Central AC Replacement Cost
Replacing central AC costs $4,500–$7,000 for a small home and $7,000–$11,500 for a typical 2,000 sq ft house — before efficiency upgrades. Price your size and SEER tier, and see when repair beats replacement.
Two things set an AC replacement bill: how much house you're cooling — that decides the system's tonnage — and how efficient a unit you buy, measured in SEER. Size is non-negotiable (an undersized unit runs itself to death); efficiency is the choice, and it's a climate bet: the hotter your summers, the faster high SEER pays for itself.
How big is your home?
The square footage your AC actually cools — skip unfinished basements and garages. Size determines the system's tonnage, and tonnage drives the price.
How efficient a system?
SEER measures cooling efficiency — higher numbers use less electricity for the same cold air. Federal minimums are 14 SEER in northern and southwestern states, 15 in the southeast. The high tiers cost real money up front and earn it back fastest in hot climates with long cooling seasons.
Cost to replace the AC in a 2,000 sq ft home
$7,000–$11,500
unit and installation — ductwork repairs or modifications are a separate bill
Repair or replace? The three-question test
AC repairs run $150–$650, so a young system with one problem gets fixed, not replaced. Replace when the answers stack: is it 10–12+ years old? Is the repair quote half the cost of new? Does it still run R-22 or R-410A refrigerant? Old refrigerants are being phased out and get pricier to top off every year — a leak in an R-22 system is usually the system's retirement letter.
The two things your quote must spell out
First, the load calculation — square footage is a starting point (16–30 BTUs per sq ft), but a proper bid sizes by insulation, windows, and climate, and can move your tonnage a half-ton either way. Second, ductwork: every range on this page excludes duct repairs or modifications, and old ducts often need work when a new system arrives — make every bidder price it as its own line.
Installed prices for the unit and standard replacement labor. Federal SEER minimums: 14 in northern and southwestern states, 15 in the southeast. Homes over 3,000 sq ft need 5+ ton or multiple systems and can exceed the range; replacement takes anywhere from 4 hours to 3 days. Excludes ductwork modifications, and the top efficiency tier's ceiling is open-ended.
💡About this calculator▼
Central air conditioners die on a schedule — 10 to 15 years of summers, then the repair calls start — and the replacement decision usually arrives mid-heat-wave, which is the worst possible time to learn the pricing landscape. Here it is in advance, in the two dimensions that matter: how much house you're cooling, and how efficient a system you buy.
Size comes first because it isn't a choice. Air conditioners are sized in tons of cooling capacity, tonnage follows your square footage, and both undersizing and oversizing are expensive mistakes — an undersized unit runs constantly and dies young; an oversized one short-cycles and never dehumidifies. A 1,000 sq ft home needs 1.5–2 tons at $4,500–$7,000 installed; a typical 2,000 sq ft home needs 3.5–4.5 tons at $7,000–$11,500; big homes past 3,000 sq ft need 5+ tons at $10,000–$16,000 and up.
Efficiency is the real decision. SEER ratings run from the federal minimum (14 in northern and southwestern states, 15 in the southeast) to 26 at the maximum-efficiency end. Each step up costs more installed — about $1,400 more for 15–16 SEER over baseline, and $6,100–$9,400 more for the 22–26 SEER variable-speed tier. Whether the premium pays back is a climate bet: in Phoenix, high SEER earns its keep; in Minneapolis, the cooling season is too short to amortize it.
Enter your square footage, pick an efficiency tier, and you'll have the range to hold against bids — plus the repair-or-replace test to run before spending anything at all.
Square footage sets the tonnage and the base price; the SEER tier adds its premium on top.
The size axis. Published installed pricing runs in nine steps from 1,000 sq ft (1.5–2 tons, $4,500–$7,000) through 2,000 sq ft (3.5–4.5 tons, $7,000–$11,500) to 3,000 sq ft (5+ tons, $10,000–$16,000+), and this calculator interpolates between the steps for in-between homes. Below 1,000 sq ft the price stops falling — the smallest real system is still the bill — and above 3,000 sq ft the top of the range is honestly open-ended, because very large homes often need multiple systems.
