Windows
Most Energy-Efficient Window Types for San Diego Homes (2026)
For San Diego homes in 2026, casement and fixed picture windows rank as the most energy-efficient types, followed by sliding and double-hung, because their tighter seals and compression locks meet Title 24's 0.30 U-factor and 0.23 SHGC thresholds most easily with standard Low-E dual-pane glass. No triple-pane upgrade is required for code compliance.