Replacing a central air conditioner costs $5,500 to $12,000 installed for most homes, with a typical 3-ton system in a 2,000 sq ft house landing around $7,500 to $9,000. That price covers the condenser, the evaporator coil, a pad, line-set work, crane or disposal fees, and the permit. If a quote comes in far below that range, the most common reason is that it doesn’t include the coil, which is where a lot of “cheap” AC jobs quietly stop being cheap.
Budget at the high end if your system is on a roof or the line-set needs replacing. Budget at the low end if you have a straightforward ground-mount swap with good access and the existing furnace or air handler is in decent shape.
What Actually Drives the Price
| Cost component | Typical range | Notes |
|---|---|---|
| Condenser (outdoor unit) | $2,200 - $4,800 | Depends on tonnage and efficiency tier |
| Evaporator coil | $900 - $2,000 | Should almost always be replaced with the condenser |
| Line-set replacement | $400 - $1,200 | Needed if old copper is kinked, undersized, or contaminated |
| Labor (2 techs, 1 day) | $1,200 - $2,500 | Higher with attic or roof access |
| Crane or lift (roof installs) | $400 - $900 | Sometimes bundled into labor |
| Pad, electrical, disconnect | $200 - $600 | More if the breaker or whip needs upgrading |
| Permit and disposal | $150 - $500 | Refrigerant recovery is not optional |
Tonnage is the biggest single lever. A 1.5-ton unit for a small ranch might use a $2,200 condenser; a 5-ton unit for a two-story in Texas can push $4,800 before anything else. Sizing should come from a load calculation based on your square footage, insulation, windows, and orientation, not from “matching” whatever is sitting outside now. Contractors who guess size by looking at the old unit are guessing, and oversizing costs you in both upfront dollars and humidity control.
Access matters more than people expect. A condenser sitting on a slab beside the house is a one-day job. The same unit in a tight attic crawlspace or on a second-story roof adds hours, safety equipment, and sometimes a crane, and that shows up directly in the quote.
Three Real-World Scenarios
Swap in a single-story ranch, Atlanta. A 2.5-ton, 14.3 SEER2 condenser and matching coil on an existing line-set with a ground pad. Parts run about $3,600, labor $1,500, permit and disposal $300. Total: $5,400. This is close to the floor of what a legitimate install costs.
Two-story in Minnesota, 2,000 sq ft, 3-ton. The old line-set fails inspection, so it gets replaced. Parts reach $4,900 including the new line-set, labor $1,800, electrical and permit $500. Total: $7,200. The line-set added roughly $700 but prevents refrigerant leaks that would otherwise haunt a new unit.
Roof-mounted condenser in Arizona, 4-ton. Crane fee, steeper labor, and a higher-efficiency 16.5 SEER2 unit push this one up. Parts $6,400, labor and crane $2,900, permit $250. Total: $9,550. Same house, same brand, very different number, and every line is defensible.
If your quotes don’t itemize like this, ask for it. A one-line number with “AC and materials” tells you nothing and gives the contractor room to substitute cheap parts later.
How Much SEER2 Is Worth Paying For
The current federal minimum for new central AC in most of the country is 14.3 SEER2, and stepping up to 15.2 or 16.5 typically adds $600 to $2,000 to the job. Whether that premium pays back depends on how much you run the system. In Phoenix or Houston, where the compressor works six months a year, the efficiency jump often pays for itself in seven to ten years. In Minneapolis, where cooling season is short, the same upgrade can take fifteen years or more and may never pay back before the unit dies.
The honest way to decide: get the price difference in writing, then compare it against your actual summer electric bills. If the upgrade saves $120 a year and costs $1,500 more, that’s a twelve-and-a-half-year payback on equipment with a fifteen-year life. Thin. Save the money unless you’re in a hot climate or you value the quieter, two-stage operation that usually comes with the higher tiers.
