Most homeowners replacing both a gas furnace and central air conditioner pay between $5,500 and $12,500 for a matched combo; the final price depends on system size, efficiency, installation complexity, and region. This article breaks down typical combo price ranges, per-unit rates, major quote line items, and practical ways to reduce the total cost.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Complete Furnace + AC Combo (installed) | $4,000 | $8,000 | $18,000 | Assumptions: 2.5-4 ton AC, 80k–120k BTU furnace, single-family home, standard ductwork. |
| Furnace Only (installed) | $1,200 | $3,500 | $8,000 | Assumptions: mid-efficiency to high-efficiency gas units. |
| AC Condenser + Coil (installed) | $2,000 | $4,500 | $10,000 | Assumptions: 2–4 ton units, includes refrigerant and basic thermostat. |
Typical Total Price For a Furnace and AC Combo Replacement
A homeowner replacing both units together usually pays $5,500-$12,500, with $8,000 as a practical mid-range estimate. Low-end jobs swap like-for-like, use standard-efficiency units, and have simple access; high-end jobs involve high-efficiency furnaces (95%+ AFUE), 16+ SEER ACs, duct upgrades, or multi-story logistics.
Assumptions: Midwest labor rates, 2.5–3.5 ton AC, 80k–100k BTU furnace, 1–2 crews, 8–16 labor hours.
Breakdown Of Quote Lines: Materials, Labor, Equipment, Permits, Delivery/Disposal
Expect the invoice to split into unit materials, installation labor, rigging/equipment, permits/inspection, and removal fees.
| Materials | Labor | Equipment | Permits | Delivery/Disposal |
|---|---|---|---|---|
| $3,000-$10,000 (units, coils, components) | $1,200-$4,000 () | $150-$1,200 (cranes, lifts, specialty tools) | $50-$800 (local) | $100-$600 (old unit haul & disposal) |
Assumptions: Materials include matched system pricing; labor hours depend on access and ductwork condition.
How System Size, SEER Rating, and AFUE Change the Final Quote
System capacity and efficiency move price noticeably: each increase in AC tonnage or SEER adds cost. Examples: upgrading from a 2.5-ton to a 3.5-ton AC typically adds $600-$1,800; moving from 14 SEER to 16 SEER typically adds $800-$2,000; upgrading a furnace from 80% AFUE to 95% AFUE typically adds $800-$2,500.
Other numeric thresholds that affect price: homes >2,500 sq ft often require 3.5–5 ton systems; multi-stage or variable-speed equipment can add $1,000-$4,000 over single-stage models.
Practical Ways To Lower the Replacement Price For a Combo
Control scope: reuse compatible ductwork and thermostat, and avoid optional upgrades during replacement to save thousands. Obtain 3 written quotes, schedule during shoulder seasons (spring/fall) for better contractor availability, and buy standard-efficiency matched systems if fuel/utility rebates are not a factor.
Other tactics: coordinate furnace and AC replacement with other home projects to reduce mobilization fees, and have simple prep done (clear attic access, move obstacles) to cut labor hours.
Regional Price Differences Across The U.S.
Prices vary by region; expect 10–25% higher installed costs in the Northeast and West compared with the Midwest. Rough deltas: Midwest baseline, South -5% to +5% (cheaper labor), Northeast +10% to +25% (higher labor/permit costs), West +10% to +30% (higher material and labor rates).
Assumptions: similar system specs used for comparison; local fuel codes and HVAC licensing can increase costs in some jurisdictions.
Real-World Quote Examples With Specs And Labor
| Scenario | Specs | Labor Hours | Per-Unit Rates | Total |
|---|---|---|---|---|
| Basic Replacement | 3-ton AC 14 SEER + 80k BTU furnace | 10 hours | AC $2,800; Furnace $1,600 | $4,800 |
| Mid-Range Upgrade | 3.5-ton AC 16 SEER + 95% AFUE 100k BTU | 14 hours | AC $4,200; Furnace $3,000 | $8,400 |
| High Efficiency / Complex Install | 4-ton AC 18 SEER + 98% AFUE modulating furnace | 20 hours | AC $6,500; Furnace $5,000 | $15,500 |
Assumptions: quoted totals include basic permits and disposal but exclude major ductwork replacement or structural rigging.
Extra Costs To Watch For During A Combo Replacement
Hidden add-ons that raise the final invoice include duct sealing/repair ($500-$4,000), matched indoor coil upgrades ($300-$900), and electrical panel work ($500-$2,500). Long refrigerant line sets, additional refrigerant, or custom sheet metal work can each add several hundred to a few thousand dollars.
Request itemized line items in the written quote and check whether warranties cover labor, refrigerant, and components to avoid surprise expenses.