You’ve probably been sitting with a solar quote for a few weeks now, maybe longer. The system looks good, the installer seems legit, and you’ve run the numbers enough times to feel cautiously optimistic. But $28,000 (or whatever your quote says) is not a small check to write, and you’re wondering whether pulling equity out of your home to pay for it is smart or just financially… a lot.

Here’s what I tell people in this exact spot: refinancing to pay for solar is one of the more underused strategies in residential solar financing, and it’s often a better deal than the solar loan the installer quotes you in the same breath as your system price. Not always. But often enough that it deserves a real look.

What “refinancing for solar” actually means

Most people hear “refinancing” and think of a rate-and-term refi, where you swap your old mortgage for a new one at a lower rate. That’s one option, but for solar, you’re almost certainly looking at a cash-out refinance or a home equity line of credit (HELOC). With a cash-out refi, you replace your existing mortgage with a larger one and pocket the difference as cash. A HELOC works more like a credit card against your equity: you draw what you need when you need it.

Both routes let you use your home’s equity to finance solar at mortgage-level interest rates, which are typically far lower than dedicated solar loan products. The tradeoff is that your home is the collateral. That’s not a reason to avoid these products, but it’s a reason to go in clear-eyed.

There’s a third option some people overlook: the FHA Title I or PowerSaver loan programs, and the Fannie Mae HomeStyle Energy mortgage. These are purpose-built for energy improvements and can be rolled into a purchase or refi. I’d start with HELOCs and cash-out refis for most people, but if you’re buying a home and want to finance solar into the mortgage at the same time, the HomeStyle Energy product is worth a conversation with your lender.

How the math actually stacks up

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Financing OptionTypical Rate RangeKey AdvantageMain Consideration
Cash-Out Refi7.0%-7.5%Lower rates than solar loans2-5% closing costs; locks in new rate on entire mortgage
HELOCPrime + marginNo closing costs; keeps first mortgage intactVariable rate risk; CLTV typically capped at 85-90%
Dedicated Solar Loan6.99%-12.99%Fast approval; purpose-builtOften includes hidden 10-25% dealer fee
FHA Title I / PowerSaverVariesCan roll into purchase or refiRequires energy improvement qualification
Fannie Mae HomeStyle EnergyVariesFinances solar into mortgage at purchaseBest for new home buyers

Helpful resource: Emporia Smart Outlet with Energy Monitoring is a top-rated option for this. (As an Amazon Associate this site earns from qualifying purchases.)

Right now, a typical cash-out refinance runs somewhere in the 7% to 7.5% range for a 30-year fixed mortgage, depending on your credit and lender. Compare that to a dedicated solar loan through companies like Mosaic or GreenSky, where rates frequently land between 6.99% and 12.99% depending on your credit profile and whether the installer bakes a “dealer fee” into the loan (more on that in a second).

On the surface, those ranges overlap. But here’s the thing most installers won’t tell you: a large chunk of solar loans carry a hidden dealer fee, where the lender charges the installer 10% to 25% of the loan amount to offer financing, and the installer simply adds that cost to your system price. You pay for it. You just can’t see it. EnergySage’s market data has documented this fee pattern extensively, and it’s one of the biggest quiet costs in residential solar financing.

A HELOC sidesteps that entirely. You call your bank, get a line of credit at whatever rate your equity and credit score qualify you for, and pay the installer directly. No dealer fee. No marked-up system price.

The catch with a cash-out refi specifically is that mortgage closing costs are real. Expect 2% to 5% of the loan amount. On a $30,000 solar addition to a $300,000 refinance, you might pay $6,000 to $15,000 in closing costs depending on lender and location. If your current mortgage rate is already sub-4% from a few years ago, a cash-out refi almost certainly doesn’t make sense right now because you’d be trading a great rate for a worse one on your entire balance. That’s a deal-breaker for a lot of homeowners.

If you locked in a 3.25% rate in 2021, keep that mortgage. Use a HELOC instead.

When a HELOC is the smarter move

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A HELOC keeps your existing first mortgage untouched, which is exactly what you want if your current rate is good. You’re only borrowing what you need, and you only pay interest on what you draw. Variable rates are the main downside. Most HELOCs today are tied to the prime rate plus a margin, so the monthly payment can shift. That’s genuinely a risk if rates spike, and you should factor it in rather than assume rates only go one direction.

The practical minimum equity threshold to make a HELOC work comfortably: most lenders want to keep your combined loan-to-value (CLTV) under 85% to 90%. So if your home is worth $400,000 and you owe $300,000, you’ve got $100,000 in equity but your usable HELOC capacity is typically $40,000 to $60,000 depending on the lender. Plenty for a solar system. Less plenty if you’ve recently done other large projects and already have a HELOC balance.

Run these numbers before you request a quote from the lender. Walking in with your own math will save you time and make you a better negotiator.

The 30% federal tax credit changes everything

This is where refinancing to pay for solar gets genuinely compelling. The federal Investment Tax Credit (ITC) currently sits at 30% of the total installed system cost. If your system costs $28,000, you get an $8,400 credit against your federal tax liability in the year the system is installed. That’s not a deduction. It’s a dollar-for-dollar reduction in what you owe.

Here’s what I tell people: if you finance the whole system through a HELOC, then apply the ITC to immediately pay down that HELOC balance, you’ve effectively funded a $28,000 solar system for $19,600 out of pocket. The NREL has documented that the ITC is the single biggest driver of residential solar payback periods, and it absolutely affects whether a refi-based financing strategy makes sense.

One caveat. You need to actually owe $8,400 in federal taxes to use the full credit in year one. If your tax liability is lower, the remaining credit rolls forward to subsequent years, but that delays your payback timeline. Worth checking with a tax professional before you commit.

A quick word on home value

There’s a real equity case to be made here. A Lawrence Berkeley National Laboratory study found that solar panels add roughly $4 per watt to home sale prices on average. A 7-kilowatt system (pretty typical for a three-bedroom house) would add around $28,000 in home value by that estimate. If you’re financing solar through a HELOC and the solar simultaneously increases your home’s appraised value, you’ve essentially borrowed against an asset and improved that asset at the same time.

I know that sounds almost too tidy. It is, a little. Home value premiums vary by market, buyer, and how recently the equipment was installed. But the directional point holds: solar equity is usually real equity, and that matters when you’re deciding whether to borrow against your home to fund the project.

If you’re still on the fence, a home energy monitor like the Emporia Vue (the site may earn a commission on that link) is worth installing before you commit to a system size. Knowing your actual consumption baseline means you buy what you need and not a kilowatt more.

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Disclosure: As an Amazon Associate, we earn a small commission from qualifying purchases at no extra cost to you. We only recommend products that genuinely support the topics covered in this article.

Disclosure: As an Amazon Associate, we earn a small commission from qualifying purchases at no extra cost to you. We only recommend products that genuinely support the topics covered in this article.