Determinations

ANSI/ASHRAE/IES Standard 90.1-2013

On September 18, 2014, DOE announced its determination that Standard 90.1-2013 would achieve greater energy efficiency in buildings subject to the code. DOE estimates national savings in commercial buildings of approximately:

  • 8.7% energy cost savings
  • 8.5% source energy savings
  • 7.6% site energy savings

A notice will be published in the Federal Register issuing the affirmative determination. A docket was also previously established to accept public comments related to this action.

State Certification

Upon publication of an affirmative determination, States are required to certify that they have reviewed the provisions of their commercial building code regarding energy efficiency, and, as necessary, updated their codes to meet or exceed the updated edition of Standard 90.1. Additionally, DOE provides guidance to States on submitting certification statements and requests for deadline extensions. State certifications for Standard 90.1-2013 must be submitted by the date identified in the official Federal Register notice.

Supporting Analysis

DOE conducted a qualitative analysis and quantitative analysis in support of its determination. These analyses assess Standard 90.1 compared to the previous edition, and estimate the anticipated energy consumption of buildings that would be required to meet the updated Standard.


With each new edition of ANSI/ASHRAE/IES Standard 90.1, DOE is required by statute to issue a determination as to whether the updated edition will improve energy efficiency in commercial buildings. (42 U.S.C. 6833)

Commercial Buildings

(2)(A) Whenever the provisions of ASHRAE Standard 90.1-1989 (or any successor standard) regarding energy efficiency in commercial buildings are revised, the [DOE] Secretary shall, not later than 12 months after the date of such revision, determine whether such revision will improve energy efficiency in commercial buildings. The [DOE] Secretary shall publish a notice of such determination in the Federal Register.

(B)(i) If the [DOE] Secretary makes an affirmative determination under subparagraph (A), each State shall, not later than 2 years after the date of the publication of such determination, certify that it has reviewed and updated the provisions of its commercial building code regarding energy efficiency in accordance with the revised standard for which such determination was made. Such certification shall include a demonstration that the provisions of such State's commercial building code regarding energy efficiency meet or exceed such revised standard.

(ii) If the [DOE] Secretary makes a determination under subparagraph (A) that such revised standard will not improve energy efficiency in commercial buildings, State commercial building code provisions regarding energy efficiency shall meet or exceed ASHRAE Standard 90.1-1989, or if such standard has been revised, the last revised standard for which the [DOE] Secretary has made an affirmative determination under subparagraph (A).

DOE typically performs a combination of qualitative analysis (i.e., comparison of individual code provisions) and quantitative analysis (i.e., whole-building simulation) in support of its determinations. The outcome of this analysis supports a determination as to whether new provisions improve building energy efficiency, as would be regulated by the updated code.

2015 International Energy Conservation Code

On September 18, 2014, DOE announced a Preliminary Determination that the 2015 International Energy Conservation Code (IECC) would achieve greater energy efficiency in buildings subject to the code. Preliminary analysis estimates national energy savings of approximately 1.12% of residential building energy consumption. A docket will be established to accept public comments related to this action, and feedback is requested within 30 days of official publication in the Federal Register.

State Certification

If this determination is finalized, States would be required to certify that it has reviewed the provisions of its residential building code regarding energy efficiency, and made a determination as to whether it is appropriate for such State to revise its code to meet or exceed the updated edition of the IECC. Additionally, DOE provides guidance to States on submitting certification statements and requests for deadline extensions.

Supporting Analysis

DOE published a technical analysis in support of its preliminary determination. This analysis assesses the updated IECC compared to the previous edition, and estimates the anticipated energy consumption of buildings that would be required to meet the code.


With each new edition of the IECC, DOE is required by statute to issue a determination as to whether the updated edition will improve energy efficiency in residential buildings. (42 U.S.C. 6833)

Residential Buildings

(5)(A) Whenever the CABO Model Energy Code*, 1992, (or any successor of such code) is revised, the [DOE] Secretary shall, not later than 12 months after such revision, determine whether such revision would improve energy efficiency in residential buildings. The [DOE] Secretary shall publish notice of such determination in the Federal Register.

(B) If the [DOE] Secretary makes an affirmative determination under subparagraph (A), each State shall, not later than 2 years after the date of the publication of such determination, certify that it has reviewed the provisions of its residential building code regarding energy efficiency and made a determination as to whether it is appropriate for such State to revise such residential building code provisions to meet or exceed the revised code for which the [DOE] Secretary made such determination.

*As a predecessor to the ICC, the Council of American Building Officials (CABO) was responsible for development of the Model Energy Code (MEC). Contemporary energy codes are referred to and published as the International Energy Conservation Code (IECC)®.

DOE typically performs a combination of qualitative analysis (i.e., comparison of individual code provisions) and quantitative analysis (i.e., whole-building simulation) in support of its determinations. The outcome of this analysis supports a determination as to whether new provisions improve building energy efficiency, as would be regulated by the updated code.

Previous DOE determinations surrounding building energy codes are available for reference by states and local governments, as well as other interested stakeholders.