Home Equity Loan vs Solar Loan in 2026: What You Risk, What You Pay

A home equity loan uses your house as collateral; if you can't repay, the lender could foreclose. A solar-specific loan may be offered by the salesperson with the solar sale, and its principal may include a dealer fee. Compare total cost and risk.

Two things changed the math recently. The 30% federal homeowner credit (section 25D) does not apply to systems whose installation is completed after December 31, 2025, according to the IRS. A system you buy with cash or any loan and finish in 2026 gets no federal credit. And Lawrence Berkeley National Laboratory's August 2026 data update shows loan-financed home systems with a 2025 median price of $4.5 per watt, against $3.0 for cash purchases.

What is the difference between a home equity loan and a solar loan?

A home equity loan borrows against your house's equity, which the CFPB defines as what the property is currently worth minus the amount of any existing mortgage on it. A solar-specific loan may be offered by the salesperson alongside the solar sale, and its principal may include a dealer fee. The biggest differences are collateral and how the fee is disclosed.

The CFPB says a home equity loan pays out as a lump sum and usually has a fixed rate that will not change. Its HELOC brochure says a second mortgage or home equity loan typically has equal payments that pay off the whole loan, and you need a new application if you want more money. A home equity line of credit (HELOC) instead lets you borrow, spend and repay as you go, with the home as collateral.

The CFPB says some solar loans are secured by collateral, typically with a lien on the panels themselves, while others are unsecured. Your loan documents say which applies and whether the lender takes a security interest in your home. That answer drives most of what follows.

What do I risk if I can't make the payments?

With a home equity loan or HELOC, you risk your house. The CFPB says that if you can't repay a home equity loan, the lender could foreclose, and if you fall behind on a HELOC, you could lose your home. With a solar loan, the risk depends on what secures it. The California Public Utilities Commission says some solar loans place a lien on your property, and missed payments could then result in foreclosure.

The CFPB also notes that when a HELOC's draw period ends, you either enter a repayment period, often 10 or 15 years, or may owe the whole balance at once as a balloon payment. If you can't pay that, you could lose the home. If you sell, you are generally required to pay off a HELOC in full right away.

Solar savings don't change that risk. The CFPB's August 2024 solar financing spotlight says there is no guarantee a solar loan will pay for itself. If the panels save less than you expected, a home equity payment is still due on the same terms.

For what happens to an owned or leased system at sale, see what happens to your solar when you sell your house.

How do dealer fees change what a solar loan really costs?

A dealer fee is a markup the lender adds to the loan principal above the cash price. The CFPB says these fees typically run 10 to 30% of the cash price and can exceed 50%. Lenders often don't label them as a markup, so the loan can look cheaper than it is.

The CFPB's example: a $30,000 cash price with a $9,000 hidden fee becomes a $39,000 loan principal plus interest. The lender pays the installer $30,000 and keeps $9,000. The CFPB says lenders typically leave these fees out of the total cost of credit they show consumers, and stated APRs (annual percentage rates) often don't include them.

Berkeley Lab's medians point the same way. These are medians across different systems, not measured fees. Berkeley Lab says the gap is potentially due in part to loan origination fees rolled into the up-front price. Its financing labels cover only the roughly 45% of host-owned systems where the type could be determined with high confidence. Still, the gap shows why you should get the cash price in writing.

Berkeley Lab reports these in 2025 dollars per watt DC, before incentives. In 2025, the gap works out to $1,500 per kilowatt of system size. The CFPB says home equity loans may have their own upfront fees and costs, covered below. More on spotting the fee: solar loan dealer fees.

Is the rate fixed or variable?

A home equity loan usually has a fixed rate, per the CFPB. A HELOC typically has a variable rate. A solar loan's rate and payment schedule are set in its note. The CFPB's August 2024 spotlight says the most common solar financing is fixed-term, usually fixed-rate installment loans, and that it is commonplace for solar-specific loans to re-amortize to a higher monthly payment at the 19th month unless you make a substantial prepayment first. It said that prepayment is frequently 30 percent of the loan principal, which matched the size of the federal tax credit at the time.

The CFPB says HELOCs generally let the lender freeze or reduce your line if your home's value falls or your finances worsen. Some let you convert part of the balance to a fixed rate, typically higher than the variable rate. For a variable-rate line, Regulation Z counts the circumstances under which the rate may increase, the limits on the increase and its effect as material disclosures.

On solar loans, ask how large a prepayment avoids the higher payment. If anyone suggests covering it with a federal tax credit, remember that a system bought and finished in 2026 gets none. See why a solar loan payment can go up.

What closing costs come with each option?

Home equity loans may have upfront fees and costs, and HELOC costs may include an appraisal fee, an application fee and closing costs, per the CFPB. Some lenders waive some or all of a HELOC's up-front costs. For a solar loan, the CFPB's concern is the dealer fee inside the principal, which lenders typically leave out of the total cost of credit they show consumers.

The CFPB says a HELOC application fee might not be refunded if you're turned down. In general, the lender can't charge a nonrefundable fee until three days after you receive the disclosures. If the lender changes terms before the loan is made, you can decline and get your fees back, unless only the variable rate changed. The CFPB says a cash-out refinance generally has higher closing costs and also puts the home at risk.

The CFPB's advice for home equity loans applies to both: compare more than the monthly payment.

Can I cancel after I sign?

