Windows with low E glass are windows built with glass that has been treated to allow low emissivity levels – or those that emit little coldness or heat. These type of windows include those with soft and hard coats, as well as low E film.
Installing energy saving windows with E glass can save you big bucks as far as preventing heat and cold loss from your home, and these savings will far outweigh the initial installation expense in the long run.
A very thin metallic coating in or on the window glass reflects heat and coolness back to its source while blocking some amounts of ultraviolet and infrared light from coming into your house. Energy saving windows that have hard coat E glass are those with an extremely thin layer of tin applied permanently to the glass while it is in its molten state.
For soft coat E glass, thin layers of silver are applied during the process while the glass is held in a vacuum. Because the silver is very soft and can oxidize, it is placed between two layers of glass with argon gas injected to help resist oxidation of the silver.
Windows with low E film are those in which a thin, transparent low E film has been suspended between two panes of glass. Boasting ultraviolet light blockage of up 99.5 percent, these types of energy saving windows using E glass technology also provide twice the insulation characteristics as that of soft coat E glass.
Energy saving windows that feature low E glass are not cheap. Prices can vary from one retailer to another. There are a number of manufacturers, however, and so it does pay to shop around. But always keep in mind that the highest quality E glass you can possibly afford will give you the greatest energy saving benefits. And when you consider that one fourth of all the expensive heat (and the air conditioning, too!) you pay for every month through utility bills with hard-earned money is lost through windows, it’s easy to see how savings can quickly add up.