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If you’re a homeowner searching for the best residential solar installation company in your area, and feeling overwhelmed, you’re not alone. A quality residential solar energy system can last 25 to 35 years. That means choosing the right company is just as important as the panels themselves. At GreenSpark Solar, we’ve helped thousands of New Yorkers make the switch to clean energy. We know what separates a reliable solar partner from one that just wants to “close the deal.”
Below are the top 10 questions to ask when comparing solar installation companies—plus how GreenSpark stacks up.
10 Questions to Ask Prospective Solar Installation Companies
1. How did you determine the size of my solar array?
Why it matters: Some companies oversize your system to inflate your price—or simply “fill the roof” without regard for your actual energy use.
What to look for:
A custom design based on your actual and future energy usage (like EVs or heat pumps)
Site-specific tools to assess sun exposure and shading
Transparent explanation of how the system size was calculated
✅ At GreenSpark, we start with a conversation—not a cookie-cutter design. Every array is tailored to your home’s energy goals.
2. Do you guarantee how much solar energy I’ll produce?
Why it matters: There’s a big difference between the size of your solar array (measured in kW) and the amount of energy it will actually produce (measured in kWh). Factors like roof orientation, shading, pitch, and even your home’s wiring can all impact production.
That’s why a 10 kW system might produce 9,000 kWh on one home and 12,000 kWh on another. A quality installer will take all of this into account—using shading software, historical usage data, and expert analysis—to give you a realistic estimate of how much energy your system will generate.
But not all companies are transparent. Some will inflate these numbers to make savings look better on paper. That’s why it’s critical to ask if they guarantee the production they’re quoting.
What to look for:
A production estimate based on site conditions
A written production guarantee
✅ GreenSpark offers a 90% production guarantee. If your system underproduces, we’ll pay you the difference.
3. What assumptions were used to calculate my projected savings?
Why it matters: Some companies use inflated utility rate projections to make savings seem higher than they are.
What to look for:
Realistic utility inflation assumptions (e.g. 5%)
Transparent, conservative savings estimates
✅ GreenSpark uses your historical utility data and a conservative 5% energy inflation rate—no smoke and mirrors, just honest projections.
4. What solar financing options do you offer?
Why it matters: Financing is the most popular way to go solar today. Flexible options can make solar more affordable.
What to look for:
$0 down options and flexible terms
Simple qualification without tapping home equity
Local or NYSERDA-backed loans
✅ GreenSpark offers exclusive solar-specific financing, including $0 down with no payments for 6 months. We also offer the NYSERDA Smart Energy Loan with rates as low as 3.49%. Explore all the options for buying solar panels for your home.
5. Are your solar consultants paid on commission?
Why it matters: Though there’s nothing inherently wrong with commission-based sales, this model can lead to pressure tactics and misaligned priorities, with salespeople pushing homeowners into decisions that aren’t the right fit. Often, these salespeople lack deep knowledge of solar and are more focused on closing the deal than educating the customer.
What to look for:
Educators, not closers
No pressure to sign on the spot
✅ GreenSpark’s solar advisors are salaried professionals who are focused on education—not quotas. Our goal is to help you make an informed decision, not rush you into one. Our team takes the time to walk you through how solar can work for your home or business, and we never ask for a commitment on the spot. Instead, we follow up a few days later to answer questions and provide additional resources, so you have space to decide what’s best for you.
From start to finish, GreenSpark has been an amazing company to work with. Not only are they top notch with the technical aspect of service, their communication and information sharing is second to none. It's readily apparent that customer service is at the top of their list.
6. What equipment do you use, and why?
Why it matters: There are three essential components of any solar array: panels, inverters, and racking. The quality of each plays a critical role in the system’s performance, longevity, and your overall return on investment.
What to look for:
High-performance panels (e.g. Qcells)
Reliable microinverters (e.g. Enphase)
Secure racking systems (e.g. IronRidge)
✅ GreenSpark only uses top-rated equipment designed to withstand the unique weather patterns of Western New York. We also prioritize US-made manufacturers, including Q-Cells solar modules, Enphase microinverters, and IronRidge racking. As a member-owner of Amicus Solar Cooperative—a network of independent, values-driven solar companies across North America—we have access to the best equipment on the market, vetted across climates from coast to coast.
7. Do you follow local permitting and fire code setbacks?
Why it matters: Town permitting and fire code setbacks are required regulations. However, cities, towns, and villages don’t always monitor these regulations. Some solar companies may forgo these setbacks to fit more panels on your roof to make your savings look more attractive and improve their profit.
If your system violates fire codes or local permitting requirements, you could face fines, delays when selling your home, or be forced to pay for a redesign or removal to bring the array into compliance.
Red flags to look for in your design:
Panels that are placed too close to the ridge or edge of the roof
Panels placed over vents, chimneys, or skylights
✅ GreenSpark designs every system to meet or exceed the latest safety standards and ensure long-term compliance, so you can invest with confidence and avoid costly surprises down the road if you decide to sell your home.
8. Do you offer post-installation service and monitoring?
Why it matters: You need a local partner who supports your system long-term—not someone who disappears after install.
What to look for:
In-house service team, not outsourced
Active monitoring and diagnostics
Warranty support
✅ GreenSpark’s AMP (Active Monitoring Program) offers fast response times, local service techs, and a 5-year workmanship warranty.
9. Are you a NYSERDA Quality Installer?
Why it matters: When choosing a solar company, it’s important to know who’s backing its reputation. NYSERDA (New York State Energy Research and Development Authority) is a state-run organization focused on reducing emissions, boosting the clean energy economy, and ensuring equitable access to sustainable solutions. Each year, NYSERDA evaluates and rates solar installation companies across the state through a rigorous Quality Assurance program.
What to look for:
NYSERDA Quality Installer status (or higher)
Recent and consistent certification
✅ GreenSpark is one of just eight NYSERDA Gold Quality Installers in New York State, earning a 4.0+ score across 12 random project inspections.
10. How experienced is your solar company?
Why it matters: Would you trust someone with only a few years of experience to rewire your home or complete a major renovation? Probably not—and going solar should be no different.
A residential solar installation involves more than just securing panels to a roof. It combines complex electrical work, structural considerations, permitting, and aesthetics. Inexperience can result in costly design mistakes, system failures, or even installer bankruptcies.
What to look for:
NABCEP-certified professionals
Decades of local experience
Proven portfolio of installations
✅ GreenSpark has 23+ years of experience, over 1,000 installations, and a team of NABCEP-certified experts. We’re also a three-time Solar Power World Top Contractor. So, yeah… You could say we know a thing or two.
Why homeowners choose GreenSpark Solar
When you’re investing in clean energy, you need a partner who’s in it for the long haul. At GreenSpark, we’re committed to:
Transparency and education, not pressure
Local service, not national call centers
Honest savings projections, not inflated promises
We’re proud to be one of the best-reviewed solar companies in the region with a near-perfect Google rating and a track record of delivering results.
Ready to go solar with confidence?
Contact us today for a free quote and see why GreenSpark is one of the top-rated solar installation companies for New York homeowners.
