Join Date: Jan 2016
Thanked 8 Times in 6 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
No, low-E is not about UV - quite the opposite, it is about IR, specifically it is about the window having a low emissivity in the infrared spectrum.
A principle of physics is that an object's ability to absorb radiation is identical to the ability to radiate radiation - this is called the blackbody principle. A window with high emissivity will absorb more radiation if the environment is hotter than the window, and will radiate more if the environment is cold, as compared to a low emissivity window.
Then you add having a dry inert gas between panes to cut convection and conduction between the panes, and you have a modern high R value window.