الفهرس 
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Abstract
Building energy consumption reached 40% of the world’s total energy. This may be due to design the building without regard to the climatic and environmental aspects surrounding it. This research focuses on the relationship between the thermal performance of the building and its shape. The research focused on the hot climates of the Arab world (hot-dry, hot-humid). The simulation was carried out using the Design Builder program in two cities, Jeddah, Saudi Arabia (which represents a hot-dry climate), the other city is Port Said, Egypt (which represents a hot-humid climate). Several forms are compared and these shapes are circle, square, rectangular with different proportions, L shape, U shape, and courtyard. Results in each climate:
In hot-dry climates: 1) The courtyard form helped in saving 53% of the energy after reducing the outside openings and increasing the openings in the court and providing the patio with internal arcades. 2) Directing the building to the north or south provides 10% of the energy. 3) When the percentage of the opening was 10% provided 44% of the energy. In hot-humid climate: 1) The square form has the best thermal performance as it provides about 46.5% of the energy. 2) Directing the building at an angle of 20º to the east/west or directing it to the north/south. 3) When the percentage of the opening was 10% provided 44.6% of the energy.