Furnace replacement cost by size
| Size | Cost |
|---|---|
| 40,000 BTU | $4,630-$7,500 |
| 60,000 BTU | $4,840-$7,930 |
| 80,000 BTU | $5,060-$8,370 |
| 100,000 BTU | $5,280-$8,810 |
| 120,000 BTU | $5,500-$9,240 |
Installed: Gas furnace, 95-96% AFUE
Furnace replacement cost by material or type
| Type | Unit | Materials | Installed | Typical job | Lifespan |
|---|---|---|---|---|---|
| Gas furnace, 80% AFUE (single stage) | 80,000 BTU | $1,880-$3,620 | $4,360-$6,850 | $4,360-$6,850 | 15-25 years |
| Gas furnace, 95-96% AFUE | 80,000 BTU | $2,690-$5,290 | $5,060-$8,370 | $5,060-$8,370 | 15-25 years |
| Gas furnace, 96%+ 2-stage or modulating | 80,000 BTU | $3,830-$6,440 | $6,820-$10,330 | $6,820-$10,330 | 15-25 years |
| Electric furnace | 80,000 BTU | $1,090-$2,880 | $3,360-$5,820 | $3,360-$5,820 | 20-30 years |
| Propane furnace (95%) | 80,000 BTU | $2,880-$5,520 | $5,480-$8,910 | $5,480-$8,910 | 15-25 years |
| Oil furnace | 80,000 BTU | $4,020-$7,130 | $6,490-$10,330 | $6,490-$10,330 | 15-20 years |
| Gas boiler, hot water (high efficiency) | 80,000 BTU | $3,560-$6,670 | $7,090-$11,250 | $7,090-$11,250 | 15-30 years |
Materials include waste and contractor markup. 80,000 BTU furnace
Add-ons and extra work
| Addon | Unit | Installed |
|---|---|---|
| New PVC venting (when going 80% to 95%) | job | $407-$1,070 |
| Gas line work | job | $299-$881 |
| Ductwork repairs | job | $2,490-$3,510 |
| Variable-speed blower upgrade | job | $460-$1,110 |
| Smart thermostat | each | $270-$501 |
Installed price per unit
Labor rates
| Trade | Median pay | Billed rate |
|---|---|---|
| Heating, Air Conditioning, and Refrigeration Mechanics and Installers | $29.33/hr | $59-$76/hr |
Median pay: BLS May 2025. Billed rate: what a contractor charges per worker-hour, estimated at 2.0 to 2.6 times pay (insurance, payroll taxes, overhead, profit).
Permits for this kind of job typically run $70-$166 in the cities we checked (35 cities). Your city may differ. Shown separately from the price range.
Furnace size and cost by home size
| Home size (sq ft) | Climate zone 3 | Climate zone 5 | Climate zone 7 |
|---|---|---|---|
| 1000 | 40,000 BTU, $4,630-$7,500 | 60,000 BTU, $4,840-$7,930 | 60,000 BTU, $4,840-$7,930 |
| 1500 | 60,000 BTU, $4,840-$7,930 | 80,000 BTU, $5,060-$8,370 | 100,000 BTU, $5,280-$8,810 |
| 2000 | 80,000 BTU, $5,060-$8,370 | 120,000 BTU, $5,500-$9,240 | 120,000 BTU, $5,500-$9,240 |
| 2500 | 100,000 BTU, $5,280-$8,810 | 120,000 BTU, $5,500-$9,240 | 120,000 BTU, $5,500-$9,240 |
| 3000 | 120,000 BTU, $5,500-$9,240 | 120,000 BTU, $5,500-$9,240 | 120,000 BTU, $5,500-$9,240 |
Gas furnace efficiency (AFUE) and yearly gas cost
| AFUE | Gas used therms | Yearly cost |
|---|---|---|
| 80% | 675 | $998 |
| 90% | 600 | $887 |
| 95% | 568 | $841 |
| 98% | 551 | $815 |
EIA Natural Gas Monthly, Sept 2026, Table 20; U.S. DOE consumer furnace standard final rule (2023)
Federal tax credits
| Credit | Status |
|---|---|
| Energy efficient home improvement credit (25C): heat pumps, AC, furnaces, windows, insulation | Ended. Not allowed for property placed in service after December 31, 2025. |
| Residential clean energy credit (25D): solar, batteries, geothermal | Ended. Not allowed for expenditures made after December 31, 2025. |
Many competitor pages still show prices 'after the 30% tax credit'. That credit is gone for 2026 projects.
Some states run federally funded Home Energy Rebates (HEAR and HOMES) for heat pumps, insulation and electrical upgrades. Which states are open changes month to month, and a May 2026 DOE notice removed the fuel-switching allowance. Link each state page to the state energy office rather than stating amounts.
Lifespan and upkeep by material
| Material | Lifespan | Upkeep | Every | Upkeep per year |
|---|---|---|---|---|
| Gas furnace | 15-25 years | Yearly tune-up and filter changes | 1 years | $100-$250 |
| Heat exchanger | 10-15 years | Checked during tune-up | 1 years | $0-$0 |
Lifespans: InterNACHI and manufacturer data. Upkeep costs: NumeralQ estimates.
