5.0 Rating
Request A Free Estimate
Going solar in 2026 looks different than it did a year ago.
The 30% federal tax credit no longer applies if you buy with cash or a loan, system sizing and installer quality still make or break your savings, and net metering rules vary a lot by state.
This guide walks through the eight mistakes that cost Northeast homeowners the most money, and how to avoid each one.
Solar panels are one of the biggest investments you’ll make in your home.
Done right, they can cut your electric bill for the next 25 years.
Done wrong, they can leave you locked into a system that’s too small, too expensive, or installed by a crew that cuts corners.
Common mistakes homeowners make when going solar often come down to timing, sizing, and who they trust with the install.
Some of these mistakes cost a few hundred dollars.
Others cost tens of thousands over the life of the system.
This guide covers the eight mistakes we see most often from homeowners across Connecticut, Massachusetts, Maine, New Hampshire, Rhode Island, Vermont, and Virginia, and exactly what to check before you sign a contract.
GET HELP BUILDING YOUR SOLAR SYSTEM
The biggest mistake is assuming the 30% federal solar tax credit still applies if you pay cash or take out a loan.
That credit, known as Section 25D, ended for homeowner-owned systems installed after December 31, 2025.
Homeowners who plan their budget around a credit that no longer exists can be caught off guard by thousands of dollars in unplanned costs.
For years, the Residential Clean Energy Credit let homeowners claim 30% of their solar installation cost back on their federal taxes.
That changed with the One Big Beautiful Bill Act, signed in July 2025.
The law ended the credit for systems installed after December 31, 2025 that homeowners own outright, whether paid for in cash or financed with a loan.
If you’re planning to own your system, that 30% is no longer coming off your tax bill.
That doesn’t mean solar stopped making financial sense.
Electricity rates across the Northeast remain high enough that most homeowners still see a payback period of five to seven years, with or without the federal credit.
It does mean the math changed.
Third-party-owned systems, meaning solar leases and power purchase agreements, can sometimes still pass along a related tax credit through the company that owns the panels.
Before you decide how to pay for your system, it’s worth understanding the residential tax credit landscape as it stands today, not as it stood last year.
Skipping a roof inspection before solar installation is a mistake because panels are built to last 25 years or more, and your roof needs to outlast them.
If your roof needs replacing in 10 years, you’ll pay to remove and reinstall the entire solar array just to get at the roof underneath it.
Solar panels are a long commitment.
Once they’re mounted, taking them off and putting them back on for a roof repair or replacement can cost thousands of dollars in labor alone.
A roof that’s already showing wear, cracked shingles, soft spots, or old flashing, should get fixed before panels go up, not after.
A professional roof inspection checks the age, material, and structural condition of your roof so you’re not stacking a 25-year investment on top of a roof that won’t make it that long.
This step gets skipped more often than you’d expect, mostly because homeowners are focused on the panels themselves and assume the roof underneath is someone else’s problem to flag.
It’s actually the first thing a careful installer should check.
A solar system that’s the wrong size either leaves you still paying a real electric bill every month, if it’s too small, or paying for panels that produce more power than your utility will credit you for, if it’s too large.
Getting the size right starts with your actual annual electricity usage, not a rough guess.
If your system only covers half your usage, you’ll still see a real bill every month, and within a couple of years you may be asking about adding more panels.
Installers sometimes undersize systems by 20 to 30 percent by using generic estimates instead of your actual usage history, roof shading, and local weather patterns.
An oversized system produces more electricity than your home can use and more than your utility will credit back to you under net metering.
That extra production is money you spent but can’t recover.
Some sales reps oversell system size to inflate the price of a project, so it pays to ask exactly how your number was calculated and to check it against how panel wattage and count affect total output for a home your size.
The cheapest quote isn’t always the best deal.
A low bid can mean lower-grade panels, a rushed install, or a crew that’s not certified to work on your specific roof type.
Look for installers who hold NABCEP certification, the industry’s recognized standard for solar installation knowledge and ethics.
It’s not a legal requirement to install solar, but it’s a strong signal that the people on your roof actually know what they’re doing.
Before you sign anything, read verified customer reviews from homeowners who used that installer, not just the testimonials on the company’s own homepage.
Ask how long the company has been installing in your specific state, since permitting and utility interconnection rules vary.
Buying with cash gives you the highest long-term savings and full ownership of any state incentives, but it requires the biggest upfront cost.
A loan comes close to those savings if you avoid high dealer fees.
A lease or power purchase agreement lowers your upfront cost, but a third party, not you, keeps most of the tax benefits and the home value increase.
Cash purchases still win the math over 25 years in nearly every comparison, because there’s no interest and no middleman.
But cash isn’t an option for every household, and that’s where things get more complicated.
A solar loan can get close to cash-purchase savings, but only if you watch for dealer fees baked into the loan balance.
