The National Residential Efficiency Measures Database is a publicly available, centralized resource of residential building efficiency measures and costs for the U.S. building industry.

With support from the U.S. Department of Energy, NREL developed this tool to help users determine the most cost-effective measures for improving energy efficiency of existing homes. Learn more about the database.

By accessing the database, the user agrees to the terms and conditions of use.

Version 4.0.0, published April 3, 2025