How does Low-E glass work?
Low-E glass coatings work by reflecting or absorbing IR light (heat energy). The thickness of the Low-E coating and the position in the window (#2 or #3 surface) dictate how the window will perform.
*When installed on the number #3 surface of an insulated glass unit (IG), the Low-E coating will reflect IR heat from inside the room to help reduce the energy loss during cold months, thereby reducing heating loss.
* When installed on the #2 surface of an IG unit, the Low-E coating will reflect or absorb IR heat from the outside, thereby reducing solar gain and cooling cost during warm months.