MAXIMUM ENERGY EFFICIENCY

GASES

Argon/Krypton Gas:  Gases that are filled between the two panes of glass providing maximum energy efficiency.

LOW E

A coating applied to the window to providing a U-factor.  The lower the U-factor the better insulation protection you receive resulting in lower energy bills.  Also the low E coating reflects the UV rays protecting your floors and furniture from fading.

AIR INFILTRATION

Air Infiltration:  How much air can pass through a closed window.  The lower the number the better because the rate of air exchange in a room has a big impact on energy use and comfort. (draftiness)