Energy-Efficient Window Replacement in Denver, CO
Your complete guide to Colorado energy codes, climate zone requirements, and window installation
Quick Facts: Denver Window Replacement
Average Costs
- • Full installation: $450-1,200 per window
- • Double-pane: $400-820
- • Typical time: 1-3 weeks (6-8 weeks during hail season)
Energy Requirements
- • Climate zone: IECC Zone 5B (Cold-Dry)
- • U-factor: U-0.32 or lower for residential windows
- • 100+ NFRC-certified installers
Denver's High Desert / Cold Semi-Arid Climate & Energy Needs
Summer Average
88°F (31°C)
Winter Average
30°F (-1°C)
Heating Days
6,000
Cooling Days
700
Climate Zone: IECC IECC Zone 5B (Cold-Dry)
Climate Challenges for Windows
- ▸Extreme altitude (5,280 ft) = very high UV exposure
- ▸Rapid temperature swings (70°F swings in 24 hours)
- ▸UV degradation of seals and glass coatings
- ▸Hail damage to windows (major issue - Colorado Hail Alley)
- ▸Low humidity accelerates seal failure
- ▸High solar gain in winter, heating needs still significant
Colorado Energy Code Requirements
Energy Code
Colorado adopts IECC 2018
U-Factor Requirement
Windows must meet U-0.32 or lower for residential windows maximum. Lower is better for insulation.
Solar Heat Gain (SHGC)
No specific SHGC (cold climate) to reduce cooling costs.
Permits
Colorado requires building permits for window replacement. Installer should handle permits and inspections.
Frequently Asked Questions
How much does window replacement cost in Denver?
Full installation: $450-1,200 per window per window. Double-pane glass: $400-820. Pricing depends on size, type, and energy ratings required by IECC Zone 5B (Cold-Dry).
What are common window problems in Denver?
- Hail damage requiring window replacement
- UV degradation of Low-E coatings and seals
- Seal failure from altitude and UV exposure
- Thermal stress cracks from temperature extremes
Should I choose double-pane or triple-pane?
Triple-pane recommended for Denver's cold climate (6000 heating days). Cuts heating costs 20-30%.