In every type of window, glass makes up the largest portion, which is why it can significantly impact energy loss. Windows made of ordinary glass do poorly in terms of energy efficiency. Try feeling the inner portion of the glass on a hot summer’s day, and you’ll notice how hot it can get.
Fortunately, modern window glass can prevent heat from passing through. This means you can improve your windows’ efficiency by:
- Adding more glass panels
- Adding low-emissivity (low-e) coating
- Adding gas between the glass panels
Today’s energy efficient windows have at least two glass panels with a small space between them. The additional glass panel provides some space in between that can be filled with inert gas, such as argon, which is capable of blocking more heat and thereby making the window more energy-efficient.
Aside from adding more glass panels and filling the gap between them with gas, manufacturers also coat the inner and outer portions of the window glass with a low-e coating, which is a virtually invisible layer of metallic oxide. This coating prevents heat from passing through the glass, allowing only visible light through and thus increasing the window’s overall energy-efficiency rating.
So, how do you choose the best energy-efficient glass for your window? The best way is to check the NFRC rating of the window. This rating will show precisely how good the window is at conserving energy.
Another way is to check the manufacturer’s specifications of the window. You’ll need to look for window glass that not only has a low-e coating, but is also gas filled and has at least two glass panels.
Now that you know what to look for in windows, you are better equipped to pick out the most energy-efficient replacement windows out there. For best results, consult a trusted window company in your area that can provide you with professional recommendations and services.