Creates a coordinated federal system to reduce heat-related illness and deaths by establishing an interagency committee and a NOAA‑based National Integrated Heat Health Information System that delivers heat data, forecasts, tools, and research. It requires open access to system data and metadata, assigns archival stewardship and warning-coordination staff, mandates a 5-year strategic plan, and authorizes $5 million per year for NOAA from FY2025–2029 to support the work.