The market for residential solar in 2026 is crowded, fragmented, and full of bad actors mixed in with legitimate operators. Pick the wrong company (see our solar install companies comparison) and you live with a 25-year system warranty held by a contractor who is out of business 3 years after the install. The honest read on solar installation companies is that the market splits into three tiers (national, regional, local), two business models (EPC vs. dealer), and a small handful of certifications that actually mean something (NABCEP being the big one). This piece walks the landscape, names the major players in mid-2026, explains the EPC-vs-dealer split that drives most of the bad customer experiences, and gives you a vetting checklist.
The Three Tiers of the Market
National installers operate in 15+ states with their own crews and project managers. They have brand recognition, dedicated financing partnerships, and the operational scale to honor warranties for 10+ years. They are also the most expensive ($3.20-4.00 per watt installed in 2026) and the most likely to use door-to-door sales tactics that get people locked into bad contracts.
Regional installers operate in 3-10 states or a single multi-state region (Sun Belt, Mountain West, Mid-Atlantic). They have lower overhead and lower prices ($2.80-3.50 per watt) but their warranty backing is only as strong as their balance sheet, which is often thin. Some are excellent operators; some are dressed up to look national and are not.
Local installers operate in 1-3 metro areas with 5-30 employees. Lowest prices ($2.60-3.20 per watt) and best customer experience for the well-run ones. The risk is that they go out of business and the workmanship warranty disappears. For the broader vetting playbook, our how to choose solar installer piece walks the full process.
The Major National Installers in Mid-2026
Sunrun. Largest residential solar installer in the US. Public company (NASDAQ: RUN). Operates in 20+ states. Heavy emphasis on solar lease and PPA financing (you don’t own the panels). Strengths: brand, scale, warranty backing. Weaknesses: most expensive in the market, lease/PPA contracts that lock the homeowner into 20-25 year escalators, mixed customer service reviews.
Sunnova. Public company (NYSE: NOVA). Operates in 40+ states via a hybrid model: some markets they install directly, most markets they partner with dealer-installers. Stronger on financing than on install quality (because the dealer network varies). Filed for Chapter 11 reorganization in 2025 and emerged, so financial backing is now a real question for long-term warranties.
Palmetto. Operates in 25+ states. Mix of direct install and dealer model. Focus on cash sales and homeowner-owned systems (less push toward lease/PPA). Strong tech platform for energy monitoring.
Trinity Solar. Operates in the Northeast and Mid-Atlantic primarily. Family-owned, in business since 1994. Direct install model with own crews. Strong customer reviews. Smaller national footprint but better operational quality.
Momentum Solar. Operates in 10+ states. Aggressive sales model that has generated regulatory attention in multiple states. Pricing is high. Read contracts carefully.
ADT Solar. ADT acquired Sunpro Solar in 2021 and rebranded as ADT Solar. Operates in 20+ states. ADT shut down the residential solar business in early 2024, and most existing customers were transferred to other installers for ongoing service. If you have an ADT Solar (or legacy Sunpro) install, your service contact has changed; check your paperwork.
Freedom Forever. Operates in 25+ states via dealer model. One of the largest dealer networks in the industry. Pricing is mid-market but customer experience varies wildly by dealer.
Ion Solar. Operates in 15+ states. Mostly direct install. Stronger on Mountain West and Mid-Atlantic. Mid-market pricing.
GreenHome Systems. Operates in 10+ states. Mostly direct install with some dealer partnerships. Mid-market pricing and reasonable customer reviews.
EPC vs. Dealer Model: The Key Distinction
This is the single most important thing to understand before signing any solar contract.
EPC (engineering, procurement, construction) model: one company handles design, equipment sourcing, permitting, installation, interconnection, and post-install service. The company owns the entire customer relationship. If something goes wrong in year 5, you call them. The labor warranty is theirs. The workmanship matters to them because their reputation depends on it.
Dealer model: a sales company sells the system to you, then transfers the install to a sub-contracted installer. The sales company collects a sales fee (typically $0.50-1.00 per watt, sometimes more). The installer does the work for whatever margin is left after the sales company takes their cut. The customer relationship is fragmented across two parties.
The problems with the dealer model: when something goes wrong, the sales company points at the installer and the installer points at the sales company. The installer is incentivized to minimize cost (because their margin is squeezed by the sales fee), so they may use lower-cost equipment and rush the install. The workmanship warranty may transfer cleanly or may not, depending on how the dealer agreement is written. The original sales rep is long gone in year 5 when you have an issue.
How to tell if a company uses the dealer model: ask the salesperson directly “do your own employees install my system, or do you sub it out?” The honest answer is the test. Also ask “who do I call in year 3 if something fails?” If the answer involves a phone tree that routes between two different companies, that is the dealer model. Sunrun is mostly EPC (with some markets handled by dealer partners). Freedom Forever and Sunnova are mostly dealer. Palmetto is mixed. Local installers are almost always EPC.
