Furnace Replacement Cost Calculator

Get a realistic installed cost estimate for a new furnace before you call a single contractor. Choose your fuel type, home size, region, and quality tier, or use the repair vs replace tool to decide whether fixing your current furnace even makes sense. All figures are calibrated to 2024 national contractor pricing data.

By D. Mercer, Indoor Air Quality Consultant
Gas, propane, oil, and heat pump All US regions Repair vs replace tool AFUE energy savings
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What do you want to figure out?

Tap an option to continue.

What fuel does the furnace use?

Oil and propane systems cost more than natural gas due to tank and line complexity. Tap to continue.

What size is the home?

Larger homes need higher BTU equipment, which costs more. Tap to continue.

Where are you located?

Labor rates vary by 30 to 45 percent across US regions. Tap to continue.

What quality level?

Higher tiers mean quieter operation, longer warranty, and better efficiency staging. Tap to continue.

What efficiency?

Higher AFUE costs more upfront but saves on fuel every year. Tap to continue.

Any add-ons with this replacement?

Select everything that applies, then tap Continue. Leave all unchecked if you just want the base furnace cost.

How old is your furnace?

Age is half of the repair vs replace equation. Tap to continue.

What is the repair quote?

Enter the total cost the technician quoted, including parts and labor.

Common repairs: heat exchanger $1,000 to $2,500, blower motor $400 to $700, gas valve $300 to $600, ignitor $150 to $300.

Products to improve comfort while you plan a replacement

A smart thermostat and a quality filter protect the system you have and prepare for the upgrade. As an Amazon Associate, this site earns from qualifying purchases.

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Quick answers How it works Cost breakdown Labor costs AFUE and savings Repair vs replace Add-on costs Common mistakes FAQ

Furnace Replacement Cost Quick Answers

These are the numbers I give clients before the first contractor even calls back. The calculator above refines them for your fuel type, home size, and location.

  • National average installed cost: $2,500 to $7,500 for a gas furnace, all tiers combined.
  • Budget gas furnace (installed): $1,800 to $3,000 depending on region.
  • Mid-range gas furnace (installed): $3,000 to $5,500 depending on region.
  • Premium variable-speed gas furnace: $5,000 to $9,000 installed.
  • Oil furnace: add 20 to 35 percent to gas costs, depending on complexity.
  • Repair vs replace rule: if repair cost times furnace age exceeds 5,000, replace.
  • AFUE savings (80% to 96%): roughly $100 to $350 per year depending on home size and climate.

How This Furnace Replacement Cost Calculator Works

This calculator starts from 2024 installed pricing data published by HomeAdvisor, Angi, and the ACCA contractor network, then adjusts for four variables that actually move the number: fuel type, home size (which drives BTU capacity and equipment cost), regional labor rates (which vary up to 45 percent nationally), and quality tier (which covers budget single-stage through premium variable-speed systems).

Estimates are presented as a range of plus or minus 15 to 20 percent, because contractor pricing legitimately varies by that much within the same ZIP code. Use the estimate to screen quotes and spot outliers, not as a final negotiating number. A quote more than 20 percent above the range is worth getting a second bid on.

Furnace Replacement Cost by Fuel Type and Tier (2024)

These figures are fully installed costs including equipment, labor, and standard startup. They are computed with the same formulas the calculator uses for a medium-size home (1,500 to 2,500 sq ft) and do not include add-ons such as a coil, humidifier, or permit.

Fuel typeBudgetMid-rangePremium
Natural gas (Midwest)$2,125 to $2,950$2,890 to $4,012$4,420 to $6,136
Natural gas (Northeast)$2,431 to $3,375$3,196 to $4,437$4,726 to $6,561
Natural gas (South)$1,972 to $2,738$2,737 to $3,800$4,267 to $5,924
Propane$2,200 to $3,000$3,000 to $4,200$4,600 to $6,400
Oil furnace$2,700 to $3,800$3,800 to $5,300$5,500 to $7,700
Heat pump (electric)$2,100 to $3,000$3,200 to $4,400$5,000 to $7,000

Labor Costs and What Drives Them

Labor typically accounts for 30 to 40 percent of the total installed cost of a furnace replacement. HVAC technician rates in the US range from $75 per hour in parts of the South to $150 or more in the Northeast and on the West Coast, and most furnace replacements run 4 to 8 hours including removal, installation, startup, and system checkout.

The complexity that adds time: switching fuel types (gas to oil or vice versa), moving the furnace to a new location, upgrading the flue from single-wall metal to PVC (required for condensing furnaces), and any ductwork modifications. A like-for-like replacement in the same location with the same fuel and flue type is always the fastest and cheapest labor scenario.

