Chris and Phil cut through window jargon and focus on the numbers that actually move comfort, performance, and cost. They break down U-factor, SHGC, and visible transmittance, plus why “more glass” is both irresistible and a building science headache. You’ll leave with practical rules of thumb for spec’ing windows without getting played by marketing or your own energy model. Subscribe for more architects-at-a-bar building science, and share this one with the person who keeps saying “just do low-E.”