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Previous Determinations

Commercial Determinations

ANSI/ASHRAE/IES Standard 90.1-2016

On February 27, 2018, DOE issued a determination that Standard 90.1-2016 would achieve greater energy efficiency in buildings subject to the code.

Supporting Analysis

A technical analysis was performed in support of the Standard 90.1-2016 Determination.


ANSI/ASHRAE/IES Standard 90.1-2013

On September 26, 2014, DOE issued a determination that Standard 90.1-2013 would achieve greater energy efficiency in buildings subject to the code.

Supporting Analysis

A qualitative analysis and quantitative analysis was performed in support of the Standard 90.1-2013 Determination.


ANSI/ASHRAE/IES Standard 90.1-2010

On October 19, 2011, DOE issued a determination that Standard 90.1-2010 would achieve greater energy efficiency in buildings subject to the code.

Supporting Analysis

A qualitative analysis and quantitative analysis was performed in support of the Standard 90.1-2010 Determination.


ANSI/ASHRAE/IESNA Standard 90.1-2007

On July 20, 2011, DOE issued a determination that Standard 90.1-2007 would achieve greater energy efficiency in buildings subject to the code.

Supporting Analysis

A qualitative analysis and quantitative analysis was performed in support of the Standard 90.1-2007 Determination.


ANSI/ASHRAE/IESNA Standard 90.1-2004

On December 30, 2008, DOE issued a determination that Standard 90.1-2004 would achieve greater energy efficiency in buildings subject to the code.

Supporting Analysis

A qualitative analysis and quantitative analysis was performed in support of the Standard 90.1-2004 Determination.


ANSI/ASHRAE/IESNA Standard 90.1-1999

On July 15, 2002, DOE issued a determination that Standard 90.1-1999 would achieve greater energy efficiency in buildings subject to the code.

Supporting Analysis

A qualitative analysis and quantitative analysis was performed in support of the Standard 90.1-1999 Determination.

Residential Determinations

2018 IECC

On December 10, 2019, DOE issued a determination that the 2018 IECC would achieve greater energy efficiency in buildings subject to the code.

Supporting Analysis

A technical analysis was performed in support of the 2018 IECC Determination.


2015 IECC

On June 11, 2015, DOE issued a determination that the 2015 IECC would achieve greater energy efficiency in buildings subject to the code.

Supporting Analysis

A technical analysis was performed in support of the 2015 IECC Determination.


2012 IECC

On May 17, 2012, DOE issued a determination that the 2012 IECC would achieve greater energy efficiency in residential buildings subject to the code.


2009 IECC

On July 19, 2011, DOE issued a determination that the 2009 IECC would achieve greater energy efficiency in residential buildings subject to the code.


2006 IECC

On July 19, 2011, DOE issued a determination that the 2006 IECC would achieve greater energy efficiency in residential buildings subject to the code.