The research paper provides an in-depth analysis of energy-efficient building practices in Erbil City, specifically for residential houses. It delves into current energy use patterns and introduces green building techniques such as improved wall insulation, the installation of shading devices, the use of green roofs, the adoption of LED lighting, and the integration of photovoltaic panels. The study employs advanced simulation tools, DesignBuilder and EnergyPlus, to evaluate the impact of these green strategies on reducing energy consumption and CO2 emissions while also improving the living comfort of inhabitants. The results demonstrate a substantial decrease in energy usage and CO2 emissions, offering a detailed comparison of the effectiveness of various green building techniques in a hot, semi-arid climate. The paper concludes with practical recommendations for the application of these strategies in similar climatic conditions, highlighting their importance in addressing energy scarcity and environmental sustainability issues.