MELT-Ing makes lightweight school buildings climate-resilient: the MELT Plate is only 1.2 cm thin, filled with phase-change material, and buffers heat like 25 cm of concrete—entirely without electricity, sensors, or maintenance. In a Bundeswehr pilot project, it reduced hot days by 84%, fully passive. For school authorities, this means stable, healthy classroom temperatures for better learning, significantly lower operating costs than air conditioning (up to €28,000 over 15 years), and 90% less CO2 than comparable concrete thermal mass. Easy to integrate between load-bearing beams—both in new builds and refurbishments, without redesigning the building services.