How to pay for an HVAC system
An $11,000 replacement usually arrives on the day the system stops, and that timing is what makes the financing expensive. Incentives first, then a home equity line, then a credit union. The spread across that list is thousands.
National average
$11,000
per project
On this page
- Take the money that is free first
- What the borrowing costs
- The trap in "0% for 18 months"
- Getting the price down before you borrow
- Frequently asked questions
- Is contractor financing ever the right answer?
- Can I claim the tax credit if I finance it?
- What if I do not owe enough tax to use the credit?
- Should I use a HELOC for this?
- The contractor is offering a discount if I sign today.
An $11,000 HVAC replacement is one of the largest unplanned bills a household faces, and it usually arrives on the day the system stops. That timing is what makes the financing expensive: people take the first offer in the room.
The order that costs least, roughly, is incentives first, then a home equity line, then a credit union loan, then contractor financing, then a credit card. The difference between the top and the bottom of that list on an $11,000 job is several thousand dollars.
Take the money that is free first
The federal energy efficiency credit. Up to $2,000 for a qualifying heat pump, up to $600 each for a qualifying air conditioner or furnace, and up to $1,200 total per year across the non-heat-pump categories. The heat pump credit sits in its own $2,000 bucket, so a heat pump plus insulation in the same year can claim both. It is a credit against tax owed and it does not carry forward, so it is worth timing.
The residential clean energy credit covers 30% of a geothermal system with no dollar cap, and unused amounts do carry forward.
Utility rebates. Widely available and widely missed, typically $150 to $1,500, sometimes more for a heat pump. Many are paid to the contractor and applied to your invoice, which means you have to ask before the work rather than after.
State programmes. Several states run their own heat pump rebates on top of the federal credit, and the Inflation Reduction Act's home electrification rebates are rolling out state by state with income-based amounts up to $8,000 for a heat pump. Check your state energy office.
LIHEAP and weatherisation assistance cover emergency repairs and replacement for eligible low-income households. If money is genuinely tight, start here rather than with a loan.
What the borrowing costs
| Source | Typical rate | Notes |
|---|---|---|
| Home equity line of credit | 7% to 10% | Cheapest, secured on the house, takes 2 to 6 weeks |
| Credit union personal loan | 8% to 14% | Usually the best unsecured rate, fast |
| Bank personal loan | 10% to 18% | Depends heavily on credit score |
| Contractor promotional, 0% for 12 to 18 months | 0%, then 25%+ | Deferred interest, see below |
| Contractor standard financing | 9% to 20% | The dealer fee is in the price |
| FHA Title I home improvement loan | 6% to 12% | Government backed, for modest amounts |
| Credit card | 18% to 29% | Last resort |
On $11,000 over five years, the gap between 8% and 18% is about $3,400.
The trap in "0% for 18 months"
Most contractor promotional financing is deferred interest, not waived interest. Interest accrues from day one at the full rate, typically 25% to 30%, and is cancelled only if the entire balance is cleared before the promotional period ends.
Miss it by a month, or by a hundred dollars, and the whole accrued amount is added to the balance at once. On $11,000 over eighteen months at 27%, that is roughly $4,000 landing in a single statement.
It is a genuinely good deal if you can clear it, and you should know before signing whether you can. Divide the total by the number of promotional months, and if that payment does not fit comfortably in the budget, take a real loan instead.
Also ask what the dealer fee is. Contractors pay the finance company 3 to 8% for promotional offers, and it is in the quoted price whether you finance or not. Asking for a cash discount sometimes recovers it.
Getting the price down before you borrow
- Quote in the shoulder season. Spring and autumn are cheaper than the first heat wave or the first freeze, often by several hundred dollars.
- Get three quotes with model numbers on them, so you are comparing the same equipment.
- Ask what the mid-efficiency option costs. The jump from a 15 SEER2 to a 20 SEER2 system is thousands, and in a mild climate it does not pay back.
- Ask whether the ductwork genuinely needs replacing. It is the biggest single variable between quotes.
- Do the furnace and air conditioner together if both are old, saving $800 to $1,200 against two separate jobs.
Frequently asked questions
Is contractor financing ever the right answer?
Yes, when it is a true 0% offer you will clear inside the term, and when the price was competitive before financing came up. Agree the price first, then ask about payment.
Can I claim the tax credit if I finance it?
Yes. The credit is based on what the system cost, not on how you paid.
What if I do not owe enough tax to use the credit?
The energy efficiency home improvement credit is non-refundable and does not carry forward, so it is limited to your tax liability that year. The clean energy credit for geothermal does carry forward. State and utility rebates are usually paid regardless of tax position, which is one reason to chase them.
Should I use a HELOC for this?
It is usually the cheapest money, and it puts the house behind the debt. For a necessary replacement on a house you are staying in, that trade is generally reasonable. For an optional upgrade, less so.
The contractor is offering a discount if I sign today.
That is a sales technique, not a price. A quote that is only good for an hour is telling you something about the company.
Read next
Heat pump cost$5,000 to $13,000per projectA ducted heat pump costs $5,000 to $13,000 installed, typically near $8,000. The federal tax credit most guides still describe is, according to the IRS, no longer available.
Geothermal heat pump cost$18,000 to $45,000per projectA geothermal system costs $18,000 to $45,000 installed, or about $19,600 typical after the 30% federal credit. Between a third and a half of the bill is drilling or excavation rather than heating equipment.
HVAC cost by house size$6,500 to $20,000per projectA full changeout runs about $9,600 in a 1,100 square foot house and about $12,400 in a 2,800 square foot one. The house more than doubles; the bill goes up by less than a third, because most of what you pay for is the crew and the day.
Repair or replace your HVAC system$6,500 to $22,000per projectThe $5,000 rule says multiply the repair by the age of the system and replace above $5,000. It is memorable and it is wrong often enough to cost money. Here is the arithmetic that works, and the cases where it is not close.
HVAC replacement cost by state$6,500 to $22,000per projectThe same system costs $9,350 in Arkansas and $12,850 in Illinois. Equipment ships nationally and costs much the same everywhere; the two technicians who spend a day fitting it do not.