CNET logo Why You Can Trust CNET

Our expert, award-winning staff selects the products we cover and rigorously researches and tests our top picks. If you buy through our links, we may get a commission. Reviews ethics statement

Timberline Solar by GAF Energy Review: A Solid Solar Roof Option

The largest roofing manufacturer in the US offers one of the best solar roof options. Here's what you get from GAF Energy.

Andrew Blok Editor I
Andrew Blok has been an editor at CNET covering HVAC and home energy, with a focus on solar, since October 2021. As an environmental journalist, he navigates the changing energy landscape to help people make smart energy decisions. He's a graduate of the Knight Center for Environmental Journalism at Michigan State and has written for several publications in the Great Lakes region, including Great Lakes Now and Environmental Health News, since 2019. You can find him in western Michigan watching birds.
Expertise Solar providers and portable solar power; coffee makers, grinders and products Credentials
  • Master's degree in environmental journalism
Sarah Drolet Associate Writer
Sarah Drolet is an associate writer at CNET covering home energy, residential solar power and emerging energy technology. She previously wrote about home and moving-related topics for MYMOVE. Sarah graduated from Coastal Carolina University with a bachelor's degree in communications.
Andrew Blok
Sarah Drolet
9 min read

GAF Energy


  • Installs just like a roof
  • Promises fewer leaks
  • High efficiency
  • Sleeker looks

Don't like

  • No high-end option with smaller production declines
  • Lower wattage per shingle than other solar roof options
  • Can't be angled

Since GAF Energy debuted its Timberline solar shingles in 2021, roofers have installed them in 16 states. Although it's still a relatively new solar technology, this could mark a major change in how homeowners access solar energy on their roofs. 

There are 5 million new roofs put on homes each year, and 1.5 million of them use GAF shingles, said Rey Holmes, GAF Energy's vice president of services and product. Converting even some of those roofs to GAF Energy's solar shingles would mark a significant increase in residential rooftop solar in the US. 

Though CNET wasn't able to go through the purchasing process and engage in hands-on testing in our review process, carrying out a review of GAF Energy -- which is based on data from the internet and an interview with a GAF Energy representative -- is less straightforward than it is with other solar companies. GAF Energy's product and business model are unique among the companies we've reviewed so far on the site, making head-to-head comparisons trickier. When comparisons fall short, or something can't be said for sure, it will be noted in the review.

Can solar panels save you money?

Interested in understanding the impact solar can have on your home? Enter some basic information below, and we’ll instantly provide a free estimate of your energy savings.

What do I get from GAF Energy?

Instead of dealing in solar panels, which get mounted to roofs on metal racks, GAF Energy sells solar shingles, called Timberline Solar, that nail into roofs like any old asphalt shingle. The shingles sit flat against the roof, with electrical components housed in conduit on the front of each one. It makes for a less obtrusive look than solar panels, but not as seamless as the sleek-but-pricey Tesla Solar Roof.

Because solar shingles and solar panels are different technologies, it's not as useful to compare the energy-generating specs of Timberline Solar and the offerings from other solar companies that offer solar panels. 

Can solar panels save you money?

Interested in understanding the impact solar can have on your home? Enter some basic information below, and we’ll instantly provide a free estimate of your energy savings.

But we can compare Timberline Solar to other solar shingle products. GAF Energy's Timberline Solar warranties are on par with those for the Tesla Solar Roof, and are longer than other solar shingle brands we've seen. You get additional coverage options with GAF Energy, offering two different addendums to choose from. Timberline Solar shingles also have the highest efficiency rating of any solar shingle product we've seen (about 23%), according to GAF Energy.

Watch this: New Solar Shingles You May Not Even Notice

Timberline Solar has the lowest wattage per shingle that we've seen (45 watts). The typical wattage of a solar shingle is around 70 watts and the average wattage of a solar panel is between 250 and 400 watts. You'll likely need to install more Timberline Solar shingles than you would with other brands to meet your home's energy needs and match the wattage of a singular solar panel. 

Timberline Solar shingles are also a bit larger than similar solar shingle products, such as those from Tesla. Why does this matter? Solar shingles are typically priced per square foot. So you might need more shingles to meet your home's energy needs with Timberline Solar.

In late July, GAF Energy issued a recall for some solar shingles and related equipment it had installed from November 2021 to April 2023, due to a fire risk. By early August, GAF Energy told CNET, 80% of the affected installations had already been repaired. The US Consumer Product Safety Commission noted reports of one fire and five "thermal incidents."

