Price a 2026 furnace replacement by fuel type, BTU size, and AFUE efficiency tier — then line up 3 licensed HVAC contractor quotes.
Fuel Type
Furnace Size
Efficiency & Ductwork
Location
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Frequently Asked Questions
Q
How much does a new furnace cost installed in 2026?
National average is $3,200-$7,800 installed, midpoint near $5,200. Gas furnaces run $3,500-$9,500 depending on AFUE tier. Electric is cheapest at $2,500-$5,500 upfront. Oil is most expensive at $4,000-$8,000 and largely Northeast-only. 100,000+ BTU units and new ductwork push totals past $12,000.
AFUE (Annual Fuel Utilization Efficiency) tells you how much fuel becomes heat. 80% AFUE is the standard-efficiency floor; 90% is mid-range high-efficiency; 95%+ AFUE condensing units are top-tier. Jumping from 80 to 95 AFUE adds $1,500-$3,000 to the install but saves 15-20% on annual heating bills — payback in 5-8 years in cold climates.
80% AFUE: standard efficiency, cheapest install
90% AFUE: high-efficiency, ~15% bill savings vs 80
Rule of thumb: 30-60 BTU per square foot depending on climate and insulation. A 1,500 sqft home in a moderate climate needs 60,000-80,000 BTU; a 2,500 sqft home in a cold climate needs 100,000+ BTU. Oversized furnaces short-cycle (waste fuel, wear out faster); undersized units run constantly. A Manual J load calculation from your HVAC contractor is the correct way to size.
Rule of thumb: 30-60 BTU/sqft
1,000-1,500 sqft: 40,000-60,000 BTU
1,500-2,000 sqft: 60,000-80,000 BTU
2,000-2,500 sqft: 80,000-100,000 BTU
2,500+ sqft / cold climate: 100,000+ BTU
Manual J load calc is the correct sizing method
Q
Does new ductwork increase furnace install cost a lot?
Yes — adding or replacing ductwork adds $2,500-$6,000 to a standard furnace install, or up to $10,000 on a full large-home replacement. Reusing sound existing ductwork is the single biggest cost saver. Ask your contractor to pressure-test the existing ducts; leaks over 15% warrant sealing or partial replacement but rarely a full tear-out.
New / replacement ducts: +$2,500-$6,000
Full large-home duct replacement: up to $10,000
Ductwork sealing (Aeroseal): $1,500-$3,000
Reusing sound ducts is biggest cost saver
Pressure-test existing ducts before deciding
Leaks >15%: seal, not full replacement
Q
Gas vs electric vs oil furnace — which is cheapest long term?
Natural gas wins long term in most US markets: $540-$665 annual fuel vs $900-$1,200 for electric and $1,200-$2,400 for propane. Oil is volatile and region-dependent. Electric has the cheapest install ($2,500-$5,500) but highest operating cost. Gas recoups its higher install within 2-4 years in cold climates.
Natural gas: $540-$665/year fuel
Electric: $900-$1,200/year fuel
Propane: $1,200-$2,400/year fuel
Oil: $1,500-$3,000/year (volatile)
Electric: cheapest install, priciest to run
Gas recoups higher install in 2-4 years
Q
Are there 2026 rebates or tax credits for high-efficiency furnaces?
Yes. The federal Energy Efficient Home Improvement Credit (25C) offers 30% of cost up to $600 for qualifying 97%+ AFUE natural gas furnaces through 2032. State and utility rebates stack on top — Mass Save, NYSERDA, and California Energy Commission programs commonly add $400-$1,500. Heat pumps receive larger credits ($2,000+) and may be a better play if you’re electrifying.
Federal 25C credit: 30% up to $600 (97%+ AFUE gas)
Typical install = furnace unit ($1,200-$6,000 depending on fuel + AFUE) + labor ($1,000-$3,500) + venting/ductwork ($500-$6,000) + permit ($150-$500) + regional labor adjustment (Northeast / California +15-25%). Size (BTU) scales unit cost roughly linearly. AFUE jumps (80 –> 90 –> 95%+) add $1,000-$2,000 per tier.
