Insulation in walls and cover.
The insulation is much better than that of any traditional house to avoid on the one hand in winter that between the cold and the heat is lost and on the other in summer that the heat warms the house and that the cold air escapes.
Elimination of thermal bridges
(the boxes of the blinds, pillars on the facade, window frames and windows, etc.) We will avoid heat losses, save on heating costs and avoid the appearance of pathologies by condensation such as mold.
High performance doors and windows.
The passive houses have windows with double or triple glazing installed to contribute to the great thermal and acoustic insulation that characterizes them.