Installing a forced-air furnace and new ductwork typically costs $7,000-$18,000, with many standard projects near $11,500. The final price depends on home size, furnace fuel and efficiency, duct layout, labor rates, and whether old equipment or ducts need removal.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Furnace and ductwork installed | $7,000 | $11,500 | $18,000+ | Typical replacement or new installation; complex layouts can exceed this range |
| Forced-air furnace | $2,500 | $4,500 | $8,000 | Installed; price varies by fuel, capacity, and efficiency |
| New ductwork | $3,000 | $6,000 | $12,000+ | Whole-home installation; roughly $10-$25 per sq ft of conditioned area |
What a whole-home furnace and duct installation costs
For a 1,500- to 2,000-square-foot home with a standard gas furnace and accessible routes for ducts, a combined project often falls between $8,000 and $15,000. Smaller homes or straightforward installations may start around $7,000; large homes, difficult access, or extensive framing work can push the total above $18,000.
A typical 60,000- to 80,000-BTU gas furnace costs about $2,500-$6,000 installed. New sheet-metal or flexible ductwork commonly adds $3,000-$8,000, with higher prices for multiple floors, long runs, or custom plenums. Assumptions: U.S. midmarket labor rates, standard-grade equipment, normal access, and no major electrical or structural upgrades.
For budgeting, allow about $11,500 for a standard combined installation, then adjust for home size and duct access.
How furnace, duct, and labor charges appear on the quote
Contractor estimates may group materials and labor together, so buyers should ask for an itemized scope. The ranges below show common portions of a combined project, not guaranteed standalone charges.
| Quote component | Typical range | Pricing basis | What it covers |
|---|---|---|---|
| Furnace and controls | $2,000-$5,500 | $2,500-$6,000 installed | Standard gas furnace, thermostat, and basic controls |
| Duct materials | $1,500-$4,500 | $3-$8 per sq ft of home area | Duct runs, fittings, registers, and return-air components |
| Installation labor | $2,000-$5,000 | $75-$150 per technician-hour | Equipment setting, duct assembly, sealing, and testing |
| Permits and inspection | $100-$600 | Per project | Local mechanical permit and required inspection |
| Removal and disposal | $200-$900 | Per job | Haul-away of old furnace or existing duct sections |
Labor may be included in a fixed bid rather than billed hourly. Confirm whether the quote includes permits, startup testing, duct sealing, and removal before comparing totals.
Why furnace size and duct routing change the total
Furnace capacity should follow a heating-load calculation, not a rule based only on square footage. Many 1,500- to 2,000-square-foot homes need roughly 60,000-80,000 BTU, but insulation, climate, air leakage, and ceiling height can change that requirement. Moving up a furnace size without a load calculation may increase equipment cost and cause comfort or cycling problems.
Duct scope also matters. A home with one accessible basement or attic route can cost thousands less than a two-story house needing chases through finished walls. Adding a second return, rerouting more than 100 linear feet of duct, or replacing undersized trunks may add $500-$3,000 or more. Ask the contractor to identify duct size, approximate run length, and any walls or ceilings that must be opened.
Three installation scenarios with realistic totals
A small, single-story 1,200-square-foot home with accessible attic routing might need a 50,000- to 60,000-BTU furnace and about 800-1,000 square feet of duct coverage. At approximately $9-$16 per square foot for the duct portion, plus equipment and labor, the combined quote may be $7,000-$10,000.
A 1,800-square-foot, two-story home with a 60,000- to 80,000-BTU furnace and 1,200-1,500 square feet of duct coverage may total $10,000-$16,000. A larger 2,500-square-foot home with difficult access, longer runs, and a 90,000- to 100,000-BTU system could reach $16,000-$25,000. These examples assume standard gas equipment and no major remodeling or code corrections.
Regional labor rates can shift furnace installation quotes
Quotes in high-cost coastal metros and dense cities can run roughly 15%-30% above national midmarket pricing because of labor, permit, and access costs. Suburban markets often track close to the middle of the ranges in this article. Rural areas may be 5%-15% lower for labor, but travel charges or limited contractor availability can offset the difference.
Local conditions matter more than a broad regional label: gas-line work, required inspections, and difficulty parking or carrying equipment can change the bid. Compare at least two itemized local estimates for the same furnace capacity and duct scope.
How long the crew needs to install furnace and ducts
Replacing a furnace while retaining usable ducts may take one workday. Installing a furnace and new ductwork commonly takes two to five days, depending on access, number of floors, crew size, and whether drywall or framing must be opened. A crew of two or three technicians may spend roughly 24-60 labor-hours on a typical whole-home project.
Some contractors schedule separate visits for duct fabrication, equipment installation, and inspection. Ask whether temporary heat, debris removal, system balancing, and final airflow testing are included. A low bid that omits balancing or commissioning may leave the system noisy or unevenly heated.
Which furnace and duct upgrades add optional charges
Higher-efficiency furnaces, variable-speed blowers, zoning controls, and upgraded thermostats can increase the equipment portion by $500-$3,000 or more. New gas piping, electrical circuits, condensate drains, or chimney liner work may add $300-$2,500 each, depending on code and site conditions. These are not required on every installation.
Duct sealing or insulation may cost $500-$2,000 when existing runs are usable, while replacing them entirely is more expensive. Request separate prices for optional upgrades so necessary code work is not confused with comfort add-ons.
Ways to control the combined furnace and duct budget
Keep the project focused on verified needs. Have the contractor inspect existing ducts before approving full replacement; sound, correctly sized ducts may be retained, sealed, or insulated instead. Compare standard-efficiency equipment with higher-efficiency models using expected fuel savings and local utility rates, rather than relying on the rating alone.
Provide clear access to the furnace area and planned duct routes before work begins, and ask whether removing stored items or arranging access can reduce labor. Schedule before peak cold-weather demand when practical, and compare bids using matching furnace capacity, duct materials, permit charges, and warranty terms. A written, equivalent-scope comparison is more useful than choosing the lowest headline price.