Where:
Furnace Unit= $1,200-$6,000 by fuel type and AFUE; 95%+ condensing priciest
Labor= $1,000-$3,500; includes removal of old unit
Ductwork= Reuse $0 vs new +$2,500-$6,000; full large-home replacement up to $10,000
Venting= Standard flue vs PVC for condensing adds $500-$1,500
Regional= Northeast / coastal metros +15-25% over Midwest baseline
Furnace Installation Costs in 2026: Gas vs Electric vs Oil
1
Furnace Install Cost in 2026: Fuel Type Sets the Band
Furnace replacement in 2026 clusters into four distinct fuel-type bands that each carry their own installed-cost range, infrastructure needs, and long-term operating profile. The national average installed cost is $3,200-$7,800 with a midpoint near $5,200, but the specific range your project lands in depends overwhelmingly on the fuel you burn. Natural gas leads the US market with 57% of homes; propane serves the rural gap; electric is concentrated in mild climates and small homes; oil is overwhelmingly a Northeast legacy fuel with shrinking market share.
Natural gas furnaces run $3,500-$9,500 installed depending on the AFUE efficiency tier (80, 90, or 95%+ condensing). A baseline 80,000 BTU 90% AFUE unit with reused ductwork lands $4,500-$7,500 in most US markets, with the upper end reserved for Northeast / California labor premiums and the lower end for Midwest and Southern markets. Propane furnaces cost $300-$500 more than natural gas because the burners are tuned for higher-pressure fuel and the fuel itself costs 2-3x natural gas on a per-BTU basis.
Electric furnaces are dramatically cheaper to install at $2,500-$5,500 because they have no combustion chamber, flue, or gas line work — just an electric resistance element and blower. But operating cost is 40-80% higher than natural gas in most US climates, so electric only makes financial sense in mild-climate homes running less than 2,000 heating hours per year, in homes without gas service where propane or oil would be the alternative, or as a temporary system pending a heat pump upgrade. Electric furnaces also last longer on average (20-25 years vs 15-20 for gas) because they have fewer moving combustion components and no heat exchanger to crack.
Oil furnaces at $4,000-$8,000 are the highest-install-cost option and are limited to homes with existing oil tanks and delivery infrastructure, primarily in New England and the Mid-Atlantic. Even homeowners replacing oil typically convert to natural gas or heat pump during the replacement rather than perpetuating the oil system, because oil fuel prices swing 30-50% year to year and tank-replacement cost ($1,500-$3,000 for above-ground, $5,000-$10,000 for buried) compounds the economic disadvantage. The hvac install cost calculator covers the whole-system alternatives including dual-fuel heat pump + backup furnace combinations popular in cold climates.
Furnace installed cost and annual fuel cost by fuel type, 2026. Source: Angi, HomeGuide, DOE.
Fuel Type
Install Cost
Annual Fuel Cost
$/BTU Efficiency
Natural gas (80-95% AFUE)
$3,500-$9,500
$540-$665
Low
Propane (80-95% AFUE)
$3,800-$9,800
$1,200-$2,400
Medium
Electric resistance
$2,500-$5,500
$900-$1,200
High (cold climate)
Oil (typ 85% AFUE)
$4,000-$8,000
$1,500-$3,000
Medium (volatile)
Natural gas wins long term in most US markets. Electric is cheapest to install but has the highest operating cost in cold climates. Oil is legacy-only — most homeowners convert during replacement.
2
AFUE Efficiency Tiers: 80 vs 90 vs 95%+ Condensing
AFUE (Annual Fuel Utilization Efficiency) measures what fraction of your fuel becomes usable heat versus escaping up the flue. An 80% AFUE furnace delivers 80 cents of heat per fuel dollar; a 95% AFUE condensing unit delivers 95 cents. The three commercial tiers — 80% standard, 90% high-efficiency, and 95%+ condensing — each have distinct pricing, venting, and payback characteristics.
80% AFUE units are the cheapest and simplest to install. They use standard metal flue venting and do not produce condensate, so installation is straightforward replacement into an existing flue. Typical install for a 60k-80k BTU gas unit is $3,500-$6,000. This tier is still the right call for mild climates (US South, coastal California) where annual heating hours are low and the fuel savings on a higher-efficiency unit won’t recover the cost premium.
90% AFUE high-efficiency furnaces hit the sweet spot for most of the US. Install cost rises to $4,500-$7,500 on the same 80,000 BTU baseline, the venting transitions to PVC (handles condensate from the cooler flue gas), and annual fuel savings run 12-15% vs an 80 AFUE unit. Payback in cold climates (Upper Midwest, Northeast, Mountain West) is typically 4-7 years; in warmer zones, payback stretches to 10+ years and 80 AFUE becomes more defensible. The attic insulation calculator quantifies insulation upgrades that compound the AFUE savings.
