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Window-wall ratio (WWR) is a parameter that necessarily affects the energy need for heating, cooling and lighting of buildings. Its definition during the early design process is remarkable to reduce the energy consumption. The aim of the paper is to optimize WWR minimizing global energy consumption in order to obtain Nzeb schools in mediterranean area. From the study it is possible to affirm that WWR exerts a considerable influence on energy consumption for heating and cooling, and to a lesser extent for lighting.