CostGuideHQ

AC Unit Replacement Cost: $3,884–$8,068 (Average $5,912) in 2026

Author: CostGuideHQ Editorial·✓ Fact-checked·Updated July 2026·8 min read·6 sources·US national averages, USD
Quick answerQuick answer: Replacing a central AC unit costs $3,884 to $8,068 on average (about $5,912) if your ductwork and electrical are already in place. A condenser-only swap can run as little as $1,300 to $6,100, while a full system plus new ductwork runs $9,000 to $16,000. Tonnage, SEER2 rating, and refrigerant compatibility drive most of the swing.
  • Replacing an existing central AC unit with usable ductwork already in place costs $3,884 to $8,068 for most homeowners, averaging around $5,912 (Angi, HomeAdvisor, Bob Vila, Forbes Home).
  • A condenser-only swap costs $1,300 to $6,100, averaging $2,900 — meaningfully less than a full system replacement (Angi).
  • Higher SEER2 efficiency ratings push installed cost up sharply, from $5,300–$7,900 for entry-level (13.4 SEER2) to $11,400–$17,300+ for the most efficient systems (HomeGuide).
  • If your old system runs on R-22 or R-410A refrigerant, you generally can't just swap the outdoor condenser — incompatible components force a full system replacement (HomeGuide).

How much does AC unit replacement cost?

National average
$5,912
total project
Typical range
$3,600–$14,000
Most projects
Whole project
$3,884–$8,068
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Cost by material / type

TypeLowHigh
Condenser (outdoor unit) only, matched to existing indoor coil$1,300$6,100
Full system replacement, existing ductwork reused$3,884$8,068
Full system replacement plus new or replaced ductwork$9,000$16,000
Estimate your cost
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Rough estimate only — get local quotes for exact pricing.

What affects the cost?

  • Tonnage/system size — installed cost rises with capacity: HomeAdvisor and Angi both price a 1.5-ton unit at $1,300-$4,000 and a 5-ton unit at $2,800-$6,800 (Angi, HomeAdvisor)
  • SEER2 efficiency rating — HomeGuide's installed pricing by SEER2 tier runs $5,300-$7,900 for entry-level (up to 13.4 SEER2) up to $11,400-$17,300+ for maximum efficiency (up to 25.8 SEER2); Forbes Home cites unit-only costs from about $2,700 for a 14-SEER unit up to $6,950 for 20-SEER (HomeGuide, Forbes Home)
  • Condenser-only swap vs. full system replacement — HomeGuide prices a central AC unit alone at $2,800-$7,500 ($5,300-$10,500 installed) versus $5,000-$10,000 unit / $9,000-$16,000 installed for a central AC plus ductwork; Angi's dedicated condenser-replacement guide puts a standalone condenser swap at $1,300-$6,100, average $2,900 (HomeGuide, Angi)
  • Ductwork condition — sealing and minor repairs run $300-$1,500 (HomeGuide) or $1,100-$2,700 for additional ductwork installation/repair (Bob Vila), while full ductwork replacement runs $1,400-$5,600+ (HomeGuide) or $1,000-$5,000, averaging $2,000 (HomeAdvisor, Forbes Home)
  • Refrigerant transition — a condenser-only swap isn't possible if the existing system runs on R-22 or older R-410A refrigerant, since new components aren't compatible; HomeGuide notes this forces a full system upgrade rather than a condenser-only swap, and Angi notes manufacturers may no longer produce or install new R-22 equipment, with R-22 production down 90% since 2015 (HomeGuide, Angi)
  • Repair-vs-replace age rule — HomeGuide puts the replace threshold at 10-12 years old or once repair costs reach roughly 50% of a new unit's price; Forbes Home and Bob Vila both frame it as multiplying the estimated repair cost by the unit's age, replacing once that figure exceeds the cost of a new unit, and note most central AC systems last 15-20 years (HomeGuide, Forbes Home, Bob Vila)
  • Labor rates — $75-$200 per hour or roughly $300-$1,600 total for a standard installation with existing ductwork (HomeAdvisor), or $640-$1,200 for an 8-hour job billed at $80-$150 per hour (Forbes Home)
  • Old unit removal and disposal — $25-$200 (Angi, HomeAdvisor) or about $225 on average (Forbes Home)
  • Electrical upgrades and permits — a new dedicated 240-volt circuit runs about $100-$150 (HomeAdvisor, Bob Vila), and replacement permits cost $100-$250 versus $250-$1,500 for a new install with ductwork (HomeGuide)

How much does it cost to replace an AC unit?

