4 Factors To Consider When Choosing Energy-Efficient Windows

Energy-efficient windows enhance insulation, reduce heat transfer, and lead to lower energy consumption for heating and cooling. These windows also help maintain a comfortable indoor temperature, reducing reliance on HVAC systems and saving on utility bills. But you will only reap these benefits if you use energy-efficient windows. Learn about the main factors to consider when choosing energy-efficient windows. 

1. Key Terms 

Four essential terms to understand are Low-E glass, insulated glass, U-factor, and solar heat gain coefficient (SHGC).

Low-E (low-emissivity) glass refers to a window glass coated with a thin, transparent layer that reduces heat transfer and prevents radiant heat from escaping during colder months. The glass helps maintain a comfortable temperature inside the house, reducing the need for excessive heating or cooling.

Insulated glass comprises multiple glass panes separated by a gas-filled space or a warm-edge spacer. This design minimizes heat transfer through the window, improving insulation and reducing energy consumption.

The U-factor measures the window's overall heat transfer rate. The factor quantifies how well a window stops heat from getting out of or entering a building. A lower U-factor indicates better insulation and reduced heat loss, making it an important factor in energy-efficient windows.

The Solar Heat Gain Coefficient (SHGC) measures the amount of solar radiation that enters a window. A lower SHGC means reduced solar heat gain, which is beneficial in hot climates to minimize the need for air conditioning and maintain a cooler indoor environment.

2. Window Frames

Window frames play a significant role in the overall thermal performance of the windows and can greatly impact energy efficiency. Several different types of window frames are available in the market, including metal frames, wood frames, vinyl frames, and composite frames. While metal frames such as aluminum or steel are durable and low-maintenance, they are poor insulators and can conduct heat, resulting in significant energy loss. 

You can replace metal frames with more suitable alternatives to improve thermal resistance and enhance energy efficiency. Wood frames offer better insulation than metal frames and have natural insulating properties. However, wood may require regular maintenance and can be susceptible to moisture damage.

Vinyl frames, on the other hand, are popular for their excellent thermal resistance. Moreover, vinyl frames are low-maintenance, durable, and often more affordable than other alternatives. Another option is composite frames that combine materials like wood fibers and polymers. 

3. Number of Panes 

Single-pane windows are the least energy-efficient, allowing heat to escape easily. A minimum requirement for energy efficiency is double glazing, which consists of two glass panes separated by a layer of air or inert gas. This design significantly reduces heat transfer and improves insulation compared to single-pane windows. 

For even greater energy efficiency, triple-pane windows are an excellent option. Triple glazing utilizes three glass panes with two insulating layers, providing enhanced insulation and reducing heat loss even further. These windows are particularly beneficial in colder areas where maintaining a comfortable indoor temperature is essential.

4. Window Installation and Placement

Preventing air infiltration is essential for energy efficiency. Properly installed windows with a tight seal minimize drafts and air leaks, preventing warm air from escaping during winter and cool air from seeping out during summer. This reduces the strain on heating and cooling systems, leading to significant energy savings.

Window placement can also contribute to energy savings. Strategically positioning windows to maximize natural light while minimizing direct sunlight can reduce the need for artificial lighting and prevent excessive heat gain during the summer months. During winter, well-placed windows can harness the sun's warmth to heat the interior passively. 

Kelly's Construction, Inc, provides window, siding, and gutter services. We can help you identify and install energy-efficient windows. Contact us today for more information.