What solar equipment does GAF Energy install?

GAF Energy only offers Timberline Solar shingles, and does not offer solar panels. And the company technically doesn't install them. A GAF-certified contractor will be the one putting solar on your roof. You'll be able to monitor your solar roof's electricity production through the GAF Energy homeowner portal. This is web-based, meaning there's no app. 

Timberline Solar shingles on a roof.

Timberline Solar shingles sit flat on the roof because they're part of the roof.

GAF Energy

Solar inverters play an important role in turning solar energy into usable energy for your home. GAF Energy uses Delta and SolarEdge string inverters. SolarEdge inverters are widely distributed, highly efficient and offer a solid warranty. They also won the top spot on CNET's best solar inverters list. Delta inverters are a solid option as well, but we found SolarEdge to be the better choice of the two.

What about solar batteries? You'll be able to get one, just not through GAF Energy. Timberline Solar roof is compatible with many battery options on the market, according to the company. You'll need to speak with a licensed energy storage contractor to get a battery installed.

What warranties does GAF Energy offer?

Compared to similar solar shingle products on the market, GAF Energy offers a strong limited warranty for Timberline Solar. Here's what you'll get:

Product warranty: One of GAF Energy's biggest promises with Timberline Solar is protection from leaks. So the company guarantees no leaks from manufacturer defects for 25 years.

Wind warranty: GAF Energy offers a 15-year warranty against winds up to 130 mph.

Power production warranty: GAF Energy says your solar shingles won't decrease in production more than 2% in year one or more than 0.55% per year after that. After 25 years, Timberline Solar should still produce at 84.8% its original level. That rate of decline is in line with many solar panels in use today, but lags behind some top-of-the-line offerings.

For an additional cost, Timberline Solar comes with two enhanced solar warranties you can add on: Solar Plus and Solar Max. With a Solar Plus warranty addendum, you receive a one-year guarantee of the electrical workmanship and 10 years of coverage for third-party electronics. 

With the Solar Max warranty addendum, you receive a 10-year guarantee on the electrical workmanship and 25 years of coverage for third-party electronics. You'll also receive a 25-year solar power generation guarantee. This guarantees that your Timberline Solar system will generate a specific number of kilowatt hours by certain points throughout the 25 years. The value of this guarantee depends on how many kilowatt hours are promised. Such decisions are made from project to project.

Holmes said that while GAF isn't focusing on backup batteries just now, the systems are compatible with all major battery brands, and customers will be able to add one.

 Does GAF Energy use subcontractors?

Yes, GAF Energy uses a network of certified roofing and electrical contractors to install Timberline Solar shingles. These solar shingles are nailable, meaning that the actual "solar" shingles themselves can be installed by qualified roofers, along with the regular shingles on your roof at the same time. A local GAF-certified roofer will install the solar shingles and an electrician will handle the inverter installation, wiring and other electrical components.

How much does a Timberline Solar roof cost?

It's hard to say. Comparing prices between Timberline Solar and conventional solar panels is difficult. While conventional solar panels go on top of your roof, Timberline Solar is part of your roof. That means you buy a new roof and Timberline Solar at the same time.

Though prices vary by market and by project, getting a new roof and solar from GAF Energy costs about the same as a new roof and traditional rooftop solar panels, the company said. So getting Timberline Solar only makes financial sense if you're ready to replace your roof.

Walking on Timberline Solar

Timberline Solar shingles lay as flat as a conventional roof shingle, though they have a more horizontal look that lacks the tabbing of the shingles around them. Still, the effect is far less jarring than rack mount solar.

GAF Energy

What financing options does GAF Energy offer?

GAF Energy itself doesn't offer any financing or leasing options for Timberline Solar. But your GAF-certified contractor might. It's pretty common for solar installers and contractors to offer some type of solar loan or financing program. Although some are better than others. If there are multiple GAF-certified solar roof installers in your area, compare their finance offerings to see which is most feasible for your budget.

There are other ways to pay for your solar roof as well. Paying cash up front, a personal loan from your bank or a home equity line of credit are just a few other options.

Does GAF Energy operate in my state? How do I order?

A map of states where GAF Energy operates.
Zooey Liao / CNET

Timberline Solar is available in 16 states.

States available

GAF Energy makes Timberline Solar, but it's installed by GAF-certified Master Elite roofers. That means while some people come to GAF Energy directly through its website, most engage exclusively with their contractor.

