U-Factor and SHGC Explained for Tennessee Homeowners
How Window Ratings Work Beyond The Sales Pitch Window shoppers often focus on style first, then try to make sense of the performance numbers later. If you want energy-efficient windows for Tennessee humidity and summer heat, these are the numbers to read first. U-Factor measures how well a window resists heat flow. It shows up in winter, when you want to keep heat inside, and it matters in summer too, when conditioned air starts bleeding out through weak units. Tha