Replacing a central AC unit costs $3,884 to $8,068 for most homeowners, averaging around $5,912, when the home’s ductwork and electrical setup can be reused (Angi, HomeAdvisor, Bob Vila, Forbes Home). Angi is explicit about what that figure assumes: the $3,884 to $8,068 range covers most people replacing an existing unit, but only when the home’s ductwork and electrical setup are already in place and don’t need work (Angi). Bob Vila’s figures land close behind, at a $5,860 average and $3,882-$7,903 typical range, and Forbes Home reports a $5,900 average with a $3,600-$8,200 spread. If you only need to swap the outdoor condenser rather than the whole system, Angi’s dedicated condenser-replacement pricing runs much lower — $1,300 to $6,100, averaging $2,900. On the other end, a replacement that also needs new or replaced ductwork runs $9,000 to $16,000 (HomeGuide), closer to what you’d pay for central air installation from scratch.

What drives the price — tonnage, SEER2 rating, and ductwork condition?

Three factors do most of the work: how big a unit your home needs, how efficient it is, and whether your ducts can be reused as-is. Tonnage matters first — Angi and HomeAdvisor both price a 1.5-ton unit at $1,300 to $4,000 installed and a 5-ton unit at $2,800 to $6,800, with Forbes Home showing a similar $2,500-$4,500-to-$4,300-$6,800 spread. Efficiency, measured today as SEER2, moves the price even more: HomeGuide’s installed pricing runs $5,300 to $7,900 for entry-level equipment (up to 13.4 SEER2) but climbs to $11,400 to $17,300+ for the most efficient systems (up to 25.8 SEER2), and Forbes Home’s unit-only pricing shows the same pattern, from about $2,700 at 14 SEER to $6,950 at 20 SEER. Ductwork condition is the wildcard: sealing or minor repairs add $300 to $1,500 (HomeGuide) or $1,100 to $2,700 (Bob Vila), while a full duct replacement adds $1,400 to $5,600 or more (HomeGuide) — the difference between a $5,000 job and a $16,000 one.

When does a refrigerant transition force a full system swap instead of a condenser-only fix?

If your existing system runs on R-22 or older R-410A refrigerant, you usually can’t just replace the outdoor condenser — you’ll need a full system upgrade instead. HomeGuide is direct about this: if your old system runs on R-22 or R-410A refrigerant, swapping only the outdoor unit isn’t an option — refrigerant changes mean you need a full system upgrade instead. That’s because a new condenser’s refrigerant and coil specs generally aren’t compatible with an older indoor air handler, so mixing old and new parts risks poor performance or an outright mismatch. R-22 systems are further along in that squeeze: Angi notes that R-22 production has fallen 90% since 2015, and manufacturers may no longer produce or install new R-22 equipment at all, though replacement parts for existing R-22 systems can still be made. Before assuming a cheap condenser-only fix is on the table, have an HVAC contractor confirm your indoor coil and refrigerant type are compatible with the replacement condenser you’re considering — see our AC compressor replacement cost guide for compressor-specific pricing.

Should you repair your AC or replace it — and how do you lower the cost?

