In the building industry, which is a major contributor to carbon emissions, there is an increasing need for strategies that minimize environmental impacts and enhance energy efficiency. Among other possibilities, the focus on construction components with dynamic performance, particularly in the external envelope (opaque and translucent), is a promising trend namely in the scope of a growing sector of prefabrication. This study explores the application of dynamic ventilated façades in low thermal inertia Light Steel Frame (LSF) construction systems, aiming to mitigate overheating and enhance the thermal and energy efficiency of buildings. To achieve these objectives, a ventilated façade was developed that integrates the geometric optimization of air passage openings (slits) to maximize natural ventilation and reduce recirculation zones and thermal bridges. The evaluation of thermal performance was carried out through Conjugate Heat Transfer (CHT) numerical simulations, comparing the proposed solution with a conventional ventilated façade configuration. The results demonstrated that the proposed dynamic ventilated façade provided an internal temperature reduction of up to 2–3 °C, maintaining the environment below 26 °C, while the conventional system stabilized the temperature around 28 °C. These findings highlight the potential of the strategy to improve thermal comfort and energy efficiency in low inertia buildings, contributing to more sustainable developments in the construction industry.