HVAC System Cost Calculator
Work out what a full heating and cooling replacement should cost before you call anyone. This HVAC system cost calculator prices the job from the four things that actually move the number: what you are replacing, how much capacity your home needs, the efficiency tier you pick, and the state of your ductwork. It separates equipment from labour so you can see which half of a quote is being marked up.
| Home size | Capacity | Estimated installed cost |
|---|
01 How much does a new HVAC system cost in 2026?
Two sources that publish their own figures put the national picture like this. Angi states that "an HVAC replacement cost is $7,500 on average" with a range that "could be as low as $5,000 or as high as $12,500." Modernize publishes a national range of "$6,224 to $11,434" and an average of "$8,829" for a 2,000 to 2,500 square foot home. Those two independent numbers agree closely, which is more reassuring than any single figure would be.
The calculator above is built to land in that same territory for a typical job. A 2,000 to 2,500 square foot home getting a mid range AC and gas furnace at standard efficiency, reusing good ducts, at national labour rates, comes out at roughly $7,100 to $9,800. That straddles both published averages.
Where a real quote leaves that territory, it is almost always because of one of four things: the home needs more capacity than average, the ductwork is not reusable, the homeowner chose a high efficiency variable speed system, or the job is in a high labour cost metro. Each of those is a separate input above, which is the point of asking rather than quoting one average.
02 How this HVAC system cost calculator works
The estimate is built from the ground up rather than adjusted from a single national average. Four components are priced separately and then added:
- Equipment. A base cost is chosen from your system type and the capacity your square footage implies. That base is then multiplied by your efficiency tier and your equipment tier. Both uplifts apply to equipment only, never to labour.
- Labour. Priced from system type and capacity, then adjusted by region at full weight.
- Ductwork. A flat range for the condition you selected, adjusted by region. Nothing is added for a ductless mini split.
- Additional work. Each ticked item adds its own low figure to your low end and its own high figure to your high end.
Equipment is adjusted by region at half weight because equipment moves through national distribution at broadly national prices, while an installer's hourly rate is entirely local. Treating both the same way, as the previous version of this page did, overstates regional variation.
The reference table in the results is generated by the same engine as the headline figure, using your own system type, tier and region. It cannot disagree with the number above it.
03 HVAC replacement cost by system type
System type is the largest single lever on a new HVAC system cost, ahead of brand, ahead of efficiency, and ahead of region. Replacing one appliance costs roughly half what replacing the pair costs, because you pay the installation crew once either way.
Figures below are for a 2,000 to 2,500 square foot home, mid range equipment, standard efficiency, good existing ductwork, national labour rates. Change any of those and the numbers move, which is what the calculator is for.
| System type | Typical installed cost | Suits |
|---|---|---|
| AC and gas furnace | $7,100 to $9,800 | Cold winters with gas at the property |
| Heat pump | $7,900 to $10,900 | Mild to moderate winters, or no gas supply |
| Central AC only | $4,500 to $6,200 | Furnace still has years left in it |
| Gas furnace only | $3,700 to $5,100 | Air conditioner still has years left in it |
| Ductless mini split, 3 zones | $5,800 to $8,000 | No ducts, additions, or room by room control |
The two single-appliance rows are worth a second look. If only one half of your system has failed, replacing just that half is usually the right call. Contractors will often quote the pair because it is a larger job, and because a matched pair is genuinely more efficient. Both things are true. Ask for the single-appliance price as a separate written quote and decide with both in front of you.
04 What size HVAC system do I need?
Capacity is measured in tons for cooling and BTU per hour for heating. As a rough starting point, a home needs somewhere around 20 to 30 BTU of cooling per square foot depending on climate, insulation and window area, which works out at roughly one ton per 500 to 700 square feet.
| Home size | Cooling | Heating |
|---|---|---|
| Under 1,000 sq ft | 1.5 ton | 40,000 BTU |
| 1,000 to 1,500 sq ft | 2 ton | 60,000 BTU |
| 1,500 to 2,000 sq ft | 2.5 ton | 80,000 BTU |
| 2,000 to 2,500 sq ft | 3 ton | 100,000 BTU |
| 2,500 to 3,000 sq ft | 4 ton | 120,000 BTU |
| 3,000 sq ft and up | 5 ton | 140,000 BTU |
Treat that table as a sanity check on a contractor's proposal, not as a spec. The correct method is a Manual J load calculation, which accounts for insulation levels, window type and orientation, ceiling height, air leakage and local design temperatures. Two identical floor plans can need different equipment.
