H.R. 10839 — Heat Island Reduction Act

This section requires the head of each federal agency to develop a heat island reduction plan within 6 months for its properties and facilities located in ozone nonattainment areas. It further requires submission of detailed implementation plans to the General Services Administrator within 180 days, updates every 2 years, prioritization of cost-effective measures, and annual GSA reports to Congress on agency progress, covered properties, measures taken, and barriers.