Publications

Zip file of EnergyPlus TMY3 weather files for 17 climate locations associated with the ASHRAE Standard 90.1 Prototype Building Models. 

EnergyPlus TMY3 weather file for climate location associated with the ASHRAE Standard 90.1 Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the ASHRAE Standard 90.1 Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the ASHRAE Standard 90.1 Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the ASHRAE Standard 90.1 Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the ASHRAE Standard 90.1 Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the ASHRAE Standard 90.1 Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the ASHRAE Standard 90.1 Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the ASHRAE Standard 90.1 Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the ASHRAE Standard 90.1 Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the ASHRAE Standard 90.1 Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the ASHRAE Standard 90.1 Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the ASHRAE Standard 90.1 Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the ASHRAE Standard 90.1 Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the ASHRAE Standard 90.1 Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the ASHRAE Standard 90.1 Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the ASHRAE Standard 90.1 Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the ASHRAE Standard 90.1 Prototype Building Models.

To meet the statutory requirement, DOE conducted an analysis to quantify the expected energy savings associated with Standard 90.1-2019. This report documents the methodology used to conduct the analysis. Based on the analysis, DOE preliminarily determined that the 2019 edition of the ANSI/ASHRAE/IES Standard 90.1 would improve overall energy efficiency in buildings subject to the code (compared to the 2016 edition of Standard 90.1). This report represents the final version of the analysis supporting DOE’s determination on Standard 90.1-2019.

Technical analysis performed in support of the Standard 90.1-2016 Determination.

To meet statutory requirements, DOE conducted an analysis to quantify the expected energy savings associated with Standard 90.1-2016. This report documents the methodology used to conduct the analysis. Based on the analysis, DOE has determined that the 2016 edition of the ANSI/ASHRAE/IES Standard 90.1 would improve overall energy efficiency in buildings subject to the code compared to the 2013 edition of Standard 90.1.

Section 304(a) of the Energy Conservation and Production Act, as amended, directs the U.S. Secretary of Energy to review the International Energy Conservation Code (IECC)1 and make a determination as to whether updated editions would improve energy efficiency in residential buildings. The IECC is developed by the International Code Council (ICC) through an established industry review and consensus process with updated editions typically published every 3 years. The U.S. Department of Energy (DOE) reviews the energy saving impacts of updated code editions and publishes its findings in the Federal Register. The DOE determination and accompanying technical analysis serve as useful guidance to state and local governments as they review and update their building codes. 

The most recent edition, the 2024 IECC, was published in August 2024, triggering the DOE review and determination process.2 DOE and Pacific Northwest National Laboratory (PNNL) conducted a technical analysis to determine energy savings for the 2024 IECC (ICC 2024) residential provisions relative to the previous edition, the 2021 IECC (ICC 2021). This report documents the methodology used to conduct the analysis and summarizes the results. 

The most recent edition, the 2021 IECC, was published on January 29, 2021, triggering the DOE review and determination process. DOE and Pacific Northwest National Laboratory (PNNL) conducted a technical analysis to determine energy savings for the 2021 IECC residential provisions relative to the previous edition, the 2018 IECC (ICC 2017). This report documents the methodology used to conduct the analysis and summarizes the results.

Technical analysis in support of the 2018 IECC Determination.