CertainTeed Solstice Solar Shingle vs GAF Energy Timberline Solar ES
The GAF Energy Timberline Solar ES wins this comparison by a clear margin. It offers better long-term durability with 25-year warranty. For most residential installations, the GAF Energy Timberline Solar ES is the stronger choice.
Key Differences
- • CertainTeed Solstice Solar Shingle is rated at 70W while GAF Energy Timberline Solar ES is rated at 67W, a 3W difference.
- • CertainTeed Solstice Solar Shingle achieves 15.4% efficiency vs 15% for the other, a 0.4 percentage point gap.
- • GAF Energy Timberline Solar ES comes with a 25-year product warranty vs 15 years for the other.
- • CertainTeed Solstice Solar Shingle has a superior temperature coefficient of -0.4%/°C vs -0.41%/°C, retaining more power in hot climates.
Specifications Breakdown
Module Efficiency
The CertainTeed Solstice Solar Shingle achieves 15.4% module efficiency compared to GAF Energy Timberline Solar ES's 15%, meaning CertainTeed Solstice Solar Shingle converts 0.4 percentage points more sunlight into electricity per square meter. In practical terms, the CertainTeed Solstice Solar Shingle produces 101.8 watts per square meter of panel area while the GAF Energy Timberline Solar ES produces 148.2 W/m². For rooftop installations where space is limited, this efficiency gap determines how many kilowatts you can fit on your available roof area. Over a 25-year system life, even a small efficiency advantage compounds into meaningful additional energy production.
Power Output
The CertainTeed Solstice Solar Shingle delivers 70W per panel versus 67W for the GAF Energy Timberline Solar ES, a 3W difference per module. To build an 8 kW residential system, you would need 115 CertainTeed Solstice Solar Shingle panels or 120 GAF Energy Timberline Solar ES panels. Choosing the higher-wattage option saves 5 panels, reducing total racking hardware, wiring, and installation labor costs. Higher wattage per panel is particularly valuable for commercial-scale installations where panel count directly impacts balance-of-system costs.
Temperature Coefficient
The CertainTeed Solstice Solar Shingle has a temperature coefficient of -0.4%/°C versus -0.41%/°C for the GAF Energy Timberline Solar ES. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the CertainTeed Solstice Solar Shingle retains 92.0% of its rated power while the other retains 91.8%. While the numerical gap is modest, it still accumulates over decades of summer production, especially in southern latitudes with prolonged peak heat hours.
Warranty Coverage
The CertainTeed Solstice Solar Shingle is backed by a 15-year product warranty and 25-year performance guarantee, while the GAF Energy Timberline Solar ES offers 25-year product and 25-year performance coverage. The GAF Energy Timberline Solar ES provides 10 additional years of defect protection, covering manufacturing issues, material failures, and premature performance loss. Based on their published degradation rates (2.5% first year then 0.6%/year for CertainTeed Solstice Solar Shingle; 2.5% first year then 0.6%/year for GAF Energy Timberline Solar ES), after 25 years the CertainTeed Solstice Solar Shingle should retain approximately 83.1% of original output versus 83.1% for the GAF Energy Timberline Solar ES. The end-of-life output levels are closely matched.
Physical Dimensions & Weight
The CertainTeed Solstice Solar Shingle measures 2184×315×13mm and weighs 5.9 kg, while the GAF Energy Timberline Solar ES measures 1270×356×10mm at 5.2 kg. 0.69 m² of panel area for the CertainTeed Solstice Solar Shingle versus 0.45 m² for the GAF Energy Timberline Solar ES. Their weights are closely matched, so neither panel imposes a significantly different structural load on the mounting system. The more compact GAF Energy Timberline Solar ES may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | CertainTeed Solstice Solar Shingle | GAF Energy Timberline Solar ES |
|---|---|---|
| Power | 70W | 67W |
| Efficiency | 15.4% | 15% |
| Power Density | 9.5 W/sq ft | 13.8 W/sq ft |
| Cell Type | Monocrystalline | Monocrystalline |
| Bifacial | No | No |
| Weight | 5.9 kg | 5.2 kg |
| Temp Coefficient | -0.4%/°C | -0.41%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 15 years | 25 years |
| Performance Warranty | 25 years | 25 years |
| Degradation (Year 1) | 2.5% | 2.5% |
| Annual Degradation | 0.6% | 0.6% |
| Country | United States | United States |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: CertainTeed Solstice Solar ShingleThe CertainTeed Solstice Solar Shingle achieves 15.4% efficiency versus 15% — a 0.4 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 0.1 kW more total system capacity, or 1 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: CertainTeed Solstice Solar ShingleThe CertainTeed Solstice Solar Shingle has a better temperature coefficient of -0.4%/°C versus -0.41%/°C. On a 45°C summer day (20°C above STC), the winner retains 92.0% of rated power versus 91.8%. The difference is modest but accumulates over 25 years of summer production.
