随著全球气候变暖，欧洲正面临日益频繁且剧烈的热浪袭击，使得传统上空调普及率较低的欧洲家庭与公共场所对避暑降温的需求急剧上升。然而，传统空调的普及带来了严重的气候悖论：用以维持室内凉爽的机器在运行中消耗大量电力并可能泄漏高温室效应的制冷剂，反而进一步加剧了全球气候暖化。

为了解决制冷剂带来的环境危害，欧洲的科研团队与新创公司正致力于研发无需传统制冷剂的「固态冷却」技术，例如利用镍钛合金变形时吸热放热的弹性热效应，或是利用半导体材料与磁性材料进行热量转移。这些前沿技术虽然仍处于早期研发或初步测试阶段，但有望在未来几年内引领冷却技术的典范转移，实现更高效且环保的降温方式。

除了技术层面的创新，专家指出单靠增设空调并不能完全解决欧洲城市面临的过热挑战，必须建立一套「被动降温优先」的系统性规划。这意味著政策制定者与建筑设计师应优先透过种植树木、加强遮阳、使用反射材料和促进自然通风等手段防止建筑物过热，随后才在学校、医院和养老院等高需求场所部署如利用河水冷却的高效主动降温系统。

As global temperatures rise, Europe is experiencing increasingly frequent and intense heatwaves, driving a sharp surge in demand for cooling in a region where residential air conditioning has historically been rare. However, the widespread adoption of traditional AC units presents a major paradox: the very machines used to keep spaces cool consume massive amounts of electricity and rely on chemical refrigerants that, when leaked, severely accelerate global warming.

To resolve the environmental hazards of conventional refrigerants, European researchers and startups are developing refrigerant-free "solid-state cooling" technologies, such as exploiting the elastocaloric effect of nickel-titanium shape-memory alloys or using semiconductive and magnetic materials to transfer heat. Although these cutting-edge innovations are still in their early stages of development and testing, they could spark a paradigm shift toward highly efficient and eco-friendly cooling systems in the near future.

Beyond technological breakthroughs, experts emphasize that simply adding more air conditioning will not solve Europe's urban overheating challenge, advocating instead for a "cooling hierarchy" that prioritizes passive measures. Under this framework, policymakers and architects should first prevent buildings from overheating using trees, shading, reflective materials, and natural ventilation, and only then deploy efficient active cooling systems, such as district cooling via river water, in high-need locations like schools and hospitals.