A Lennox 96% efficient furnace typically costs $4,500-$9,500 installed, with many standard replacements near $6,500. The final price depends on furnace capacity and model, venting and ductwork changes, local labor rates, and whether the job includes removal or other upgrades.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Installed furnace replacement | $4,500 | $6,500 | $9,500 | Standard residential changeout |
| Furnace equipment only | $2,500 | $3,800 | $5,500 | Model, capacity, and dealer pricing vary |
| Installation labor | $1,200 | $2,000 | $3,500 | More for venting or system changes |
| Typical capacity | 40,000 BTU | 80,000 BTU | 120,000 BTU | Correct sizing requires a heat-loss calculation |
What a Lennox 96% furnace costs installed
For a straightforward replacement in an existing home, a Lennox high-efficiency furnace commonly falls between $4,500 and $9,500 installed. A basic single-stage model with compatible connections tends toward the lower end; a larger or more advanced unit, difficult access, or substantial venting work raises the total.
A practical planning figure is about $6,500 for equipment and standard installation. This estimate assumes an existing gas furnace, standard-quality materials, no major duct repairs, and typical suburban labor rates. A new furnace paired with a thermostat or substantial code work may cost more.
Assumptions: U.S. residential installation, existing gas service, standard access, and no major duct replacement.
How equipment, labor, and venting shape the quote
A quote may combine the furnace, installation, and several job-specific charges. Ask whether the price includes the thermostat, condensate drain, startup testing, and disposal of the old unit; exclusions can make an apparently low bid less comparable.
| Quote component | Typical price | What can change it |
|---|---|---|
| Lennox furnace | $2,500-$5,500 | Capacity, model features, and dealer markup |
| Labor and setup | $1,200-$3,500 | Access, wiring, and installation complexity |
| Venting and condensate materials | $250-$1,200 | Pipe length, routing, drain location |
| Removal and disposal | $100-$400 | Hauling distance and local disposal charges |
| Permit and inspection | $50-$500 | Municipal fee and inspection requirements |
Confirm that labor, venting, disposal, and startup are itemized rather than assumed. A two-person crew working 6-10 hours at an effective $75-$150 per labor hour can account for roughly $900-$3,000 before materials and overhead.
How BTU capacity and PVC vent length change price
Capacity affects equipment cost, but a larger furnace is not automatically better. Common residential sizes span roughly 40,000-120,000 BTU; a higher-capacity unit can add several hundred dollars or more, depending on model and configuration. A contractor should size the furnace to the home’s heat loss, not simply match the old unit.
Because a 96% AFUE furnace produces condensate and uses high-efficiency venting, installation may require suitable PVC or other approved vent pipe and a drain. A short, accessible vent route may cost a few hundred dollars in materials, while a route extended 20-40 feet through finished space or around obstacles can add $500-$1,500 or more.
Existing vent compatibility and correct sizing are two of the biggest quote swing points. Ductwork that is undersized, leaking, or poorly balanced can also require repairs, commonly adding $300-$2,000 depending on the work.
Can a simple furnace swap stay near the lower price?
Often, but only when the new Lennox unit is compatible with the existing gas line, electrical connections, vent route, condensate drain, and duct system. A direct replacement with ordinary access may take a crew about 6-10 hours and keep labor near $1,200-$2,000. Relocating the furnace, rebuilding venting, or correcting code issues can extend the job to a full day or longer.
“Furnace replacement” should not be taken to mean identical scope across bids. Request the planned work, crew size, labor warranty, commissioning steps, and any exclusions in writing; those details explain why two quotes can differ by thousands of dollars.
How Lennox pricing compares with furnace-only and full-system bids
Equipment-only prices are not directly comparable with installed quotes. A Lennox furnace priced at $2,500-$5,500 may still need labor, venting, permits, removal, and startup. A complete installed bid of $4,500-$9,500 covers more, but the exact inclusions matter.
Replacing a furnace and air conditioner together can raise the project total substantially, often into the $8,000-$16,000 range depending on cooling capacity and equipment. Bundling can reduce duplicated labor, but it is not a reason to replace a working air conditioner without comparing its condition, age, and repair needs.
Compare installed scope and warranty, not just the furnace’s advertised equipment price. A lower-priced model may also have different staging, blower, or control features than a higher-tier Lennox option.
Why regional labor rates move Lennox installation totals
Local labor availability, permitting, and climate-driven demand affect furnace quotes. Large metropolitan markets and high-cost coastal areas can run about 10%-25% above a typical national estimate, while some lower-cost rural markets may come in 5%-15% below it. These are broad comparisons, not guaranteed regional prices.
Cold-weather markets may see tighter appointment availability before and during winter, while mild-climate areas can have different seasonal demand. Get at least two itemized local quotes for the same model and installation scope. Check whether each includes tax, permit, removal, and required venting work.
What venting, permits, and old-furnace removal add
Common extra charges include $100-$400 for removal, $50-$500 for permits and inspections, and $250-$1,200 for routine vent or condensate materials. If a new drain route, electrical circuit, gas-line adjustment, or duct repair is needed, the contractor may price it separately. Local code requirements can also call for additional safety or combustion-air work.
Ask the installer to identify allowances and possible change orders before work begins. A quote that says “venting included” should specify whether that means reuse of the existing route or replacement and extension of the pipe.
Ways to control the Lennox furnace replacement budget
Keep the scope focused on a properly sized furnace and necessary code or safety corrections. Have contractors evaluate the existing vent and ductwork before choosing a model, and avoid paying for duct replacement or accessories without a documented need. Scheduling outside peak heating emergencies may also make it easier to compare available bids.
Use identical model numbers and written scopes when comparing estimates. Check warranty terms, labor coverage, thermostat inclusion, startup testing, and disposal. If the old system has a repairable problem and is not near the end of its service life, compare a repair quote with full replacement rather than assuming a new furnace is the lower-cost choice.