When sunlight hits the liquid-filled window, the water begins to absorb the heat, blocking it from entering the room. The hydrogel causes the liquid to turn opaque in sunlight, further reducing thermal transmission. The result is that less energy is required to cool the space. As the sun goes down, the window turns clear again and the heat is released. As a side bonus, the liquid between the panes also doubles as a sound insulator. Testing indicating that it “reduces noise 15% more effectively than double-glazed windows.”

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