95%+ AFUE condensing furnaces are the top commercial tier at $5,500-$9,500 installed on an 80,000 BTU baseline. They extract additional heat by condensing water vapor out of flue gas, requiring a PVC vent + condensate drain line, and the sealed-combustion design pulls outside air for burning (safer but adds ductwork). Annual fuel savings run 18-22% vs an 80 AFUE unit. The DOE estimates that upgrading from an old 78% AFUE furnace to a 95% model saves over $1,275 annually — which is why 95%+ units qualify for the federal Energy Efficient Home Improvement Credit (25C) of 30% up to $600 through 2032.
AFUE jumps each add $1,000-$2,000 to install. The 80 –> 95 upgrade pays back in 5-8 years in cold climates, but stretches past 10 years in the South.
80% AFUE: $3,500-$6,000 install, standard flue, no condensate
Furnace sizing is the single most consequential engineering decision in a replacement and the one homeowners most often get wrong. The rule of thumb is 30-60 BTU per square foot of conditioned space depending on climate zone and insulation quality, but this is only a starting point. A proper Manual J load calculation from your HVAC contractor accounts for window type and orientation, insulation R-values, air-leakage rate, internal heat gains, and climate zone — and it’s the correct way to size a furnace.
Undersized furnaces (too few BTU) run continuously in cold weather, fail to reach setpoint on the coldest days, and burn out earlier from continuous operation. Oversized furnaces are the more common mistake: they heat the house quickly, short-cycle (turn on and off rapidly), waste fuel during the ignition phase, and produce large temperature swings that feel uncomfortable. Short-cycling also wears out the ignitor, blower motor, and heat exchanger dramatically faster — replacing a heat exchanger mid-life costs $1,500-$2,500 and often totals the unit.
Common sizing bands. A 1,000-1,500 sqft home in a moderate climate typically needs 40,000-60,000 BTU. A 1,500-2,000 sqft home needs 60,000-80,000 BTU. A 2,000-2,500 sqft home needs 80,000-100,000 BTU. Homes above 2,500 sqft or in cold climates (Upper Midwest, Northern New England, Mountain West) need 100,000+ BTU. Jumping up one size band adds 10-20% to the installed cost; jumping from 80,000 to 100,000+ BTU on a cold-climate home adds 25-35% to the baseline price because the units are physically larger and require heavier venting.
Typical furnace sizing by home size and climate, with baseline 90% AFUE gas install cost.
Home Size
Moderate Climate
Cold Climate
Typical Install
1,000-1,500 sqft
40k-60k BTU
50k-70k BTU
$3,000-$5,500
1,500-2,000 sqft
60k-80k BTU
70k-90k BTU
$4,000-$7,000
2,000-2,500 sqft
80k-100k BTU
90k-110k BTU
$5,000-$8,500
2,500+ sqft
100k+ BTU
120k+ BTU
$6,000-$11,000
4
Ductwork: Reuse, Seal, or Replace
Ductwork is the largest variable on top of the base furnace install. Reusing sound existing ductwork adds $0; adding or replacing ductwork adds $2,500-$6,000 for partial work and up to $10,000 for a full large-home replacement. The single biggest cost-control lever on a furnace project is pressure-testing your existing ducts before committing to new work. Most 20-year-old duct systems leak 15-30% of conditioned air; sealing them with Aeroseal or manual mastic typically costs $1,500-$3,000 and recovers enough efficiency that replacement rarely pays back.
Full duct replacement is justified in three specific scenarios: (1) flex-duct systems over 25 years old with visible tears or collapsed sections, (2) rigid galvanized systems with rust-through or rodent damage, or (3) homeowners combining a full HVAC replacement with a major remodel where drywall is already open. In all three cases, the marginal cost of new ductwork is lower because the access is already there. Outside those cases, seal-don’t-replace is the cost-optimal play.
Venting changes are a smaller but real line item. Upgrading from 80% AFUE to a 90 or 95%+ condensing unit means transitioning from metal flue to PVC venting plus a condensate drain line, which adds $500-$1,500. Sealed-combustion condensing furnaces also need an outside air intake, another $200-$500 in labor. The home renovation estimator folds HVAC work into a broader remodel scope if you’re bundling projects.
