Everyone assumes industrial drying is too hot and too dirty for heat pumps. The evidence says the sector agrees: IEA HPT Annex 59, led by RISE, surveyed 230 Swedish industries and found exactly one respondent in 71 using a heat pump for anything beyond heating sanitary water. An entire process class, consuming 13 to 35 TWh a year in Sweden alone, has been written off. MVR4G-DRY proves the assumption wrong, and it does so using the fuel that was there all along. Every gypsum board dryer already generates the working fluid its own heat pump needs, as vapour evaporated from the boards and vented up the stack. Seven steam compressors in series refuse to let it leave, recompressing it to 210°C at a lift of 160°C. Industrial MVR systems typically reach 140 to 180°C with lifts of 40 to 100°C, so this sits well outside what the technology is currently assumed capable of, with water and n-pentane as the only working fluids and no PFAS anywhere in the system. The surprising part is the scale of what one machine does. Replacing a single gas burner on a single production line removes 16,000 tonnes of CO2 per year and delivers 0.45% of Sweden's entire 2030 emission reduction target. Specific energy consumption halves, from 0.778 to below 0.389 kWh per kg of water evaporated. At the 2024 carbon tax rate, that one line is worth MSEK 23 a year in avoided tax alone. It is also a genuine commitment rather than a subsidised experiment. Of the MSEK 204 total, industry is funding MSEK 145. Knauf is putting a 10.5 MWth prototype into a working plant where board quality depends on the drying curve holding steady and where the line cannot simply be stopped. That is what makes the result credible to the next plant owner, in gypsum, dairy, wastewater or timber.