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HVAC Financing Payment Calculator (Good / Better / Best)

Plenty of homeowners compare system options by the monthly payment, not the total price. Put in your Good, Better, and Best prices and a loan's terms to see the estimated payment, total paid, and interest on each — and how much of each sale you actually keep once the lender takes its dealer fee.

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Example numbers — replace with yours. The starting values are placeholders so the form isn't empty. They are not industry averages, typical prices, or real loan offers.

Your three options

The loan

Results

Good

Amount financed —
Monthly payment —
Total paid (down + all payments) —
Total interest —
Dealer fee (paid by you) —
You keep after dealer fee —

Better

Amount financed —
Monthly payment —
Total paid (down + all payments) —
Total interest —
Dealer fee (paid by you) —
You keep after dealer fee —

Best

Amount financed —
Monthly payment —
Total paid (down + all payments) —
Total interest —
Dealer fee (paid by you) —
You keep after dealer fee —

These are estimates for planning. Before you show a homeowner a payment, use the lender's own quote, calculator, and required disclosures — their numbers, approval, and rate are what count.

The math

—

How it works

  • Amount financed = system price − down payment.
  • Monthly rate (r) = APR ÷ 12. A 9.99% APR is 0.8325% per month.
  • Monthly payment = amount financed × r ÷ (1 − (1 + r)−months). This is the standard formula for a fixed-rate loan paid in equal monthly payments.
  • At 0% APR there is no interest, so the payment is just amount financed ÷ months.
  • Total paid = down payment + monthly payment × months. Total interest = all monthly payments − amount financed.
  • Dealer fee = amount financed × dealer fee %. You keep = system price − dealer fee (before your own job costs).

Worked example

The Better option with the example numbers above: $11,000 price − $1,000 down = $10,000 financed. At 9.99% APR for 120 months, r = 0.0999 ÷ 12 = 0.008325, and the payment is $10,000 × 0.008325 ÷ (1 − 1.008325−120) = $132.10 a month. Over 120 months that's $15,851.44 in payments, so the homeowner pays $16,851.44 in total and $5,851.44 in interest. With a 5% dealer fee on the $10,000 financed, the lender keeps $500 and you keep $10,500 of the $11,000 sale.

Same $10,000 on a 0% plan for 60 months: $10,000 ÷ 60 = $166.67 a month and no interest. No-interest and low-rate plans often carry a bigger dealer fee for the contractor, so run the same job through each plan you offer and compare what you keep.

Why the dealer fee matters

The homeowner never sees the dealer fee — it comes out of the money the lender sends you. On a job priced for a set margin, that fee comes straight off your profit. Put the job through the HVAC job profit calculator with the dealer fee added to other direct costs to see what the job really made. Some lender agreements limit whether you can charge financed customers more than cash customers, so read yours before you build the fee into a price.

Things this leaves out

  • Promotional plans. Deferred-interest and "same as cash" plans can charge back interest if the balance isn't paid in time. This calculator assumes a simple fixed-rate loan.
  • Lender rounding and fees to the homeowner. Origination or late fees and the lender's rounding can change the real payment by a little.
  • Sales tax, rebates, and credits. Enter the amount actually being financed, after anything that lowers or raises it.
  • Approval. The rate a homeowner gets depends on the lender's approval. Never promise a rate or a payment.

We don't quote typical APRs, terms, or dealer fees here because they change often and differ by lender and plan. Use the numbers from your own lender's current rate sheet.

For how to build and present the three options themselves, read the guide HVAC good-better-best pricing.

Related tools

Setting the three prices in the first place? The HVAC flat-rate price calculator turns equipment and labor into a price that hits your target margin. To see what one install actually made after overhead, commission, and the dealer fee, use the HVAC job profit calculator.

Ready to show the customer? The HVAC good / better / best proposal builder puts your three options, prices, and payment estimates on one printable page.

Comparing a higher-efficiency option? The HVAC SEER2 energy savings calculator estimates the yearly cooling savings, so the homeowner can set them next to the monthly payment.