Furnace Replacement Cost Calculator — Free Estimator
This furnace replacement cost calculator estimates what a new furnace costs to install — gas, electric, oil, or propane — adjusted for size in BTU, AFUE efficiency tier, whether it's a straight replacement or a new install, and your local labor market. Use it to budget a furnace replacement before you collect quotes, or to sanity-check the prices you already have.
Replacing the AC too? A combined system is cheaper than two jobs — price the whole thing with the HVAC Replacement Cost Calculator.
Describe the furnace job
Estimated installed cost
Typical mid-point
$5,000
If 95% AFUE
$6,100
See the breakdown
National 2026 ballparks for budgeting — furnace, labor, venting, and permit included. Your local line-item quotes are the real number; use this to sanity-check them.
Typical furnace replacement costs (quick reference)
National installed-price ranges for a standard-efficiency (80% AFUE) furnace, straight replacement. High-efficiency 95%+ condensing models add roughly 20–25%.
| Furnace type | Low | Typical | High |
|---|---|---|---|
| Gas furnace | $3,000 | $5,000 | $7,500 |
| Electric furnace | $2,000 | $3,500 | $5,500 |
| Propane (LP) furnace | $3,500 | $5,500 | $8,000 |
| Oil furnace | $5,000 | $6,800 | $10,000 |
| High-efficiency (95%+) add | +15% | +22% | +25% |
Ranges reflect typical 2026 national pricing for residential jobs and vary by brand, region, and site conditions. Always compare multiple line-item quotes.
The formula, explained in plain English
Furnace pricing is a base price for the fuel type, scaled by size and efficiency, then adjusted for a new install versus a replacement and your local labor rates.
Why fuel type sets the base
Electric furnaces are simplest and cheapest to install; oil furnaces cost the most up front. Gas sits in the middle and is the most common replacement.
Why 95% AFUE adds ~22%
Condensing furnaces add a secondary heat exchanger and require PVC venting plus a condensate drain — more equipment and labor, repaid through lower gas bills.
Why size barely moves the price
A 100,000 BTU furnace costs only a little more than a 60,000 BTU one — labor is the same, so the size factor spans just 0.9–1.15.
Don't forget rebates
High-efficiency gas furnaces often qualify for utility rebates and federal tax credits that claw back part of the efficiency premium.
Frequently asked questions
Common questions about furnace replacement pricing.
How much does it cost to replace a furnace?
A new furnace typically runs $3,500 to $7,500 installed for a standard gas unit, with about $5,000 as a national mid-point. Electric furnaces are cheaper to install (~$3,500), while oil and high-efficiency condensing gas furnaces run higher.
How much does a high-efficiency furnace cost?
A 95–98% AFUE condensing gas furnace costs roughly 20–25% more than an 80% model — typically $6,000 to $9,000 installed — because it adds a secondary heat exchanger and needs new PVC venting and a condensate drain. Utility rebates and tax credits often offset part of the premium.
Is it cheaper to replace the furnace and AC together?
Yes. Replacing both at once shares the labor, permit, and startup visit, so a combined system costs less than two separate jobs. Price the full system or AC side with the HVAC Replacement Cost Calculator.
What size furnace do I need, and does size change the price?
Furnaces are sized in BTU input — most homes need 60,000 to 100,000 BTU. Bigger units cost a bit more, but labor dominates, so the size factor only spans about 0.9–1.15. Size it properly with the Furnace BTU Calculator before buying.
Should I repair or replace my furnace?
Replace if the furnace is over 15–20 years old, the heat exchanger is cracked, or repairs exceed about a third of replacement cost. A one-off igniter or flame sensor on a younger unit is worth repairing; repeated failures on an old furnace are money better spent on a new one.
Why is a new-install furnace more expensive than a replacement?
A straight replacement reuses the existing gas line, venting, ducts, and electrical. A first-time or relocated install adds gas-line and venting runs, a new flue or PVC, and electrical work — which is why this calculator adds about 15% for a new install versus a like-for-like swap.
Quoting a furnace swap? Price it line by line in seconds.
This page gives homeowners a budget — TradesQuote gives contractors the winning quote. Describe the furnace job or upload photos, and our AI builds a line-item estimate: equipment, labor, venting, gas, and disposal, with quantities and unit prices validated by a built-in quality control agent.
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