Choosing the Best U-Factor and SHGC Ratings for Windows in Northern Virginia
What U-Factor And SHGC Really Measure When people compare windows, they often get pulled into frame material, grille patterns, and whether a sash looks traditional enough for the house. A lower U-factor means better insulation, which is usually what you want for winters, drafts, and rooms that feel hard to keep warm. That distinction matters in Northern Virginia, where a house can face muggy, hot afternoons in July and then cold, windy stretches in January. The