The Texas State Energy Conservation Office (SECO)adopted the 2015 IECC effective Nov. I, 2016, for all commercial and residential buildings greater than three stories above grade and for state-funded buildings SECO adopted the ASHRAE Standard 90.1-2013, with an effective date of June I, 2016.

For residential buildings, Texas Governor Greg Abbott signed HB 1736 on June 16, 2014 moving the state's single-family residential energy code from the 2009 code to the 2015 International Residential Code (IRC), Chapter 11, effective September I, 2016. The Texas state legislature modified the 2015 IRC Energy Rating Index scores to a set of scaled scores that increases in stringency over time.