Commercial Determinations

DOE Determinations in Progress

ANSI/ASHRAE/IESNA Standard 90.1-2007 - Under analysis at DOE

DOE is currently analyzing ANSI/ASHRAE/IESNA Standard 90.1-2007. DOE will be using a new methodology for this analysis and will be holding a public meeting on this new analysis methodology in 2008 to allow for public comment.

ANSI/ASHRAE/IESNA Standard 90.1-2004 - Under review at DOE

DOE is currently assessing whether the ANSI/ASHRAE/IESNA Standard 90.1-2004 would achieve greater efficiency compared to the ASHRAE/IESNA Standard 90.1-1999. This determination will also include discussion of ANSI/ASHRAE/IESNA Standard 90.1-2001. DOE has decided to not issue a separate determination for this Standard.

Current DOE Determination

ANSI/ASHRAE/IESNA Standard 90.1-1999 - Affirmative determinination on July 15, 2002

On July 15, 2002, DOE issued a determination that Standard 90.1-1999 would improve commercial building energy efficiency by comparing it to Standard 90.1-1989. View the news release announcing the determination, or the complete determination notice that appeared in the Federal Register on July 15, 2002. (PDF 151 KB). Download Acrobat Reader.

State Certification

Certifications or Requests for Extension of Deadlines, with regard to Standard 90.1-1999, were due at DOE on or before July 15, 2004.

As required by the Act, all states have two years to adopt Standard 90.1-1999 or upgrade their existing commercial building codes to meet or exceed its requirements.

The Process

Background information on the determination process is also available.

Determinations History

ASHRAE/IESNA Standard 90.1-1999 is the only formal determination that DOE has released.

Quantitative Analysis:

A quantitative analysis of the estimated differences between the 1989 and 1999 editions of Standard 90.1 has been performed to inform and support the final determination. An Excel spreadsheet containing the analysis can be downloaded at no cost (ZIP 5.8 MB). Download Zip Application.

An Explanation of the Analysis and Spreadsheet is available to assist in understanding the analysis.

Detailed Textual Analysis:

A Detailed Textual Analysis of the estimated differences between the 1989 and 1999 editions of Standard 90.1 has been performed to inform and support the final determination (PDF 87 KB). Download Acrobat Reader.