In this study, the effectiveness of an eggcrate sun shading device in lowering solar radiation transmission and enhancing temperature conditions in tropical climates is examined. A test room with an eggcrate shading device and a control room without shading were compared in the study. Key parameters, including solar radiation transmission, external and internal surface temperatures of walls and windows, and indoor air temperature, were measured and analysed. The findings show that the eggcrate shading device dramatically lowers heat gain, especially during peak solar hours, by reducing solar radiation transmission by an average of 58%. Furthermore, the shading device improved thermal comfort during peak hours by lowering indoor air temperatures by roughly 1.3 ℃ and external and internal surface temperatures of windows and walls by up to 5.7 ℃. The results validate the potential of eggcrate shading devices as a passive cooling method that can enhance energy efficiency and lessen the need for mechanical cooling systems in tropical buildings. The study emphasizes the device’s contribution to sustainable building practices and recommends more research on how to optimize its design for wider architectural uses.