The aim of using electromechanical air conditioning in buildings is to maintain thermal comfort for its occupants; however, this type of air conditioning represents 40% of the total energy consumption of a building, generating economic and environmental impacts, because fossil fuels are the main source of energy. To reduce the use of electromechanical conditioning, it is possible to take advantage of the climatic conditions of the region to improve its performance. Due to the small number of works that quantitatively support measures aimed at improving the thermal behavior of houses in an integral way and the growth of mass construction in Mexico, in the present work, a solar chimney is incorporated in a typical type of social interest housing in Guanajuato. The incorporation of the solar chimney was simulated by using computational fluid dynamics (CFD) using ANSYS and evaluated by ASHRAE Standard 55-2017. The selected arrangement induces air flow inside without the need for external flow and obtains speeds of 0.2 m/s; thus, it could be considered for rooms within comfort zones up to an operating temperature of 29 °C according to the ASHRAE Standard 55-2017, PMV method.

Renewable energy sources have been regarded as the best alternative for energy generation because they are environmentally friendly and can be renewed. Among the sources of renewable energy is the photovoltaic system. The generation of energy through clean energies such as photovoltaic systems connected to the grid have shown sustained growth for years in residences, commercial centers, and industry. Therefore, a practical study of a photovoltaic system connected to the grid of a specific industry in the San Juan del Río region was carried out to determine the effectiveness and the cost efficiency of running a photovoltaic system connected to a grid. We also investigated the fastest possible time to get return on investment. The return on investment was estimated using the peak solar hours, numbers of panels, inverter, conductors, and DC and AC protectors. Although, the cost of starting a photovoltaic system can be quite expensive, our analysis revealed that the return on the investment can start to come to effect within a very short period. The policy implication of this is that the government should encourage investment on the photovoltaic system through financial support to firm and other policies that can make delivery cheaper for the customers.