The U.S. Department of Energy (DOE) supports and participates in the model building energy code development processes administered by the ASHRAE and the International Code Council (ICC). DOE activities include developing and submitting code change proposals, conducting analysis of building energy efficiency and cost savings, and formulating underlying evaluation methodologies. Through participation in model energy code development for both commercial  and residential  buildings, DOE strives to make cost-effective, energy efficient upgrades to current model codes. DOE is currently developing its proposed changes  for the 2018 International Energy Conservation Code (IECC).
DOE activities to improve the energy efficiency of commercial  buildings primarily target the International Energy Conservation Code (IECC) and Standard 90.1.
DOE activities to improve energy efficiency of residential  buildings primarily target the International Energy Conservation Code (IECC).
DOE is required by law (the Energy Conservation and Production Act, as amended (ECPA)) to issue a determination as to whether the latest edition of ASHRAE Standard 90.1 (for commercial and multi-family high-rise residential buildings) or the latest version of the International Energy Conservation Code (for low-rise residential buildings) will improve energy efficiency compared to the previous edition of the corresponding standard or code. DOE has one year to publish a determination in the Federal Register after each new edition of the standard/code is published.
Learn more 
- Energy and Energy Cost Savings Analysis of the 2015 IECC for Commercial Buildings 
- Achieving the 30% Goal: Energy and Cost Savings Analysis of ASHRAE Standard 90.1-2010 
- Cost-effectiveness of ASHRAE Standard 90.1-2010 Compared to ASHRAE Standard 90.1-2007 
- Energy and Energy Cost Savings Analysis of the IECC for Commercial Buildings 
- National Energy and Cost Savings for New Single- and Multifamily Homes 
- State Residential IECC Cost Effectiveness Analysis and Results