Best U-Factor and SHGC Ratings for Windows in Northern Virginia
Why U-Factor And SHGC Matter More Than The Sticker Price When homeowners compare replacement windows, the first mistake is often focusing on frame color or brand name before checking the energy numbers. U-factor and SHGC are the two ratings that do the heavy lifting. If you want a simple rule, look for a low U-factor first because it speaks directly to winter heat loss. SHGC, or solar heat gain coefficient, measures how much of the sun's heat gets through the glass