The Extreme Heat Economic Study Act of 2025 directs the Under Secretary of Commerce for Oceans and Atmosphere, through NOAA's Climate Program Office, to conduct a comprehensive economic impact study . This study will quantify the financial costs of extreme heat, valuing the loss of life and property, and evaluating broad health impacts like mortality and morbidity, alongside property damage. It will also consider medical assistance expenses, various insurance claims, labor productivity losses, and economic impacts on critical infrastructure and energy costs. To ensure thoroughness, the Under Secretary must solicit feedback from numerous federal agencies and non-federal partners. The study is also mandated to include recommendations for establishing a national system to track healthcare costs, improve heat death reporting accuracy, and measure labor productivity losses. Findings are to be published on the HEAT.gov website within four years, made publicly available, and an appropriation of $3,500,000 is authorized for its execution.