low-e glass replacement 4

https://9927pkr16q.summitquill.com/posts/what-to-know-before-a-vinyl-window-installation

Replacing low-e glass is a bit more involved than swapping out a standard window pane because of the special coating that reflects heat. I had to call a specialist after my old seal failed and the pane fogged up between the layers. They carefully removed the old unit and installed a new one with the coating facing the right direction—apparently that's a common mistake that ruins the energy efficiency. The room stayed cooler in summer and warmer in winter right after the swap.