Average Cost of Furnace and Air Conditioner Replacement

The average cost of furnace and air conditioner replacement in 2026 runs roughly $8,000 to $16,000 for a complete matched system installed, with most homeowners landing near $11,000 to $12,000. That is a big number, and it surprises a lot of people who expected a furnace to be a few thousand dollars. The reason the two get quoted together is simple: when your furnace and AC share the same age and the same ductwork, replacing them as a pair is almost always cheaper than doing them separately a year apart. This guide breaks the price into equipment and labor, shows you what drives the figure up or down, and points out where the real savings hide.

The Big Picture: Full System Price Ranges

Replacing both units at once, a furnace plus a central AC condenser and matching coil, spans a wide range depending on size and efficiency:

• Budget builder-grade system: $8,000 to $10,000 installed.
• Mid-range, high-efficiency: $11,000 to $14,000 installed.
• Premium, variable-speed, high-SEER2: $15,000 to $20,000+ installed.

These figures assume your existing ductwork stays in place and is in decent shape. Add duct repairs or replacement and the total climbs quickly, which is why the honest answer to “what does it cost” always starts with an in-home assessment.

Furnace Cost Breakdown

A gas furnace on its own, installed, typically runs $3,000 to $7,500. The equipment itself is $1,500 to $4,000 depending on efficiency and staging, and labor makes up the rest. Efficiency is measured in AFUE, the percentage of fuel converted to heat:

• 80% AFUE single-stage: the budget standard, lowest upfront cost.
• 90 to 96% AFUE condensing: mid-range, requires a PVC exhaust vent, saves on fuel.
• 97%+ modulating, variable-speed: premium comfort and efficiency, highest price.

Sizing is measured in BTUs, and bigger is not better. An oversized furnace short-cycles, wearing itself out and leaving temperature swings, so a proper load calculation matters more than raw capacity.

Air Conditioner Cost Breakdown

A central AC replacement alone, the outdoor condenser plus a matched indoor evaporator coil, generally costs $4,000 to $9,000 installed. The condenser and coil equipment run $2,000 to $5,000, with labor and refrigerant charging making up the balance. AC sizing is measured in tons, where one ton equals 12,000 BTUs of cooling. A typical home needs 2 to 5 tons depending on square footage, climate, insulation, and sun exposure.

Efficiency here is rated in SEER2. Baseline units start around 14 to 15 SEER2, while high-efficiency two-stage and variable-speed models reach 18 to 20+ SEER2. Every jump in SEER2 costs more upfront but trims your summer electric bills, and the payback depends heavily on how hot and long your cooling season is.

Equipment vs. Labor Split

On a full replacement, equipment and labor tend to split roughly half and half, though it varies. A typical $12,000 job might break down as $6,000 to $7,000 in equipment, coil, furnace, condenser, and thermostat, and $5,000 to $6,000 in labor, permits, refrigerant, and materials. Labor is not padding: a proper install involves setting the furnace, brazing refrigerant lines, pulling a vacuum on the system, charging refrigerant to spec, wiring controls, and commissioning the system. A cheap install that skips the vacuum and charge steps will haunt you with poor efficiency and early failures, so labor quality genuinely matters.

What Drives the Price Up or Down

Several factors move your quote within, or beyond, the typical range:

• System size: a 2-ton home costs far less than a 5-ton one.
• Efficiency tier: high-SEER2 and modulating equipment add thousands.
• Ductwork condition: leaky or undersized ducts may need sealing or replacement.
• Fuel and venting changes: switching to a condensing furnace adds PVC venting and a condensate drain.
• Accessibility: a cramped attic or tight crawlspace raises labor hours.
• Refrigerant type: newer low-GWP refrigerants and updated components affect cost.
• Region and season: labor rates and demand swing prices, with summer and winter peaks costing more.

Extra Costs People Forget

The base equipment quote is rarely the final number. Budget for these add-ons:

• Permits and inspection: $100 to $500 depending on jurisdiction.
• New thermostat: $150 to $400 for a smart model, often bundled.
• Ductwork repair or sealing: $500 to $2,500 if needed.
• Pad, disconnect, and whip for the outdoor unit, a few hundred dollars.
• Removal and disposal of the old equipment, usually included but worth confirming.

Always get an itemized quote so you can see exactly what is and is not covered.

How to Save Money

You can meaningfully lower the total without cutting corners on quality. Replace both units together to share the labor and the crew’s trip charges. Get at least three detailed quotes, since HVAC pricing varies widely between contractors for identical equipment. Right-size the efficiency to your climate; a 20-SEER2 unit rarely pays off in a mild-summer region. Look for manufacturer rebates, utility incentives, and federal tax credits, which can knock hundreds to a couple thousand dollars off a qualifying high-efficiency system. And schedule in the shoulder seasons, spring or fall, when contractors are less slammed and sometimes discount to fill their calendars.

Gas Furnace and AC vs. a Heat Pump

One decision that shapes the whole quote is whether to replace like-for-like with a gas furnace and separate AC, or switch to a heat pump that handles both heating and cooling in one system. A heat pump uses the same outdoor unit to cool in summer and heat in winter by reversing the refrigerant flow, which can dramatically cut heating bills in mild and moderate climates where you would otherwise burn gas. In 2026, heat pumps also carry the most generous rebates and tax credits, which can offset thousands of dollars. The trade-off is that in very cold regions a heat pump may need a backup heat source or a cold-climate rated model, and if you have cheap natural gas, a high-efficiency gas furnace can still be cheaper to run in deep winter. For many homeowners replacing both units anyway, pricing a heat pump alongside the traditional furnace-and-AC combo is well worth doing.

Matched Systems and Efficiency Ratings

When you replace both units, buy them as a matched system rather than mixing an old coil with a new condenser. The furnace, coil, and condenser are engineered to work together, and the published SEER2 and AFUE ratings only hold when the components are properly matched. Pairing a new high-efficiency condenser with a mismatched or aging coil can drop real-world efficiency well below the rating on the box, wasting the premium you paid. A reputable installer will specify an AHRI-matched combination, and you should ask to see that the system is listed as a certified match. This is also why replacing both units together often makes sense: you guarantee the pairing, capture the full rated efficiency, and avoid the compromise of bolting new equipment onto old.

Airflow ties it all together. Even a perfectly matched, high-efficiency system underperforms if the ductwork is leaky or undersized, so a good contractor checks static pressure and airflow during installation. If your ducts are the bottleneck, addressing them, sealing, resizing a return, or adding a duct, protects the investment you just made in equipment.

Financing is worth a mention because a $12,000 project is a lot to pay at once. Many HVAC contractors offer financing plans, and manufacturers periodically run promotional low-interest or deferred-interest offers on qualifying systems. Some utilities and state programs also provide low-cost loans specifically for energy-efficiency upgrades. Just read the terms carefully, since a deferred-interest plan that balloons if you miss the payoff date can cost far more than a simple installment loan. Weigh the monthly payment against the operating savings a new system delivers, because a modern high-efficiency furnace and AC quietly lowers your bills every month, offsetting part of the financing cost.

When Replacement Beats Repair

If your system is 12 to 15 years old and facing a major repair, replacement usually wins. A common rule: if the repair cost times the unit’s age in years exceeds about 5,000, replace it. Older units also run on outdated refrigerants that are increasingly expensive, and their lower efficiency quietly costs you every month. Replacing a tired furnace and AC together is a large check to write, but at $11,000 to $12,000 for a solid mid-range system, you are buying 15 years of reliable comfort and lower operating bills, which makes the average cost of furnace and air conditioner replacement easier to justify than it first appears.