Oversizing is the more common error and the more expensive one. An oversized air conditioner satisfies the thermostat quickly, shuts off, and never runs long enough to pull humidity out of the air, so the house feels clammy at the right temperature. The short cycling also wears the compressor. If a contractor proposes a larger system than the table suggests without showing you a load calculation that explains why, ask for the calculation.
05 SEER2 and AFUE: what efficiency actually costs
SEER2 rates cooling efficiency and AFUE rates the percentage of fuel a furnace turns into heat. Higher on either scale means a lower running cost and a higher purchase price, and whether that trade is worth it depends entirely on your climate and your energy prices.
Federal minimums are regional. Per AHRI, split system central air conditioners under 45,000 BTU must meet "13.4 SEER2" in the North and "14.3 SEER2" in the Southeast and Southwest. Anything sold new meets at least that, so the standard tier in this calculator is not a compromise, it is the floor set by law.
The arithmetic on an upgrade is simple enough to do yourself, and worth doing before a salesperson does it for you. Take your annual cooling or heating spend, work out the proportional saving the higher rating implies, and divide the extra equipment cost by that yearly saving. Going from 14 to 20 SEER2 cuts cooling energy use by roughly thirty percent, so on a $900 annual cooling bill you would save around $270 a year. Against a $2,600 upgrade that is a payback just under ten years, which is most of the equipment's service life.
The same sum in a mild climate with a $300 cooling bill gives a saving of $90 a year and a payback beyond the life of the machine. This is why national advice about high efficiency systems is close to useless. Run it on your own bill.
06 What drives HVAC installation cost the most
Replacing both appliances rather than one roughly doubles the equipment cost while the labour rises far less, because the crew, the crane time and the permit are shared.
Each step up the size ladder adds several hundred dollars of equipment and a few hundred of labour. Over the full range from 1.5 to 5 tons, capacity alone roughly doubles the installed cost.
The single biggest surprise line. Reusing sound ducts costs nothing. A full re-duct adds $2,100 to $5,600, and ducting a home that has never had any adds $3,000 to $8,000.
Moving to a high efficiency variable speed system adds around 62% to the equipment cost. Worth it in a demanding climate, rarely worth it in a mild one.
Premium lines run about 54% above entry level equipment. Much of that buys a longer parts warranty and a quieter outdoor unit rather than lower running costs.
An identical job costs meaningfully more on the West Coast and in the Northeast than in the Southeast, and the difference is almost entirely the hourly rate rather than the hardware.
07 Ductwork, the line item that moves the total most
Ductwork deserves its own section because it is where quotes diverge most and where homeowners have the least ability to judge what they are being told.
If your existing ducts are sound, correctly sized for the new equipment and reasonably sealed, they can be reused and the line is zero. Most like for like replacements fall here. Problems arise when the new system has different airflow requirements than the old one, when ducts run through an unconditioned attic and leak badly, or when previous work left undersized runs feeding distant rooms.
Because you cannot see most of your own ductwork, this is the easiest line on a quote to inflate. Two defences work. First, ask the contractor to show you the problem, with a photo or in person. Second, if a full replacement is proposed, get a separate duct-only quote from a different company. A second opinion on a $5,000 line item costs you one appointment.
Duct sealing is worth asking about even when replacement is not warranted. It is a fraction of the cost of new ducts and, in a house with leaky attic runs, often recovers more comfort per dollar than a higher SEER2 rating would.
08 Tax credits and rebates in 2026
This changed, and the change is recent. The federal Energy Efficient Home Improvement Credit, section 25C, is the one that gave up to $2,000 for a qualifying heat pump and up to $600 for other qualifying equipment. The IRS states that "the credit will not be allowed for any property placed in service after December 31, 2025." An installation done today does not qualify. The credit was originally scheduled to run to 2032 under the Inflation Reduction Act, and a great deal of advice still online reflects that older schedule.
Note the wording carefully. The cutoff is when the property was placed in service, not when you paid for it. If your system was installed and commissioned in 2025 you may still have a claim for that tax year even if you are only now getting to the paperwork. Ask a tax professional about your specific dates rather than relying on this page.
State, local and utility incentives are a completely separate matter and many of them are still running. They vary enormously by area, they change on their own schedules, and some are first come first served within an annual budget. Check your own electricity and gas utility's website and your state energy office directly. Do not budget around any incentive you have not confirmed on the provider's own site, and be wary of a contractor who quotes you a net price after a credit without showing you the programme it comes from.
