Understanding Window U-Factor, SHGC, and Energy Ratings
When people shop for new windows, they often focus on frame material or glass style first, then get stuck on the energy label. That label matters more than many homeowners expect, because a window that looks solid on paper can still leak heat, admit too much sun, or underperform in the climate it is installed in. For anyone planning window replacement, the most important figures are usually U-factor, SHGC, and the broader energy ratings that show how the unit performs as a