Furnace Replacement Cost Calculator
Estimate the cost of replacing your home furnace — including the unit, installation labor, ductwork, thermostat, and permits. Compare gas, electric, oil, propane, and dual-fuel systems across climate zones and efficiency tiers. Free, no sign-up required.
Total conditioned space. A 1,500 sqft home typically needs a 60,000-80,000 BTU furnace in moderate climates.
BTU/sqft ranges from 30 (Florida, southern Texas) to 60 (Minnesota, Maine). Pick your zone for accurate sizing.
Mid-tier 90% AFUE is the most common replacement. High-efficiency 96%+ units save $200-$400/year on fuel but cost $1,500-$3,000 more upfront.
Simple swap: same location, no ductwork. New ducts: full system re-design, adds $2,000-$4,000+.
Optional Add-Ons
Needed for high-efficiency electric or when upgrading from 100A to 200A service.
🔥 Total Project Cost
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furnace + labor + add-ons
Furnace BTU
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Furnace Unit
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Installation
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Add-Ons
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📊 Detailed Breakdown
| Component | Value |
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Annual Fuel Cost
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Estimated yearly heating cost at your climate zone
High-Efficiency Upgrade Payback
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Years to recoup the 96% AFUE upgrade vs basic
💡 What this means
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🛒 Shop furnace & HVAC supplies
🛒 See furnace filters on Amazon →📝 How to use this furnace cost calculator
- Enter your home’s square footage. Total conditioned space (above-grade finished floor area). Most homes are 1,000-2,500 sqft.
- Pick your climate zone. 30 BTU/sqft for warm southern states, up to 60 BTU/sqft for northern Minnesota or Maine. Undersized = cold rooms; oversized = short-cycling and wasted fuel.
- Choose your fuel type. Gas is most common in the US. Electric is cheaper to install but more expensive to run. Dual-fuel combines a heat pump with a gas furnace backup.
- Select efficiency tier. Mid-tier 90% AFUE is the most-installed. High-tier 96%+ saves $200-$400/year on fuel but costs $1,500-$3,000 more and may need new venting.
- Set installation complexity. Simple swap (same location, no duct changes) vs full ductwork re-design (adds $2,000-$4,000+). Most replacements are “standard.”
- Adjust add-ons. Old furnace removal, ductwork mods, thermostat upgrade, permits, and electrical upgrades. Defaults are national averages — get 2-3 HVAC quotes for your exact situation.
- Click Calculate. See the total installed cost, furnace unit cost, labor, annual fuel estimate, and the payback period for a high-efficiency upgrade.
📌 5 tips for saving on furnace replacement
- ✓ Get 3+ quotes in fall or spring. HVAC companies are slow September-November and March-May. Quotes are 10-20% lower in off-peak months. Avoid emergency winter replacements — you pay a 30-50% rush premium.
- ✓ Size the furnace by Manual J load calculation, not rule of thumb. Many installers oversize furnaces to “be safe,” but a 100,000 BTU furnace in a 1,500 sqft home wastes $200-$400/year in fuel and shortens equipment life. Insist on a Manual J calculation ($100-$300, often credited to the install).
- ✓ Upgrade to 96% AFUE only if you stay 7+ years. A high-efficiency gas furnace costs $1,500-$3,000 more than a 90% unit but saves $200-$400/year in fuel. The payback is 6-10 years. If you plan to move sooner, skip the upgrade and put the money toward closing costs.
- ✓ Replace the thermostat at the same time. A smart thermostat ($150-$300) saves 10-23% on heating bills by learning your schedule and adjusting temperature automatically. Most HVAC installers include basic thermostat installation in the furnace replacement quote.
- ✓ Check for utility rebates and federal tax credits. The 25C tax credit covers 30% of high-efficiency heat pumps and some 95%+ AFUE furnaces (up to $2,000). Many gas and electric utilities offer $300-$1,500 rebates on 96%+ AFUE units. Always check your state energy office and utility website before signing a contract.
Disclaimer: This calculator provides estimates for educational purposes only. Actual furnace costs vary based on regional labor rates, ductwork condition, code requirements, equipment availability, and installation complexity. Always get itemized quotes from licensed HVAC contractors and verify efficiency ratings (AFUE), warranty terms, and permit requirements before signing a contract.
Related Tools
A new furnace is one piece of your home’s heating and energy system. These calculators cover the related decisions — from monthly energy costs to ductwork sizing and home efficiency upgrades.
- Home Energy Calculator — estimate monthly electricity and gas bills for any home size and climate.
- Electricity Cost Calculator — compute monthly and annual electricity costs by appliance and rate.
- Thermostat Savings Calculator — see how much a smart thermostat saves on heating and cooling bills.
- Appliance Energy Cost Calculator — estimate yearly operating cost for refrigerators, dryers, and other appliances.
- Insulation Calculator — estimate insulation cost and R-value for attics, walls, and basements.
- Insulation Calculator (Toolzie) — dedicated insulation cost estimator with R-value recommendations by zone.
- Home Maintenance Cost Calculator — budget annual upkeep including furnace tune-ups, filter changes, and inspections.
- Home Insurance Calculator — check coverage needs when upgrading HVAC systems and home equipment.
- Home Renovation Cost Calculator — budget full home updates including HVAC, electrical, and structural work.
- ROI Calculator — compute the return on a high-efficiency furnace upgrade vs ongoing fuel savings.
- EV Charging Cost Calculator — compare charging an EV vs heating with electricity at home utility rates.
- Square Footage Calculator — re-measure your home to confirm furnace sizing inputs are accurate.