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Furnace Replacement Cost Calculator
Price a 2026 furnace replacement by home size, fuel type, AFUE tier, and ductwork scope — then line up 3 licensed HVAC contractor quotes.
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What You'll Need
Filtrete 16x25x4 Air Filter, MERV 11, MPR 1000, 2 HVAC Filters
$18.02
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Filtrete 16x25x1 Air Filter, MERV 11, MPR 1000, Allergens & Pet Dander, 3-Month AC and Furnace Filters, Cleaner Air, Reliable Airflow, 4 HVAC Filters (Actual Size 15.68 x 24.68 x 0.81 in)
$43.98
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Amazon Basics 16x20x1 Air Filter 6-Pack, MERV 8 AC Furnace Filters, Allergy Control, Removes Dust, Lint and Pollen, Electrostatic (Actual Size: 15.75" x 19.75" x 0.75")
$27.85
View on AmazonFiltrete 16x25x4 Air Filter, MERV 11, MPR 1000, 2 HVAC Filters
$18.02
View on AmazonFiltrete 16x25x1 Air Filter, MERV 11, MPR 1000, Allergens & Pet Dander, 3-Month AC and Furnace Filters, Cleaner Air, Reliable Airflow, 4 HVAC Filters (Actual Size 15.68 x 24.68 x 0.81 in)
$43.98
View on AmazonAmazon Basics 16x20x1 Air Filter 6-Pack, MERV 8 AC Furnace Filters, Allergy Control, Removes Dust, Lint and Pollen, Electrostatic (Actual Size: 15.75" x 19.75" x 0.75")
$27.85
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Price as of Jul 24, 2026. Product prices and availability are accurate as of the date indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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Frequently Asked Questions
QHow much does a furnace replacement cost in 2026?
Typical whole-home furnace replacement runs $4,000-$12,000 installed in 2026, with the national average near $4,800 and most homeowners paying $2,800-$7,500. Gas furnaces run $3,800-$12,000, electric $2,000-$7,000, and oil $4,000-$10,000+. A 2,000 sqft home in a cold climate upgrading to a 95%+ AFUE condensing unit with ductwork adjustments typically lands $7,500-$10,500. Old-unit removal adds $300-$1,200 as its own line item, and PVC venting plus condensate drain for condensing upgrades adds $500-$1,500 more.
- Typical replacement range: $4,000-$12,000
- National average: $4,800 installed
- Gas $3,800-$12,000; electric $2,000-$7,000; oil $4,000-$10,000+
- Old-unit removal: $300-$1,200 line item
- 95%+ AFUE upcharge: $1,500-$3,000 over 80% baseline
| Home size | Cold-climate BTU | Replacement cost | Removal line item |
|---|---|---|---|
| Under 1,000 sqft | 40k-60k BTU | $2,500-$5,000 | $300-$500 |
| 1,000-1,500 sqft | 50k-80k BTU | $3,500-$7,000 | $300-$700 |
| 1,500-2,000 sqft | 70k-90k BTU | $4,500-$8,500 | $400-$900 |
| 2,000-2,500 sqft | 80k-100k BTU | $6,000-$10,500 | $500-$1,000 |
| 2,500+ sqft / multi-story | 100k+ BTU | $8,500-$14,000+ | $700-$1,200 |
QHow much does it cost to remove the old furnace on a replacement?
Old-unit removal is usually $300-$1,200 as a separate line item on the bid. A small gas hot-air furnace removed from a basement runs $300-$500; a large gas forced-air unit $500-$800; a cast-iron gravity furnace takes disassembly and runs up to $1,200; and an oil furnace with tank pulls $600-$1,200 because of hazmat handling. Dumping fees add $60-$330 depending on regional disposal rates and scrap-metal recycling credits. Attic or crawl-space removal adds 20-40% labor over basement access.
