The energy efficiency of a window is a complex equation that involves various factors such as the glass, the frame, and the window itself. Having the right window can help improve the performance of your home. Although window labels and ratings provide helpful information about a product, they don't always explain the various features that help improve a window's energy efficiency. There are six window types that each have unique characteristics that help increase a window's efficiency. 1. Fixed Windows A fixed window is an excellent choice for areas of your home that don't require ventilation. It can also be used in combination with other windows to create an airtight design that can keep large areas of glass from feeling drafty. Although fixed picture windows aren't designed to provide any functionality, they can still help improve a window's energy efficiency. Since they can't be opened, a window's airtight seal can be maintained. 2. Hinged Windows Many types of windows are available, including hopper, umbrella, and casement windows. These can be used together with picture windows to create a more functional and strategic window arrangement. A type of window designed to provide ventilation is called a hinge. It's made with a twist of a crank or a push of your hand, and it pivots outward. This design helps improve a window's air leakage rate compared to those that slide open and closed. The single-swath window has a slight overlap compared to sliding, double-hung, and single-hung windows. 3. ENERGY STAR® Windows The government has recognized the energy efficiency of windows by issuing the Energy Star label, which is based on a rating system similar to the NFRC. Although the star indicates that a window is more energy efficient than one without the label, it's important to note that the certification is based on geographical and climate conditions. For instance, if a window is highly rated in the Southwest, it may not perform well in the cold of the Northeast. Only those windows that meet the highest energy performance standards can be labeled with the prestigious blue sticker from the NFRC. 4. Insulated Windows
Today, insulated windows feature several insulation layers separated by insulating gas. These types of windows can help improve a window's energy efficiency by up to four times. Compared to single-pane and dual-pane windows, triple-pane windows have five layers of insulation. For centuries, the standard in windows was a single pane of glass. However, during the 20th century, manufacturers started adding a second pane of glass to help improve a window's energy efficiency. This new technology lowers both the U-Factor and the solar heat gain coefficient. 5. Low-E Windows In addition to being able to improve a window's energy efficiency, Low-E glass can also help protect against harmful ultraviolet radiation. For instance, Advanced Low-E Insulating Glass from Pella can block almost all of the UV rays from the Sun. This product is an all-around performer that can be used on dual- and triple-pane windows. For northern climates, Advanced Comfort Low-E Insulating Glass can help boost a window's energy efficiency by up to one percent. One of the most common reasons people choose Low-E windows is that they block infrared light, which contributes to heat energy. This type of window can also help keep the heat from coming into your home during the summer. However, Low-E glass can help maintain a window's efficiency and reduce heat loss in cold weather. Besides the glass itself, the outer surface of a window also affects its thermal performance. A low emissivity coating on the outer surface of a window can help improve its thermal performance. This type of glass can block both infrared and ultraviolet light but allow visible light to pass through. SunDefenseTM Low-E Insulating Glass can block 94% of ultraviolet light for hot and sunny climates while providing optimal light efficiency with dual and three-pane windows. Naturalsun Low-E Insulating Glass, on the other hand, can block 69% of UV rays while providing the most light. This type of product is ideal for the cold climates of northern regions. 6. Lifestyle Series Windows It's no coincidence that the Lifestyle Series of windows from Pella was able to receive the Most Efficient Product of 2020 award due to the various features that it has to offer. These products were designed to deliver the best possible energy efficiency. The wood frames of the Lifestyle Series windows are made from sustainable materials, which provide natural insulation. These products are also equipped with various energy-saving features, making them up to 83% more energy efficient. These features help these windows meet the energy efficiency standards of the 50 states.
Whether you live in a warm climate or a cold region, there are various ways to improve the efficiency of your windows. With the help of energy-efficient labels and your local representative, you can easily customize your windows to meet your specific needs.