Estimate the monthly payment on a furnace, AC, heat pump, mini-split, or ductwork replacement. Pick the system, enter the installed price, subtract any tax credit or rebate, and add your lender's APR and term. Illustrative only, never a loan offer.
Illustrative estimate only. Not a loan offer, application, or guaranteed rate. Enter the APR and term your lender or the manufacturer's program actually quotes. Treat any tax credit or rebate as an estimate and verify the current IRS 25C limits and your utility's current rebate before you count on a figure. Confirm real terms with your financing provider before you sign.
A new heating and cooling system is one of the largest unplanned home expenses most people ever face, and it usually arrives at the worst time: the furnace dies in a January cold snap or the AC quits in an August heat wave. A 9,000 to 15,000 dollar lump sum feels impossible, but the same job framed as a fixed monthly payment feels manageable. This calculator estimates that monthly payment from the system you are replacing, the installed price your contractor quoted, any tax credit or rebate you subtract, your down payment, and the exact APR and term your lender offers. It is a planning estimate, not a loan offer.
Unlike a roof, which is priced per square, an HVAC job is priced by what equipment is going in and how much of the system you touch. That is why two homes on the same street can finance wildly different amounts. The biggest lever is scope:
One honest note: the right system size comes from a Manual J load calculation done in your home, not from square footage alone. This tool finances the price you were quoted, it does not size your equipment.
High-efficiency HVAC is one of the few home upgrades with real money on the table. The federal energy-efficient home improvement credit (commonly called 25C) can apply to qualifying heat pumps, central AC, and furnaces, and many electric utilities and state programs add their own rebates on top. The catch is timing and eligibility: the federal credit is claimed on your tax return, not handed back at the counter, and both the federal rules and utility rebates change. Verify the current IRS 25C limits and your utility's current rebate before you count on a specific number (figures and program rules were changing through 2026). The smart move is to enter your best estimate in the credit field so the calculator finances the net cost, then pay down the financed balance once the credit actually lands. That can shave real dollars off both the balance and the monthly payment.
This is where most homeowners get tripped up, especially during an emergency replacement when they are not in a mood to read fine print. HVAC financing usually comes in two flavors, and they are not the same:
To compare them honestly, run the manufacturer's promo APR and term in this tool, then run the standard installment APR and term, and look at total interest on each. A longer term lowers the monthly payment but raises the total you pay, so check both numbers, not just the one that fits this month's budget. And always confirm which type of plan you are being offered before you sign, because the word "promotional" hides both kinds.
In Florida and other Sun Belt markets, the AC runs most of the year, so cooling capacity and efficiency carry more weight than heating, and a slightly higher-SEER2 system can pay back faster than it would up north. Homes near salt water also face faster condenser corrosion, which is why some coastal homeowners finance coil-coated or corrosion-resistant equipment that costs a little more upfront. Local permit and licensing rules for HVAC changeouts vary by city and county, so treat any incentive, code requirement, or rebate as something to verify locally with your contractor and your utility before you finalize the financed amount.
Branded contractor financing widgets (Hearth and similar) typically run roughly 1,499 to 4,999 dollars per year, and the monthly-payment calculator is the core of that subscription. This one is free, instant, and embeddable, and it only ever uses the APR you or your customer enters, so nothing is invented. Every result is clearly labeled illustrative, never a loan offer or guaranteed rate, which keeps an HVAC company compliant while still letting homeowners see an affordable monthly number on the spot.
The Pro version embeds a branded HVAC financing tool on your site with real lender offers, live rates, and instant pre-qualification, so a homeowner facing a no-heat or no-cool emergency can get approved while they are still on the line. We build it into the high-converting HVAC website and local SEO that fills your schedule.
Get early access, book a free call →One formula does the work here: the standard amortizing loan payment. The monthly rate is your APR divided by 12, the term is the number of months you pick, and the payment is the financed amount spread across that term so the balance reaches zero at the end. At a true zero percent it divides the principal by the number of months. The principal is the installed price your contractor quoted, minus any tax credit or rebate, minus any cash down, floored at zero. You get the monthly payment, the total of all payments, and the total interest, with every subtraction shown as its own row.
There is no rate table anywhere in it. The APR and term come from you, and the system dropdown, furnace, condenser, full system, heat pump, mini-split or ductwork, changes only a written note about scope. No price is attached to any of those options. No lender sits behind the page, and there is no application, no credit check and no offer, which is why every result is labeled an estimate only, not a guaranteed rate. HVAC companies can copy the embed snippet and run the same calculator on their own site.
Read the limits before you rely on a figure. It cannot tell you what APR you will be approved for, and it cannot tell whether the promotion in front of you is a true installment plan or a deferred-interest plan that charges interest back to the purchase date if the balance is not cleared in time. Run both and compare total interest, not just the payment. It cannot confirm a tax credit or utility rebate either, so treat that field as your own estimate and verify the current IRS 25C limits and your utility's program. It does not size equipment, which comes from a load calculation done in the home.
The standard amortizing loan payment formula, with the monthly rate taken as your APR divided by 12. Enter zero percent and it divides the financed amount by the number of months instead. The financed amount is the installed price you typed, less any credit, rebate and cash down. No rate table sits behind it, so the output is only as accurate as the APR and term you supply.
Because an HVAC price turns on equipment tier, capacity, your home and your local labor market, and this tool can see none of that. It finances the quote you already hold. If you have not been quoted yet, collect bids first, then come back and run the payment against a real number rather than a guess.