Furnace Replacement Cost in 2026: What to Expect
Last updated: March 25, 2026
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Cost Breakdown by Tier
| Component | Budget | Mid-Range | Premium |
|---|---|---|---|
| Materials | $1,400 | $2,200 | $4,000 |
| Labor | $1,200 | $1,700 | $2,300 |
| Permits | $200 | $300 | $400 |
| Total | $2,800 | $4,500 | $7,500 |
Budget
80% AFUE single-stage gas furnace, basic brand (Goodman or Amana), direct replacement with existing ductwork and venting
Mid-Range
90-95% AFUE two-stage gas furnace, mid-tier brand (Rheem, Trane, or Carrier), standard installation with smart thermostat
Premium
97-98% AFUE modulating variable-speed gas furnace, premium brand (Lennox or American Standard), with zoning controls and whole-house humidifier
What Drives the 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.
Cost by Material or Type
| Option | Cost |
|---|---|
| Single-Stage Gas Furnace (80% AFUE)Mild climates, budget-focused homeowners, homes with high ceilings or poor insulation where efficiency gains are minimal | $2,000 - $3,500 installed |
| Two-Stage Gas Furnace (90-96% AFUE)Most homeowners in cold climates, the sweet spot of cost vs. performance | $3,500 - $5,500 installed |
| Modulating Gas Furnace (97-98% AFUE)Cold climates with high heating bills, homeowners planning to stay 10+ years | $5,500 - $8,500 installed |
| Oil Furnace (83-87% AFUE)Rural areas without natural gas service, Northeast homes with existing oil infrastructure | $3,000 - $6,000 installed |
| Electric FurnaceMild climates with low heating needs, areas with very cheap electricity, supplemental heating | $1,500 - $3,500 installed |
Regional Cost Variations
Labor rates and material costs vary significantly by region. Apply these multipliers to the national average to estimate costs in your area.
| Region | Adjustment | Est. Average |
|---|---|---|
| Northeast | +15% to +25% | $5,175 - $5,625 |
| West Coast | +20% to +35% | $5,400 - $6,075 |
| Southeast | -15% to -10% | $3,825 - $4,050 |
| Midwest | -15% to -5% | $3,825 - $4,275 |
| Mountain West | +5% to +10% | $4,725 - $4,950 |
Timeline & What to Expect
DIY vs. Professional
Good for DIY
- Researching and purchasing the furnace unit directly
- Replacing air filters and basic thermostat swaps
- Cleaning and inspecting visible ductwork
- Removing the old furnace after professional disconnection
Potential savings: 25-35% ($800-$2,000)
Hire a Pro
- Gas line connections and leak testing
- Electrical wiring and control board hookups
- Venting installation (both standard and high-efficiency PVC)
- Load calculations and system sizing
- Permit pulling, inspections, and code compliance
- Refrigerant line work if combined with AC
DIY feasibility: Not recommended - furnace replacement involves gas lines, electrical wiring, and combustion venting that require licensed professionals in most jurisdictions
Risk warning: Gas furnace installation errors can cause carbon monoxide poisoning, gas leaks, house fires, and explosions. Most jurisdictions require licensed HVAC technicians and permits. DIY installation voids virtually all manufacturer warranties and may void your homeowner's insurance.
How to Save Money
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
Check your utility company for efficiency rebates - many offer $300-$1,000 for high-AFUE units
Consider buying the furnace unit directly and hiring an HVAC company for install only to save 15-25%
Choose a two-stage 92-95% AFUE unit for the best cost-to-savings ratio in cold climates
Bundle with AC replacement - HVAC companies often discount 10-15% when replacing both systems
Ask about financing - many manufacturers offer 0% APR for 12-36 months through dealer programs
Skip the extended warranty if your installer offers a workmanship guarantee - manufacturer warranties cover 10-20 years on heat exchangers
Questions to Ask Your Contractor
“What size furnace does my home need, and how did you determine that?”
Why this matters: A proper Manual J load calculation accounts for your home's square footage, insulation, windows, and climate. A contractor who just matches your old furnace size may over- or under-size the replacement.
“What AFUE rating do you recommend, and what is the payback period?”
Why this matters: The most efficient furnace is not always the best value. A good contractor will calculate your estimated annual savings and show you the payback timeline.
“Will my existing ductwork and venting work with the new unit?”
Why this matters: Upgrading from 80% to 90%+ AFUE requires PVC venting instead of a chimney flue. Undersized ductwork reduces efficiency and comfort regardless of furnace quality.
“Is the quote all-inclusive - unit, labor, materials, permits, disposal, thermostat?”
Why this matters: HVAC quotes vary wildly in what they include. Some bundle the thermostat and permits; others charge separately for everything.
“What brand and model are you quoting, and what is the warranty?”
Why this matters: Generic 'high-efficiency furnace' quotes make it impossible to compare. Get the exact model number so you can verify specifications and pricing.
“Are you licensed and insured, and will you pull the permit?”
Why this matters: Unlicensed HVAC work is illegal in most states. Unpermitted installations can cause problems at home sale and may void insurance coverage.
“Do you offer a workmanship warranty beyond the manufacturer warranty?”
Why this matters: Manufacturer warranties cover the equipment but not the installation labor. A 1-2 year workmanship guarantee protects you from installation defects.
Sources & Methodology
Cost data cross-referenced from multiple sources. See our full methodology for details on how we research and calculate costs.
- HomeAdvisor - Furnace Replacement Cost (2025)
- Fixr - Furnace Installation Cost (2025)
- Angi - How Much Does a New Furnace Cost? (2025)
- HVAC.com - Furnace Cost Guide (2025)
- U.S. Department of Energy - Furnaces and Boilers (2025)
Quick Answer
National Average
$4,500
Typical Range
$2,500 - $7,500
Low End
$2,000
High End
$10,000
Cost Per sq ft of home
$1.5 - $4.5