In an effort to keep our house of Merida and our house of Chicxulub Puerto under the 1C requirements by the commission and remain somewhat comfortable, I need to insulate the houses and replace the windows and doors. I want to be able to use air conditioning and remain under the dreaded DAC electricity usage rate.

Being of typical Mexican construction of solid concrete, I am thinking about various ways I can improve the effeciency of my houses, both for increased comfort and lower energy usage. I thought about constructing interior walls of sheetrock over a wood framework and placing fiberglass insulation between the concrete interior walls and the fured-back sheetrock. This will also allow me to add various electrical outlets and related wiring.

Has anyone got ideas of ways to increase the r-value of the Mexican concrete house?