- Small gas hot-air removal: $300-$500
- Large gas forced-air: $500-$800
- Cast-iron gravity: up to $1,200
- Oil furnace + tank: $600-$1,200
- Dumping fees: $60-$330 per home
| Old unit type | Removal cost | Dumping fee | Access note |
|---|---|---|---|
| Small gas hot-air | $300-$500 | $60-$150 | Basement |
| Large gas forced-air | $500-$800 | $100-$250 | Attic +20-40% |
| Cast-iron gravity | $1,000-$1,200 | $150-$300 | Dismantle |
| Oil furnace + tank | $600-$1,200 | $300-$750 | Hazmat |
QDo I need ductwork modifications when I replace a furnace?
Often yes, especially when the new unit has different cabinet dimensions or higher CFM demand. Light ductwork modification for plenum transitions runs $500-$2,500; heavy retrofit or partial replacement $2,000-$7,000; and a full system replacement with new ductwork $7,000-$16,000 (national average $11,590-$14,100 for 2,000-2,500 sqft). Upgrading from an 80% AFUE unit to 95%+ condensing requires PVC venting plus a condensate drain line ($500-$1,500) and an outside air intake ($200-$500) that the original metal flue could not handle.
- Light ductwork mod (plenum transition): $500-$2,500
- Heavy retrofit: $2,000-$7,000
- Full ductwork replacement: $7,000-$16,000
- PVC venting for condensing: +$500-$1,500
- Outside air intake: +$200-$500
QIs the 80% AFUE furnace still allowed in 2026?
Yes nationally, but code is tightening fast. The federal DOE rule raises the residential minimum to 95% AFUE starting December 2028, and Colorado House Bill 23-1161 already requires 95%+ AFUE plus Ultra-Low NOx emissions (14 ng/J cap) statewide by Dec 2028. California AQMDs have active NOx caps in some districts. A 95% AFUE unit saves roughly $500 per year vs an 80% unit in cold climates, paying back the $1,500-$3,000 upcharge in 4-7 years. For homes planning to stay 5+ years, upgrading now is cheaper than replacing again in 2028.
- 80% AFUE still legal nationally in 2026
- DOE minimum rises to 95% AFUE Dec 2028
- Colorado 95%+ AFUE + 14 ng/J NOx by Dec 2028
- 95% AFUE saves ~$500/year vs 80% (cold climate)
- Payback on upgrade: 4-7 years
| AFUE tier | 80k BTU install | Annual fuel savings vs 80% | 2026 federal credit |
|---|---|---|---|
| 80% AFUE standard | $3,800-$6,500 | Baseline | Expired |
| 90% AFUE high-eff | $5,000-$8,000 | 12-15% | Expired |
| 95%+ AFUE condensing | $6,000-$10,500 | 18-22% | Expired Dec 31 2025 |
| 97%+ AFUE ultra | $7,500-$12,000 | 20-25% | Expired |
QAre there still federal tax credits for furnace replacement in 2026?
No. The federal Energy Efficient Home Improvement Credit (Section 25C) expired December 31, 2025 under the One Big Beautiful Bill Act signed July 4, 2025. HVAC equipment installed in 2026 does NOT qualify for the former 30%-up-to-$600 federal credit. State and utility rebates remain, typically $100-$500 for qualifying 95%+ AFUE units, and can be verified via DSIRE.org. Heat pump installations may still carry state-level rebates and could be a better 2026 play given electrification incentives that outlive the furnace credit.
- Federal 25C credit EXPIRED Dec 31 2025
- No new federal HVAC credit in 2026
- Utility rebates: $100-$500 typical
- State rebates: check DSIRE.org
- Heat pump path may retain more incentives
QWhat are the red flags when hiring a furnace replacement contractor?
Reject any contractor who quotes within minutes without inspecting your existing system or running a Manual J load calc, demands more than 25-30% deposit upfront, pressures you with 'same-day emergency replacement' claims, refuses to itemize old-unit removal or permit as separate lines, or will not produce license + bonding + insurance certificates. October-November is peak scare-tactic season because demand spikes and homeowners scramble. Get at least 3 written quotes; a fair spread on identical scope runs 20-40%. Bids 20%+ below the pack typically hide missing removal, venting, or Manual J scope.
