Gravity furnace replacement cost commonly runs $6,000-$14,000 for a standard home, with a national planning average near $9,500. The final quote depends on furnace capacity, removal of the old unit, whether existing ducts can be reused, local labor rates, and any asbestos or venting work.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Complete replacement | $6,000 | $9,500 | $14,000 | New gas furnace, removal, and basic connections |
| Furnace equipment | $2,000 | $3,500 | $5,500 | Residential unit, typically 60,000-100,000 BTU |
| Installation labor | $1,500 | $2,700 | $4,500 | Higher when access or vent changes are needed |
| Old furnace removal | $500 | $1,000 | $2,000 | More if disposal or hazardous-material controls apply |
| Duct repairs or changes | $500 | $1,500 | $4,000 | Reuse is less costly than extensive replacement |
Gravity furnace replacement price for a typical home
Most homeowners pay $6,000-$14,000 to remove a large, older gravity furnace and install a modern heating system. A straightforward gas-furnace replacement with usable ducts and a nearby vent may fall near $6,000-$9,000. Homes needing substantial duct conversion, new venting, electrical work, or hazardous-material abatement can reach $12,000-$20,000 or more.
A reasonable planning budget is about $9,500 for a mid-range conversion with standard access and limited duct repairs. That estimate assumes a roughly 1,500-2,000-square-foot home, a properly sized furnace, ordinary Midwest labor rates, and no major structural changes. Larger houses and high-cost metro areas can exceed the range.
Gravity furnaces heat air without a blower, relying on natural circulation through large ducts. Their replacement is therefore not always a simple equipment swap: a contractor may need to adapt the distribution system to work with a blower-driven furnace. Ask whether the quote includes duct transitions, return-air work, thermostat wiring, startup testing, and disposal.
Assumptions: Standard-efficiency gas furnace, normal access, existing gas service, and ducts that need only modest modification.
What furnace removal, equipment, and ductwork add
A complete quote combines equipment, labor, removal, and any system changes. The ranges below are typical U.S. planning figures, not fixed national rates. A contractor’s scope and local code requirements determine which items apply.
| Quote component | Typical price | Common basis | What changes the charge |
|---|---|---|---|
| Furnace and controls | $2,000-$5,500 | One 60,000-100,000 BTU unit | Capacity, efficiency, brand, and warranty |
| Installation labor | $1,500-$4,500 | 2-3 technicians for 1-2 days | Access, conversion work, and vent route |
| Removal and disposal | $500-$2,000 | One existing furnace | Weight, stairs, dismantling, and disposal rules |
| Duct transitions and repairs | $500-$4,000 | Limited alterations to broad replacement | Number of runs and return-air configuration |
| Permits and inspection | $100-$600 | Local mechanical permit | City fees and required inspections |
| Venting, gas, or electrical changes | $300-$2,500 | Small connection changes | Chimney liner, gas pipe, outlet, or condensate drain |
Equipment is only one part of the quote; conversion labor and duct compatibility can add several thousand dollars. Furnace prices usually include the unit and basic controls, but not always disposal, permits, or substantial ductwork. Compare itemized estimates rather than relying on a single “installed” price.
Installation labor can be estimated with . HVAC technicians commonly bill or price work at an effective $75-$150 per hour, although many companies quote the full job rather than an hourly total. Crew time may run 16-32 labor-hours for a routine conversion, with additional time for difficult removal or duct changes.
How home size and duct condition change the quote
Furnace capacity should follow a load calculation, not just the size of the old gravity furnace. Many 1,200-1,800-square-foot homes need roughly 40,000-80,000 BTU per hour, while a larger or poorly insulated 2,000-2,800-square-foot home may require 80,000-120,000 BTU. Climate, insulation, windows, air leakage, and ceiling height all affect the result.
Oversizing the new furnace can raise the equipment price and cause short cycling, so a documented load calculation is worth requesting. A capacity increase from 60,000 to 100,000 BTU may add roughly $300-$1,000 for equipment, but it can also require larger gas piping, venting, or duct modifications. These related changes can have a greater effect than the furnace price alone.
Duct condition is a major conversion variable. Gravity systems may have large, low-pressure ducts that are suitable for a blower after inspection, but some need new return-air paths or transitions. A small repair or transition can cost $500-$1,500; replacing or substantially rebuilding ducts may cost $2,000-$6,000, depending on access, number of floors, and material.
Ask the contractor to check duct leakage, airflow, return capacity, and static pressure. A furnace that produces heat but cannot move it through the existing system may be noisy, inefficient, or unable to keep rooms comfortable. A second return or several repaired runs can be less expensive than full duct replacement if the rest of the system is sound.
Ways to reduce a gravity furnace replacement bill
Scope control is usually more effective than choosing the cheapest furnace available. Request a written base quote that reuses serviceable ducts, then separate optional upgrades from required safety or code work. Have the contractor identify which changes are necessary for safe operation, which improve comfort, and which are elective.
