The Illinois Energy Conservation Code requires design and construction professionals to follow the latest published edition of the International Energy Conservation Code (IECC) and the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Standard 90.1 “Energy Standard for Buildings except Low-Rise Residential Buildings” including amendments adopted by the Capital Development Board.

State Funded Facilities must comply with ASHRAE 90.1 per 20 ILCS 3105/10.09-5. See Subpart B of the Illinois Energy Conservation Code for more information.The 2010 edition of ASHRAE 90.1 went into effect on 1/11/13.

Privately Funded Commercial Facilities must comply with IECC per 20 ILCS 3125.See Subpart C of the Illinois Energy Conservation Code for more information. The 2012 edition of the IECC went into effect on 1/11/13.

Residential Buildings must comply with IECC per 20 ILCS 3125. See Subpart D of the Illinois Energy Conservation Code for more information. The 2012 edition of the IECC went into effect on 1/11/13.