IECC Energy Codes

The International Energy Conservation Code (IECC) is the model energy code adopted by most states and jurisdictions across the United States. Home Energy Rx provides independent testing and verification for compliance with the IECC for new residential construction.

What is the IECC?

The IECC establishes minimum requirements for energy-efficient design and construction of new buildings. It is updated on a three-year cycle and covers the building envelope (insulation, windows, air sealing), mechanical systems (heating, cooling, ventilation), service water heating, and lighting. Compliance can be demonstrated through a prescriptive path, a performance path, or an Energy Rating Index (ERI) path using a HERS rating.

Our Role

Home Energy Rx performs the inspections and diagnostic testing required to verify IECC compliance. Our certified raters and verifiers conduct blower door tests for building envelope air tightness and duct leakage tests for HVAC distribution systems. We provide the documentation and certificates needed to demonstrate compliance to the local building department.

Why It Matters

IECC compliance ensures that new homes meet a baseline level of energy efficiency, reducing utility costs for homeowners and lowering the environmental impact of residential construction. Many utility rebate programs and certification systems — including ENERGY STAR and HERS ratings — use the IECC as their baseline reference.