Preserving sound ductwork and avoiding unnecessary capacity upgrades can keep a conversion near the lower end of the range. Do not accept a larger furnace solely because the old one was large; ask for the load calculation and proposed airflow. If a few damaged runs or one return are the issue, compare a targeted repair with complete replacement.
Get at least three itemized bids based on the same furnace capacity, efficiency, removal scope, and duct assumptions. Check whether each quote includes permit fees, thermostat, venting, start-up testing, warranty, and hauling. A low bid that excludes disposal or duct adjustments may not be cheaper after change orders.
Homeowners can reduce billable preparation time by clearing a path to the furnace, moving stored items, and identifying shutoff locations. They should not disconnect gas, dismantle the furnace, or disturb suspected asbestos. Scheduling during a less busy period may make appointment times easier to secure, but discounts vary by contractor and region.
How regional labor shifts furnace replacement estimates
Location changes the price through wages, permit fees, travel, and contractor demand. For a comparable gas-furnace conversion with limited ductwork, a rural or lower-cost market may run about 10%-20% below a national midpoint. A high-cost metro area or region with tight technician availability can be 15%-30% above it.
Labor and site conditions often explain regional differences more than the furnace model itself. A $9,500 mid-range project might cost roughly $7,600-$8,600 in a lower-cost area, versus $10,900-$12,400 in an expensive metro. These are broad comparisons; local permit rules and the condition of the house can outweigh the regional average.
Cold-weather markets may have more complex venting, winter scheduling pressure, or older housing stock with duct and chimney issues. In milder regions, labor may be less constrained during heating season, though local gas availability and contractor competition still matter. Obtain local bids with the same specifications before treating any online estimate as a firm budget.
How long removal and installation take
A routine replacement often takes one to two working days. A crew of two or three may spend 6-10 hours removing the old unit, setting the new furnace, connecting services, and testing the system. A difficult basement removal, long chimney connection, or multi-floor duct conversion can extend the job to two or three days.
Longer work time usually signals added scope, not simply a higher hourly rate. Before work starts, ask how the contractor will protect floors and walls, handle the heavy furnace, dispose of debris, and keep the home heated if the work spans multiple days. Verify whether the estimate includes a final combustion and airflow check.
Removal charges may be higher when the furnace must be cut into sections to pass through narrow access, or when the crew must carry it up stairs. If the old unit is connected to a masonry chimney, the contractor may recommend a liner or a different venting arrangement. Request the reason and price for each change in writing.
When ductless heat or repair costs less
Repairing a gravity furnace can appear cheaper, but the decision depends on age, safety, and remaining life. A minor repair such as a control or pilot-related service may cost $150-$700; a major heat-exchanger or structural repair can cost $1,000-$3,000 or more and may not be sensible for an old, inefficient system. A technician should inspect the unit before comparing repair with replacement.
Repair makes the strongest financial case when the furnace is safe, the fault is limited, and the rest of the system is in good condition. Replacement is more compelling when parts are unavailable, repairs recur, or combustion and venting problems create safety concerns. Cost alone should not override a professional carbon-monoxide and combustion assessment.
A ductless mini-split is another option when the existing ducts are unusable or the home needs room-by-room zoning. A single-zone installed system commonly costs $3,000-$7,000; a multi-zone setup can run $8,000-$18,000 or more. That price is not directly equivalent to a furnace replacement because coverage, backup heat, electrical work, and the number of indoor units differ.
Electric resistance heaters have lower installation costs in some situations, but may have higher operating expenses in cold climates. Compare the full scope and expected utility use, rather than equipment sticker prices alone. A contractor can also price a heat pump with backup heat where climate and existing electrical service make it practical.
What removal, asbestos, and venting can add
Older gravity furnaces may have insulation, duct wrap, or flue materials that require testing before disturbance. Suspected asbestos should be assessed by qualified professionals; sampling and abatement are not ordinary furnace-removal tasks. Testing can cost about $250-$800, while contained abatement may add $1,000-$5,000 or more depending on material quantity, access, and local rules.
Do not assume asbestos is present, but do not let an installer disturb suspect material without an appropriate assessment. Ask whether the bid excludes testing or abatement and who is responsible for coordinating it. Abatement work may require a separate contractor and can delay installation.
Venting can also change the budget. A new gas furnace may use a chimney liner, a different flue connector, or sealed PVC venting depending on equipment type and local code. Basic vent modifications may cost $300-$1,000; a new liner or difficult route can push the charge to $1,000-$2,500. Gas-pipe changes, condensate drainage, and electrical upgrades may be additional.
Local permits commonly add $100-$600, although some jurisdictions charge more or require additional inspections. The contractor should identify the permit holder, inspection fee, and any code-related work in the written scope. Rebates and utility incentives vary by location and equipment eligibility, so confirm current terms directly with the utility before counting them against the budget.