low-e glass replacement 2

https://charlie-wiki.win/index.php/Storefront_Glass_Replacement:_What_Business_Owners_Need_to_Know

Replacing low-e glass isn't as straightforward as swapping out a regular pane. The special metallic coating that reflects heat has to face the right direction—usually inside the insulated unit—or you'll lose the energy efficiency you're paying for. A neighbor had hers installed backwards and the summer sun turned her living room into a greenhouse. Measure twice, seal carefully, and always confirm which side is coated before setting the new glass into the frame.