How Energy-Efficient Windows and Doors Work
U-factor describes how easily heat moves through a window or door assembly; lower means warmer in winter and cooler in summer. SHGC measures how much solar heat gets in; match higher values to cold zones and lower values to sunny, hot regions for balance.
How Energy-Efficient Windows and Doors Work
Low-emissivity coatings reflect invisible heat while letting in visible light, improving comfort without heavy tint. Inert gas fills, like argon or krypton, reduce convection between panes. Together they stabilize indoor temperatures and cut drafts you feel near glass on windy evenings.