Energy-Efficient Window Replacement in Spokane, WA
Your complete guide to Washington energy codes, climate zone requirements, and window installation
Quick Facts: Spokane Window Replacement
Average Costs
- • Full installation: $400-1,080 per window
- • Double-pane: $360-700
- • Typical time: 2-3 weeks
Energy Requirements
- • Climate zone: IECC Zone 5B (Cold-Dry)
- • U-factor: U-0.30 or lower for residential windows
- • 25+ certified installers
Spokane's Cold Semi-Arid Climate & Energy Needs
Summer Average
84°F (29°C)
Winter Average
29°F (-2°C)
Heating Days
6,800
Cooling Days
600
Climate Zone: IECC IECC Zone 5B (Cold-Dry)
Climate Challenges for Windows
- ▸Cold winters require high-insulation windows
- ▸Temperature extremes (-20°F to 100°F) stress seals
- ▸Moderate cooling needs in summer
- ▸Low humidity affects seal longevity
- ▸Occasional severe weather (ice storms, hail)
- ▸Washington strict energy codes apply
Washington Energy Code Requirements
Energy Code
Washington State Energy Code (WSEC) - among strictest in US
U-Factor Requirement
Windows must meet U-0.30 or lower for residential windows maximum. Lower is better for insulation.
Solar Heat Gain (SHGC)
No specific SHGC requirement to reduce cooling costs.
Permits
Washington requires building permits for window replacement. Installer should handle permits and inspections.
Frequently Asked Questions
How much does window replacement cost in Spokane?
Full installation: $400-1,080 per window per window. Double-pane glass: $360-700. Pricing depends on size, type, and energy ratings required by IECC Zone 5B (Cold-Dry).
What are common window problems in Spokane?
- Condensation and frost in winter
- Seal failure from temperature extremes
- Energy loss through older windows
- Ice buildup on window frames
Should I choose double-pane or triple-pane?
Triple-pane recommended for Spokane's cold climate (6800 heating days). Cuts heating costs 20-30%.