NABCEP Certification: The Real Quality Signal
NABCEP (North American Board of Certified Energy Practitioners) is the industry-leading certification for solar professionals. The credential that matters for residential install is the NABCEP PV Installation Professional certification. It requires documented field experience, passing a written exam, and continuing education.
NABCEP-certified installers represent the top 15-20% of the industry by skill. They cost slightly more (because they can charge for the credential), but the install quality is consistently higher, the equipment selection is better, and the workmanship warranty is more likely to be honored.
How to verify: ask the salesperson if any of the company’s installers hold the NABCEP PV Installation Professional credential. Then verify on the NABCEP public registry (nabcep.org). If the company is vague about which specific installer will work on your roof, ask for a name and verify that person individually. If the company refuses to identify a specific NABCEP-certified installer, that is a flag.
Equipment Tier: Where the Margin Hides
The other place to vet is equipment. Solar systems have four major components: panels, inverter, mounting hardware, monitoring. Top-tier and budget-tier equipment can vary by 30-50% on cost, and the difference shows up in long-term performance and warranty claims.
Panels: Tier 1 brands include Maxeon (formerly SunPower), REC Group, Panasonic (exited residential in 2024 but supports legacy installs), Q CELLS, Canadian Solar, LG (exited solar in 2022 but supports legacy), and Silfab. Tier 2 brands include Trina Solar, JA Solar, Jinko Solar, and Longi. Tier 3 brands are generally avoided by quality installers. For the brand comparison deep-dive, see our best solar panel brands piece.
Inverters: top brands are Enphase (microinverters), SolarEdge (DC optimizer + string), Tesla (Powerwall integration), Generac (PWRcell). String inverters from SMA, Fronius, and others are also legitimate. The microinverter vs. string inverter choice is a separate decision; see our microinverter vs string inverter piece.
Mounting hardware: IronRidge, SnapNrack, and Unirac are the major rail brands. For tile and slate roofs, specialized mounting from Quick Mount PV or S-5! is required.
The salesperson should be able to name the exact panel, inverter, and mounting brand they will install on your roof, with model numbers. If they say “we use top-tier equipment” without naming a brand, that is a flag.
Financing Models: Lease, PPA, Loan, Cash
Solar financing affects the economics of ownership more than the price per watt does. The four options:
Cash: you pay the full system cost upfront, you own the system, you claim the federal tax credit, you get all the energy savings. Best long-term economics, worst cash-flow profile. For most homeowners with the cash, this is the right answer.
Solar loan: you finance through a partner bank (GoodLeap, Sunlight Financial, Mosaic, Dividend) at 6-12% interest over 10-25 years. You own the system, you claim the tax credit, you get all the savings minus the loan payment. Watch for dealer fees that get rolled into the loan principal (often 15-30% of system cost, hidden as “financing fees”).
Solar lease: the installer owns the system, you pay a monthly lease payment for 20-25 years. You don’t own the panels, you don’t claim the tax credit, you get reduced energy savings net of lease payment. The lease typically escalates 2-3% per year. Total economic value is much lower than ownership. Common with Sunrun.
PPA (power purchase agreement): the installer owns the system, you pay per kilowatt-hour generated at a fixed rate that is below utility rates initially. Similar economics to lease. Common with Sunrun, Sunnova.
The math: a $25,000 cash system saves you $50,000-80,000 over 25 years (depending on utility rates and net metering). A $25,000 leased equivalent saves you $5,000-15,000 over 25 years. The lease/PPA companies make most of their profit on the spread.
For more on the financial picture, see our solar installation cost 2026 and solar roof tax credit 2026 pieces.
Door-to-Door Sales: The Red Flag You Should Heed
If a salesperson knocks on your door uninvited and pitches solar, the right response is “thank you, I’ll do my own research” and close the door. Door-to-door solar sales have generated more state attorney general actions, consumer protection lawsuits, and CFPB complaints than almost any other home improvement category.
The dynamics: door-to-door sales reps work on commission (typically $1,000-3,000 per closed system, sometimes more). They have powerful incentives to close on the spot, before you can shop the market or talk to your spouse. Common high-pressure tactics include “this discount is only available today,” “the federal tax credit is ending soon” (it isn’t, in 2026), “your utility rate is going up next month and this locks in 2026 rate” (lease/PPA framing), and “we are giving away free solar” (always lease/PPA).
Companies most associated with high-pressure door-to-door sales include Momentum Solar, some Freedom Forever dealers, some Sunnova dealers, and a long tail of smaller dealer networks. The honest companies (Trinity Solar, Palmetto direct, Ion Solar, most local NABCEP-certified installers) also do outbound sales but rely more on inbound leads, referrals, and online channels.
