Below: full replacement prices by efficiency and home size, the ductwork question that swings quotes by thousands, rebates that actually exist, and the sizing mistake that ruins new systems.
The Short Answer: What You Will Pay
For a standard central air system, condenser plus indoor coil, installed with permits and removal of the old unit, expect $5,000 to $7,500 for a basic 14.3 SEER2 system, $7,500 to $10,500 for a mid-efficiency 16 to 18 SEER2 system, and $10,000 to $15,000 for a high-efficiency variable-speed system at 20 SEER2 or above. The national average for a straightforward replacement on a typical 2,000-square-foot home lands around $7,000 to $9,000. Those ranges assume your ductwork is in good shape. If it is not, add $2,000 to $5,000, which is where most $12,000 quotes come from, and sometimes they are right.
Replacement Cost by Efficiency Tier (2026)
- Basic, 14.3 SEER2 ($5,000-$7,500): Single-stage compressor, the minimum legal efficiency in most of the country. Cheapest upfront, highest running costs, loudest operation. Makes sense for a home you plan to sell within a few years, or a rental.
- Mid-efficiency, 16-18 SEER2 ($7,500-$10,500): Two-stage compressor, quieter, better humidity control, and the sweet spot for most homeowners. Typically cuts cooling bills 20 to 30 percent versus a 15-year-old system.
- High-efficiency, variable-speed 20+ SEER2 ($10,000-$15,000): Runs continuously at low speed instead of cycling on and off. The most comfortable system you can buy, the best humidity control, and the quietest. Pays off in hot climates with long cooling seasons, and much less so in mild ones.
- Heat pump instead of straight AC ($7,000-$14,000): Heats as well as cools, which can replace a furnace in mild climates or cut heating bills sharply in mixed ones. If your furnace is also old, a heat pump plus air handler can be cheaper than replacing both separately.
Replacement Cost by Home Size (2026)
- Up to 1,200 sq ft, 1.5-2 tons ($5,000-$7,500): Small homes, condos, and single-story ranches. One zone, short duct runs, usually a one-day install.
- 1,200-2,000 sq ft, 2.5-3.5 tons ($6,500-$10,000): The typical American home. Most quotes in this band, and most of the tier spread above, live here.
- 2,000-3,000 sq ft, 4-5 tons ($9,000-$14,000): Larger homes often need a bigger system, longer line sets, and sometimes a second zone or return. Two-day installs are common.
- Over 3,000 sq ft ($12,000-$20,000+): Frequently two systems, not one big one. A single oversized system cools unevenly and short-cycles; two properly sized systems cost more upfront and work far better.
Ductless Mini-Splits, Priced Separately
If your home has no ductwork, or you only need to cool an addition, a garage conversion, or a hot upstairs bedroom, a ductless mini-split avoids the duct question entirely. A single-zone mini-split costs $3,000 to $6,000 installed. A multi-zone system with three to four indoor heads costs $8,000 to $15,000. Mini-splits are also the most efficient option per room cooled, with many systems rated above 20 SEER2, and they let you cool only the rooms you use.
The Ductwork Question That Swings Quotes by Thousands
Here is why your two quotes differ. One contractor assumed your ducts are fine. The other priced replacing them. Leaky, undersized, or collapsing ducts can waste 25 to 40 percent of the air your new system produces, which means a brand-new high-efficiency system performing like an old one. Full duct replacement costs $2,000 to $5,000 for a typical home; duct sealing and insulation alone costs $1,000 to $3,000 and fixes most problems. Before you accept a quote that includes new ducts, ask for a duct leakage test result, not an opinion. A test costs $200 to $400 and tells you whether the ducts are actually the problem. If a contractor will not test and still wants to replace them, that is a padded quote.
What Else Is in the Quote (and What Gets Added Later)
- Permits and inspection ($300-$800): Required in most jurisdictions. A contractor who skips permits is not saving you money, they are leaving you with an unpermitted system that complicates a future sale and can void the manufacturer warranty.
