This paper presents a novel approach to enhancing the energy and daylight performance of a polyethylene greenhouse located in Larache, Morocco, under Mediterranean climate conditions. The study addresses the challenge of maintaining optimal thermal and lighting environments for tomato cultivation while reducing energy consumption. A particular focus is given to the use of micro-louver technology, a material with a new application in greenhouse systems, employed as an external shading device. To evaluate its impact, thermal simulations were conducted using EnergyPlus software with the graphical interface DesignBuilder software. Three shading strategies were tested: shading on north and south sides, shading on all sides, and roof shading. The simulations accounted for the specific needs of tomato crops, including the required daily solar radiation threshold of 2.34 kWh/m2/day. Among all configurations, roof shading achieved the best performance by balancing energy efficiency with sufficient solar transmission. Based on these results, a refined solution was tested by applying shading only to the central section of the roof, where solar exposure is most intense. This targeted strategy reduced cooling energy demand by approximately 6% compared to the greenhouse without external shading. These findings demonstrate the potential of central roof shading with micro-louvers as an effective passive climate control solution. It offers a sustainable balance between energy performance, daylight access, and material efficiency for greenhouse applications in warm climates.