The Difference Between Window SHGC and U-Value

Hannah Holmes — Tue, 30 May 2023 14:00:00 +0000

Understanding the performance metrics of replacement windows helps you determine which ones will ensure your home’s energy efficiency. Two important metrics to consider are the solar heat gain coefficient (SHGC) and the U-Value. In this blog post, we’ll dive into what these terms mean, why they matter, and how they differ. Armed with this knowledge, you’ll be better equipped to choose the perfect windows for your home.

Solar Heat Gain Coefficient

The solar heat gain coefficient (SHGC) is a measurement that shows how effectively a window blocks the sun’s heat from entering your home. The SHGC is a value between zero and one, with lower numbers indicating better performance in blocking heat transmission. This metric is particularly important in warm climates or during hot summer months, as it helps reduce cooling costs and maintain a comfortable indoor temperature. A window’s SHGC depends on its glazing and frame components. Windows with low-emissivity (low-E) coatings or several layers of glazing have lower SHGC values. Certain framing materials, like wood and fiberglass, provide better insulation, which can lower SHGC.

U-Value

The U-Value measures the rate of heat transfer through a window, indicating its insulating capabilities. Lower U-Values signify better insulation, which is particularly useful in colder climates or during the winter months. Window replacement units with low U-Values help reduce heating costs and maintain a comfortable indoor environment. Similar to SHGC, the U-value of a window is influenced by the glazing and frame materials used. Windows with multiple layers of glazing or low-E coatings generally have lower U-Values. Furthermore, well-insulated frames made of materials like wood or fiberglass can help minimize heat transfer and contribute to a lower U-Value.

Comparing SHGC and U-Value

While both SHGC and U-Value are affected by the window’s glazing and frame materials, their energy efficiency goals differ. SHGC focuses on minimizing the sun’s heat entering your home, while U-Value measures the window’s overall insulating capabilities. To achieve optimal window performance, it’s essential to consider both metrics and find the right balance for your specific needs and climate.

Professional Window Installation and Replacement

Hiring professional window installers, such as Renewal by Andersen® of Alaska, ensures the optimal performance of your windows. Expertly installed windows can lead to improved energy efficiency, ultimately resulting in lower utility bills and increased home value. We offer an array of window replacement options designed to cater to your unique preferences and requirements. Give us a call or fill out our contact form to schedule a free, no obligation consultation. We’re proud to serve Anchorage, the Mat-Su Valley, Fairbanks, the Kenai Peninsula, and Juno.

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How Do New Windows Help Improve Home Energy Efficiency?

Hannah Holmes — Wed, 15 Feb 2023 18:00:00 +0000

According to the Department of Energy, space heating and cooling can account for about half of an average home’s annual utility expenses. Fortunately, you can stay comfortable while reducing energy costs by investing in energy-efficient replacement windows. In today’s blog post, Renewal by Andersen® of Alaska takes a look at how window replacement can help improve the energy efficiency of your home.

How New Windows Improve Home Energy Efficiency

Windows are part of your home’s insulated enclosure known as the energy envelope, which also includes the exterior walls and the roof. Under ideal conditions, the energy envelope should keep thermal transfer to a minimum, resulting in reduced heat loss during the heating seasons, and reduced heat gain during the cooling seasons. The lower workload that’s placed on the HVAC system, the lower the resulting energy bills will be.

Qualities of Energy-Efficient Windows

Our capable window installers and consultants can help you find the right energy-efficient windows for your home, or simply look for the ENERGY STAR® rating when buying new windows. If you are looking for specific features, here are some of the qualities that you should look for.

Insulation. Let’s start with the most important component: window glass. Insulated glass typically consists of two glass panels separated by a spacer. The gap between the interior and exterior surfaces acts as an insulating layer, and can be enhanced with an insulating gas fill. Look for the U-Factor, as indicated on its energy ratings label — the lower the U-Factor, the better the insulation.
SHGC. The solar heat gain coefficient measures how well the windows can resist heat gain from direct sunlight. The lower the SHGC value (also found on the energy ratings label), the less you’ll spend on cooling.
Installation. Poor installation can defeat even the best replacement windows on the market. This is why it’s important to choose a replacement window company that has a track record of quality installations and a limited warranty that includes installation or workmanship.

Learn more about how our replacement windows can help make your home more energy-efficient by filling out our contact form to schedule an appointment. We serve communities in Kenai Peninsula, The Valley, Fairbanks and Anchorage, AK.

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