The research investigates the impact of the solar radiation and the thermal performance of the most common construction systems in Mexico, mainly on masonry and concrete structures. Walls might not have a great impact on the thermal comfort; however they represent more surface area than roof. So, more heat losses can be present on this construction element. Moreover, walls are considered important in non-residential buildings because they are present in all the floors and affect them in the slightly same forms, while roofs will just influence the upper floor. Based on that heat gains or losses on walls at hot and humid locations are important and therefore, selected for this study. The investigation is done through virtual simulation on EDSL TAS and comparisons in Excel on graphics and tables. It shows the impact on the different construction methods in walls and their performance. Then, a selection of the better performance wall is made and improvements are proposed to achieve even a better thermal indoor comfort based on the operative temperatures. Improvements are based on recommendations made by the Mexican government and programmes such as “Hipoteca verde” (Green Mortgage) by the INFONAVIT and material analysis and research made by other Mexican private institutions. Results show that hollow bricks are the most appropriate masonry to be used; additionally the use of 1” polystyrene and lime added on the plasterwork will result on improving the most common method.