09 HVAC system cost FAQ
Angi puts the national average at $7,500 with a typical range of $5,000 to $12,500. Modernize publishes $6,224 to $11,434 nationally and $8,829 for a 2,000 to 2,500 square foot home. A full AC and gas furnace replacement in an average home with reusable ductwork generally lands between $7,000 and $10,000, with the total rising sharply if ductwork needs replacing or a high efficiency system is chosen.
Per appliance, yes. The crew, the permit and the disposal are paid once rather than twice, so doing both together costs less than two separate jobs a few years apart. The catch is that the combined bill is still much larger today. If only one appliance has failed and the other has real life left, replacing one is usually the better financial decision even though the per-unit cost is higher.
Very roughly one ton of cooling per 500 to 700 square feet, so around 3 tons and 100,000 BTU for a 2,000 to 2,500 square foot home. That is a sanity check, not a specification. The correct method is a Manual J load calculation covering insulation, windows, ceiling height, air leakage and local design temperatures. Oversizing causes short cycling and a humid house, so ask to see the calculation if a contractor proposes more capacity than the rule of thumb suggests.
Not federally. The IRS states that the section 25C Energy Efficient Home Improvement Credit will not be allowed for any property placed in service after December 31, 2025, so a system installed today does not qualify. The cutoff is based on when the equipment was placed in service rather than when it was paid for. State, local and utility rebate programmes are separate and many still run, so check your own utility and state energy office directly.
Upfront, usually slightly more: around $7,900 to $10,900 against $7,100 to $9,800 for a comparable AC and gas furnace pair in an average home. The comparison that matters is running cost, and that turns on your local electricity price against your local gas price, plus how cold your winters get. Where gas is cheap and winters are severe, a furnace usually wins on running cost. Where electricity is reasonable and winters are mild, a heat pump usually wins, and it replaces two appliances with one.
Because it is fabrication and installation labour in awkward spaces rather than an off the shelf part. A full re-duct adds $2,100 to $5,600 and ducting a home that has never had any adds $3,000 to $8,000. It is also the line homeowners can least easily verify, since most of it is hidden. Ask to be shown the problem and get a separate duct-only quote from another company before agreeing to a full replacement.
Spring and autumn. Contractors have more availability outside the cooling and heating peaks, and more importantly you have time to gather three quotes and compare them. A system that fails in a July heatwave leaves you accepting whoever can come tomorrow at whatever they charge. If your system is old but still working, planning the replacement is worth real money.
Three, each itemised. Ask every contractor to list model numbers, capacity in tons or BTU, the SEER2 and AFUE ratings, labour, permits, disposal and any ductwork as separate lines. Identical model numbers across three quotes turn a vague comparison into a straight price comparison, and separated lines show you whether a high total is equipment, labour or ductwork.
10 Limits, sources and disclaimer
What this calculator cannot see
How accessible your equipment location is, whether the flue or line set can be reused, your local permit costs, what your specific contractors charge this month, refrigerant line length, electrical service capacity, and anything that turns up once the old unit is out. Any of these can push a real quote outside the range shown here.
About the figures
The two national figures quoted in section 01 are taken from Angi's HVAC replacement cost guide and Modernize's HVAC cost calculator, both read directly. The efficiency minimums in section 05 come from AHRI's residential central air conditioner standards. The tax position in section 08 comes from the IRS FAQ on the modification of section 25C.
The component level price ranges inside the calculator are typical installed costs for a straightforward replacement and are calibrated so that a typical job lands between the two published national averages above. They have not been verified line by line against a named pricing source, which is why the results table carries a blank verification line. An earlier version of this page displayed a "2026 verified pricing" badge, claimed to be based on "56,000+ real homeowner projects", and attributed a national average of "$11,590 to $14,100" to Modernize. Modernize publishes $6,224 to $11,434, no project count appears on the cited page, and the badge was not backed by anything. All three have been removed, in line with the rule on the Editorial Policy that a source is only named if it was actually read.
Not professional advice
This page is informational. It is not a quote, not an offer, and not a substitute for a licensed HVAC contractor assessing your home. The work involves refrigerant, gas and mains electricity and is not a do it yourself job. Always use a licensed, insured installer and pull the required permits. Nothing here is tax advice.
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