This study examines sustainable cooling to achieve net zero buildings in Vietnam, focusing on primary energy consumption in commercial buildings. The main objective is to analyze and evaluate energy use, identify potential savings, and propose effective solutions by means of numerical simulation. The study considers factors that affect energy consumption, including HVAC systems, lighting, and equipment. Data is collected from office buildings, hotels, and shopping malls in major cities to model and estimate energy consumption. Cost analysis has been also carried out in the study. Finally, the energy reduction scenarios, such as the use of renewable energy, high-efficiency cooling systems and passive cooling are recommended to achieve the net zero goal.