A 0% loan with a 20% dealer fee can end up costing more than a 5% loan with no fee at all.
It’s worth asking your installer to itemize that fee separately.
Leases and power purchase agreements lower your upfront cost to close to nothing, and in some cases still qualify for a related tax credit through the company that owns the system.
The tradeoff is that you don’t own the equipment, so you don’t capture the resale value increase or state-level incentives yourself.
Before deciding, it’s worth comparing solar financing options side by side for your specific household budget rather than taking the first quote that lands in your inbox.
Net metering is the program that credits you for extra electricity your panels send back to the grid.
Without it, that surplus power is essentially free to your utility.
The value of those credits, and whether they exist at all, depends on your state and your utility, and the policies keep changing.
Utilities across the country are moving away from paying homeowners full retail price for excess solar power, and the changes vary significantly from state to state.
Some states still offer strong credit rates.
Others have scaled theirs back for new solar customers while protecting homeowners who installed earlier under a grandfather clause.
Rhode Island homeowners, for example, benefit from a current set of state-specific solar incentives that go beyond net metering alone, including sales and property tax exemptions.
Vermont has its own mix of clean energy incentives that can shift the payback math in a homeowner’s favor even without the federal credit.
The takeaway is that two homes with identical systems in different states, or even different utility territories within the same state, can see very different savings.
Ask your installer for the specific net metering rate and program status in your town, not a generic answer about your state.
Not every panel on the market performs the same way, and the differences show up over 25 years, not in the first month.
Panel efficiency, warranty length, and the inverter technology behind the system all affect how much power you actually get and how long the system lasts.
Microinverters, for instance, let each panel operate independently, so one shaded or underperforming panel doesn’t drag down the output of the whole array the way some older inverter setups can.
A 25-year warranty on both the panels and the workmanship matters more than a slightly lower price today.
Before comparing quotes on price alone, ask what panel and equipment brands are actually being proposed, and whether the warranty covers performance, not just hardware defects.
Solar usually reduces your electric bill significantly, but rarely eliminates it completely unless your system is paired with battery storage and sized generously for your usage.
Most homeowners still pay a small monthly utility connection fee, and usage can creep up over time as needs change.
It’s a reasonable goal to aim for, but going in expecting a $0 bill forever can set you up for disappointment.
Seasonal changes in sunlight, added appliances like an EV charger, and utility fees that exist regardless of how much power you generate all affect the final number on your bill.
What solar reliably does deliver is a major reduction in what you owe the utility each month, plus a bump in what your home is worth if you ever sell.
Getting a realistic estimate starts with understanding how residential solar systems actually perform for a home like yours, not the best-case number in a sales presentation.
Every mistake above comes down to the same root cause: not having enough information before signing a contract.
That’s the gap we try to close for homeowners across Connecticut, Massachusetts, Maine, New Hampshire, Rhode Island, Vermont, and Virginia.
Our installers hold NABCEP and ICC certifications, and our process starts with a full roof inspection before any panel ever goes on order, so you’re not stacking a 25-year system on a roof that won’t last that long.
We size every system around your actual usage history and roof conditions, not a generic estimate pulled from a database.
We also walk homeowners through every financing path available, cash, loan, lease, or power purchase agreement, so you understand exactly what you’re signing and what it means for your taxes, your equity, and your monthly budget.
And because we also handle roofing and gutters, we can take care of the roof work your solar installation depends on without bringing in a second contractor.
If you’re weighing whether solar still makes sense for your home in 2026, Sunergy Solutions can walk you through the real numbers for your specific roof, usage, and state incentives before you commit to anything.
The most common mistake in 2026 is assuming the 30% federal solar tax credit still applies to a cash or financed purchase. That credit ended for homeowner-owned systems installed after December 31, 2025, though some leased or third-party-owned systems can still pass along a related credit.
Not for homeowners who buy their system outright with cash or a loan. The Residential Clean Energy Credit, known as Section 25D, ended for systems installed after December 31, 2025. Some solar leases and power purchase agreements may still qualify for a related credit through the company that owns the equipment.
A professional roof inspection is the only reliable way to know. It checks the age, material, and structural condition of your roof so you can be confident it’ll last as long as the solar panels, which are typically warrantied for 25 years or more.
The right size depends on your actual annual electricity usage, not a generic estimate. A good installer will review your utility bills, roof space, and shading before recommending a system size, rather than guessing based on your home’s square footage alone.
Buying with cash offers the highest long-term savings and lets you keep any state incentives and home value increase for yourself. Leasing lowers your upfront cost and may still offer tax benefits through the leasing company, but you won’t own the equipment or capture those extra savings.
In most states, yes, though credit rates and rules vary by state and utility and have been changing. Even where net metering credits have been reduced, high electricity rates across the Northeast still make solar a strong long-term investment for most homeowners.
Appointments Available, 7 Days a Week
