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, providing critical information during state and local adoption processes. The following national analyses are currently available:
Commercial
- National Cost Effectiveness of Standard 90.1-2022
- National Cost Effectiveness of Standard 90.1-2022 Workbook
- National Cost Effectiveness of Standard 90.1-2019
- National Cost Effectiveness of Standard 90.1-2019 Workbook
- National Cost Effectiveness of Standard 90.1-2016
- National Cost Effectiveness of Standard 90.1-2016 Workbook
- Energy and Energy Cost Savings Analysis of the 2021 IECC for Commercial Buildings
- Energy and Energy Cost Savings Analysis of the 2018 IECC for Commercial Buildings
Residential
- National Cost Effectiveness of the 2024 IECC
- National Cost Effectiveness of the 2021 IECC
- National Cost Effectiveness of the 2018 IECC
- HERS Index Values Corresponding to the IECC
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 state analyses are currently available:
State Cost-effectiveness Analysis Reports
*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 and money. These state fact sheets provide an overview of the expected benefits to homeowners and building owners.
*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 and money. These local fact sheets provide an overview of the expected benefits to homeowners and building owners.