Furnace & AC Replacement Cost (2026 Guide)

By HomeCost Guide · Updated October 2026 · Rough midpoint of published combined-system ranges; covers furnace, condenser, coil, lineset, labor, and permits

Replacing a furnace and air conditioner together costs $7,500 to $15,000 for most homes, with about $11,000 as a rough midpoint. That covers the furnace, outdoor condenser, indoor coil, refrigerant lineset, labor, permits, and disposal. Basic equipment in a small home can land near $6,500; premium high-efficiency combos in large homes push past $18,000.

Bundling is one of the few genuine discounts in HVAC: one visit typically saves $750 to $1,000 versus separate jobs — one mobilization, one permit, one disposal run, and a blower matched to the new coil from day one. But bundling isn't always smart. If your furnace is 8 and healthy while the AC just died, junking the furnace wastes more than the discount saves. This guide covers the combined-system math, when to bundle and when not to, the hidden add-ons, and how to compare bids. The sections below break down the combined-system math, the bundling discount, the hidden add-ons that inflate quotes, and how to compare bids apples to apples.

1. Furnace & AC Replacement Cost (2026 Guide) cost breakdown

Sources disagree: Filterbuy cites $7,500–$15,000 for a full change-out; a contractor-authored guide cites $9,000–$18,000 nationally. Equipment tier drives everything — builder-grade in a small home sits near the bottom, premium high-efficiency in a large home near the top. Budget the midpoint of the range matching your equipment ambitions, plus 15% contingency.

Where the money goes: labor vs materials vs fees

• Labor (combined install)$1,500–$3,500One crew visit instead of two: one mobilization, one setup, one dispatch fee. Bundling typically saves $750–$1,000 versus separate jobs.
• Furnace + indoor coil$2,000–$6,50080% AFUE single-stage at the low end; 96–98% modulating with variable-speed blower at the high end. The AC's indoor coil mounts on the furnace — matched by design.
• Condenser + lineset$2,000–$6,000Outdoor condenser, refrigerant lineset, pad, disconnect, and charge. SEER2 is the price lever: 14.3 SEER2 versus 18–20 adds $2,000–$4,000.
• Permits, inspection, disposal$400–$1,800One mechanical permit covers both appliances in most areas. Includes gas test, electrical inspection, disposal, and federally required refrigerant recovery.

Sources: Filterbuy HVAC Solutions, The Cooling Company, Watkins Heating, USA Today. Figures are national averages compiled from published industry data; your price will vary by home and location.

2. Signs you need both the furnace and AC replaced

Signs you need both the furnace and AC replaced

• Both units are 12–15+ years old. Installed together, aging together — when the compressor is failing and the heat exchanger is rusting, one repair just delays the other.
• 3+ service calls in two years across both systems. The repair treadmill: $300 here, $500 there, and the breakdowns continue.
• Energy bills up 20%+ in both heating and cooling seasons. System-wide efficiency loss, not a single fixable fault.
• The AC still uses R-22 refrigerant. Recharging is prohibitively expensive; any major repair funds a dead technology.
• A single repair quote over $2,000 past age 12, or age × repair cost crossing $5,000. The money belongs in the bundled replacement.

3. How a combined furnace and AC replacement works

How a combined furnace and AC replacement works

1. Load calculation and assessment. Manual J load calculation, ductwork inspection, electrical panel check, gas line review. Technology-switch options (heat pump) get discussed here. Expect 45–90 minutes.
2. Teardown and refrigerant recovery. Gas and power off, old refrigerant recovered (federally required), lineset disconnected, old furnace/coil/condenser hauled out. New condenser pad set.
3. Furnace, coil, gas, electrical. New furnace set with coil mounted; gas piped with sediment trap and shutoff; flue or PVC venting connected; condensate drain run; 240V condenser circuit wired.
4. Condenser and refrigerant charge. Condenser set on pad, copper lineset run, system evacuated with a vacuum pump to remove moisture, then charged with refrigerant.
5. Startup and inspection. Furnace combustion verified (gas pressure, temperature rise), AC charge verified (superheat/subcooling), airflow checked, thermostat programmed. Permit inspection closes the job.

