How to make glass more heat saving in winter?

1, prefer a flat window 
Glass flat windows(windows that can be opened 90 degrees) will be much better than the glass sliding window. Glass flat window is generally sealed with plastic strips,glass sliding windows sealed with a top. When close the glass flat window, the isolation of dust and rain will be stronger than the glass sliding window. The glass flat window generally use two-point lock or lock to lock close while the glass sliding window is a hook lock or a lock, so the air tightness of the glass flat window is also much stronger.

2, bay window / floor windows less than 30% of the wall 

Glass bay window and glass floor to ceiling windows, because it is more and more beautiful design, the large number of residential use this kind of glass window. But these two glass windows are often not conducive to indoor insulation, especially in the northwest glass window is more suitable for the use of this window. Even if used, the area should not exceed 30% of a wall.

3, residential window ratio 1 / 7-1 / 10 
In home decoration, the window area should not be opened too large, the larger the window area, resulting in the greater room heat loss, reasonable residential window ratio (window area and the room floor area ratio) should be 1: 7 to 1: 10.
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Source from www.sggglassmanufacturer.com