- Minimum 3 written quotes required
- Deposit cap: 25-30% of contract
- Demand Manual J load calc before sizing
- Demand combustion-analyzer reading before condemnation
- HVAC + gas-fitting license verified
Example Calculations
11,800 sqft gas furnace replacement, 90% AFUE, reused ducts, Midwest
Inputs
Home size1,500-2,000 sqft
Fuel typeNatural gas
AFUE tier90% high-efficiency
DuctworkReuse existing
RegionMidwest
Result
Typical replacement quote$5,000 – $7,500
Furnace unit (90% AFUE, 80k BTU)~$3,200
Install labor~$2,000
Old-unit removal~$500
Permit + thermostat~$400
22,200 sqft 95%+ AFUE condensing retrofit, light ductwork mod, Northeast
Inputs
Home size2,000-2,500 sqft
Fuel typeNatural gas
AFUE tier95%+ condensing
DuctworkLight plenum transition
RegionNortheast
Result
Typical replacement quote$9,500 – $13,000
Furnace unit (95% AFUE, 100k BTU)~$4,800
Install labor + PVC venting~$3,500
Light ductwork modification~$1,500
Old-unit removal~$800
Permit + condensate pump~$700
31,200 sqft electric furnace replacement, reused ducts, South
Inputs
Home size1,000-1,500 sqft
Fuel typeElectric
AFUE tierN/A (resistance)
DuctworkReuse existing
RegionSouth
Result
Typical replacement quote$2,800 – $4,800
Electric furnace unit (60k BTU)~$1,800
Install labor + electrical~$1,400
Old-unit removal~$350
Formulas Used
Furnace replacement cost breakdown
Quote = Furnace Unit + Labor + Old-Unit Removal + Ductwork Modification + Venting Upgrade + Permit + Regional AdjustmentReplacement quotes stack the standard install components on top of old-unit removal ($300-$1,200) and, when upgrading efficiency, ductwork modifications ($500-$7,000) plus PVC venting ($500-$1,500). The furnace unit itself is 50-75% of total project cost; labor 20-30%; removal 5-10%; permits, venting, and thermostat fill the remaining 5-15%. Regional labor adjustments add 20-40% in Northeast and West Coast markets.
Where:
Furnace Unit= 50-75% of total; $1,500-$6,000 depending on fuel + AFUELabor= 20-30% of total; $50-$100/hr installer + up to $50/hr helperOld-Unit Removal= $300-$1,200 line item; cast iron + oil units upper endDuctwork Modification= $500-$2,500 light / $2,000-$7,000 heavy / $7,000-$16,000 full replaceVenting Upgrade= $500-$1,500 PVC + condensate drain for 95%+ AFUE condensingRegional= Northeast + West Coast +20-40% over national averageFurnace Replacement Costs in 2026: What Homeowners Actually Pay
1
2026 Furnace Replacement Cost: What Homeowners Actually Pay
Full whole-home furnace replacement in 2026 runs $4,000-$12,000 for most homeowners with the national average installed cost near $4,800, and the typical band is $2,800-$7,500. The specific total your project lands in is driven primarily by fuel type, followed by home size, AFUE tier, and the scope of any ductwork modifications required to fit the new unit. Gas furnaces run $3,800-$12,000, electric $2,000-$7,000, and oil $4,000-$10,000+, with fuel choice usually constrained by what is already piped into the home.
A 2,000 square foot home is the most common replacement profile in the US. In a warm climate with a 60,000 BTU gas unit the bill lands $2,500-$4,200; in a cold climate with a 120,000 BTU unit needing 95%+ AFUE efficiency the same home runs $4,000-$6,000 before ductwork adjustments. The furnace unit itself absorbs 50-75% of total project cost, installation labor takes 20-30%, and the remaining 5-15% covers old-unit removal, venting, permits, and the thermostat. Installer labor bills at $50-$100 per hour with helper time up to $50/hour more, and a typical replacement takes 8-14 hours on-site.
