How to Pay for a Heat Pump: Financing, Loans and On-Bill Programs

A heat pump is a five-figure purchase for most homes, and unlike a car or a kitchen, it usually gets bought under pressure — the old furnace died, it’s November, and the installer needs an answer today.

That pressure is exactly what makes financing expensive. The offer in front of you at that moment is almost never the cheapest one available to you. It’s just the one that’s convenient.

This guide walks through every realistic way to pay: cash, contractor financing, on-bill programs, green bank loans, home equity, personal loans and credit cards. For each one, what it typically costs, what it’s good for, and the specific trap to watch for. Then a worked example that shows honestly whether your energy savings actually cover the payment — because sometimes they don’t.

1. Do this before you borrow anything

Every dollar of rebate is a dollar you don’t finance, and the interest on that dollar too. So the order of operations matters more than the loan you pick.

Start by pinning down your real net cost. That means three things: a firm quote from at least three installers on comparable equipment, every incentive you actually qualify for, and a clear-eyed look at what you’d have spent anyway.

That last one gets skipped constantly. If your gas furnace is 22 years old and cracked, you were about to spend money regardless. The honest comparison isn’t “heat pump versus zero” — it’s “heat pump versus the furnace-and-air-conditioner replacement you’d otherwise be buying.” On that basis the amount you need to finance is often a lot smaller than the sticker suggests. Our 2026 cost guide has installed price ranges for both paths.

Then subtract incentives. There’s no federal tax credit for a system placed in service in 2026 — the Section 25C credit ended for property placed in service after December 31, 2025, so budget zero there. But utility rebates, state programs and income-based state-run rebates are all still live, and some of them are large. We cover the whole landscape in heat pump rebates in 2026, and the background on what changed in what to do now the federal credit has ended.

One more step before you borrow: make sure the equipment is right. A financing decision is reversible; a badly sized system is not. Insist on a Manual J load calculation rather than a rule-of-thumb estimate, and if you’re not certain a heat pump is the right call for your house at all, work through is a heat pump right for my home first.

2. Paying cash, and why it usually wins

The boring answer is usually the right one. If you have the money sitting in a savings account and you can spend it without touching your emergency fund, paying cash is almost always the cheapest total cost.

The arithmetic is simple. On a $12,000 balance financed at 7.5 percent over seven years, you’d pay roughly $3,400 in interest over the life of the loan. That’s a meaningful fraction of the equipment cost, and it buys you nothing. Cash also gives you leverage: some contractors will discount modestly for a cash or check payment because they avoid the fee that lenders charge them on financed jobs.

But cash isn’t automatically right, and there are two situations where it isn’t.

The first is if paying cash leaves you without a cushion. A heat pump is a planned expense; a car transmission is not. Draining a three-month emergency fund to avoid $3,400 of interest is a bad trade if it means putting the next surprise on a credit card at 22 percent. Keep the cushion, borrow the difference.

The second is a genuine 0 percent offer with a real term — a state HEAT-Loan-style program, say. If the money is truly free, holding your cash and paying over seven years is usually better than spending it, especially if that cash is earning anything at all in a savings account. The key word is genuine, which brings us to the next section.

3. Contractor financing and the 0% trap

Nearly every HVAC company offers financing through a third-party lender, and the application takes about five minutes on a tablet in your living room. That convenience is genuinely useful when a system fails in January. It’s also where the most expensive mistakes get made.

Contractor financing comes in three flavours, and they are not equally good.

True 0% APR promotions. Real waived interest for a set period, commonly 12 to 24 months. If you can clear the balance inside the window, this is excellent — free money. The monthly payment required to clear a $12,000 balance in 18 months is about $667, though, so be honest about whether that fits your budget.

Deferred interest promotions. These look identical in the marketing. “No interest if paid in full by [date].” The difference is what happens if you don’t. Interest has been quietly accruing on the balance the entire time, and if any amount remains when the promotional period ends — even one dollar — you’re charged all of it retroactively, at the card’s standard rate. The Consumer Financial Protection Bureau has raised concerns about exactly this structure, noting these promotions can surprise consumers with high retroactive charges, and has found that roughly one in five deferred-interest promotional balances ended up having interest imposed retroactively.

