Single-hung windows are more efficient because of their fixed top sashes. Their efficiency can be further improved by selecting the right low-emissivity (Low-E) coating. Low-E coatings help keep air conditioning and heating inside your home. They can also welcome or limit solar heat gain. There are a variety of options suited to various climates.
If you prefer a double-hung window, certain selections can improve performance, such as the right Low-E glass option for your climate and triple-pane glass. Triple-pane glass is the most insulating option. It’s available with our A-Series and E-Series product lines. In certain geographic regions, 400 Series Double-Hung Windows can be ordered with triple-pane glass, too.
Want to learn more about how to pick out energy-efficient windows?
Are you looking for U-Factor values of our double-hung windows? Find NFRC data organized by product line in the technical documents section of our website.