Replace once your unit is roughly 10 to 15 years old or a repair would cost about half of a new system. HomeGuide sets the threshold at 10 to 12 years old or repairs reaching 50% of replacement cost, and both Bob Vila and Forbes Home recommend multiplying the estimated repair cost by the unit’s age — once that number exceeds what a new unit would cost, replacement is the better deal. Most central AC systems last 15 to 20 years, so a 12-year-old unit needing a $1,500 repair is a much closer call than the same repair on a 3-year-old system. To keep the replacement itself affordable: reuse your existing ductwork and electrical circuit whenever the inspector clears them, ask specifically whether a condenser-only swap is possible before assuming you need a full system, and get quotes from several contractors, since labor alone runs $75 to $200 per hour (HomeAdvisor) and varies by season and company. If you’re weighing a smaller, ductless option instead of central air, our mini-split installation cost guide covers that alternative.

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Frequently asked questions

How much does it cost to replace a central AC unit?
Most homeowners pay $3,884 to $8,068, averaging around $5,912, to replace a central AC unit when the home's ductwork and electrical setup are already in place (Angi, HomeAdvisor, Bob Vila, Forbes Home). Add new or replaced ductwork and the total rises to $9,000 to $16,000 (HomeGuide).
Is it cheaper to replace just the outdoor condenser?
Yes — a condenser-only replacement costs $1,300 to $6,100, averaging $2,900, according to Angi's dedicated condenser-replacement pricing. That's well under the $3,884-$8,068 typical cost of replacing the full system, but it only works if the new condenser is compatible with your existing indoor coil and refrigerant type.
Can I just replace the outdoor AC unit and keep everything else?
Sometimes, but not always. HomeGuide notes that if your old system uses R-22 or R-410A refrigerant, you generally can't replace just the outdoor unit — the new condenser's refrigerant and coil requirements aren't compatible with older indoor components, so you'll need a full system upgrade instead.
How much does AC tonnage affect the price?
A lot. Angi and HomeAdvisor both price a 1.5-ton unit at $1,300 to $4,000 installed and a 5-ton unit at $2,800 to $6,800. Forbes Home shows a similar spread: $2,500 to $4,500 for 1.5 tons up to $4,300 to $6,800 for 5 tons.
What is SEER2 and how much does it add to the cost?
SEER2 is the current federal efficiency rating for air conditioners. HomeGuide's installed pricing climbs from $5,300 to $7,900 for entry-level equipment (up to 13.4 SEER2) to $11,400 to $17,300+ for the most efficient systems (up to 25.8 SEER2) — efficiency alone can roughly double or triple the installed price.
Does replacing an AC unit include new ductwork?
Not usually. Most of the headline replacement figures assume your existing ductwork is reused. Minor duct sealing or repairs run $300 to $1,500 (HomeGuide) or $1,100 to $2,700 (Bob Vila), while full ductwork replacement adds $1,400 to $5,600 or more (HomeGuide) — pushing a full project toward $9,000 to $16,000 (HomeGuide).
How do I know if I should repair or replace my AC unit?
HomeGuide recommends replacing once a unit is 10 to 12 years old or when a repair would cost at least 50% of a new system. Bob Vila and Forbes Home both suggest multiplying the estimated repair cost by the unit's age — if that number tops the cost of a new unit, replace it. Most central AC systems last 15 to 20 years.
How can I lower my AC unit replacement cost?
Reuse your existing ductwork and electrical circuit if they're in good shape, ask whether a condenser-only swap is possible, and get quotes from multiple contractors — labor alone runs $75 to $200 per hour (HomeAdvisor) and varies widely by company and season.

Sources

Figures synthesized and cross-checked across these sources (retrieved 2026-07-28):

