Oman is facing a problem with using excessive energy. This research used the courtyard as a passive cooling strategy to reduce energy consumption in the building. This research aims to find the most suitable courtyard design under different climates of Oman that enhance the energy consumption of the conventional house in Oman. The design selection would be based on shading and the potential of natural ventilation. First, many field surveys were conducted to investigate the nature of courtyards and have a background about their role in the house. Also, to support the work related to solar radiation and air movement inside the courtyard. Many different courtyard cases were simulated in the DesignBuilder program to get the results of the internal walls' solar radiation heat gain. Then, the gallery was added to enhance its role in reducing the solar radiation on the courtyard's internal walls. After that, the courtyard house was attached to other houses from different sides and orientations to get the best results in reducing solar radiation. The best courtyard was simulated in the Omani conventional house to find the solar radiation reduction and power-saving percentage. Then, the different airflow modes of the courtyards were simulated using CFD to find the best location of windows to predict the effect of the courtyard on natural ventilation potential in the house. It was found that the best shape and flow of the courtyard is the skimming flow courtyard in the hot climate of Oman. The thesis shows that adding a courtyard with a gallery and urban context reduces the energy consumption for a conventional house in a hot-humid climate by about eighty-four percent. For the hot-dry and Tropical climates, adding a courtyard to a conventional house saves about fifty-one percent and sixty-three percent, respectively.