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Calculate how energy-efficient your windows are and see potential savings based on key parameters.
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Companies by city
- Miami, FL 48
- Fort Lauderdale, FL 34
- Los Angeles, CA 32
- Houston, TX 31
- Portland, OR 29
- Las Vegas, NV 26
- Omaha, NE 25
- Seattle, WA 25
- San Diego, CA 23
- Tucson, AZ 23
- San Jose, CA 22
- Dallas, TX 21
Top-performing window configurations for your climate
Based on Energy Star requirements and near Passive House–level performance
Climate-Optimized Window Performance
U-factor: Based on your selected climate zone
SHGC: Based on your selected climate zone
Cold Climate Windows (Phius)
U-factor: ≤ 0.11–0.16
High-Performance Windows (Near Passive Level)
U-factor: 0.14–0.18
SHGC: 0.30–0.40
Cold Climate: Phius Window Certification Program criteria (2023), IECC climate zones 5–8 — maximum whole-window U-factor; no SHGC limit. Not ENERGY STAR criteria.
Climate-zone card: ENERGY STAR Residential Windows, Doors, and Skylights criteria, Version 7.0 (US EPA).
High-Performance Windows (Near Passive Level): the U-factor range matches the Passive House Institute window criteria for cool-temperate to warm-temperate climates, Uw ≤ 0.80 to ≤ 1.00 W/(m²·K) (PHI criteria for transparent components, version 5.6). These criteria set no SHGC limit. Not ENERGY STAR criteria.
Grow your business with
performance-focused solutions
Energy efficiency
Windows that enhance energy efficiency reduce heating and cooling costs while maintaining comfort.
Innovation
Innovative windows with energy-saving technologies not only lower utility expenses but also support eco-friendly living.
Thermal Insulation
Windows with high thermal insulation ratings reduce outside noise and improve indoor air quality.
Guides & industry updates
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Is There a Tax Credit for Energy-Efficient Windows in 2026?
How to Find a Window Manufacturer in the US
Glossary of Window and Glazing Terms
Window Energy Ratings in the US: NFRC Label and ENERGY STAR
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Window Condensation Inside: Causes and What the CR Rating Means
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