So, we learned about the “heat mirror”, turning the windows almost into a semblance of air conditioning; about the “microvntilation”, which allows, without opening the windows (and therefore, without losing heat), to make the flow of fresh air into the room available; About the design of Eleganes, making the form of window frames graceful. And all this, in turn, accustoms manufacturers and ordinary consumers to the new quality of life, when the house is not just warm, but each individual window becomes an element of the energy -saving system of the whole house.