  • Angi — AC replacement: normal range $3,884-$8,068, average $5,976, low end $1,400, high end $12,500. By type: Central AC unit cost $2,500-$4,500, installation cost $3,500-$7,000. By tonnage: 1.5 ton (18,000 BTU) $1,300-$4,000; 2 ton $1,500-$5,000; 3 ton $2,000-$5,500; 4 ton $2,600-$6,200; 5 ton $2,800-$6,800. HVAC pro labor $500-$2,500. New ductwork $3,000-$7,500 for 300 linear feet. Old AC removal $25-$200. AC repairs $450-$2,000+. AC units last 10 to 20 years. 'AC Unit Replacement vs. All-New HVAC System: Replacing an existing AC unit will cost anywhere from $3,884 to $8,068 for most people. This cost assumes you already have the required ductwork and electrical setup to simply replace the old unit.' R-22 production down 90% since 2015; manufacturers may no longer produce or install new AC units containing R-22, though replacement parts for existing R-22 units can still be made.
  • Angi (AC condenser replacement) — AC condenser replacement: normal range $2,500-$5,000, average $2,900, low end $1,300, high end $6,100. By tonnage (materials and labor): 1.5 ton $1,300-$2,200; 2 ton $1,350-$2,500; 2.5 ton $1,500-$2,800; 3 ton $1,850-$3,000; 3.5 ton $1,700-$3,500; 4 ton $1,980-$4,000; 4.5 ton $2,100-$4,500; 5 ton $2,150-$5,000. Compressor repair $800-$2,300; condenser coil repair $800-$3,000. Labor $300-$1,500. Permits $250-$400. '50% rule: If the repair cost exceeds 50% of the total cost of replacing the unit, replace it.'
  • HomeAdvisor — Average cost to install an AC unit is $5,976, most homeowners spend $3,884-$8,068. By tonnage: 1.5 ton $1,300-$4,000; 2 ton $1,500-$5,000; 3 ton $2,000-$5,500; 4 ton $2,600-$6,200; 5 ton $2,800-$6,800. AC unit cost by type: Central AC $2,900-$9,000. Labor $75-$200/hour, 4-8 hours ($300-$1,600). New ductwork $1,000-$5,000, average $2,000; duct repairs $200-$1,000. Electrical panel upgrade labor $100-$150/hour; drain-line plumbing $100-$150/hour. Old system removal/disposal $25-$200. Most central air-conditioner systems last 15-20 years; replacement is more efficient once a unit is 15 years or older. SEER regulation: northern U.S. minimum 14 SEER, southern states minimum 15 SEER.
  • Bob Vila — Central AC unit cost ranges $3,882-$7,903, national average $5,860 (citing Angi and HomeAdvisor). Per sq ft $2.90-$7.20. By SEER rating (unit only): 14 SEER $1,725-$3,600; 15 SEER $2,300-$4,800; 16 SEER $2,875-$6,000; 17 SEER $3,450-$6,600; 18 SEER $4,100-$7,800; 19 SEER $4,600-$8,400; 20 SEER $5,750-$9,600; 21 SEER $6,325-$10,800. Labor without ductwork updates $1,250-$3,000; complete ductwork and unit installation labor average $2,215-$5,325. Ductwork installation or repair $1,100-$2,700. Electrical work $100-$150. Old HVAC system removal/disposal $25-$200. Central air-conditioner systems have a lifespan of 15 to 25 years; if the home's AC unit is more than 10 to 15 years old, replacement should be considered. Repair-vs-replace: 'Homeowners can multiply the total cost of repairs by the age of the system... If the amount is more than $5,000, the homeowner will want to start looking into HVAC unit replacement costs.'
  • HomeGuide — AC replacement (2,000 sq ft home basis): entry-level/standard efficiency $5,000-$8,300 installed; mid-range $8,300-$12,500 installed; high-end $12,500-$14,000+ installed. By tons installed: 1.5 tons $4,700-$6,500; 2 tons $5,000-$6,800; 2.5 tons $5,400-$7,200; 3 tons $5,800-$7,800; 3.5 tons $6,200-$8,300; 4 tons $6,500-$8,800; 5 tons $7,000-$9,500+. By SEER2 rating installed: 13-14 SEER (up to 13.4 SEER2) $5,300-$7,900; 15-16 SEER (14.0-14.7 SEER2) $6,700-$9,300; 17-18 SEER (15.0-17.2 SEER2) $7,500-$10,600; 19-21 SEER (16.5-18.5 SEER2) $9,100-$12,200; 22-26 SEER (up to 25.8 SEER2) $11,400-$17,300+. By type: Central air conditioner unit $2,800-$7,500, installed $5,300-$10,500; central air conditioner and ductwork unit $5,000-$10,000, installed $9,000-$16,000. Ductwork sealing/repairs $300-$1,500; ductwork replacement $1,400-$5,600+. Permits for AC replacement $100-$250; permits for new AC installations with ductwork $250-$1,500. AC repair costs $150-$650. Replace when: system is more than 10-12 years old, repairs cost at least 50% of a new AC, or the system still uses R-22 or R-410A refrigerants. New AC systems last 15-20 years on average. 'Can I replace just the outdoor unit? ... If your old system uses R-22 or R-410A refrigerant, you can't replace just the outdoor unit—you'll need a full system upgrade due to refrigerant changes.'
  • Forbes Home — Central AC unit average cost $5,900; highest $8,200; lowest $3,600. By unit size: 1.5 ton (18,000 BTU) $2,500-$4,500; 2 ton $3,100-$5,100; 3 ton $3,400-$5,400; 4 ton $4,200-$6,200; 5 ton $4,300-$6,800. By SEER rating, average cost per unit: 14 SEER $2,700; 15 SEER $3,500; 16 SEER $4,100; 17 SEER $4,900; 18 SEER $5,500; 19 SEER $6,200; 20 SEER $6,950. Labor $80-$150/hour, about 8 hours assuming ductwork already in place ($640-$1,200). Ductwork installation averages $2,000 ($1,000-$5,000). Old system removal (junk removal) averages $225. New single-family home installation averages $5,850; old home without ductwork averages $7,850. Replace the unit once it is nearing 15 years old (typical lifespan 15-20 years) or when repair costs approach replacement cost.

