How waste heat from GPU servers can be recovered to heat buildings is no longer theory—it’s a practical path to decarbonise heat in 2025. With AI clusters now running at high duty cycles and embracing liquid cooling, the “waste” heat they produce can be captured, lifted in temperature if needed, and reused in space heating, domestic hot water, or district heating. In this guide, we explain the end-to-end chain—capture, upgrade, distribute—plus engineering, KPIs, and how Score