If the loan is secured by your principal home, federal Regulation Z lets you cancel in writing. The deadline is midnight of the third business day after closing, delivery of the cancellation notice, or delivery of all material disclosures, whichever comes last. A loan not secured by your home doesn't get this right, though the solar sale may.

Key points from Regulation Z section 1026.23 and section 1026.15 for home equity lines:

• If the notice or material disclosures aren't delivered, the right lasts until 3 years after closing, a transfer of all your interest, or a sale, whichever comes first.
• Material disclosures are the APR, finance charge, amount financed, total of payments and payment schedule, plus certain others. For a HELOC, they include payment terms for both the draw and repayment periods.
• You must cancel in writing, but you don't have to use the lender's form. Regulation Z sections 1026.23 and 1026.15 both say mailed notice counts as given when mailed.
• If several people have the right, one person cancelling cancels for all. A person with an ownership interest in the home can have the right even without signing the loan.
• A second or vacation home you don't live in now isn't covered. Loans to buy or build your main home are exempt, as are loans where a state agency is the creditor.
• On a HELOC, each draw within your credit limit doesn't create a new right to cancel.
• You can waive the waiting period only for a genuine personal financial emergency, in a dated written statement signed by everyone with the right. Printed waiver forms are prohibited.

Regulation Z gives an example: a line opened Friday, June 1, with disclosures and the cancellation notice given May 31, can be cancelled until midnight Tuesday, June 5. The CFPB says that when you cancel a HELOC in that window, the lender must return fees paid, including application and appraisal fees.

The sale contract has separate rules. The CFPB notes door-to-door solar sales may fall under the Federal Trade Commission (FTC) Cooling-Off Rule's three days to cancel. Florida home-solicitation sales can be cancelled until midnight of the third business day (s. 501.025). Under s. 501.021, a business day is any calendar day except Sunday or a federal holiday, and a home solicitation sale doesn't include a sale that results from your request for specific goods or services. For solar agreements, Florida's s. 520.23 also lists, where applicable, a notice of your right to rescind for at least 3 business days after signing, with an exception for some solar communities, so check the separate disclosure statement that comes with your agreement. Texas residential solar contracts signed on or after September 1, 2025 carry a 5-business-day cancellation right, per the Texas Department of Licensing and Regulation (TDLR).

Is the interest tax-deductible?

For home equity debt, possibly. IRS Publication 936 says interest on home equity loans and lines is deductible only if the money is used to buy, build or substantially improve the home that secures the loan, that home is your main or second home, you itemize on Schedule A, and other requirements are met. Whether your solar project qualifies is a question for a tax professional.

Publication 936 (2025) calls an improvement substantial if it adds to the home's value, prolongs its useful life or adapts it to new uses. Repairs such as repainting don't count. Other points:

• The deduction covers interest on the first $750,000 of combined debt on your main and second homes ($375,000 if married filing separately). Higher limits apply to debt incurred before December 16, 2017.
• A loan taken within 90 days after the work is completed can be treated as acquisition debt, limited to costs from 24 months before completion through the loan date.
• Points on a loan to substantially improve your main home can be fully deducted in the year paid if the publication's tests are met.

Publication 936's rules are for loans secured by your home. If a solar loan isn't secured by the home, ask a tax professional whether any of its interest is deductible.

What should I check before signing either loan?

Get the cash price, the loan principal and every fee in writing, then compare total cost, what secures each loan and your cancellation deadlines.

1. Get the installer's cash price in writing and compare it with the solar loan principal.
2. Ask the lender to state any dealer fee as a dollar amount.
3. Ask in writing whether the solar loan takes a security interest in your home, and whether you'll get a notice of the right to cancel.
4. Find out whether the rate is fixed and whether the payment rises at month 19 without a prepayment.
5. If a proposal shows a "net cost" after a federal credit on a 2026 cash or loan purchase, ask for the full figure. The CFPB warns that net-cost framing can make people think it's the loan principal.
6. List every home equity fee: appraisal, application, closing costs, and whether any are waived.
7. For a HELOC, check the draw period, the repayment terms, any balloon payment and when the lender can freeze the line.
8. Write down the date your loan cancellation right ends and, separately, the sale contract's cancellation deadline.
9. Ask a tax professional before counting on an interest deduction.
10. Check what you'd owe if you sell the house.

For the wider choice, see solar loan vs lease vs cash and what ended with the 30% federal credit.

Can Solnology help me compare a loan offer with the cash price?

Solnology is an independent solar broker. Ask any installer that quotes you for its cash price and its financing terms so you can compare them. Request quotes, which asks for your phone number with your consent, or book a ten-minute call. If you move forward with a solar project, we share the relevant details with the installation partner quoting your project. Our pay comes from the installer, who may pay us if a deal closes; you never pay us anything.

Sources: Consumer Financial Protection Bureau (Regulation Z sections 1026.23 and 1026.15; HELOC brochure, August 2022; "What is a home equity loan," September 11, 2024; Solar Financing Issue Spotlight, August 2024); IRS Publication 936 (2025) and IRS energy credit FAQs; Lawrence Berkeley National Laboratory, U.S. Distributed Solar and Storage: 2026 Data Update (August 2026); Florida Statutes ss. 501.021, 501.025 and 520.23; Texas Department of Licensing and Regulation; California Public Utilities Commission, California Solar Consumer Protection Guide. This is not legal or tax advice. Confirm current terms with your lender, installer or program before you sign. Sources checked October and November 2026.