Furnace replacement costs are consistently higher than install-only scopes because three line items appear on replacements that do not exist in a new-build install: demolition labor for the old unit, haul-off and disposal fees, and often venting transition work when AFUE tier changes. If you are pricing a fresh install without an existing unit to remove, the install-only baseline is tracked separately on our furnace install cost calculator. Buyers planning a full system swap should also price the AC side against our central AC install cost calculator, because bundled replacements typically save 10-15% over two separate projects.
| Home size | Cold-climate BTU | Typical replacement cost | Old-unit removal |
|---|---|---|---|
| Under 1,000 sqft | 40k-60k BTU | $2,500-$5,000 | $300-$500 |
| 1,000-1,500 sqft | 50k-80k BTU | $3,500-$7,000 | $300-$700 |
| 1,500-2,000 sqft | 70k-90k BTU | $4,500-$8,500 | $400-$900 |
| 2,000-2,500 sqft | 80k-100k BTU | $6,000-$10,500 | $500-$1,000 |
| 2,500+ sqft / multi-story | 100k+ BTU | $8,500-$14,000+ | $700-$1,200 |
2
Why Replacement Costs More Than Install-Only: Old-Unit Removal and Disposal
The single biggest reason a furnace replacement bid outprices a new install is the old-unit tear-out. A small gas hot-air furnace in a basement runs $300-$500 to disconnect, haul upstairs, and load onto the disposal truck. A large gas forced-air unit $500-$800. A cast-iron gravity furnace, which has to be disassembled in place before it can fit through a basement door, runs up to $1,200 just for removal labor. Oil furnaces with underground or above-ground tanks add $600-$1,200 because of hazmat handling requirements and environmental reporting on residual fuel.
Access is the second multiplier that changes the removal line item significantly. Attic furnace removal adds 20-40% labor over basement access because crews hand-carry segments down ladders or stairs, and crawl-space units sometimes require cutting a temporary access panel that gets patched later. Disposal fees beyond labor run $60-$330 per home depending on local dumping rates, scrap-metal recycling credits on the old heat exchanger, and refrigerant recovery if the furnace was part of an integrated system. A clean removal line on your bid covers labor plus disposal plus any required environmental reporting.
A useful rule when reviewing quotes: old-unit removal should appear as its own line item, not rolled into labor or hidden inside the furnace unit price. When a bid buries removal it becomes impossible to compare against a second bid that breaks it out, and buyers end up effectively comparing different scopes. Ask every contractor to price removal separately. Bids that refuse usually hide other missing scope too, most commonly venting transition or ductwork adjustments. For homes also swapping ductwork during the replacement, cross-check scope with our ductwork replacement cost calculator so both line items stay aligned.
Demand old-unit removal as a separate line item on every bid. Bids that roll removal into labor block apples-to-apples comparison and usually hide other missing scope like venting or ductwork modification.
- Small gas hot-air removal: $300-$500
- Large gas forced-air: $500-$800
- Cast-iron gravity: $1,000-$1,200 (dismantle in place)
- Oil furnace + tank: $600-$1,200 (hazmat handling)
- Attic or crawl-space access: +20-40% labor
- Dumping fees: $60-$330 per home
3
AFUE 80 vs 90 vs 95%+ on Replacement: Code Pressure Tightens in 2028
AFUE (Annual Fuel Utilization Efficiency) measures what fraction of your fuel becomes usable heat, and it is the efficiency metric stamped on every furnace sold in the US. An 80% AFUE unit turns 80 cents of every fuel dollar into heat; a 95%+ AFUE condensing unit hits 95 cents. In 2026 an 80% AFUE unit installed is $3,800-$6,500, a 90% high-efficiency unit is $5,000-$8,000, and a 95%+ AFUE condensing unit is $6,000-$10,500 on a baseline 80,000 BTU gas replacement. The upcharge from 80% to 95%+ AFUE runs $1,500-$3,000 on the unit itself plus $500-$1,500 for the required PVC venting and condensate drain.
The 80% AFUE option is still legal nationally in 2026, but the regulatory clock is running. The federal Department of Energy rule raises the residential minimum AFUE to 95% effective December 2028, and Colorado House Bill 23-1161 already requires 95%+ AFUE plus an Ultra-Low NOx emission cap of 14 nanograms per joule statewide by the same date. California South Coast AQMD and Bay Area AQMD maintain active NOx caps in some residential categories already. The practical implication is that homes replacing furnaces in 2026-2027 who pick 80% AFUE will face another replacement within 15-20 years into a market where only 95%+ units are legal, eliminating any eventual resale-friendly equivalent swap.