The efficiency axis. The SEER table prices five tiers, and the calculator applies each tier's premium over the 13–14 SEER baseline: +$1,400 for 15–16 SEER, +$2,200–$2,700 for 17–18, +$3,800–$4,300 for 19–21, and +$6,100–$9,400 for the 22–26 maximum tier. One distinction worth keeping straight: compressor staging (single-stage, two-stage, variable-speed) is a comfort feature that spans SEER tiers rather than mapping onto them — two-stage units are common anywhere from 15 SEER up. The exception is the very top: reaching 22+ SEER essentially requires a variable-speed compressor, which is why maximum efficiency and maximum comfort arrive together in that tier.
What's excluded, deliberately. Ductwork. Every published figure — and therefore every figure here — excludes duct modifications or replacement, and aging ducts often need attention exactly when the system does. It's the single most common reason a real bid exceeds this range, which is why the results say it out loud.
📐How it's calculated▼
Total = size-based system cost + efficiency premium.
Size-based cost (installed, standard efficiency): a 1,000 sq ft home runs $4,500–$7,000 (1.5–2 tons), 1,500 sq ft runs $6,000–$8,500 (2.5–3 tons), 2,000 sq ft runs $7,000–$11,500 (3.5–4.5 tons), 2,500 sq ft runs $8,500–$13,500 (4.5–5 tons), and 3,000+ sq ft runs $10,000–$16,000+ (5+ tons). In-between sizes land proportionally in between.
Efficiency premium over the 13–14 SEER baseline: 15–16 SEER +$1,400 · 17–18 SEER +$2,200–$2,700 · 19–21 SEER +$3,800–$4,300 · 22–26 SEER +$6,100–$9,400.
Cross-check against the published tier pricing for a 2,000 sq ft home: entry-level systems run $5,000–$8,300, mid-range $8,300–$12,500, and high-end variable-speed systems $12,500–$14,000+ — the same story told by feature tier instead of SEER number. All figures exclude ductwork modifications.
🔍Finding your inputs▼
How big is your home? Count only the space the AC actually conditions — finished, cooled square footage, not the garage or an unfinished basement. If you're between sizes or your home is unusual (cathedral ceilings, huge windows, poor insulation), treat the result as the starting range: the load calculation in a real bid can move tonnage a half-ton either way.
How efficient a system? The honest decision framework: hot-climate homes with long cooling seasons (the South, the Southwest) recoup high-SEER premiums through summer bills and should look hard at 17+ SEER. Mild-summer homes struggle to amortize anything past the 15–16 value tier. Two non-negotiables regardless: you can't buy below the federal minimum for your region (14 SEER north/southwest, 15 southeast), and if humidity is your complaint, the variable-speed top tier is the actual fix — it runs long, slow, dehumidifying cycles that single-stage units can't. Note that compressor staging is its own axis: two-stage comfort is available from 15 SEER up (a 15.2 SEER two-stage is a perfectly normal purchase), so shop the SEER number for efficiency and the staging for comfort.
⚠️Special situations▼
My AC died mid-heat-wave and I need it replaced now
You're buying in the worst market of the year — installers are booked and urgency premiums are real. Triage: a $150–$650 repair that buys even one more season lets you replace in the shoulder season (fall/spring), when quotes soften and calendars open. If replacement truly can't wait, get at least two bids even under pressure — phone quotes from reputable outfits take hours, not days, and the spread between two emergency bids routinely covers the effort.
My system still uses R-22 (or R-410A) refrigerant
That's the retirement letter. R-22 is fully phased out — a leak means recharging with reclaimed refrigerant at painful prices — and R-410A is now being phased down behind it. Any significant repair on these systems is money into a platform the industry is abandoning. New systems use R-32 or R-454B; when you replace, you exit the refrigerant treadmill entirely.