Keep your current system running well while you plan

Regular maintenance extends run life and keeps the quote honest. As an Amazon Associate, this site earns from qualifying purchases.

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AFUE Ratings and Annual Fuel Savings

AFUE (Annual Fuel Utilization Efficiency) is the DOE standard for furnace efficiency: a 96% AFUE furnace converts 96 cents of every fuel dollar into heat and exhausts 4 cents. The current DOE minimums are 80% AFUE for most of the US, with ENERGY STAR certification starting at 95%.

The annual savings from upgrading depend on your local fuel prices and heating degree days, but a rough guide for a northern US home of 2,000 square feet: switching from an old 70% AFUE system to a new 96% saves about $250 to $350 per year in natural gas, and the payback period on the efficiency premium runs 10 to 18 years. That math improves significantly in climates with long heating seasons and with propane or oil fuel, where fuel prices are higher.

Upgrade pathNorth (600 therms base)South (275 therms base)
70% to 96% AFUE, 2,000 sq ft~$279/yr savings~$128/yr savings
80% to 96% AFUE, 2,000 sq ft~$150/yr savings~$69/yr savings
80% to 90% AFUE, 2,000 sq ft~$83/yr savings~$38/yr savings
80% to 96% AFUE, 3,000 sq ft~$225/yr savings~$103/yr savings

Repair vs Replace: The Rule of 5000

The HVAC industry uses the Rule of 5000 as a quick decision filter: multiply the repair cost by the furnace age. If the result exceeds 5,000, replacement is almost always the better financial decision. A $600 repair on a 10-year-old furnace scores 6,000: replace. A $500 repair on a 6-year-old furnace scores 3,000: repair.

Three other triggers always point to replacement regardless of the score. First, any furnace over 20 years old has likely exhausted its design life and will keep generating repair bills even if this one is fixed. Second, any repair that exceeds 50 percent of the replacement cost is money better put toward the new system. Third, a cracked heat exchanger is a replacement, not a repair, because it is a carbon monoxide risk and cannot be safely patched.

Add-On Costs to Budget For

A furnace quote that looks low often excludes items that end up on the invoice. These are the most common add-ons and their typical costs, which are also built into the calculator above.

Add-onTypical costWhen needed
Evaporator coil (A-coil)$500 to $800Any system with central AC
Whole-house humidifier$400 to $650Dry winter climates, sinus issues
Smart thermostat$200 to $350Upgrading from manual or older programmable
Permit and inspection$125 to $250Required in most US jurisdictions
Old unit disposal$75 to $150Often included; confirm before signing
Minor ductwork modifications$300 to $600Different size unit, moving location
Gas line extension$300 to $500Switching from oil, or moving unit

Always ask for a line-item quote that lists equipment model number, labor hours, and each add-on separately. A quote that bundles everything into a single number is hard to compare and easy to pad.

Install the quality-of-life additions yourself and save

Smart thermostats, filters, and CO detectors are easy homeowner installs. As an Amazon Associate, this site earns from qualifying purchases.

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Common Furnace Replacement Mistakes

  • Not pulling a permit. An unpermitted furnace replacement can void your homeowner’s insurance, create problems at resale, and leave you with no recourse if the installation is done incorrectly. Permits cost $125 to $250 and are required in most jurisdictions.
  • Accepting the first quote. HVAC quotes legitimately vary by 20 to 40 percent for the same scope of work. Get three quotes and compare line items, not just totals.
  • Upsizing the furnace. Contractors sometimes install a larger furnace than needed, citing safety margin. An oversized furnace short cycles, wears out faster, and delivers uneven heat. Insist on an ACCA Manual J load calculation before accepting a size recommendation.
  • Choosing the highest AFUE without doing the payback math. A 96% AFUE furnace costs $500 to $1,500 more than an 80% unit. In the South where heating loads are small, the payback can exceed 25 years.
  • Forgetting the coil. If your home has central AC, the evaporator coil must be compatible with the new furnace. Many installers quote furnace only and add the coil as a change order.
  • Not asking about utility rebates. ENERGY STAR high-efficiency furnaces qualify for rebates of $100 to $500 or more from many gas utilities. Ask before signing, because some rebates must be applied for within 30 days of installation.

