Lennox furnace installation cost commonly runs $4,500-$9,500 for a standard replacement, with an average near $6,800. The final price depends on furnace capacity, efficiency, venting and duct changes, local labor rates, and whether the job replaces an existing unit or adds a new system.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Installed Lennox furnace | $4,500 | $6,800 | $9,500 | Typical gas furnace replacement |
| Furnace equipment | $1,800 | $3,300 | $5,500 | Model, efficiency, and capacity affect price |
| Installation labor | $1,200 | $2,000 | $3,500 | More for venting or duct modifications |
| Installed price per home | $45 | $68 | $95 | Approximate dollars per 1,000 sq ft; not a sizing method |
Assumptions: Existing gas furnace, standard access, typical U.S. labor, and no major duct or electrical work.
What a Lennox furnace replacement usually costs
For a straightforward replacement, homeowners often pay $4,500-$7,000 for a basic or midrange Lennox system, while high-efficiency models and more involved installations can reach $7,000-$9,500 or more. Larger homes, unusual vent routes, and premium controls can push a quote above that range.
A practical planning figure is about $6,800 for a standard replacement with ordinary installation conditions. Equipment prices alone are not comparable with installed quotes: a complete proposal typically includes removal, connections, startup, and labor. Ask whether the estimate includes tax and any required permit.
How equipment, labor, and venting shape the quote
Furnace equipment is usually the largest product expense, but labor and installation materials make up a substantial share of the total. The table shows common ranges for a replacement; overlapping ranges reflect differences in access, model, and local pricing.
| Quote item | Typical range | Pricing basis | What changes the charge |
|---|---|---|---|
| Lennox furnace | $1,800-$5,500 | Per unit | Capacity, AFUE, model tier |
| Installation labor | $1,200-$3,500 | About $75-$150 per hour | Crew size, access, job duration |
| Venting and connection materials | $250-$1,200 | Per installation | Vent type, condensate drain, gas piping |
| Removal and disposal | $150-$500 | Per old furnace | Haul distance and disposal charges |
| Permit and inspection | $50-$400 | Per job | City or county requirements |
Check that the quote separates the furnace from labor and installation materials. provides a useful labor cross-check, although contractors may quote a fixed project price rather than an hourly bill.
Which AFUE rating and BTU size change the price?
Efficiency and capacity affect both equipment price and installation requirements. A common 80% AFUE furnace may cost less than a 95%-plus AFUE condensing model, which can need PVC venting and a condensate drain. That added work can raise installation charges by roughly $300-$1,200 when existing connections are unsuitable.
Capacity is measured in BTUs per hour. Homes may need equipment from roughly 40,000 to 120,000 BTU, but square footage alone cannot determine the correct size. A load calculation should account for insulation, windows, air leakage, ceiling height, and climate.
Replacing a 60,000-BTU unit with a properly sized 80,000-BTU model can change the equipment price by several hundred dollars. An oversized furnace may cycle inefficiently, while an undersized unit may not keep the home comfortable during cold weather.
What can reduce a Lennox installation quote?
Keeping the project to a like-for-like replacement can avoid unnecessary duct, thermostat, and vent changes. If the existing system is correctly sized and in usable condition, ask the contractor to explain any proposed upgrades in writing and distinguish required code work from optional improvements.
Compare at least three written quotes using the same furnace capacity, AFUE rating, thermostat, warranty terms, and disposal scope. A lower bid may exclude a permit, condensate pump, or startup testing. Scheduling before peak winter demand may also provide more appointment options, though savings depend on contractor availability.
Controlling scope and comparing equivalent equipment are usually more reliable savings steps than selecting a furnace by sticker price alone.
How long do Lennox furnace labor and startup take?
A direct replacement often takes a two-person crew about 6-10 hours, or most of one workday. A difficult basement installation, new venting, gas-line adjustments, or duct repairs can extend the job to 1-2 days and increase labor charges.
Ask whether the estimate includes removal of the old unit, connection to the thermostat, combustion and safety checks, and homeowner instructions. A complete startup is important; the installer should verify airflow and operation rather than only confirm that the furnace turns on.
Labor cost is most predictable when the contractor has inspected the existing furnace location and connections.
How do Lennox furnace prices vary by U.S. location?
Installed prices can differ by about 10%-25% between lower-cost rural markets and high-cost metropolitan areas. Local wages, permit fees, seasonal demand, and contractor availability matter more than the Lennox name alone. Cold-weather regions may also have greater demand during winter, while local code rules can affect venting and inspection costs.
For a $6,800 estimate in a typical-cost market, a similar scope might land near $6,100-$7,500 in a lower-cost area or $7,500-$8,500 in a high-cost metro. These are planning comparisons, not fixed regional rates; confirm prices with nearby licensed contractors.
Use local quotes for a reliable budget because national ranges cannot account for each city’s labor and code requirements.
When do venting, ductwork, or permits add charges?
Replacing an older non-condensing furnace with a high-efficiency model can require new vent piping, drainage, or electrical connections. Those changes may add $300-$1,500, depending on the route and access. Minor duct sealing or transition adjustments may cost $200-$800; substantial duct repairs are priced separately and can add more.
Permit charges commonly fall between $50 and $400, but some jurisdictions require additional inspections or documentation. A gas-line change, asbestos-containing material, or difficult equipment removal can also create a separate charge. Ask the contractor to identify these items before work begins.
Written quotes should list required code upgrades separately from optional accessories and comfort controls.
What three Lennox installation quotes might include
A basic example could be a 60,000-BTU, 80% AFUE furnace replacing an accessible unit: $2,400 equipment, 8 labor hours at $100 per hour, and $700 for removal, connections, and permit, totaling about $3,900. Actual local bids may be higher depending on brand model and scope.
A midrange example might use an 80,000-BTU, 96% AFUE furnace with new PVC venting: $3,500 equipment, 10 labor hours at $110 per hour, and $1,100 for venting, disposal, and permit, for about $5,700. A premium 100,000-BTU system with a communicating thermostat and difficult access could total $8,000-$9,500.
Compare the included model and installation scope, not just the total at the bottom of each quote.