Five sources publish a directly comparable 'replace an existing central AC, ductwork already in place' figure, and four of them cluster tightly: Angi and HomeAdvisor share the same underlying dataset (national average $5,976, normal range $3,884-$8,068, full span $1,400-$12,500), Bob Vila reports national average $5,860 (typical range $3,882-$7,903, citing Angi/HomeAdvisor), and Forbes Home reports average $5,900 (range $3,600-$8,200). HomeGuide reports a similar entry-level band ($5,000-$8,300 for a 2,000-sq-ft home) but explicitly tiers upward by efficiency — mid-range $8,300-$12,500 and high-efficiency $12,500-$14,000+ — which reflects higher-SEER2 equipment rather than a different base price. national_average_usd ($5,912) is the mean of the three independently reported averages (Angi/HomeAdvisor $5,976, Bob Vila $5,860, Forbes Home $5,900); HomeGuide's tiered ranges aren't a single average so they're excluded from that mean but inform the top of the published range. range_low_usd ($3,600) is Forbes Home's low end, matching the low end of the Angi/HomeAdvisor/Bob Vila cluster ($3,882-$3,884) closely enough to represent the tightest realistic 'existing ductwork' job. range_high_usd ($14,000) reflects HomeGuide's high-efficiency ceiling, capturing higher-SEER2 full-system jobs that the tighter Angi/HomeAdvisor/Bob Vila/Forbes Home range doesn't reach. project_low_usd/project_high_usd ($3,884-$8,068) is the Angi/HomeAdvisor 'normal range,' which Angi explicitly frames as the cost 'to replace an existing AC unit... assuming you already have the required ductwork and electrical setup' — the most directly on-topic figure for a like-for-like replacement. by_type splits the job by scope: a condenser-only swap (Angi's dedicated condenser guide, $1,300-$6,100) is meaningfully cheaper than a full system replacement with existing ductwork ($3,884-$8,068, Angi/HomeAdvisor), which is in turn cheaper than a full replacement that also requires new or replacement ductwork ($9,000-$16,000, HomeGuide). A condenser-only swap only works if the new unit is refrigerant- and coil-compatible with the existing indoor components; HomeGuide and Angi both flag that older R-22 or R-410A systems generally can't be matched to new components and need a full system swap instead. Figures generally include the unit and standard installation labor; old-unit removal, ductwork repair or replacement, electrical upgrades, and permits are commonly quoted as separate line items.