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The concept of a ?passive House? has been introduced for the first time in Germany, subsequently being extended and at higher latitudes and different features climatic from those of Germany, in the south, west and south-west of Europe. Passive building has been defined by Wolfgang Feist, Passivhaus Institut, as being the building that demand for heating must not be more than 15 kWh/m? year, and total consumption of primary energy should not be more than 120 kWh/m? year. In this paper we strive to study at the conc...