I. Introduction
The world has increased the consumption of energy and in particular, the consumption of electricity. For example, the European reports in 2010 mentioned the increase of global consumption in EU-27 and the domestic consumers represent about 29.70% of the total electricity [1]. On the other hand, the domestic consumers of the United States are responsible for 22.00% of electricity consumption for the year 2011 [2]. Lastly, a study in 2012 about electricity consumption in Brazil shows the domestic consumers responsible for 24.92% of total electricity consumption [3]. Brazil being a country with special conditions, namely, the large territorial extension and the climate differences, the electricity consumption depends directly on the Brazilian regions. Summarized in three regions, the highest percentage of consumption in northern region is for Heating, Ventilating and Air Conditioning (HVAC) and cold domestic equipments. In central-west region, the electric shower is the load with highest impact, the second load is the cold equipment and the third is the HVAC systems. Finally, in the Southern Region, which is discussed in this paper, the highest load consumption is the HVAC systems, followed by electric shower and cold domestic equipment [3].