The United States Environmental Protection Agency's (USEPA) House Evaluation Program (HEP) is an on-going programme designed to transfer research findings on radon diagnostic and mitigation technologies to the general public. The HEP accomplishes this technology transfer by providing guidance and hands-on training to States, homeowners, and local contractors while conducting radon diagnostics and mitigation design planning in houses. An overview of the HEP is given and the programme's accomplishments and findings to date are discussed.