One caution on incentives: the federal tax credits for efficient AC equipment expired at the end of 2025. Some older articles and a few sales pitches still mention a 30% federal credit. It no longer exists. What remains are state and utility rebates, which vary a lot, so check dsire.org and your electric utility’s site before you size up the premium.
How to Pay Less
Get three quotes in the same week. Prices for identical equipment vary by 20% or more between shops, mostly because of overhead and how booked-out the company is. Late fall and early spring are the cheap windows; everyone wants cooling work in July.
Ask specifically for a matching coil-and-condenser pair from a distributor brand. Equipment from the same factory often carries different badges at different prices, and independent dealers can be several hundred dollars under the big-brand showroom. Just confirm the parts warranty is comparable, because that’s what the badge mostly buys you.
Timing the death of your old unit helps too. If your compressor is limping through its last summer, getting quotes in April beats an emergency replacement during a heat wave, when you have no leverage and no time to compare. Our heat pump payback calculator is worth a look here: if your furnace is also aging, replacing the AC with a heat pump covers both jobs with one unit, and the math sometimes favors it, which we break down in heat pump installation cost.
Mistakes That Cost Homeowners Money
- Replacing the condenser without the coil. Old and new coils aren’t designed for each other, efficiency drops, and warranty claims get denied. Spend the $900 to $2,000.
- Accepting the old line-set unquestioned. Sometimes it’s fine. But if the R-410A line-set is undersized for the new refrigerant or the copper is 20 years old, reusing it is how you get a leak in year two.
- Sizing by the old unit’s label. Houses get new windows, insulation, and additions. A load calc is cheap and it’s the difference between comfortable and clammy.
- Skipping the permit. It’s tempting when a contractor offers, but unpermitted work bites at resale and can void your homeowner’s policy after a fire or a refrigerant incident.
- Ignoring the furnace interface. The AC coil usually sits in or above the furnace plenum. If the furnace is 18 years old, pay attention to the “replace both” conversation in the next section.
For the quote itself, read contractor quote red flags before you sign anything.
When to Replace the Whole System Instead
If your furnace or air handler is more than 15 years old, strongly consider replacing everything at once. The labor overlaps, you save a second mobilization fee, and mixed-generation equipment tends to underperform. As a rough rule, adding a furnace swap to an AC job costs $2,500 to $4,500 more than doing the furnace alone a few years later.
The other case is the heating-swap case. A heat pump does what your AC does and replaces the furnace, and in moderate climates the running costs compete with gas. We lay out the trade-offs in heat pump vs. gas furnace.
Bottom Line
Plan on $5,500 to $12,000, get three itemized quotes, insist on a matched coil, and don’t pay for efficiency your climate won’t use. Check state and utility rebates at dsire.org, ignore anyone promising a federal tax credit, and if the furnace is old, price the combined job now so you’re not surprised into a decision during the next heat wave.
FAQ
How long does a central AC replacement take?
A straightforward swap takes one day, usually four to eight hours with a two-person crew. Add time for line-set replacement, attic or roof access, or electrical upgrades, which can push it to two days. Permit inspection happens separately, often a few days later.
Should I replace just the outside unit?
Usually no. The outdoor condenser and indoor evaporator coil are engineered as a matched set, and mixing generations costs you efficiency and can void the warranty. The only common exception is a nearly new coil that exactly matches the replacement condenser’s specifications.
What size AC do I need for a 2,000 sq ft house?
Most 2,000 sq ft homes need 2.5 to 3.5 tons depending on climate, insulation, sun exposure, and window area. That’s roughly 400 to 600 sq ft of cooling per ton. Get a Manual J load calculation rather than a rule-of-thumb guess, because a wrong-size unit costs you comfort and money for fifteen years.
Is it cheaper to replace AC in winter?
Usually yes, by 10% to 20%, because contractors are hungry between heating and cooling seasons. Fall and early spring are the sweet spots. Emergency July replacements are where you pay retail-plus, since you have no time to comparison shop.