The 2026 financial picture for upgrading to 95%+ AFUE is fundamentally different from 2025. The federal Energy Efficient Home Improvement Credit (Section 25C), which offered 30% of cost up to $600 for qualifying 97%+ AFUE units, expired December 31, 2025 under the One Big Beautiful Bill Act signed into law July 4, 2025. HVAC equipment installed in 2026 does not qualify for any federal credit. State and utility rebates remain available at $100-$500 typical, and DSIRE.org maintains the current list by ZIP. A 95% AFUE unit saves approximately $500 per year over an 80% unit in cold climates, so the $1,500-$3,000 upcharge pays back in 4-7 years purely on fuel cost, credit or no credit.
| AFUE tier | Install cost (80k BTU) | Annual fuel savings vs 80% | 2026 federal credit |
|---|---|---|---|
| 80% AFUE standard | $3,800-$6,500 | Baseline | Expired |
| 90% AFUE high-efficiency | $5,000-$8,000 | 12-15% | Expired |
| 95%+ AFUE condensing | $6,000-$10,500 | 18-22% (~$500/yr cold climate) | Expired Dec 31 2025 |
| 97%+ AFUE ultra | $7,500-$12,000 | 20-25% | Expired |
The federal 25C credit expired December 31, 2025. HVAC installed in 2026 does NOT qualify. Utility and state rebates ($100-$500 typical) remain; verify via DSIRE.org before signing.
4
Ductwork Modifications When Replacing a Furnace
Ductwork modification scope is the line item that most often surprises homeowners on replacement bids because the old and new units almost never share identical cabinet dimensions. Light ductwork modification, which covers plenum transitions to reconnect existing trunks to a new cabinet, runs $500-$2,500 and is required on a majority of replacements simply because manufacturer cabinets differ. Heavy retrofit or partial duct replacement runs $2,000-$7,000, typically required when the new unit has higher CFM demand than the old trunks can carry or when branch lines have deteriorated. Full system replacement with new ductwork is $7,000-$16,000, and the 2026 national average for a 2,000-2,500 sqft home with full ducts is $11,590-$14,100.
Upgrading efficiency tiers triggers its own set of duct-adjacent work. Moving from an 80% AFUE unit to a 95%+ condensing unit requires transitioning from metal flue venting to PVC plus adding a condensate drain line, which adds $500-$1,500. The sealed-combustion design on 95%+ units also requires an outside air intake for combustion air, adding another $200-$500 in labor and materials. These are non-optional on efficiency upgrades, so any bid upgrading AFUE that omits venting transition is either missing scope or assuming existing venting works (usually it does not).
A clean quote itemizes ductwork scope separately from unit cost and labor so buyers can decide whether to approve the adjustment or stick with the old duct layout. Contractors who cannot explain why a specific plenum transition is required, or who quote a blanket 'duct adjustments' line without dimensions, are often either over-scoping for commission or planning to under-scope and issue a change order mid-project. Manual J load calculations and Manual D duct-sizing calculations are the professional standards for deciding whether existing ducts can carry the new unit's airflow. Price the full scope if equipment and ducts both need replacement using our HVAC install cost calculator.
- Light ductwork modification (plenum transition): $500-$2,500
- Heavy retrofit or partial replacement: $2,000-$7,000
- Full ductwork replacement: $7,000-$16,000
- National avg 2,000-2,500 sqft full system: $11,590-$14,100
- 80% to 95%+ AFUE PVC venting + condensate: $500-$1,500
- Outside air intake for sealed combustion: $200-$500
5
Replacement Quote Anatomy: Where Your $7,000 Actually Goes
A clean $7,000 gas furnace replacement quote decomposes into five buckets: the furnace unit itself at about 60% of total ($4,200), installation labor at 22% ($1,540), old-unit removal at 7% ($490), venting and ductwork adjustments at 8% ($560), and permit plus thermostat at 3% ($210). The unit is by far the largest line, which is why price-discovery on the unit brand and model is the single most important pre-bid research step. Value-tier brands like Goodman and Payne run $1,500-$3,000 for 80-90% AFUE gas; mid-tier Rheem and Bryant $2,500-$4,000; premium Carrier, Trane, and Lennox $3,500-$6,000 for 90-95%+ AFUE.
