The 2015 International Energy Conservation Code updated energy efficiency requirements with stricter standards than the 2012 version. This code version served as the baseline for many states before IECC 2018 adoption and remains in effect in several jurisdictions. It applies comprehensive energy efficiency standards to residential and commercial construction.
Key Requirements
IECC 2015 specifies SEER 13 for air conditioners, AFUE 90% for furnaces, and HSPF 8 for heat pumps in most climate zones. The code requires duct sealing to 10% leakage, improved insulation values, and enhanced window performance with U-factors between 0.30 and 0.57. Air barrier continuity requirements became more stringent than previous editions.
Current Relevance
IECC 2015 remains the minimum code in several states and serves as a reference standard for energy retrofit projects. Many energy consultants reference this version when evaluating older buildings constructed between 2015 and 2018. Understanding IECC 2015 requirements helps contractors assess compliance for properties built during that period.