The present analysis evaluates the cost-effectiveness of the latest 2015 edition of the IECC published in June 2014 (ICC 2014), over the 2012 Utah State Energy Code for the state of Utah1. The scope of work is limited to one- and two-family dwelling units, town-homes, and low-rise multifamily residential buildings covered by the residential provisions of the 2015 IECC. The new Energy Rating Index (ERI) path included in the 2015 IECC is not in the scope of this analysis due to the large variation in building configurations it allows
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Moving to the ANSI/ASHRAE/IES Standard 90.1‐2013 version from the Base Code (90.1‐2010) is cost‐effective overall for the combined commercial buildings in the State of Utah.