Codes & Standards Research|Market Research & Evaluation Reports
Code Savings Technical Assumptions Review
Products/Technologies
Codes and Standards|Energy Code
Codes and Standards|Energy Code
Market Sectors
Commercial|Commercial Buildings|Natural Gas|New Construction|Residential|Residential Buildings
Commercial|Commercial Buildings|Natural Gas|New Construction|Residential|Residential Buildings
The Northwest Energy Efficiency Alliance (NEEA) contracted with Energy 350 to review three assumptions underlying the savings it reports for updates to energy codes for new construction buildings:
- Is NEEA’s approach for splitting savings from the 2018 Washington State Energy Code – Residential for electric-only homes and homes with both electric and gas reasonable?
- Is NEEA’s approach for aligning savings rates calculated for the residential 2021 International Energy Conservation Code (IECC) with Montana amendments with the 2018 IECC with Montana amendments reasonable?
- Is it reasonable for NEEA to use the commercial 2021 IECC with Montana amendments savings rates for reporting 2024 energy savings given the limited impact of amendments on commercial building energy use?
Energy 350 found that most assumptions NEEA made to adjust code savings analyses were valid. The review team noted several areas where NEEA could improve assumptions either as part of this evaluation or for the next code cycle by refining or updating estimates when new data is available. NEEA intends to accept these recommendations.