Best practice: get 3 quotes from your own outreach (not from door-to-door reps), insist on EPC companies or verify the dealer relationship clearly, ask for NABCEP-certified installers by name, take 1-2 weeks to compare, never sign on the day of the initial meeting. For broader contractor red flags that apply to solar too, see our red flags roofing contractor and roofing scams pieces.
Warranty Structure: What You Actually Get
Solar warranties come in three layers, each backed by a different party.
Panel warranty (manufacturer, 25-30 years): backed by the panel manufacturer. Covers panel output (typically 80-92% of original at year 25) and panel failure. Strongest with Tier 1 brands. Worthless if the manufacturer goes bankrupt or exits the market (which is why LG and Panasonic exits matter for buyers who installed those panels).
Inverter warranty (manufacturer, 10-25 years): backed by the inverter manufacturer. Enphase microinverters carry 25-year warranty. SolarEdge inverters carry 12-25 years depending on model. String inverters typically 10 years. Inverter replacement at year 10-15 is the most common warranty event in a 25-year solar system.
Workmanship warranty (installer, 5-25 years): backed by the installer. Covers install quality, roof leaks at mounting points, wiring issues, and similar. This is the warranty that becomes worthless if the installer goes out of business. National EPC installers generally honor for the full term. Local installers depend on the business surviving. Dealer-model installers depend on the dealer relationship and how the contract is written.
The honest framing: the workmanship warranty is the riskiest of the three. The way to manage that risk is to either (1) install with an EPC company that has been in business 15+ years and has strong balance sheet, (2) install with a NABCEP-certified local installer who has community ties and will likely still be in business, or (3) accept the risk and budget for self-paying any year 10-25 workmanship issues. For the solar warranty specifics, see our solar roof warranty 2026 piece.
The Vetting Checklist
Before signing any solar contract:
Get 3 written quotes from companies you reached out to (not from door-knockers). Use one national, one regional, one local if you can find all three.
Verify each company’s state contractor license (most states require electrical or solar contractor licensing). Verify the license is active and free of major complaints.
Verify NABCEP certification for the company or the specific installer who will work on your roof.
Confirm EPC vs. dealer. If dealer, get the name of the actual installing company and verify it separately.
Ask for the specific panel, inverter, and mounting brand and model. Verify Tier 1 status of panels.
Read the contract for cancellation rights (most states require 3-day right of cancellation; many high-pressure salespeople try to start install within the cancellation window to prevent it).
Read the financing contract separately. If you are financing, the loan or lease contract is a separate document with its own terms.
Check Better Business Bureau, Google reviews, state attorney general complaint database, and CFPB complaint database for the company.
For installer-vetting workflow, our how to choose solar installer piece walks the full process.
What Net Metering Means for Your Math
Net metering is the state-level policy that determines how much your utility pays you for excess solar energy you send back to the grid. The policy varies wildly by state and by utility, and the policy directly affects the economics of solar.
States with strong net metering (1:1 retail credit for exported energy): currently includes Massachusetts, Maryland, New Jersey, New York, Illinois, and several others, though the rules are eroding. These states give the best solar economics.
States with weakened net metering (NEM 3.0 in California is the most prominent example): California pays roughly 25% of retail rate for exported energy. This changes the economics significantly and pushes residential solar toward battery storage to self-consume rather than export.
States with no net metering or minimal credit: solar still pays back through self-consumption (you use the energy you generate during the day), but the export economics are weak.
For the policy walkthrough, see our net metering explained 2026 piece. The salesperson should be able to walk you through your specific utility’s net metering rules. If they cannot, that is a flag.
The Roof Question: Make Sure Your Roof Is Solar-Ready
Solar panels last 25-30 years. Asphalt shingles last 20-25 years. The math problem: if you install solar on an asphalt roof that is 12 years old, you will be paying to remove and reinstall the solar system in 8-13 years when the roof needs replacement, at a cost of $3,000-8,000.
The fix: if your roof has more than half its life left, install solar. If your roof has less than half its life left, replace the roof first or install solar on a metal roof that will last the full solar life. For more on the solar-metal combination, see our solar panels on metal roof piece. For solar shingles as a hybrid roof+solar product, see our solar shingles vs panels piece.
The Bottom Line
Solar installation companies in 2026 split into nationals, regionals, and locals, with EPC vs. dealer being the biggest structural distinction. Pick a NABCEP-certified installer (verify by name on the registry). Insist on Tier 1 panels and a top-tier inverter (Enphase or SolarEdge). Pay cash or use a transparent solar loan; avoid lease/PPA unless you understand the long-term economics. Get three quotes from companies you reached out to yourself. Never sign on the day of a door-to-door pitch. Verify the workmanship warranty is backed by a company that will likely still exist in 15 years. Do those things and the solar system will deliver the 25-year payback that the brochures promise. Skip them and you may be the customer who pays for the bad reputation the worst operators in this industry have earned.