The building glass is one of the most important components when you install windows. The type of windows you choose can actually make a difference in what you wind up paying in the long run which is why good quality windows are a great investment. Glass ratings are to tell you how efficient a particular type will be in the end. Generally, the lower the number, the better the glass. Low-E Glass is a first generation glass technology that uses metal adhered to glass. This is not as efficient as other Low E coatings, but is still able to withstand a cleaning if it is not done too abrasively. This modern type of glass uses this technology in a very thin layer that reflects heat back into the home. Originally, Low E glass was applied to single pane windows. Here, it has to be hard coated which involved attaching a thin layer of tin to molten glass. If you are unable to do so, ask the companies you are considering for references. You can then contact those references to ask the questions you have before making a decision on who installs your new Low-Emissivity Glass windows. If you are interested in using Low E glass in your new replacement windows, talk to your local installers to find one who is reputable and able to do the job to your satisfaction. Remember, you are paying for the new windows which will be an important investment in your home. You want them to last a long time, so quality is of the ut most importance. Find out what others think of their Low E glass and who they would recommend. Because it is becoming so popular, you should have no problem finding window glass suppliers who have it. Silver was eventually used to develop micro fine reflective surfaces that served to greatly increase the energy performance of glass units. These layers are more softly coated and are sandwiched between two panes of glass. This makes them easier to clean as the use of abrasive cleaners is no longer an issue. As time went on, the coated glass became more effective. The double panes plus the added coating serve to keep heat in when winter descends and the cool air in during the summer. Source: glasszng.com/blog
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http://www.glasszng.com/blog/choose-the-right-low-e-glass-for-your-window-installation/