Furnace Replacement Cost Calculator
Estimate the cost of replacing your furnace based on home size, efficiency level, and installation options.
A furnace replacement costs $2,500 to $7,500, with a national average of $4,500. Use the calculator below to estimate your cost by size, quality tier, and location.
Last updated: March 25, 2026
Furnace Replacement Cost Calculator
Estimate the cost of replacing your furnace based on home size, efficiency level, and installation options.
Estimated Total
$4,410
Itemized Breakdown
This calculator provides estimates based on national averages adjusted for your region. Actual costs may vary significantly based on specific project conditions, contractor availability, material prices, and local market factors. Always get at least 3 quotes from licensed, insured contractors before starting your project.
Want the full picture?
Read our complete Furnace Replacement cost guide with material comparisons, contractor tips, savings strategies, and regional pricing data.
Quick Cost Reference
Cost by Tier
80% AFUE single-stage gas furnace, basic brand (Goodman or Amana), direct replacement with existing ductwork and venting
90-95% AFUE two-stage gas furnace, mid-tier brand (Rheem, Trane, or Carrier), standard installation with smart thermostat
97-98% AFUE modulating variable-speed gas furnace, premium brand (Lennox or American Standard), with zoning controls and whole-house humidifier
How This Calculator Works
This furnace replacement cost calculator estimates your total project cost from four inputs: project size, quality tier, the options you select, and your location. It combines material and labor rates for your chosen tier, adds typical permit costs, then applies a regional cost multiplier so the estimate reflects pricing in your state.
Estimates use 2026 cost data cross-referenced from multiple industry sources. Treat the result as a planning range, not a quote. Your final price depends on your specific scope, material choices, and local contractor availability, so collect at least three itemized bids before you set a budget.
What Affects Your Furnace Replacement Cost
Furnace Efficiency (AFUE Rating)
$800 - $3,000AFUE (Annual Fuel Utilization Efficiency) measures how much fuel becomes heat. An 80% AFUE unit wastes 20 cents of every dollar. A 95% AFUE furnace costs $800-$1,500 more upfront but saves $200-$400 per year on gas bills. Top-tier 98% AFUE modulating furnaces add another $1,000-$2,000 but offer the best long-term savings.
Furnace Size (BTU Output)
$500 - $2,000Furnaces are sized by BTU output. A 60,000 BTU unit heats 1,200-1,500 sq ft and costs $1,200-$2,500 for the equipment. An 80,000 BTU unit covers 1,600-2,000 sq ft at $1,500-$3,200. Large 120,000+ BTU units for 2,500+ sq ft homes run $2,200-$4,500. Proper sizing through a Manual J calculation prevents short cycling and cold spots.
Venting Changes
$300 - $1,500An 80% AFUE furnace uses a standard metal chimney flue. Upgrading to a 90%+ high-efficiency unit requires PVC venting through a sidewall, which costs $300-$800 for the venting work. If your chimney flue needs to be abandoned and capped, add another $200-$500.
Ductwork Condition
$500 - $3,000If your existing ductwork is undersized, leaky, or damaged, the new furnace will not perform efficiently. Duct sealing runs $500-$1,200. Partial duct replacement costs $1,000-$2,500. A complete ductwork overhaul for a 2,000 sq ft home runs $3,000-$7,000.
Fuel Type Conversion
$1,000 - $4,000Switching from oil to gas requires a new gas line ($500-$2,000) plus the furnace swap. Converting from electric to gas involves gas line installation and new venting. Switching from gas to electric (heat pump) may need electrical panel upgrades. Staying with your current fuel type is always the cheapest path.
Frequently Asked Questions
How much does a furnace replacement cost?
A furnace replacement costs $2,500 to $7,500 for a typical project, with a national average of $4,500. Budget projects start around $2,000, and premium work can reach $10,000. Use the calculator above for an estimate matched to your size, quality tier, and state.
How does this furnace replacement cost calculator work?
It combines 2026 material and labor rates for your selected quality tier, adds typical permit costs and any options you choose, then applies a cost multiplier for your state. Adjust the inputs to see your estimate update instantly.
Is this calculator free to use?
Yes. This furnace replacement cost calculator is free, requires no signup, and returns instant estimates.
Does the estimate include labor and permits?
Yes. Each estimate combines material and labor costs for your chosen quality tier plus typical permit fees. Your final price still depends on your specific scope and local contractor rates, so collect itemized quotes before budgeting.
How can I lower my furnace replacement cost?
Get quotes in spring or early fall when HVAC companies are less busy - many offer 10-20% off-season discounts Look for manufacturer rebates, which typically run $200-$800 and stack with utility rebates
Free newsletter
Stay current on what renovations actually cost
Updates from CostToRenovate, when there is something worth sending. Free, no spam.