The Lennox AC and furnace combo cost varies widely by system size, efficiency, and installation complexity; homeowners typically pay between $6,000 and $15,000 for a full Lennox central air and gas furnace replacement. Major drivers are tonnage, SEER rating, AFUE rating, and duct or venting work.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Complete Lennox AC + Furnace Combo | $4,500 | $9,500 | $18,000 | Assumptions: 2-4 ton AC, 80%-95% AFUE furnace, standard single-family home, normal access. |
| AC Unit (per ton) | $800 | $1,600 | $3,200 | Includes condenser and evaporator coil; higher for Variable-Speed/XL series. |
| Furnace (per unit) | $1,200 | $3,500 | $6,500 | Depends on AFUE, modulating burners, and stainless heat exchanger. |
| Installation Labor | $1,200 | $3,000 | $6,000 | Typical 10-25 hours. |
Total Price For Replacing A Lennox AC And Furnace Combo
Replacing both an AC and furnace together with Lennox equipment usually costs $6,000-$15,000 for most U.S. homes. A typical mid-range install: $8,000-$11,000 for a 3-ton AC and 95% AFUE gas furnace with standard ductwork.
Assumptions: suburban installer, standard single-story 1,800-2,500 sq ft home, gas hookup present, no major duct changes.
Price Breakdown By Materials, Labor, Equipment, And Permits
Buyers should expect materials and labor to be the largest line items; permits and disposal are smaller but non-negligible.
| Cost Component | Low | Average | High | Notes |
|---|---|---|---|---|
| Materials (units & parts) | $2,000 | $4,000 | $9,000 | AC condenser, furnace, coil, controls; higher for premium Lennox models. |
| Labor | $1,000 | $2,500 | $5,500 | 10-30 hours; Typical rates $75-$150/hr. |
| Equipment & Tools | $150 | $400 | $1,200 | Vacuum pumps, recovery machine, lifts. |
| Permits & Inspections | $50 | $300 | $900 | Local codes vary; gas line permits add cost. |
| Delivery/Disposal | $75 | $250 | $700 | Old-unit disposal and refrigerant recovery fees. |
How System Size, SEER Rating, AFUE, And Zoning Change Price
System capacity and efficiency significantly change the quote: a 2-ton Lennox AC is roughly $2,000-$4,000 while a 5-ton can be $5,000-$10,000. Moving from SEER 14 to SEER 18 can add $800-$2,500; upgrading AFUE from 80% to 98% can add $1,000-$3,000 to furnace cost.
Numeric thresholds: 2.0-2.5 ton (small homes), 3.0-3.5 ton (typical 1,800-2,200 sq ft), 4.0+ ton (large homes or high cooling load).
How Regional Markets And Climate Affect Lennox Combo Pricing
Prices vary by region: urban Northeast and West Coast typically run 10%-25% higher than Midwest and South. Climate influences capacity choices—hotter climates often need 3.5-5 ton systems, raising total cost.
Estimate modifiers: +15%-25% in high-cost metros; -5%-15% in rural or low-cost regions.
Typical Installation Time, Crew Size, And Labor Rates To Expect
A full combo swap usually requires 10-30 labor hours and a 2-3 person crew; expect $75-$125 per hour per technician depending on locale.
Common timelines: 1-day swap with like-for-like ducting, 2-3 days with duct modifications or high-efficiency gas line work.
Three Real-World Quote Examples With Specs And Totals
Concrete examples help compare: each combines equipment, labor, and common add-ons.
| Scenario | Specs | Labor Hours | Estimate |
|---|---|---|---|
| Budget Replace | 2.5-ton AC SEER 14 + 80% AFUE furnace, standard coil | 12 | $4,500-$6,000 |
| Mid-Range | 3-ton AC SEER 16 + 95% AFUE Lennox mid-tier | 18 | $8,000-$11,000 |
| High-End | 4-4.5 ton variable-speed AC SEER 18-20 + 98% AFUE modulating furnace, zoning | 24-36 | $14,000-$18,000+ |
How To Lower Lennox Combo Price By Controlling Scope And Timing
Buyers can reduce cost by choosing lower SEER/AFUE tiers, scheduling installs off-season, and avoiding unnecessary duct replacement. Getting three competitive quotes and accepting non-peak scheduling can often save 8%-18%.
Other actionable steps: prepare access (clear attic/garage areas), keep current ducting if in good shape, and bundle thermostat or air-sealing work with the installation to reduce mobilization fees.
Common Add-Ons, Warranties, And Fees That Increase Final Invoice
Expect extra charges for smart thermostats ($200-$600), zoning systems ($800-$3,500), advanced air cleaners ($400-$1,200), and extended warranties ($300-$1,000). Gas-line upgrades or condensate pump installs can add $250-$1,200 each.
Plan for a 5%-10% contingency for unexpected duct repairs or code-required venting changes.