4. What affects the cost

Equipment tier: budget to premium

An 80% single-stage furnace with a 14.3 SEER2 AC is the entry combo (~$7,500–$10,000 installed); a 98% modulating furnace with a 20 SEER2 variable-speed AC pushes $16,000–$22,000. Efficiency saves roughly $200–$500/year combined in climates with real heating and cooling seasons — but only if you stay long enough. A 15-year payback on a system you sell in 5 years is money left on the table. Size the investment to your tenure.

Home size and capacity

Each ton of cooling (~500–600 sq ft) adds roughly $1,000–$1,500; each 20,000-BTU furnace step adds $200–$500. Per USA Today 2026: $6,000–$10,000 at 1,500 sq ft, $7,000–$12,000 at 2,000 sq ft, $9,000–$16,000 at 3,000 sq ft. Larger homes also tend to trigger the electrical and ductwork upgrades smaller homes escape. Larger homes also tend to trigger the electrical panel and ductwork upgrades that smaller homes escape — another reason per-square-foot rules of thumb mislead.

Matched-system efficiency

The furnace's blower and the AC's evaporator coil are a matched pair — the coil sits on the furnace. A new high-efficiency condenser on a 15-year-old blower never reaches rated SEER2 because airflow is wrong. Replaced together, the AHRI-matched combination is certified to its rated efficiency, with one unified warranty instead of two aging timelines. This is the technical case for bundling, beyond the labor savings.

Labor overlap: the bundling discount

One mobilization instead of two ($200–$400). One permit instead of two ($100–$300). One disposal run. One refrigerant evacuation instead of two. Contractors also discount multi-day bookings because they're cheaper to schedule — typically $500–$1,000 off the sum of separate quotes. Real money, but modest: it shouldn't justify junking a healthy 8-year-old furnace early. Contractors also discount multi-day bookings because they're cheaper to schedule than two uncertain one-day jobs.

Ductwork, electrical, and refrigerant extras

Bundling doesn't exempt you from extras — it just means paying them once. Undersized or leaky ducts: $500–$2,700. Full 100-amp panel with no room for the condenser circuit: $1,200–$3,000 panel upgrade. Condensate drain: $150–$400. Gas line extension: $500–$2,000. R-22 system conversion: new lineset required. These can add $1,000–$5,000 to any full-system quote, bundled or not — get them itemized upfront.

Seasonal timing and rebate stacking

Spring and fall: open schedules, manufacturer rebates, no emergency premiums. July and January failures force peak pricing (10–20% more) with zero leverage. If either unit is limping, limp through the extreme season and schedule the combined job in the shoulder season. Watch rebate calendars too — spring AC rebates and fall furnace rebates can overlap in October on one combined job.

Age mismatch: when NOT to bundle

Not always. If the furnace is 8 and healthy while the 16-year-old AC died, replacing only the AC is rational — the $750–$1,000 bundling discount is small next to a $4,000 furnace junked early. Do the math: if the working unit has more than half its expected life left, replace only the failed one. When both are 12–15+ (common — they were installed together), bundling is the obvious call. Check both nameplates first.

Technology switch: heat pump instead

A combined replacement is the natural moment to price a technology switch. A cold-climate heat pump ($6,500–$12,000) can cost less than a furnace-plus-AC combo while eliminating the gas bill — and its federal tax credit (up to $2,000) beats the furnace credit. Catch: the coldest climates still need backup heat, and cheap-gas regions may still heat cheaper with a 96% furnace. Get both quotes before defaulting to like-for-like.

5. Saving money & hiring right

Questions to ask your contractor

• Can I see the Manual J — are both units sized from it, not just matched to the old equipment?
• Are the furnace and condenser an AHRI-matched pair, and what's the rated system efficiency?
• What's included: ductwork, electrical, gas line, condensate, permits, disposal, thermostat — itemized?
• How is the refrigerant handled — lineset replacement or flush, with EPA-compliant recovery?
• What's the parts vs labor warranty on the combined system, and who backs each?

6. How costs vary by state

Combined-system pricing follows regional labor rates; climate decides which side of the system is sized hardest. Planning ranges derived from the $7,500–$15,000 national band — confirm with local quotes.

7. Frequently asked questions