
New research sponsored by NAIMA and conducted by ICF Consulting shows that 89 percent of U.S. single-family homes are under-insulated, decreasing comfort while increasing energy costs for homeowners.
Using the 2012 IECC as the baseline for home energy efficiency level, ICF used the National Renewable Energy Laboratory (NREL) 2024 ResStock database to extrapolate a sample of 1 million U.S. homes for this study. All homes that met energy efficiency targets less stringent than the 2012 IECC were deemed under-insulated.
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