Warm in the winter, cool in the summer – that is what intelligent windowpanes will be used for in the future. How does it work? The secret is an energy-efficient coating, which is transparent and reacts to solar heat. At low temperatures it lets heat through, and at high temperatures it reflects the rays like a mirror, ensuring that the heat doesn’t enter the room. This saves lots of energy that otherwise would be used for heating and cooling. In the face of dwindling resources and rising heating costs, the use of intelligent windowpanes has great potential for regulating energy.