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Glass Technology
Learn about Low-E coatings, insulated glass units, argon fill, and advanced glazing options for optimal performance.
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Low-E Coating Types: Low-E2 vs Low-E3 vs Low-E4
Compare Low-E coating technologies optimized for different climates and energy goals.
| Feature | Low-E2 (Passive) | Low-E3 (Solar Control) | Low-E4 (Advanced) |
|---|---|---|---|
| Primary Purpose | Keep heat IN (cold) | Keep heat OUT (hot) | Balance heating/cooling |
| SHGC (Solar Heat Gain) | 0.40 - 0.55 (higher) | 0.20 - 0.30 (lower) | 0.25 - 0.35 (moderate) |
| U-Factor (Insulation) | 0.28 - 0.32 (good) | 0.28 - 0.32 (good) | 0.22 - 0.28 (excellent) |
| Best Climate Zones | Zones 4-8 (cold) | Zones 1-3 (hot) | Zone 4 (mixed) |
| Ideal For | Heating-dominated (Boise, Denver) | Cooling-dominated (Vegas, Phoenix) | Four-season (Seattle, Portland) |
| Cost Premium | +$50-$75 per window | +$50-$75 per window | +$75-$100 per window |
| Light Transmission | 70-80% (bright) | 60-70% (slightly tinted) | 65-75% (balanced) |
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