Publications

EnergyPlus TMY3 weather file for climate location associated with the IECC Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the IECC Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the IECC Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the IECC Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the IECC Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the IECC Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the IECC Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the IECC Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the IECC Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the IECC Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the IECC Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the IECC Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the IECC Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the IECC Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the IECC Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the Manufactured Housing Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the Manufactured Housing Prototype Building Models.

EnergyPlus TMY3 weather file for climate location associated with the Manufactured Housing Prototype Building Models.

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.

This report provides an assessment as to whether new buildings constructed to the commercial energy efficiency provisions of the 2021 IECC would save energy and energy costs as compared to the 2018 IECC. The Commercial Energy Efficiency chapter in the 2021 IECC allows users to either follow the provisions in the IECC or use Standard 90.1-2019 as an alternative compliance path. As such, PNNL also compared the energy performance of the 2021 IECC with the corresponding Standard 90.1-2019 to help states and local jurisdictions make informed decisions regarding model code adoption.

This report provides an assessment as to whether new buildings constructed to the commercial energy efficiency provisions of the 2018 IECC would save energy and energy costs as compared to the 2015 IECC. The Commercial Energy Efficiency chapter in the 2018 IECC allows users to either follow the provisions in the IECC or use Standard 90.1-2016 as an alternative compliance path. PNNL also compared the energy performance of the 2018 IECC with the corresponding Standard 90.1-2016 to help states and local jurisdictions make informed decisions regarding model code adoption.

This report provides an assessment as to whether new buildings constructed to the commercial energy efficiency provisions of the 2015 IECC would save energy and energy costs as compared to the 2012 IECC. PNNL also compared the energy performance of the 2015 IECC with the corresponding Standard 90.1-2013. The purpose of this analysis is to help states and local jurisdictions make informed decisions regarding model code adoption.

This spreadsheet contains detailed end-use data results from the Determination Analysis of IECC-Residential 2024 conducted by Pacific Northwest National Laboratory.

PNNL evaluated the cost effectiveness of the changes in the prescriptive and mandatory residential provisions of the 2021 edition of the IECC, compared to those in the 2015 IECC.