To put numbers on it: if you carried an average balance of around $6,000 across an 18-month deferred-interest promotion and missed the payoff by a little, at a standard rate near 27 percent you could be looking at something in the region of $2,400 in accrued interest landing on one statement. The exact figure depends on your balance history and the lender’s method, but the shape of it is always the same — a large, unexpected bill.

Fixed-rate instalment loans. The everyday option: a fixed rate over 5 to 15 years, no promotional cliff. Rates offered through contractor channels vary widely with credit score and typically land in the high single digits to mid teens. These are honest products, but there’s a wrinkle: lenders charge the contractor a fee on financed jobs, commonly reported in the mid single digits to low double digits of the project value, and that fee is generally built into the price you’re quoted. So the “same price, financed or not” you may be told is often not quite true.

4. On-bill financing and on-bill repayment

This is the option most homeowners have never heard of, and in the states where it exists it’s often the best deal on the table.

The idea is straightforward. The utility — or a lender working with the utility — funds the installation, and you repay through a line item on the energy bill you already receive every month. The Environmental Protection Agency draws a useful distinction: in on-bill financing the utility itself lends the money, while in on-bill repayment a bank or credit union lends it and the utility just collects. Either way there’s typically little or nothing to pay upfront.

Why these are attractive: rates are frequently zero or very low, because the funding comes from ratepayer efficiency budgets or public capital rather than a commercial lender chasing a margin. Terms commonly run 1 to 10 years. Credit requirements are often lighter than a bank loan, since the utility can see your payment history on the account already — which makes these programs genuinely useful for households that would struggle to qualify elsewhere. And repayment is designed, at least in principle, to be roughly offset by the energy savings.

Programs exist in a scattered set of states and utility territories, including through rural electric co-ops and municipal utilities, and coverage keeps expanding. Some large investor-owned utilities offer sizeable on-bill limits for residential decarbonisation work. Because availability is so patchy, the only way to know is to check your own utility’s site — the same first stop we recommend for rebates.

The other thing to check is whether participating locks you into a specific contractor list or equipment list. Many on-bill programs do, for the same reason rebate programs do — they want verifiable savings. That’s usually fine, but confirm your preferred installer is on it before you get attached to a quote. Our guide to what to expect during installation covers what a compliant job looks like.

5. Green banks and state efficiency loans

A green bank is a public or quasi-public institution that uses public money to make clean energy projects cheaper to finance. Several states run one, and a handful of them offer some of the lowest heat pump rates in the country.

Two concrete examples, both verifiable on the program’s own site as of this writing:

Connecticut Green Bank’s Smart-E Loan ran a heat pump special offer at 1.99 percent for a five-year term from August 1 to December 31, 2026, with up to $25,000 at that rate and blended rates above it, up to a $50,000 program maximum. It requires an Eversource or Avangrid account, an approved Energize CT heat pump rebate, and a contractor in the utility’s heat pump installer network. The rate before that offer was even lower, which tells you these promotions move — check the current one.

Massachusetts runs the Mass Save HEAT Loan, widely described as 0 percent interest for qualifying efficiency work, commonly cited at up to $25,000 over terms of up to seven years, with no origination fee and no prepayment penalty. Note that in 2026 the qualifying product list excludes R-410A equipment, so only R-32 and R-454B systems make the cut — a consequence of the wider move away from R-410A in new residential equipment.

Beyond those, a number of states run low-interest energy loan funds through their energy office, housing finance agency or a partner credit union. Rates typically sit well below commercial personal loan pricing, terms run 5 to 15 years, and many are unsecured — meaning your house isn’t collateral. Some are income-tiered, with the best rates for lower-income households.

The trade-off with these programs is process. They usually require rebate pre-approval, a listed contractor and a listed product, and the paperwork adds a week or three. If your system has already failed and you’re heating with space heaters, that delay is real. If you’re planning ahead, it’s the cheapest money you’ll find.

6. Home equity loans and HELOCs

If you have equity in your home, borrowing against it is the cheapest mainstream option after the subsidized programs. It is also the one that deserves the most caution.

A home equity loan is a fixed-rate second mortgage: you take a lump sum and repay it over a set term. As of early September 2026, published national averages for fixed home equity loans sat in roughly the 7.3 to 8.1 percent range depending on which survey you read, with the best rates going to borrowers with high credit scores and low combined loan-to-value ratios. Terms commonly run 5 to 20 years.

