In modern times, the majority of the world's energy consumption is attributable to the heating and cooling of residential buildings. Because of this, the development of sustainable energy sources has increased dramatically, particularly in residential buildings, with the goal of reducing the amount of energy that is consumed within buildings. An extensive green roof system is one of the most effective ways to save energy. Not only does this lessen the impact that humans have on their surroundings, but it also has positive effects on people's health and the way their homes look. The purpose of this study was to investigate the thermal characteristics of green roofs installed on residential buildings in Qatar's hot and dry climate in order to assess their viability and determine how best to minimize energy usage. In the course of this investigation, five distinct heights ranging from 10 to 50 cm were taken into consideration to assess the energy efficiency of the roof. Of these heights, the height of 10 cm was found to be the most suitable height for planting in this environment. In addition, in order to evaluate the performance of roof energy, five plant leaf area indices with values ranging from one to five have been taken into consideration. Of these, the results indicate that the plant leaf area index is the plant planting index that works best in this environment. The larger the plant's leaves, the more protection they will provide from the sun and the higher the yield will be. In addition, to evaluate the effectiveness of the roof energy system, four height dimensions of 8, 13, 18, and 23 cm were considered for the cultivation layer. According to the findings, the height of the plant substrate layer is 23 cm, and the height of the cultivation layer is 18 cm. The cultivation layer that yields the best results for green roofs in this environment.