If you're in the market for a roof and specifically looking for Timberline Solar, you can fill out an online form on GAF Energy's website, which will connect you with a local installer, or add you to a waitlist to be notified when Timberline Solar becomes available in your area. From ordering to installation, GAF-certified roofers handle the project, though they work with local electricians to handle the side of the project that involves inverter installation and necessary wiring.

Is GAF Energy my best choice?

Solar shingles on a brick house.

Timberline Solar is visible on a roof, but more subtle than solar panels.

GAF Energy

While we weren't able to buy or perform any kind of hands-on testing for this review, we can still compare the Timberline Solar roof to other solar roof products. And as far as solar roofs go, a Timberline Solar roof from GAF Energy is a solid choice. The other major solar roof player, Tesla Solar Roof, looks sleeker but comes at a fairly steep premium (though cost varies based on your roof's complexity and size) and its maximum wind withstanding speed is 20 mph less. Timberline Solar shingles also have a maximum efficiency rating of 23%, according to GAF Energy. This is the highest efficiency rating of any other solar shingle brand we've seen. Timberline Solar from GAF Energy should match up well with conventional solar on price, too.

If you're on the fence about whether you should install solar shingles or solar panels, the main factors to consider are your budget and aesthetics. Solar shingles will likely make the most sense for you if your roof needs to be replaced before installing solar panels, and if you're not a fan of the "look" of solar panels on your roof. If you don't need your roof replaced and you don't care about aesthetics, installing solar panels is probably a better option. However, it's worth pointing out that Timberline Solar's performance over time is comparable to many conventional solar panels on the market today, although higher-performance solar panels have higher guaranteed performance later in their lives.

Solar roofs are still considered somewhat of a niche product in the solar space, and are offered by very few installers. You might even only have one solar roof option in your area. But to get the best price possible, get quotes from as many solar roof installers in your area as possible, even if there are only two.

Read more: Want something smaller than a whole-home solar system? See our picks for the best portable solar panels and solar generators.

GAF Energy pros and cons


  • Installs like a normal roof
  • Promises longer protection against leaks and defects
  • High efficiency


  • Can't be angled 
  • Lower wattage per shingle than other solar roof options
  • Could cost you more than solar panels

How we evaluate solar companies 

Reviewing solar companies in a hands-on way is difficult. Accounting for all the differences project to project is impossible. To provide a helpful review, we focused on what we can measure and meaningfully compare among companies.

We focus on three buckets of criteria: equipment, warranties and service. 

Within the equipment category, companies receive scores for the panels, inverters and batteries they install. Warranties include the guarantees on the panels, workmanship and weatherization against leaks. Companies earn points for service if they offer a price match, a meaningful level of price transparency and a well-rated app for monitoring solar production. They lose points if there are major issues pertaining to customer service (lawsuits, investigations or clear reputations for shoddy service). These issues will always be detailed in the review.

You can read a detailed look at how the scoring breaks down.

We don't consider the average price of a company's installations in their score. This information is difficult to find and hard to compare across service areas (and even roof to roof). Companies are often slow to disclose it, too. We also leave out easily found but not useful information like how many states a company operates in.

Frequently asked questions

What is the difference between solar panels and solar shingles?

Both solar panels and solar shingles use sunlight to generate electricity. The biggest differences are in aesthetics, performance and cost. Solar panels are mounted on your roof (or on the ground), and are generally wide and bulky. Most monocrystalline solar panels will also have higher efficiency ratings than solar shingles.

Solar shingles are essentially small solar panels that are designed to look like traditional roof shingles, and are integrated with your roof to look like traditional roofing material. Not everyone likes the "look" of rooftop solar, making solar shingles a good alternative for those who want to go solar but don't want bulky solar panels on their roof. Installing solar shingles could also be a better option if you need to have your entire roof replaced to install solar.

What are the setbacks of solar shingles?

There are quite a few cons that come with installing solar shingles versus solar panels. The main setbacks are that they often have lower efficiency ratings, higher installation costs (depending on the company), limited availability and lower wattage, which can make it harder (and potentially more expensive) to meet your home's energy needs.

Do Timberline Solar shingles qualify for the federal solar tax credit?

Yes. Since solar shingles count as PV equipment, they are eligible for the federal solar tax credit. The federal solar tax credit allows you to claim 30% of the total cost of your solar system back in federal tax credits. But this tax credit might not cover the cost of the rest of your roof's replacement.