## 1 Introduction
### Calculation of the Residential Energy Use  
In order to develop the program of calculation of the electricity use of the Mexican residential sector, an analysis of this use should be applied. This analysis has the purpose of showing the main energy activities in Mexican dwellings and their share of total energy usage. Also, it has the objective of breaking down the two main approaches of energy saving that can be applied by the occupants of the Mexican dwellings (use of low-energy devices and reduce of the time of usage). The national electricity use in the Mexican residential sector in 2015 was 54.60 TWh [31]. In the same year, a total of 31.37 million of occupied dwellings was estimated by the Mexican National Council of Housing (CONAVI, initials in Spanish) [32]. Therefore, an average daily use of 4.76 kWh/dwelling is calculated in Mexico for the same year. Regarding the characteristics of the households, according to CONAVI, 82% of the Mexican dwellings have a combination of walls-roof of brick-concrete, respectively, whereas the remaining 18% have construction materials such as clay tile & corrugated roofs for the roofs, and adobe as well as \begin{table}
\begin{tabular}{c c} \hline \hline
**Climatic Region** & **Distribution of Population** \\ \hline \hline   Arid & 21.9\% \\ Dry Tropics & 12.0\% \\ Temperate & 53.7\% \\ Humid Tropics & 12.4\% \\
**Total** & **100.0\%** \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Number of air-conditioned dwellings gathered by climatic region. Figure 2: Monthly average temperature (Temp) and relative humidity (RH) for the four main climates in Mexico. wood for the walls. Concerning the size of the buildings, 10.6% have a built area of 45 m\({}^{2}\) or less, 46.9% have an area between 45 and 100 m\({}^{2}\), and 42.5% are bigger than 100 m\({}^{2}\). Also, it is stated that in 22.6% of the dwellings live 1 to 2 persons, in 57.3% live 3 to 5 people, 16.6% of the households have 6 to 8 occupants, and 3.5% have more than 9 users [32]. Furthermore, according to the Mexican National Council of Efficient Use of Energy (CONUEE, initials in Spanish), the most important activities related to the energy use (electrical and thermal) within a regular air-conditioned household are the following: air-conditioning systems (only cooling), illumination, including street lights where are close by the dwellings (nevertheless, there is not sufficient information concerning how the Mexican Federal Commission of Electricity considers \"close by the dwellings\" [33]) & appliances, stove, water & space heating, and refrigeration [33]. It is worthy to mention that illumination & appliances include street lights, televisions, washing machines, lamps, microwave ovens, computers etc. Nonetheless, to the best of our knowledge, there is no further analysis of the use of these devices. On the other hand, for not air-conditioned dwellings the activities are presented as follows: Illumination & appliances, stove & water heating, and refrigeration. It is important to mention that the stove, water heating & space heating are considered as mostly gas-based activities (thermal energy) in Mexico by the CONUEE. Thereby, the share of total of the energy use are shown in Table 2.  
In the study by the CONUEE, space heating represents a very small share of the thermal energy use. Nevertheless, space cooling seems to be a large share of the electricity use. Thereby, for the same year 2015, Orpeza-Perez calculated a use of 11.92 TWh for air-conditioning systems within the residential sector, considering a total of 6.93 million of air-conditioned dwellings [34]. Thus, an average daily use of 4.66 kWh/dwelling is estimated. In the same year, the CONUEE calculated a share of 21% of the total electricity use in the residential sector for air-conditioning. If this is considered for this study, a use of 11.58 TWh is estimated, therefore the analysis can be considered as valid.