Replacing an air conditioner and furnace together typically costs $7,000-$16,000 installed, with many standard homes landing near $11,000. Equipment capacity and efficiency, ductwork condition, local labor rates, and electrical or code upgrades have the biggest effect on the final quote.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| AC and furnace replacement | $7,000 | $11,000 | $16,000 | Standard central split system, installed |
| Air conditioner | $3,500 | $5,500 | $8,500 | Equipment and installation |
| Gas furnace | $3,000 | $4,500 | $7,500 | Equipment and installation |
| Combined installed rate | $7-$10 | $11-$18 | $19-$30 | Per sq ft; rough budgeting only |
Assumptions: 1,500-2,500-square-foot home, standard-efficiency equipment, existing ducts in usable condition, and ordinary access.
What a Typical AC and Furnace Replacement Costs
A complete changeout usually includes a matched outdoor AC condenser and indoor evaporator coil, plus a gas furnace, thermostat connection, refrigerant lines as needed, startup, and testing. The price range assumes replacement in the existing locations without major ductwork changes. For a standard home, budgeting $9,000-$13,000 is a practical starting point.
Smaller homes with straightforward access and basic equipment may come in near $7,000-$9,000. Larger homes, premium variable-speed systems, or complicated installations can exceed $16,000. A heat pump paired with a furnace, often called a dual-fuel system, may cost more than a conventional AC-and-furnace package.
How Equipment, Labor, and Removal Shape the Quote
Contractor quotes can package costs differently, so comparing line items helps reveal what is included. The following ranges describe common contributions to a combined installation; they are not fixed add-ons and may overlap with a bundled price.
| Quote component | Typical range | What it covers |
|---|---|---|
| AC and furnace equipment | $4,000-$9,000 | Matched units, coil, and standard controls |
| Installation labor | $2,000-$4,500 | Removal, set, connections, and commissioning |
| Materials and accessories | $300-$1,500 | Lines, pad, fittings, drain, and small electrical parts |
| Equipment removal and disposal | $150-$600 | Old units and refrigerant handling |
| Permits and inspection | $50-$500 | Local fees where required |
Labor often represents a substantial share of the installed price. A simple changeout may need a two- or three-person crew for 8-12 hours; duct, venting, or electrical corrections can extend the job. Ask whether startup testing, disposal, permits, and warranty registration are included rather than assuming they are.
Why Tonnage, Furnace Size, and Efficiency Change the Price
AC capacity and furnace output should match the home’s heating and cooling load, not simply its square footage. A typical 1,500-square-foot house might need roughly 2-3 tons of cooling, while a 2,500-square-foot home may need about 3-5 tons. Climate, insulation, windows, ceiling height, and duct design can shift those estimates substantially.
Moving from a basic single-stage AC to a two-stage or variable-speed model can add about $1,000-$4,000 to the equipment-and-installation price. A higher-efficiency gas furnace, such as 95%-98% AFUE instead of a basic 80% model, may add roughly $500-$2,000. High-efficiency furnaces may also require new venting or a condensate drain. Oversizing can raise the quote and reduce comfort, so a load calculation is more useful than choosing by tonnage alone.
What Two Realistic Replacement Quotes Might Include
For a 1,700-square-foot home needing a 2.5-ton AC and 60,000-BTU furnace, a standard matched system might total $8,500-$11,500. A straightforward crew installation of 8-10 hours, routine disposal, and no duct repairs would support the lower-to-middle portion of that range.
For a 2,400-square-foot home with a 4-ton AC and 80,000-BTU two-stage furnace, a quote may reach $12,000-$16,500. That example assumes more expensive equipment and 10-14 labor hours, with possible thermostat or venting changes. These are illustrative totals, not bids; the home’s load and site conditions determine the actual equipment and work.
How Regional Labor Rates Affect Installed Prices
Prices commonly run 10%-20% above broad national expectations in high-cost metro areas, where labor, permitting, and business overhead are higher. Rural markets may be 5%-15% lower, although limited contractor availability or long travel distances can erase the difference. Hot-weather markets can also see stronger demand for AC work during peak summer.
Compare at least three written quotes from licensed, insured contractors serving the same area. Check whether each includes the same capacity, efficiency, staging, coil, thermostat, duct adjustments, and warranty. A lower quote may reflect a smaller scope rather than a better price for equivalent equipment.
When Ductwork, Electrical Work, or Venting Adds Expense
Replacing a furnace and AC does not automatically require new ducts. Sealing or repairing a few accessible sections may cost $300-$1,500, while extensive duct replacement can run $2,000-$7,000 or more depending on access and layout. A new circuit, disconnect, or wiring correction may add $200-$1,000; furnace venting changes can add several hundred to a few thousand dollars.
Thermostat upgrades often cost $150-$600 installed, and zoning changes can add $1,500-$3,500. Local permits may be required, and some older homes need code-related changes. Have the contractor identify required corrections separately from optional upgrades in the estimate.
How Repair, Replacement, and Efficiency Compare
If only one unit has failed and the other is relatively new, replacing that component may be less expensive, but compatibility and warranty coverage matter. A standalone AC replacement often costs $3,500-$8,500 installed, while a gas furnace replacement commonly costs $3,000-$7,500. Replacing both together can reduce duplicated setup labor, but it is not automatically the best choice when one unit has years of useful life remaining.
Higher-efficiency equipment can reduce energy use, but the payback depends on utility rates, climate, operating hours, and the price premium. Ask for estimated annual operating costs using the home’s usage, and compare them with the added equipment cost. Do not pay for efficiency features without checking their expected savings for that specific home.
Ways to Keep the Combined System Price in Check
Schedule replacement before an emergency when possible, since urgent work during extreme weather can limit scheduling choices. Keep the existing layout when it is safe and properly sized, and avoid replacing usable ducts or upgrading controls without a clear reason. Standard single-stage equipment is usually less costly than communicating or variable-speed systems.
Request itemized bids with equipment model numbers, labor scope, disposal, permits, warranties, and payment terms. Check rebates or utility incentives for qualifying high-efficiency equipment, but verify eligibility and application deadlines before counting them against the price. Comparing equivalent written proposals is the most reliable way to identify savings without cutting necessary installation work.