These days, is nearly impossible to come across a homeowner who doesn’t care or, at least, know about the importance of energy efficient windows in the home.
Even so, many of us tend to forget that the term “window” does not only refer to the expansive glass area. Window frames are just as critical to the energy performance of the entire unit, and must be chosen with care if you wish to effectively curb utility costs.
Let’s take R-value, for example. R-value is the measure of thermal resistance, and it is one of the primary benchmarks upon which homeowners base their energy-conscious decisions. According to the National Renewable Energy Laboratory (NREL), window frames affect the overall R-value of a window unit. In fact, some manufacturers think the biggest source of thermal transfer in a unit is attributable to the frame. As such, we recommend choosing the right framing material to facilitate maximum energy efficiency.
Material Choices
Wood. Natural wood has a high R-value, and is not adversely affected by temperature changes. It also has low condensation formation potential. But wood has to be stained and refinished every so often, and it must be maintained to eliminate the risk of swelling – which can lead to rotting and warping.
Metal. Metal frames such as aluminum and copper are not as great at reducing unwanted energy transfer. But those designed with thermal breakers do have higher R-values.
Composites. There are plenty of composites available today as window frames, including:
· Vinyl. Vinyl is commonly made from polyvinyl chloride (PVC), and has moderate to high R-value. It can be strengthened with aluminum or steel-reinforcing bars.
· Fiberglass. Fiberglass performs better than vinyl when it comes to insulating your window unit, and is also stronger. Some models can be fitted with additional insulation to further boost performance.
· Fibrex. A patented product by Renewal by Andersen, Fibrex combines the low maintenance needs of vinyl with the energy performance of wood. The material is a great insulator – better than other materials – and is durable. It is also impervious to thermal expansion.
Choosing Window Frames
Consider these options when selecting window frames:
Your climate zone.Some materials perform better in some climates than others. Vinyl frames may have good thermal performance, but they easily crack under extreme heat.
Your goals. Just because you want a more energy efficient window does not mean you have to compromise on aesthetics. There are a lot of frame materials that can enhance your home’s curb appeal, such as wood or Fibrex.
Considerations When Installing Energy Efficient Window Frames
Other window components. While window frames are important to a window unit’s energy performance, they are not the only components. Choose glazing that works well for your weather patterns. Fibrex, for instance, performs best when paired with high-performance low-e4 glass from Renewal by Andersen.
Your contractor.Proper installation is key to harnessing any product’s functionality, and the right contractor will make sure of that. Look for extensive experience, fair pricing, and a trusted partnership with an established brand. Also, schedule an in-home consultation before signing anything to get a feel for the quality of service that you will get.
Author Bio
Simon Gale believes beautiful windows should also function beautifully. A consultant for Renewal by Andersen of Long Island, his beliefs are reflected in every window project he participates in. To receive updates, check out the Renewal by Andersen of Long Island blog.
