A Lennox 2-stage furnace typically costs $4,500-$8,500 installed, with many standard replacements near $6,300. The Lennox furnace price depends on heating capacity, efficiency, venting and ductwork changes, local labor rates, and whether the old system needs removal.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Furnace equipment | $2,000 | $3,200 | $5,000 | Two-stage gas furnace; model and capacity vary |
| Installed replacement | $4,500 | $6,300 | $8,500 | Standard removal and installation |
| Installed with significant upgrades | $7,000 | $9,000 | $12,000 | May include duct, vent, electrical, or control work |
What a Lennox two-stage furnace costs installed
For a typical home replacing an existing gas furnace, budget $4,500-$8,500 for a Lennox two-stage system, including equipment, standard installation, and removal of the old unit. A common midrange quote is about $6,300. High-efficiency models, difficult access, and changes to venting or ductwork can push the total above that range.
Equipment alone commonly runs $2,000-$5,000 before installation. A contractor may quote around $4,000-$7,000 for a straightforward 60,000- to 100,000-BTU replacement, while larger homes or complex work can exceed $9,000. Furnace sizing should follow a heat-loss calculation, not floor area alone.
Assumptions: U.S. replacement job, natural-gas furnace, standard access, and existing ducts in usable condition. For a like-for-like replacement, $4,500-$8,500 is a practical installed budget range.
How equipment, labor, and venting shape the quote
A complete estimate should separate the furnace from installation work and any required upgrades. This makes it easier to compare contractor quotes and spot exclusions such as permits, disposal, or thermostat setup.
| Quote component | Typical price | What it covers |
|---|---|---|
| Furnace equipment | $2,000-$5,000 | Two-stage unit; capacity and efficiency affect price |
| Installation labor | $1,200-$2,800 | Disconnecting, setting, connecting, and testing |
| Venting and condensate | $300-$1,200 | PVC vent changes or condensate drain work |
| Permit and inspection | $75-$400 | Local fees and required inspection |
| Removal and disposal | $100-$400 | Hauling away the old furnace |
Labor estimates depend on the scope; a basic swap may take 6-10 hours, while venting, gas-line, or duct changes can add time. Ask whether the quote includes startup testing, permit fees, and disposal before comparing totals.
Why furnace capacity, AFUE, and venting change the price
Capacity is a major cost driver. Moving from a 60,000-BTU unit to a 100,000-BTU model may add roughly $300-$900 in equipment cost, but an oversized furnace can cycle inefficiently and may not improve comfort. A professional load calculation can identify the right output for the home and climate.
Many two-stage Lennox models are high-efficiency condensing furnaces, often around 96% AFUE, though specifications vary by model. Replacing an older non-condensing furnace may require new PVC intake and exhaust pipes and a condensate drain, adding about $300-$1,200. A thermostat compatible with two-stage operation may cost $100-$400, plus installation if needed.
Confirm the exact model number, BTU capacity, AFUE rating, and included venting work on the written estimate.
How Lennox furnace prices shift by region
Local labor and permitting can move an otherwise similar quote substantially. In lower-cost rural markets, basic replacement pricing may be 5%-15% below the national midpoint. Major metro areas and parts of the Northeast or West Coast can run 10%-25% higher because of labor rates, access limitations, and code requirements.
These percentages are broad comparisons, not guaranteed regional prices. A suburban installation with easy access can cost less than a rural job requiring a long service trip, while dense urban housing can involve extra equipment handling. Compare at least two local, itemized quotes rather than using a national average as a fixed price.
What installation time and crew size mean for labor
A standard replacement generally uses a two-person crew for most of a workday. At labor rates of roughly $75-$150 per technician-hour, direct labor would calculate to $900-$2,400 for 6-8 hours with two technicians; the final labor line may also include scheduling, insurance, travel, and company overhead.
Work can take 1-2 days if the installer must relocate the furnace, modify supply or return ducts, replace a flue, or correct drainage. Ask the contractor to identify which site conditions could turn a one-day replacement into additional labor.
When ductwork or controls add to the furnace bill
Common extras include duct repairs, new thermostats, gas-line adjustments, and electrical work. Small duct sealing or repairs may cost $200-$800, while replacing a larger portion of ductwork can add $1,500-$5,000 or more, depending on access and the number of runs. A new compatible thermostat typically adds $100-$400 before any additional wiring.
Old venting may also need replacement for a condensing model, and a blocked or poorly routed condensate drain can require extra plumbing. Separate required code or safety corrections from optional comfort upgrades in the proposal.
Repairing the old furnace versus replacing it
A repair may cost $150-$600 for a routine part or service call, while a major control board, inducer, or blower repair can reach $500-$1,500. If the furnace is relatively new and the repair is limited, repairing it may cost far less than replacement. For an older unit with repeated failures or a cracked heat exchanger, replacement may be the more practical budget comparison.
Two-stage operation can improve temperature consistency by running at a lower output much of the time, but energy savings depend on the existing furnace, thermostat, home insulation, and utility rates. Compare the repair quote with the full installed replacement price and the unit’s condition, not the furnace’s age alone.
Ways to lower a Lennox two-stage installation quote
Keep the project to a properly sized replacement if the existing ducts, gas connection, and vent route are safe and suitable. Avoid paying for duct replacement, premium controls, or accessories that are not needed to meet code or solve a documented comfort problem. Scheduling before peak winter demand may also make contractor availability less constrained.
Request matching quotes that list the same furnace model, capacity, warranty, permit, removal, and startup work. A lower bid may exclude necessary venting or disposal, while a higher bid may include a longer labor warranty or added modifications. Compare the complete scope and warranty terms, not just the equipment price.