Frequently Asked Questions

How much does it cost to replace a furnace in 2024?
The national average for a fully installed gas furnace replacement runs $2,500 to $7,500, with most mid-range jobs landing between $3,000 and $5,500. Budget systems start around $1,800 installed and premium variable-speed systems can reach $9,000 or more in high-labor markets like the Northeast. Fuel type, home size, and your region move the number significantly, which is why the calculator above produces a range rather than a single figure.
How long does a furnace last?
A well-maintained gas furnace lasts 15 to 20 years. Oil furnaces tend to run slightly shorter at 15 to 18 years with consistent maintenance. Systems that have been neglected or run with dirty filters often fail earlier at 10 to 12 years. If your furnace is past 15 years and needs a significant repair, treat the repair quote as part of the replacement decision, not a standalone cost.
Is it worth replacing a furnace before it breaks?
Yes, in most cases, if the furnace is over 15 years old and you are doing the replacement on your schedule rather than on an emergency basis in January. Planned replacements save the emergency service fee ($150 to $300), give you time to get multiple quotes, and let you choose the installation date. An emergency replacement in a cold snap often means whatever equipment the contractor has in stock, not what you would have chosen.
What is a good AFUE rating for a furnace?
For most US homes, 96% AFUE is the best balance of efficiency and payback period in cold climates, and it qualifies for ENERGY STAR certification and most utility rebates. In the South and Southwest where heating loads are light, 80% AFUE is often the smarter financial choice because the fuel savings from upgrading to 96% take 20 or more years to recoup the premium. The DOE national minimum is 80% AFUE.
How much does labor cost to install a furnace?
Furnace installation labor runs $800 to $1,800 in most US markets, with the Northeast and West Coast at the high end. The range reflects HVAC technician rates of $75 to $150 per hour and a typical installation time of 4 to 8 hours. Switching fuel types, moving the furnace location, or converting the flue from metal to PVC all add time and cost to the labor estimate.
What is the Rule of 5000 for furnace repair?
The Rule of 5000 is the HVAC industry standard for the repair vs replace decision: multiply the repair cost in dollars by the furnace age in years. If the result exceeds 5,000, replace the furnace. A $700 repair on a 10-year-old furnace scores 7,000 and points to replacement. A $400 repair on a 6-year-old furnace scores 2,400 and is usually worth doing. Any furnace over 20 years old is a replacement regardless of the score.
How much does a high-efficiency furnace save per year?
Upgrading from a standard 80% AFUE gas furnace to a 96% AFUE model saves roughly $100 to $350 per year in a northern US home of 1,500 to 2,500 square feet, based on an average gas price of $1.50 per therm. The savings are larger in cold climates with long heating seasons and with propane or oil fuel. The efficiency premium typically costs $500 to $1,200 more upfront, putting the payback at 5 to 12 years in cold climates.
Do you need a permit to replace a furnace?
Yes, in most US jurisdictions a furnace replacement requires a mechanical permit and a subsequent inspection by the building department. The permit ensures the installation meets local codes including NEC electrical connection requirements, proper gas line sizing, correct flue venting, and combustion air supply. Skipping a permit can void your homeowner’s insurance and create problems when you sell the home.
Can I replace just the furnace without replacing the AC?
Yes, and it is done every day. The furnace and air conditioner are separate systems that share the air handler and ductwork. You can replace the furnace and keep the existing AC coil, provided the evaporator coil is compatible with the new furnace’s airflow rating. Ask the installer to confirm coil compatibility before the job, and budget for a coil replacement ($500 to $800) if they are not compatible.
What brands of furnace are the most reliable?
The most consistently reliable residential gas furnaces based on consumer reports and HVAC contractor surveys are Lennox, Carrier, Trane, and Rheem at the premium and mid tiers, and Payne, Goodman, and International Comfort Products at the budget tier. Brand matters less than the installing contractor’s experience and the terms of the warranty, since most heat exchangers now carry lifetime warranties regardless of brand.
How much does it cost to replace a furnace heat exchanger?
Heat exchanger replacement runs $1,000 to $3,500 including parts and labor, and in most cases it is not worth doing on a furnace over 12 to 15 years old. A cracked heat exchanger leaks combustion gases including carbon monoxide into the living space and is a safety hazard that must be addressed immediately. If your furnace is mid-life and the heat exchanger is still under warranty, the repair can make sense. On an aging system, replacement is almost always the better financial and safety decision.
What size furnace do I need for my house?
Furnace sizing is done by an ACCA Manual J heating load calculation, which accounts for home square footage, insulation, window area, air leakage, and local outdoor design temperatures. A rule of thumb used for budgeting is 30 to 60 BTU per square foot depending on climate: a 2,000 square foot home in the Midwest typically needs a 60,000 to 80,000 BTU furnace. Oversizing a furnace causes short cycling, uneven heat, and premature wear, so the Manual J calculation matters.

Cost estimates are based on 2024 national contractor pricing data and are provided for planning purposes. Actual quotes depend on local labor rates, specific equipment selected, site conditions, and contractor pricing. Always get at least three competitive bids and verify permit requirements with your local building department. As an Amazon Associate, this site earns from qualifying purchases.