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A ground roof is a sustainable element in which using a certain thickness of ground can reach the desired thermal and climatic comfort. On the northwestern border of Mexico, with an emphasis on desert areas, there is a need to compose solutions that measure the heat gain problems caused by climatic conditions. The heat gain is caused mainly by solar rays that occur in summer; the ground roof creates an insulating layer which helps to reduce the flow of heat, which in turn with the volume of ground helps maintain and lower stable temperatures. To evaluate the thermal performance of a ground roof, with the weather conditions of the metropolitan area of Mexicali, the simulation will be carried out. The ground roof are analyzed with different ground thicknesses and measurement periods are established, according to the specifications in standards ASTMC-1046-95, ASTMC1155-95. The thicknesses were simulated with the Ener-Habitat program. In the results it has been obtained that in a concrete cover the temperatures will be higher in contrast to the temperature of the environment and that of the ground roof.

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Natural ventilation was analysed in a low-income dwelling to control open or closed windows according to a dynamic simulation process in sub-humid warm climate. A selective algorithm to control natural ventilation was determined in an annual period per hour with the following findings: a) an algorithm to select open or closed windows was determined, b) comfort hours per year were evidenced with open, closed windows and selective algorithm to operate natural ventilation, and c) the schedule and periods of ventilation control were presented. Meteonorm® data were used on an hourly basis in Design Builder® simulations and the Meteorological System data based on 30 years of measurements were used to determine the comfort range. Conclusions: the potential benefits to be obtained by applying this ventilation strategy with a selective algorithm are observed in sub-humid warm climate.