: Lower is better. A lower number means the window is a better insulator and keeps more heat inside during winter and outside during summer. Eurocraft Energy Efficiency Features
: Frames and sashes are fusion-welded to prevent gaps or splits that could lead to air leakage. Choosing the Right Rating for Your Climate Eurocraft Windows U Rating
A U-rating measures the rate of non-solar heat transfer through a window assembly, including the glass, frame, and spacers. : Ratings typically range from 0.20 to 1.20 . : Lower is better
The (or U-rating) for Eurocraft windows typically indicates high energy efficiency due to their multi-chambered uPVC construction and insulated glass. While specific U-ratings vary by model and glass configuration, high-performance windows generally aim for a U-factor of 0.30 or lower . Quick Guide to Window U-Ratings Choosing the Right Rating for Your Climate A
: Use of Kommerling uPVC extruded profiles, which are designed for high insulation and durability against streaking or chalking.