Furnace Replacement Cost

Updated 2026 · National average (USD)

Typical cost range

$3,000 – $7,600

Most homeowners pay around $4,700

Installed gas furnace, typical home. High-efficiency and electric/oil systems vary.

Replacing a furnace typically costs between $3,000 and $7,600, installed. Gas furnaces are the most common; the price depends on the unit’s heating capacity (BTU), efficiency (AFUE rating), and the complexity of the install. Use the size calculator below to estimate the heating BTU your home needs.

Furnace cost by efficiency

Item	Typical cost
Standard efficiency (80% AFUE)	$3,000 – $5,000
High efficiency (90–97% AFUE) Lower running cost	$4,500 – $7,600
Electric furnace Lower upfront, higher running cost	$2,000 – $4,500
Oil furnace	$4,500 – $8,000

What affects the cost

Fuel type — gas, electric and oil differ in both upfront and running cost.
AFUE efficiency — a 96% unit wastes far less fuel than an 80% unit over its life.
Heating capacity (BTU) — bigger homes and colder climates need more output.
Venting and gas-line changes can add to a high-efficiency install.

What Size AC & Furnace Do You Need?

Your local climate changes the heating and cooling load for your home. This estimate uses a national mixed baseline — for a location-specific result, open your state page. Enter your details for a quick sizing estimate (BTU, tonnage and a recommended SEER2 range).

Home size (sq ft) Ceiling height Sun exposure People in home

Your estimated AC tonnage and furnace size will appear here.

Actual equipment sizing requires a professional Manual J load calculation. This tool provides a rough estimate for general informational purposes only and is not professional advice, a guarantee, or a quote. Results may not reflect your specific situation. Always confirm with a licensed HVAC professional before making any purchase or decision. See our Terms of Service for details.

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Frequently Asked Questions

How long does a furnace last?

A well-maintained gas furnace typically lasts 15–20 years. Once it passes 15 years and needs a major repair, replacement is often the smarter investment.

Is a high-efficiency furnace worth it?

In cold climates with long heating seasons, a 95%+ AFUE furnace can save meaningfully on fuel. In milder regions the payback is longer, so match the efficiency to your climate and how long you’ll stay.

What size furnace do I need?

Furnace sizing depends on home size, climate and insulation — roughly 30–60 BTU per square foot depending on your climate zone. Use the calculator on this page for an estimate.

Related cost guides

HVAC System Replacement Cost $7,000+ AC Installation & Replacement Cost $3,900+

Cost figures are national average estimates for 2026 and vary by region, brand, equipment efficiency and labor rates. This guide is informational, not a quote — always confirm with a licensed contractor.