The bid proposes a bigger unit than this calculator suggests
Ask to see the load calculation — the sentence that separates real HVAC contractors from guessers. Bigger is not safer: an oversized AC short-cycles, cools the air without dehumidifying it (cold and clammy), and wears itself out faster. If the answer is 'we always go a half-ton up,' get another bid. A legitimate upsize has a reason attached: bad insulation, western glass, added square footage.
Should I replace the furnace or air handler at the same time?
If it's 12+ years old, probably — the labor overlaps substantially, a matched system carries one warranty and one efficiency rating, and a new AC paired with a dying blower motor is a callback waiting to happen. If the furnace is under 8 years old, keep it; just confirm the new AC's indoor coil is compatible. The awkward 8–12 year middle is a judgment call that a trustworthy contractor will walk you through rather than upsell through.
I'm choosing between repairing a 13-year-old unit and replacing it
Run the 50% rule with the age weighting: at 13 years, the system is past its 10–15 year design life, so even a $700 repair is buying months, not years. Add the running-cost angle — a 13-year-old builder-grade unit is likely 10–13 SEER, so a new 15–16 SEER system cuts cooling bills meaningfully from day one. The repair that makes sense on a 6-year-old system is throwing good money after bad on a 13-year-old one.
❓Common questions▼
How much does it cost to replace central air?
Central AC replacement costs $4,500–$7,000 for a small 1,000 sq ft home, $7,000–$11,500 for a typical 2,000 sq ft home, and $10,000–$16,000+ past 3,000 sq ft — installed, at standard efficiency. Higher-efficiency systems add $1,400 (15–16 SEER) to $9,400 (22–26 SEER) on top. All figures exclude ductwork repairs or modifications, which are priced separately.
What size central AC do I need?
Roughly: 1.5–2 tons for 1,000 sq ft, 2.5–3 tons for 1,500, 3.5–4.5 tons for 2,000, and 5+ tons past 2,500–3,000 sq ft — the rule of thumb runs 16–30 BTUs per square foot. But treat that as the starting point: a proper load calculation weighs insulation, window area and orientation, ceiling height, and climate, and it's the difference between a system that fits and one that short-cycles. Any bid without one is a guess.
Is a higher SEER rating worth it?
It's a climate bet. Each SEER tier costs more up front — $1,400 for the 15–16 value tier, up to $9,400 more for 22–26 — and pays back through lower summer bills, so the length of your cooling season decides. Hot-climate homes running AC six months a year amortize high SEER quickly; short-summer homes rarely recoup past the value tier. The exception: if humidity or noise is your complaint, the variable-speed top tier fixes both regardless of payback math.
Should I repair or replace my AC?
Repair when the system is young and the fix is small — AC repairs run $150–$650, and a 6-year-old unit with a bad capacitor has years left. Replace when the signals stack: 10–12+ years old, a repair quote at 50% or more of replacement cost, R-22 or R-410A refrigerant, steadily climbing bills, or uneven cooling. Age is the multiplier — the same $700 repair is sensible at year 6 and money wasted at year 13.
How long does AC replacement take?
A straight swap — new unit, same location, healthy ducts — takes 4 to 14 hours, typically one day. Add ductwork modifications and it stretches to 2–3 days. The schedule reality matters more than the hours: mid-summer, installers book out weeks, while shoulder-season replacements happen fast and often cheaper. If your system is limping toward the end, replacing on your schedule beats replacing on its.
Why do AC quotes vary so much for the same house?
Usually four things: what's included (ductwork, permits, disposal, a matching indoor coil — the classic gaps), the brand and tier being quoted (single-stage builder-grade vs. variable-speed premium spans thousands), whether a real load calculation happened, and labor rates. Make every bid itemize the unit model number, SEER rating, ductwork scope, and permit — then you're comparing systems instead of guessing at differences.
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