The studied building is an energy efficient monozone building, used for experimental works, recently constructed at the Plataforma Solar de Almeria, located in a sub arid Mediterranean climate in South Spain (latitude 37° 03, longitude -2° 23, altitude 404 m) (see Figure 1). The house is free of nearly obstacles and with a clear view in all directions. Its plant area is 32 m2 and its volume is І16 m3. Figure 2 shows the building plant and its orientation.

Figurel: Photograph of the building.

Implemented techniques to reduce the energy demand both in hot and cold seasons are: appropriate orientation, door and windows shading devices designed to obtain shading that reduce solar gain in summer and increase it in winter, double glazed windows, diagonally faced window for natural cross ventilation, ceiling and external walls well insulated, internal thermal inertia with exterior insulation, high ceiling, white outside surface, protection of main wind directions, possibility to use roof surface evaporative cooling system.

The building walls composition are presented in Table 1. The floor and ceiling are described in Figure 3 and 4 respectively

Windows north and south area is 2.25 m2, they have double glass 4/6/4 and aluminium frame. Door, 0.6 пП area, is made from aluminium with a 75 x 75 cm2 double glazed window 4/6/4.