HVAC Replacement Cost Calculator — Free Online Calculator
This HVAC replacement cost calculator estimates what a new HVAC system costs to install — a central AC, gas furnace, heat pump, mini-split, or full system — adjusted for system size, efficiency tier, ductwork condition, and your local labor market. Use it to set a realistic budget before you collect quotes, or to sanity-check the system replacement quotes you already have.
Not sure what size you need yet? Get the load from the BTU Calculator, convert it with the Tonnage Calculator, then come back here to price it.
Describe the replacement job
Estimated installed cost
Typical mid-point
$10,500
Per ton of capacity
$3,500
See the breakdown
National 2026 ballparks for budgeting — equipment, labor, permit, and disposal included. Your local line-item quotes are the real number; use this to sanity-check them.
Typical HVAC replacement costs (quick reference)
National installed-price ranges for standard-efficiency equipment, existing ductwork in good shape. High-efficiency tiers add roughly 15–30%.
| Replacement job | Low | Typical | High |
|---|---|---|---|
| Central AC only | $4,000 | $5,500 | $8,000 |
| Gas furnace only | $3,500 | $5,000 | $7,500 |
| Full system (AC + furnace) | $8,000 | $10,500 | $15,000 |
| Heat pump | $6,000 | $9,000 | $12,500 |
| Mini-split (single zone) | $3,000 | $4,000 | $5,500 |
| Ductwork replacement (add-on) | +$2,500 | +$4,000 | +$6,000 |
Ranges reflect typical 2026 national pricing for residential jobs and vary by brand, region, and site conditions. Always compare multiple line-item quotes.
The formula, explained in plain English
Replacement pricing isn't mysterious — it's a base price for the type of job, scaled by the four things that genuinely change the work: size, efficiency, ductwork, and local labor rates.
Why size moves the price less than you'd think
Going from 3 to 5 tons raises equipment cost, but the labor — the biggest line — stays similar. That's why the size factor spans only 0.85–1.25.
Why efficiency adds 12–25%
Higher SEER2 and condensing AFUE equipment costs more to build (two-stage compressors, secondary heat exchangers) — but earns it back in bills over time.
Ductwork is the wildcard
Good existing ducts add nothing. Full replacement adds thousands of dollars of attic and crawl-space labor — it's the single biggest surprise in real quotes.
Why a ±15% range?
Brand tier, warranty, access difficulty, and code extras (pads, disconnects, line sets) genuinely vary between jobs. A range is honest; a single number isn't.
Worked examples
Three common replacement scenarios, priced step by step.
The typical job — full system, 3 tons, standard efficiency
AC + furnace · existing ducts in good shape · national-average labor.
× 1.0 market = $10,500
range = $8,900 – $12,100
Result: budget around $10,500 — the most common single number in American HVAC replacement, which is why quotes clustering near it are a good sign.
AC swap in an expensive city — 2 tons, high-efficiency, small duct fixes
Central AC only · high-efficiency tier · minor duct repairs · high-cost metro (×1.2).
+ $1,000 ducts = $7,188 → × 1.2 market = $8,625
range = $7,300 – $9,900 (mid ≈ $8,600)
Result: a small unit still lands near $8,600 once you add the efficiency premium and big-city labor — size isn't the main cost driver, the market is.
The big job — 4-ton heat pump with all-new ductwork
Heat pump · mid-tier efficiency · full duct replacement · low-cost area (×0.9).
+ $4,000 ducts = $15,592 → × 0.9 market = $14,033
range = $11,900 – $16,100 (mid ≈ $14,000)
Result: about $14,000 — and notice the ductwork alone is the difference between this and a ~$10,000 job. Before committing, check federal heat-pump tax credits and utility rebates, which can claw back thousands.
Frequently asked questions
Common questions about HVAC replacement pricing.
How much does it cost to replace a full HVAC system?
A full system replacement — central AC plus gas furnace — typically runs $8,000 to $15,000 installed, with about $10,500 as a national mid-point for a 3-ton, standard-efficiency setup. Size, efficiency tier, ductwork condition, and local labor rates move the number up or down.
How much does it cost to replace just the AC unit?
Replacing the central air conditioner — condenser and evaporator coil — typically costs $4,000 to $8,000 installed, around $5,500 for a 3-ton standard-efficiency unit. The indoor coil must match the new condenser, which is why an AC swap costs more than the outdoor unit alone.
Why does replacing ductwork add so much to the price?
Full duct replacement typically adds $2,500 to $6,000 because it's labor-intensive work in attics and crawl spaces: tearing out old runs, sizing and sealing new ones, and balancing airflow. Minor sealing and repairs are far cheaper — usually $500 to $2,000.
Is a heat pump cheaper than an AC plus furnace?
Often, yes. One heat pump handles both heating and cooling — typically $6,000 to $12,000 installed versus $8,000 to $15,000 for an AC-plus-furnace combination. Federal tax credits and utility rebates can widen the gap further, though very cold climates may still favor a furnace or dual-fuel setup.
What should be included in an HVAC replacement quote?
A complete quote covers equipment, labor, refrigerant lines, electrical hookup, permits, haul-away of the old unit, and startup testing. Watch for exclusions like electrical-panel upgrades, duct modifications, or thermostat replacement — line-item quotes make those gaps easy to spot.
Is high-efficiency equipment worth the extra cost?
High-efficiency models typically cost 15–30% more up front and pay it back through lower bills — fastest in climates with long cooling or heating seasons. Run your exact numbers with the SEER Savings Calculator before deciding.
Why do HVAC quotes vary so much between contractors?
Brand tier, equipment efficiency, warranty length, company overhead, and what's actually in scope all differ. A quote $3,000 below the others often excludes ductwork, permits, or disposal. Always compare line-item quotes so you're comparing the same job — not just the bottom line.
Contractors: turn ballparks into line-item quotes.
This page gives homeowners a budget — TradesQuote gives you the winning quote. Describe the replacement or upload photos, and our AI builds the full line-item estimate: equipment, labor, materials, permits, and disposal, with quantities and unit prices validated by a built-in quality control agent.
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