Reuse sound existing ducts: $0 adder
Duct sealing (Aeroseal / mastic): $1,500-$3,000
Partial duct replacement: $2,500-$6,000
Full large-home replacement: up to $10,000
PVC venting for condensing: +$500-$1,500
Outside air intake (sealed combustion): +$200-$500
Pressure-test first — most leaks can be sealed
5
Cost Breakdown: Where Your $5,000-$8,000 Actually Goes
A clean gas furnace install quote decomposes into five buckets: furnace unit at 35% of total, labor at 30%, venting and ductwork adjustments at 15%, permit and thermostat at 5%, and miscellaneous (filter cabinet, condensate pump, electrical) at 15%. On a typical $6,000 install of an 80,000 BTU 90% AFUE gas furnace with reused ducts, that’s roughly $2,100 in unit cost, $1,800 in labor, $900 in venting, $300 in permits, and $900 in miscellaneous.
The donut below visualizes the typical split. When comparing multiple bids, recast each into these buckets and outliers become obvious. A bid where the labor line looks materially below 25% is probably rolling labor into the unit price (which makes cross-shopping the unit impossible), or cutting corners on removal of the old furnace, asbestos inspection if the home is pre-1980, or building inspection sign-off.
The furnace unit itself varies widely by brand and tier. Goodman and Payne are the value-tier brands at $1,200-$2,500 for 80-90 AFUE gas; Carrier, Trane, and Lennox are the premium tier at $2,500-$4,500 for 90-95%+ AFUE; Rheem and Bryant are mid-tier. Premium-brand units carry 10-year parts warranties but the install labor is where contractor markup hides. Getting three bids on the same spec unit is the only reliable way to price-discover the labor component.
Labor includes removal of the old furnace (which may have asbestos insulation if pre-1980), new-unit placement, gas-line connection, electrical connection, ductwork transition, venting, condensate drain for condensing units, thermostat wiring, startup and commissioning, and a combustion-efficiency test. A proper commissioning takes 2-3 hours on top of physical install; contractors who skip it are cutting $200-$400 and leaving 5-10% efficiency on the table. Also verify the contractor registers the unit with the manufacturer during commissioning — most 10-year parts warranties require registration within 60-90 days of install, and unregistered units drop back to a 5-year baseline warranty.
Get three bids on the same spec unit. Labor is where markup hides — bids that roll labor into unit price block apples-to-apples comparison.
6
Red Flags and Mistakes When Hiring a Furnace Contractor
Furnace work sits at the intersection of gas, electrical, and combustion — three trades that each demand licensed installers. Verify the contractor holds an HVAC license (or mechanical contractor license, depending on state) and gas-fitting certification before signing. General handymen or "my brother does HVAC" setups are not acceptable for gas furnace work; improper combustion tuning produces carbon monoxide and kills people. Require license number, bonding, general liability, and workers’ comp insurance via Certificate of Insurance.
Maximum deposit on a furnace install is 25-30% of the contract. A $7,000 install should have $1,750-$2,100 maximum down. Anyone demanding 50%+ before the unit arrives is following the documented disappear-with-deposit pattern, which is especially common in October-November when demand spikes and homeowners are scrambling. Similarly, "emergency replacement" sales pressure — being told your old furnace is "unsafe" and must be replaced today — is a classic scare tactic. A legitimate safety concern warrants shutoff and a follow-up quote; it does not warrant same-day replacement without comparison bids.
Two specific scams to watch for. First, "condemnation without proof" — a technician tags your furnace red and tells you it’s unsafe without providing the combustion-analyzer reading, cracked heat exchanger photo, or carbon monoxide measurement that would justify the condemnation. Always demand documentation. Second, oversizing for commission — installers sometimes quote a 100,000 BTU unit for a home that needs 70,000 because the unit costs more and commission rises with price. Insist on a Manual J load calculation before signing for any unit above 80,000 BTU.
Improper furnace combustion tuning produces carbon monoxide. Verify HVAC license and gas-fitting certification — handyman installs are not acceptable on gas or propane units.
HVAC or mechanical contractor license required
Gas-fitting certification required for gas/propane
Verify license, bonding, GL, workers’ comp
Maximum deposit: 25-30% of contract
Watch for "emergency replacement" pressure in Oct-Nov
Demand combustion-analyzer readings before condemnation
Insist on Manual J load calc for units 80k+ BTU
Bids that roll labor into unit price block comparison
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.
