Energy-saving Glass to have two of energy-saving characteristics: insulation and insulation.
The thermal insulation of the glass (k value) to meet the local wall to match the level. For most areas of our country, the K value of the building wall should be less than 1 according to the current regulations. Therefore, the K value of the glass window is less than 1 to "block" the building "openings" energy consumption loopholes. The k value of glass plays a major role in the energy saving of windows.
and the thermal insulation of the glass (shading coefficient) and the location of the building to adapt to the sun radiation characteristics. Different buildings have different requirements for glass insulation.