A Transparent Long‐Term Cooling Green Plant‐Like Window for Net‐Zero Energy Buildings

We report a bioinspired, transparent green plant‐like window that integrates passive cooling, thermal insulation, and solar‐driven waste heat recovery to reduce building energy consumption. By mimicking leaf transpiration, the system uses a carbon quantum dot‐doped CPPB hydrogel to achieve high visible transmittance (~92%) while blocking UV and NIR radiation. A self‐powered water circulation layer repurposes solar heat for domestic water heating. Outdoor field tests and 168‐h solar simulator exposure confirm long‐term thermal stability and cooling up to 21.9°C. Simulations across 30 global cities show annual cooling energy savings up to 569.1 MJ/m 2 . This scalable, multifunctional window offers a sustainable path toward net‐zero energy buildings.