3. Durability & Warranty
Winner: GAF Energy Timberline Solar ESGAF Energy Timberline Solar ES leads with a 25-year product warranty versus 15 years. After 25 years, expect 83.1% vs 83.1% of original output for CertainTeed Solstice Solar Shingle and GAF Energy Timberline Solar ES respectively.
4. Power Output
Winner: CertainTeed Solstice Solar ShingleThe CertainTeed Solstice Solar Shingle delivers 70W versus 67W per panel — 3W more. For an 8 kW system, you need 115 panels with the higher-wattage option versus 120 panels, saving 5 panels and the associated racking and labor costs.
5. Cell Technology
Winner: TieBoth panels use Monocrystalline cell technology. No technology advantage for either product.
CertainTeed Solstice Solar Shingle
The CertainTeed Solstice Solar Shingle is a building-integrated photovoltaic (BIPV) product that replaces standard asphalt roofing shingles while generating electricity. Made by CertainTeed (a Saint-Gobain subsidiary), each 70W shingle integrates seamlessly with conventional asphalt roofing for a low-profile, aesthetically clean solar installation. Installed cost is $4.50-$6.00/W.
Pros
- + Seamless integration with asphalt roofing
- + Low-profile aesthetics — nearly invisible as solar
- + Class A fire rating
- + Made in the USA
- + 15-year product warranty backed by Saint-Gobain
- + Dual function as roof covering and power generation
Cons
- - 15.4% efficiency significantly lower than conventional panels
- - 70W per shingle requires many units for meaningful output
- - $4.50-$6.00/W installed — 2-3x the cost of standard panels
- - Higher temperature coefficient due to flush roof mounting
- - Limited installer availability — requires certified roofers
GAF Energy Timberline Solar ES
The GAF Energy Timberline Solar ES is the world's first nailable solar shingle — installed with a standard nail gun just like conventional roofing shingles. Each 67W unit integrates with GAF Timberline architectural shingles for a low-profile solar roof that any trained roofer can install. Wind rated to 130 mph. Efficiency not publicly disclosed — estimated at ~15%. Installed cost is $4.00-$5.50/W.
Pros
- + World's first nailable solar shingle
- + Installable by standard roofing crews — no solar specialists needed
- + 25-year dual warranty covering power and weatherization
- + 130 mph wind rating — suitable for hurricane zones
- + Class A fire rating
- + Low profile integrates seamlessly with GAF Timberline roofing
Cons
- - $4.00-$5.50/W installed — 2-3x cost of conventional panels
- - ~15% efficiency lower than rack-mounted panels
- - 67W per shingle requires many units for adequate system size
- - Higher operating temperature from flush roof mounting
- - Only available through GAF-certified installers
Choose CertainTeed Solstice Solar Shingle If...
- ✓ Your roof space is limited and you need maximum power per panel
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ You live in a hot climate (Arizona, Texas, Florida) where heat performance matters
- ✓ Homeowners who prioritize roof aesthetics and want solar that blends invisibly with traditional roofing, especially in HOA-restricted neighborhoods.
Choose GAF Energy Timberline Solar ES If...
- ✓ Long-term warranty protection is a top priority and you plan to stay in your home for 25+ years
- ✓ Homeowners wanting solar that installs like regular roofing, especially during a new roof or re-roof project, with broad installer availability.
Our Recommendation
We recommend the GAF Energy Timberline Solar ES for most buyers in this comparison. It wins 1 of 5 key dimensions and offers a clear advantage in the metrics that matter most for a solar panel purchase. The CertainTeed Solstice Solar Shingle remains a good product, but the GAF Energy Timberline Solar ES delivers better overall value for the majority of installations.
Frequently Asked Questions
Which is better, CertainTeed Solstice Solar Shingle or GAF Energy Timberline Solar ES?
The GAF Energy Timberline Solar ES wins this comparison by a clear margin. It offers better long-term durability with 25-year warranty. For most residential installations, the GAF Energy Timberline Solar ES is the stronger choice.
Which panel is more efficient, CertainTeed Solstice Solar Shingle or GAF Energy Timberline Solar ES?
The CertainTeed Solstice Solar Shingle at 15.4% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 0.4 percentage points translates to approximately 3W per panel under standard test conditions.
Which has a better warranty, CertainTeed Solstice Solar Shingle or GAF Energy Timberline Solar ES?
The CertainTeed Solstice Solar Shingle comes with a 15-year product warranty and 25-year performance guarantee. The GAF Energy Timberline Solar ES offers 25-year product and 25-year performance warranties. GAF Energy Timberline Solar ES provides 10 additional years of product coverage.
Which panel performs better in hot weather?
The CertainTeed Solstice Solar Shingle has a temperature coefficient of -0.4%/°C and the GAF Energy Timberline Solar ES is -0.41%/°C. CertainTeed Solstice Solar Shingle retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many CertainTeed Solstice Solar Shingle vs GAF Energy Timberline Solar ES panels do I need for an 8 kW system?
For an 8 kW system: you need 115 CertainTeed Solstice Solar Shingle panels (70W each) or 120 GAF Energy Timberline Solar ES panels (67W each). The CertainTeed Solstice Solar Shingle requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026