National and State Analysis

National Analysis

Pacific Northwest National Laboratory (PNNL) assesses recent editions of the model codes to quantify the associated energy & cost savings. This analysis confirms the cost-effectiveness of updated editions of the model codes across U.S. climate zones, and is of interest to policymakers, as well as adopting states & localities. The following national analyses are currently available:

Commercial

Residential

State Analysis

Pacific Northwest National Laboratory (PNNL) assesses recent editions of the model codes to quantify the associated energy & cost savings. These analyses take into account varying state-level conditions, such as incremental costs, utility rates, climatic conditions and construction trends. The residential analyses are customized based on current state energy codes. The following national analyses are currently available:

State Cost-effectiveness Analysis Reports

State Commercial Residential
Alabama

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Alaska

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Arizona

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Arkansas

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

California*    
Colorado

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Connecticut

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Delaware

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

District of Columbia

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Florida

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Georgia

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Hawaii

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2015 IECC

Idaho

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Illinois

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2015 IECC

Indiana

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Iowa

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Kansas

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Kentucky

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Louisiana

ASHRAE 90.1-2019
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Maine

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Maryland

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2015 IECC

Massachusetts

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Michigan

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Minnesota

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Mississippi

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Missouri

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Montana

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Nebraska

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Nevada

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2015 IECC

New Hampshire

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

New Jersey

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

New Mexico

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

New York

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

North Carolina

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

North Dakota

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Ohio

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2015 IECC

Oklahoma

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Oregon*    
Pennsylvania

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Rhode Island

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

South Carolina

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

South Dakota

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Tennessee

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Texas

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Utah

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Vermont

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Virginia

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Washington*    
West Virginia

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

Wisconsin

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013*

2021 IECC
2018 IECC
2015 IECC

Wyoming

ASHRAE 90.1-2019
ASHRAE 90.1-2016
ASHRAE 90.1-2013

2021 IECC
2018 IECC
2015 IECC

*Deviates from model codes

State Fact Sheets

Adopting the 2021 IECC for residential buildings and ASHRAE Standard 90.1-2019 for commercial buildings will save energy, money, and mitigate the effects of climate change. These state fact sheets provide an overview of the expected savings to homeowners and building owners.

Alabama Louisiana Ohio
Alaska Maine Oklahoma
Arizona Maryland Oregon
Arkansas Massachusetts Pennsylvania
California* Michigan Rhode Island
Colorado Minnesota South Carolina
Connecticut Mississippi South Dakota
Delaware Missouri Tennessee
Florida Montana Texas
Georgia Nebraska Utah
Hawaii Nevada Vermont
Idaho New Hampshire Virginia
Illinois New Jersey Washington*
Indiana New Mexico Washington, DC
Iowa New York West Virginia
Kansas North Carolina Wisconsin
Kentucky North Dakota Wyoming

*Deviates from model codes

Local Fact Sheets

Adopting the 2021 IECC for residential buildings and ASHRAE Standard 90.1-2019 for commercial buildings will save energy, money, and mitigate the effects of climate change. These local fact sheets provide an overview of the expected savings to homeowners and building owners.

Atlanta Des Moines Miami
Baltimore Grand Rapids Minneapolis
Baton Rouge Houston Oklahoma City
Birmingham Las Vegas Pittsburgh
Boise Lexington Richmond
Columbia Little Rock Salt Lake City
Columbus Madison