As a local Indianapolis window company, we’re often asked this question. The best energy efficient windows aren’t from one manufacturer or made from one material. As a homeowner, you need to understand the terminology used by the National Fenestration Ratings Council (NFRC) when they independently rate windows. You should also understand how different materials and manufacturing processes may impact a window’s energy efficiency.
What One Common Feature Do all the Best Energy Efficient Windows Have?
The answer to this question is Low-E glass, even if the term glass is a misnomer. It’s actually a coating on the glass, however, we do call it Low-E glass in the industry. This glass added to any window frame material and any number of panes is more energy efficient than plain uncoated glass. The coating acts as a thermal barrier reducing energy loss by up to 50%. It does this by reflecting heat in your home back in during winter and out during summer. An added benefit is that Low-E glass provides some thermal protection.
Can Frame Materials Impact Energy Efficiency?
If you search what material the best energy efficient windows are made from you’ll find that the general consensus is fiberglass. However, fiberglass windows are also among the most expensive. For most people buying new windows, vinyl provides the energy efficiency they want for their home. Vinyl windows have excellent levels of insulation and therefor are energy efficient. For historic homes, consider clad windows, many of which are as energy efficient as vinyl. In addition to material, the construction method can also impact energy efficiency.
Do Window Styles Impact Energy Efficiency?
Yes, and it should be no surprise that the most energy efficient window style is a picture window. A picture window doesn’t open so there are fewer places for air to leak out or in. However, it’s unrealistic for a home to have all picture windows. The best energy efficient windows that open are casement windows. As a solid window that opens and closes into the window’s frame, they have few leak points as well.
Can I Trust the NFRC Ratings?
Definitely. They are an independent organization that buys the windows they rate from the manufacturer. However, you need to understand their ratings and how they relate to your energy efficiency goals. The first thing you should know at is your ENERGY STAR® zone. Indianapolis is in the North-Central climate zone. This map and chart shares not only the zones in the U.S., but also the certification criteria for both the U-Factor and the Solar Heat Gain Coefficient. They are the two most important factors to compare in NFRC ratings. For more information about the ratings and how to look at a NFRC sticker, click here.
Does the NFRC Rating Tell Me Everything About Energy Efficiency?
No. The NFRC ratings tell you a lot about the window’s energy efficiency, however, that not the only thing you should look at when choosing your new windows in Indianapolis. You should look to see if the manufacturer discloses the R-value of their windows. It’s not required, but if you can compare R-values of different windows, you can have another clue as to whether the windows you’re consider are the best energy efficient windows for you.
Still Have Questions About the Best Energy Efficient Windows for Your Home?
Call Blair Windows and Doors. We’re an independent window company in Indianapolis with over 70 years of experience providing quality windows for new construction homes and replacement windows for existing homes. Let us help you choose the best energy efficient windows for your goals, budget, and preferences. Call us today at (317) 356-4666 or fill out our contact form to schedule your free in-home consultation and quote.