When comparing three bids on identical scope, recast each into these five buckets and outliers become obvious immediately. A bid where labor looks materially below 20% of total is probably rolling labor into the unit line, which makes it impossible to cross-shop the unit independently. A bid where removal is under $300 on a cast-iron old unit is either using a cheaper disposal method or planning to leave the old unit in place (illegal in most jurisdictions). A bid with no permit line at all is planning to work without one, which voids warranty and creates resale problems when the home sells.
The donut chart below visualizes the typical 60/22/8/7/3 breakdown for a $7,000 replacement. Brands and regional markets shift these percentages ±5%, but any single bucket more than 10 points outside the norm is a cross-shopping signal. Labor percentages in Northeast and West Coast markets climb to 25-30% because hourly rates are higher, while Midwest and South markets sometimes show labor as low as 18-20%. The unit percentage is the steadiest of the five across regions because manufacturer pricing is national.
Recast every bid into these 5 buckets. Labor under 20% usually means labor is rolled into the unit line; removal under $300 on a cast-iron old unit is suspicious; no permit line is a compliance problem.
6
Red Flags and How to Get Fair Furnace Replacement Quotes
Furnace work sits at the intersection of gas, electrical, and combustion, which means licensed HVAC contractors plus gas-fitting certification are both required for any gas or propane install. Before signing, verify license number, bonding, general liability insurance, and workers' compensation via a current Certificate of Insurance pulled directly from the insurance carrier, not a copy the contractor provides. A legitimate contractor welcomes verification because reputation is their business-development pipeline. Handyman or 'my brother does HVAC' arrangements are not acceptable for gas furnace work; improper combustion tuning produces carbon monoxide and kills people.
Maximum deposit on a furnace replacement is 25-30% of contract value. A $7,000 job should carry $1,750-$2,100 maximum down, with the balance due on completion and passed inspection. Contractors demanding 50%+ upfront are following the documented disappear-with-deposit pattern, which is especially common October through November when demand spikes and homeowners scramble. Similarly, 'same-day emergency replacement' sales pressure, typically framed as 'your old unit is unsafe, it must be replaced today,' is a classic scare tactic. A legitimate safety concern warrants shutoff and a documented combustion-analyzer reading, not same-day replacement without comparison bids.
Three specific scams recur in furnace replacement. First, condemnation without proof: a technician tags the old furnace red and declares it unsafe without providing a combustion-analyzer reading, a cracked heat exchanger photograph, or an actual carbon monoxide measurement. Always demand documentation and a second opinion before replacing under pressure. Second, oversizing for commission: installers quote a 100,000 BTU unit for a home that needs 70,000 because larger units carry larger price tags and commissions. Insist on a Manual J load calculation before signing for any unit above 80,000 BTU. Third, quick quotes without inspection, given over the phone or within minutes of walking in, almost always omit ductwork modification scope and resurface as a change order. For homeowners weighing an all-electric alternative, our heat pump install cost calculator prices the electrification path side-by-side.
October-November is peak scare-tactic season for furnace replacement scams. If a contractor tags your unit unsafe without a combustion-analyzer reading and pushes same-day replacement, shut off the unit, get 2 more bids, and verify condemnation with an independent second opinion.
- Minimum 3 written quotes from licensed + bonded + insured contractors
- Deposit cap: 25-30% of contract value
- HVAC license + gas-fitting certification required
- Manual J load calc required for any unit above 80k BTU
- Demand combustion-analyzer reading before condemnation
- Fair bid spread: 20-40% on identical scope
- Reject: quotes without inspection, same-day pressure, 50%+ deposits
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Last Updated: Jul 24, 2026
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.