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                                                        2012 INTERNATIONAL ENERGY CONSERVATION CODE (IECC)
​​​The map here (above) shows the primary building envelope requirements for all residential buildings in the 2012 IECC. The International Energy Conservation Code sets requirements for the “effective use of energy” in all buildings. Certain buildings that have very low energy use (such as buildings with no heating or cooling) are exempt. The code applies to new buildings and to remodels, renovations, and additions to buildings.

The IECC is typically published every three years, though there are some exceptions. In the last two decades, full editions of the IECC came out in 1998, 2000, 2003, 2006, 2009, 2012, and 2015.

Though there were changes in each edition of the IECC from the previous one, the IECC can be categorized into two general eras: 2003 and before, and 2004 and after. This is because the residential portion of the IECC was heavily revised in 2004.

​​The climate zones were completely revised (reduced from 17 zones to 8 primary zones in 2004) (with three of the eight zones in Texas - 2, 3 and 4) and the building envelope requirements were restructured into a different format.