Furnace replacement cost by state
| State | Typical job | Vs national |
|---|---|---|
| Alabama | $4,570-$7,730 | -8% |
| Alaska | $5,700-$9,200 | +11% |
| Arizona | $5,000-$8,290 | -1% |
| Arkansas | $4,560-$7,720 | -9% |
| California | $5,510-$8,950 | +8% |
| Colorado | $5,220-$8,580 | +3% |
| Connecticut | $5,670-$9,160 | +10% |
| Delaware | $5,110-$8,440 | +1% |
| District of Columbia | $5,970-$9,550 | +16% |
| Florida | $4,890-$8,150 | -3% |
| Georgia | $4,880-$8,140 | -3% |
| Hawaii | $5,230-$8,600 | +3% |
| Idaho | $4,880-$8,130 | -3% |
| Illinois | $5,700-$9,200 | +11% |
| Indiana | $5,040-$8,340 | -0% |
| Iowa | $5,050-$8,350 | -0% |
| Kansas | $5,040-$8,340 | -0% |
| Kentucky | $4,970-$8,250 | -2% |
| Louisiana | $4,970-$8,250 | -2% |
| Maine | $5,150-$8,480 | +2% |
| Maryland | $5,410-$8,830 | +6% |
| Massachusetts | $5,690-$9,190 | +11% |
| Michigan | $5,060-$8,360 | -0% |
| Minnesota | $5,660-$9,150 | +10% |
| Mississippi | $4,580-$7,750 | -8% |
| Missouri | $5,020-$8,320 | -1% |
| Montana | $5,060-$8,360 | -0% |
| Nebraska | $5,020-$8,310 | -1% |
| Nevada | $5,040-$8,350 | -0% |
| New Hampshire | $5,560-$9,020 | +9% |
| New Jersey | $5,580-$9,050 | +9% |
| New Mexico | $4,640-$7,830 | -7% |
| New York | $5,580-$9,050 | +9% |
| North Carolina | $4,920-$8,180 | -2% |
| North Dakota | $5,590-$9,050 | +9% |
| Ohio | $5,120-$8,450 | +1% |
| Oklahoma | $4,930-$8,200 | -2% |
| Oregon | $5,140-$8,470 | +1% |
| Pennsylvania | $5,120-$8,440 | +1% |
| Rhode Island | $5,310-$8,690 | +4% |
| South Carolina | $4,890-$8,150 | -3% |
| South Dakota | $5,080-$8,390 | +0% |
| Tennessee | $4,850-$8,090 | -4% |
| Texas | $4,940-$8,210 | -2% |
| Utah | $4,970-$8,260 | -2% |
| Vermont | $5,110-$8,430 | +1% |
| Virginia | $5,010-$8,310 | -1% |
| Washington | $5,630-$9,110 | +10% |
| West Virginia | $4,590-$7,760 | -8% |
| Wisconsin | $5,090-$8,410 | +0% |
| Wyoming | $4,820-$8,050 | -4% |
80,000 BTU furnace
Sources
- NumeralQ estimator (pricing as of 2026-10-26)
- Fixr cost guide, retrieved 2026-10-26
- Home Depot online prices, store 121, retrieved 2026-10-26
- NumeralQ estimate (no single published range; set from material prices and typical install hours)
- This Old House cost guide, retrieved 2026-10-26
- U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics, May 2025 (https://www.bls.gov/oes/)
- City permit fee schedules, retrieved October 2026 (see the permit line for this page's source)
- NumeralQ pricing model v2: materials plus local labor, methodology at /methodology
How Much Does Furnace Replacement Cost?
These are model values, not national transaction averages or contractor bids.
AFUE describes a furnace’s fuel-use efficiency rating; it does not determine a home’s bill savings or project payback by itself. Those depend on equipment, heating load, fuel rates, use, installation, and project cost. The cited ACEEE study concerns variable-speed blower electricity use, not AFUE fuel savings.
Furnace Replacement Cost by Type
Emergency scheduling and equipment availability vary by market, season, and project. When safe, compare written proposals and confirm timing and scope directly with contractors.
80% vs. 95%+ AFUE: Is High Efficiency Worth It?
Warning Signs Your Furnace Needs Replacement
- System condition, service history, safety, repair scope, and a written replacement proposal
- Cracked heat exchanger — CO safety emergency, replacement required immediately
- Repair and replacement proposals should be compared for the specific equipment and scope
- Frequent repairs (more than once per heating season)
- Inconsistent heating or cold spots between rooms and floors
- Yellow or flickering flame (should be steady blue for gas furnaces)
- Carbon monoxide detector alarms or occupants experiencing headaches/nausea
- Energy bills rising significantly without explanation
Frequently Asked Questions
Should I replace the furnace alone or the whole system?
Whether to replace a furnace alone or consider the air conditioner too depends on the condition, compatibility, warranty, and repair history of both systems. Ask the contractor to assess each system and itemize the options.
What is a cracked heat exchanger and why is it dangerous?
The heat exchanger is the metal barrier between combustion gases and the air circulated through your home. A crack allows carbon monoxide — a colorless, odorless gas — to enter the living space. This is a safety emergency: shut down the furnace, ventilate the home, and arrange immediate replacement. A cracked heat exchanger is not repairable. This condition is diagnosed during annual HVAC tune-ups, which is why annual service is essential.
How long does furnace replacement take?
Installation and scheduling depend on equipment, venting, permits, season, and contractor availability. Request a property-specific work plan and schedule.
Source: Scott Pigg and Tom Talerico, “Electricity Savings from Variable-Speed Furnaces in Cold Climates,” ACEEE 2004. Field monitoring covered 31 new Wisconsin furnaces during 2001–2002: 14 ECM variable-speed, 16 single-stage non-ECM, and one two-stage non-ECM. Accessed October 2, 2026.
How the Furnace Replacement Estimate Works
The estimate uses the selected project scope, the selected material or project option, additional project details only when this service model supports an adjustment and the ZIP code to identify supported local-market context.
Only factors supported by this service model change the planning range. Other project details may help with context or follow-up without changing the estimate. NumeralQ planning estimates are not contractor quotes or records of completed transactions.