- Electrical upgrades ($300-$1,500): A new disconnect, whip, or breaker, and occasionally a panel upgrade if the old panel is full or unsafe. Common on homes with panels from the 1970s and 80s.
- Concrete pad and line set ($200-$600): A new pad for the condenser, a new refrigerant line set if the old one is the wrong size or contaminated, and condensate drain work.
- Thermostat ($0-$400): Often included with mid and high-tier systems. A smart thermostat is worth taking when it is included, and worth $250 to $400 when it is not.
- Old unit removal and disposal ($0-$300): Usually included. Refrigerant recovery is legally required, so a quote that charges extra for "freon disposal" on top of removal deserves a question.
Rebates: Real Money, But Check Before You Count On It
Rebate programs change every year, so treat any contractor's rebate promise as a lead, not a guarantee. Utility rebates are the most reliable: many utilities pay $300 to $1,000 for a high-efficiency system or a heat pump, and some pay for duct sealing too. Manufacturer rebates run seasonally, typically $200 to $500 in spring and fall. Federal tax credits for HVAC have changed repeatedly in recent years, so confirm the current rules for 2026 with the IRS guidance or your tax professional before subtracting anything from a quote. The honest way to compare quotes is pre-rebate, with rebates treated as a bonus, because a quote that only wins after an assumed rebate is a quote that loses if the rebate does not come through.
The Sizing Mistake That Ruins New Systems
Bigger is not better with air conditioning. An oversized system cools the house fast, shuts off, and never runs long enough to dehumidify, leaving you cold and clammy, with mold risk in the ducts and a compressor that short-cycles itself to an early death. Correct sizing comes from a Manual J load calculation, which accounts for your home's square footage, insulation, windows, orientation, and local climate. It takes a good contractor 1 to 2 hours. If a contractor sizes your system by square footage alone, or by "the same size as the old one," get another quote. The old system may have been wrong for 20 years, and rules of thumb are how wrong sizes get installed twice.
Repair or Replace, One Last Time
If your system is under 10 years old and the repair is under $1,000, repair it, see our AC repair cost guide for the full price list. If it is over 15 years old, uses R-22 refrigerant, or has needed three repairs in two years, replace it. The middle case, 10 to 15 years old with a $1,000 to $2,000 repair, is a judgment call: replace if your summer bills are climbing, if rooms are unevenly cooled, or if the system uses R-22, because the next repair is already on its way. A new 16 SEER2 system replacing a 15-year-old 10 SEER unit typically saves 30 to 40 percent on cooling costs, which on a $200 summer monthly bill is $60 to $80 a month back, every summer, for 15 to 20 years.
5 Ways to Avoid Overpaying
- Get three quotes, and make them quote the same tier. A basic quote, a mid quote, and a premium quote are not comparable. Ask each contractor to price a 16 SEER2 system so you are comparing scope, not salesmanship.
- Demand a Manual J in writing. It is the difference between a sized system and a guessed system, and it is the first thing a quality contractor will offer.
- Ask for the duct leakage test before approving duct work. Duct replacement without a test result is the most common padding in replacement quotes.
- Compare pre-rebate prices. Rebates change and sometimes fall through. The best quote is the best quote before anyone subtracts a hypothetical rebate.
- Check the warranty split. Parts (usually 10 years, registered), labor (1 to 2 years standard, up to 10 with an extended plan), and compressor (often 10 years) are separate. A cheap quote with a 1-year labor warranty is not cheaper than a mid quote with 5 years of labor coverage.
Get Your Number Before Summer Decides For You
Run your home size through our free cost calculator for an instant range, then line up quotes from HVAC contractors near you. If your current system is still running, our AC maintenance cost guide shows what a tune-up should cost and what it should include, and our HVAC installation cost guide covers full heating-and-cooling replacements. The cheapest AC replacement is the one you price in spring, not the one you buy during the first heat wave.
