 3.68 % respectively in summer and winter, alongside reduced insulation costs. The optimization strategy, maintaining internal temperatures at comfortable levels and modulating air velocity, aims to make substantial contributions towards reducing energy consumption and environmental impact in the construction sector.