What are the benefits of low E glass?

When the temperature soars, ordinary window glass just can’t handle the heat. During cold weather, the insulating effect of your windows has a direct impact on how your rooms feel.   Typically, 75% of the exposed surface of a window is glass, and the temperature of the room-side of the glass directly affects the air temperature in the room. The better insulated the window glass, the warmer your room will be.