A HELOC is a revolving line you draw on as needed, usually at a variable rate. National averages in early September 2026 were reported around 7.2 to 7.3 percent, with some sources noting rates at their lowest point of the year. HELOCs typically have a draw period followed by a repayment period, and because the rate floats, your payment can rise.

Both are cheaper than unsecured borrowing for a simple reason: your house is the collateral.

Practical considerations. Closing costs on home equity products can run from nothing to a few percent of the line, so a low headline rate on a small balance can be a false economy — compare total cost, not APR alone. Approval usually takes two to six weeks, which rules it out for emergency replacements. And drawing on your equity reduces what’s available for other needs later.

Cash-out refinancing is a fourth possibility but rarely makes sense for a single project unless you were refinancing anyway, because you’d be resetting the rate on your entire mortgage to fund a five-figure purchase.

7. Personal loans and credit cards

When the subsidized options don’t exist in your area and you don’t have or don’t want to use home equity, an unsecured personal loan is the sensible fallback.

Personal loan rates averaged just above 12 percent in reporting from early September 2026, with a wide spread — strong credit can land well under that, weaker credit well over. Terms typically run 2 to 7 years. The advantages are speed (funding in days, sometimes same-day), no collateral, and a fixed payment with a definite end date. The disadvantage is the rate, and origination fees of 1 to 8 percent that some lenders deduct from the amount you receive.

Credit unions are worth a specific mention here. They frequently price personal loans below bank and online lender averages, and some run dedicated home improvement or energy-efficiency products at better rates than their general personal loan. If you belong to one, ask before you apply anywhere else.

That leaves credit cards, which should be your last resort and rarely anything else. Cards accruing interest averaged around 22 percent APR in Federal Reserve data for the second quarter of 2026. On a $12,000 balance, that’s roughly $220 a month in interest alone before you reduce the principal at all. There are two narrow cases where a card makes sense: a genuine 0 percent purchase APR offer you’re certain you can clear within the promotional window, and a short bridge of a few weeks while a rebate check or loan disbursement clears.

8. Every option, side by side

Rates below reflect published national averages and program pages around early September 2026. They move, and your offer will differ. Use this to narrow the field, then get real quotes.

Compare the total cost of credit, not the monthly payment. Stretching a loan two years longer always makes the payment look better and the deal look worse.

— the single most useful rule in this guide

9. Worked example: does the saving cover the payment?

Here’s the honest version of a calculation that gets presented far too optimistically.

The setup. A $14,000 ducted heat pump installation. A $2,000 utility rebate applied to the invoice leaves $12,000 to finance. The house needs about 50 million BTU of heat a year — a reasonable middle figure for a typical single-family home in a moderate climate. We’ll use mid-2026 national average energy prices: about 18 cents per kWh for electricity, roughly $1.90 per therm for natural gas, about $2.60 a gallon for propane and about $3.50 a gallon for heating oil. Your local prices will differ, sometimes a lot.

The heat pump is assumed to run at a seasonal COP of 3.0, which costs roughly $880 a year to heat that home. Now compare against what you’re replacing, financed at 7.5 percent over seven years — a payment of about $184 a month.

Read that table carefully, because it’s the point of this section. At a commercial interest rate, the energy saving does not cover the loan payment in any of these cases. Anyone who tells you a heat pump “pays for itself monthly” is either assuming a subsidized loan, ignoring the loan entirely, or replacing electric resistance heat in a very expensive electricity market.

Now change one variable — the financing — and watch what happens. Same $12,000, but through a 0 percent state efficiency loan over ten years, the payment is exactly $100 a month.

Replacing electric resistance heat with a subsidized loan genuinely nets positive from month one. Everything else is cash-flow negative during the loan term and positive afterward — which is fine, as long as nobody pretended otherwise.

Run your own version with your actual rates and quotes in our heat pump cost calculator. And if you’re on natural gas specifically, read heat pump vs furnace before you commit — in cheap-gas regions the honest answer is sometimes a dual-fuel system rather than a full swap.

10. 6 mistakes that cost real money

11. Frequently asked questions