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Furnace Replacement Cost in 2026: Repair or Replace, and How to Compare Bids
Updated July 2026 · Reviewed by the United HVAC Motors technical team
Before you replace anything
- Replacement runs $3,000 to $8,000 installed, most homes at $4,500 to $6,500.
- The 50% rule: if a repair exceeds roughly half the cost of a new furnace and the unit is over 15 years old, replace. Below that, repair.
- But confirm the diagnosis first. A furnace that will not heat is sometimes a failed blower motor, an igniter, or a flame sensor — repairs in the hundreds, not thousands. "You need a new furnace" is sometimes a diagnosis and sometimes a sales position.
This guide covers the decision and the project. For equipment pricing, efficiency tiers and sizing, see our new furnace cost guide. For what individual repairs cost, our furnace repair cost guide.
Repair or Replace? Work It Out Properly
The 50% rule is a useful starting point but it is crude on its own. Run these four questions instead:
- How old is it? Furnaces typically run 15 to 20 years. Under 12, repair almost always wins. Over 18, replacement usually does.
- What actually failed? This matters more than age. A cracked heat exchanger is a replacement, full stop — it is a combustion safety issue. A blower motor, igniter, flame sensor, capacitor or control board is a repair, often a modest one.
- What does the repair cost against replacement? The 50% rule: above half the cost of new, on a unit past 15 years, replacement is the better arithmetic. A sharper version some contractors use is to multiply the furnace's age by the repair cost — if that substantially exceeds replacement, replace.
- How many times have you called this year? Two or more service calls in a season on an aging unit is a pattern, not bad luck.
Get the failed component named in writing. "The furnace is shot" is not a diagnosis. Ask which part failed and why. A cracked heat exchanger should be documented — and a second opinion is entirely reasonable, because it is the one finding that converts a repair call into a five-figure conversation.
What the Replacement Job Actually Involves
Replacement differs from a new-build installation in ways that drive cost:
- Removal and disposal of the old unit — $100 to $300
- Retrofit fit — new cabinets rarely match old footprints exactly, so plenum and transition work is common
- Venting conversion — moving from 80% to condensing means abandoning the metal flue for PVC, and if the old furnace shared a chimney with a water heater, that water heater now needs its own solution. This is the single most commonly missed line item in a replacement bid.
- Condensate drainage — new requirement for condensing equipment; a pump if there is no gravity drain
- Gas line sizing — checked against the new BTU rating
- Permits and inspection — required in most jurisdictions
Typical Cost Breakdown
| Line Item | Typical Range |
|---|---|
| Furnace equipment | $1,800 to $5,000 |
| Installation labor | $1,200 to $3,500 |
| Duct modifications (if needed) | $500 to $3,000 |
| Venting conversion | $500 to $2,000 |
| Gas or electrical upgrades | $300 to $2,000 |
| Permits and inspection | $50 to $300 |
| Removal and disposal | $100 to $300 |
How to Compare Bids Without Getting Caught
Three bids on the same house routinely differ by thousands. Usually the scope differs, not the pricing. Check these:
- Was a Manual J load calculation performed? If a contractor sized the unit by matching the old one, they inherited whatever mistake was already there. Ask directly.
- Was static pressure measured? Almost nobody does this, and it determines whether the new system will actually perform. See what ideal static pressure is.
- Is duct modification in the bid or excluded? The cheapest bid usually excludes it, and it reappears mid-job as a change order.
- Does the price include permits?
- What happens to the water heater if the shared chimney is being abandoned?
- What is the labor warranty, separate from the manufacturer's parts warranty?
A bid that is $2,000 cheaper and silent on items 2, 3 and 5 is not cheaper. It is incomplete. And before final payment, ask for the commissioning readings — see what you are paying the installer for.
The Trap: Replacing the Furnace, Keeping the Problem
New equipment installed onto a duct system that was already restricted will underperform, and the homeowner will conclude the new furnace was a bad purchase.
The mechanism is straightforward. High static pressure means the blower fights for air. A modern condensing furnace with a secondary heat exchanger adds still more resistance. The result is uneven heating, high-limit trips, and a blower motor that fails years early — in equipment that is only two years old.
If the previous furnace had comfort complaints, weak airflow in far rooms, or a blower motor that failed young, the ducts are implicated. Replacing the furnace without addressing that carries the problem forward into the new equipment. Details in how long a blower motor should last.
Timing: Replace in the Off-Season If You Can
Emergency replacement in January is the most expensive way to buy a furnace. Contractors are booked, overtime rates apply, and you have no leverage to compare bids while the house is cold.
If your furnace is 15+ years old and showing signs, planning replacement for spring or early fall gives you competitive pricing, contractor availability, and time to get a proper load calculation done. The single largest discount available on a furnace is not negotiating — it is not being desperate.
Rebates and Tax Credits
High-efficiency furnaces have qualified for federal energy-efficiency tax credits and utility rebates in recent years, generally tied to AFUE thresholds. Eligibility rules and amounts change, so confirm current status with the program administrator or your tax advisor before counting on one.
FAQs
How much does furnace replacement cost in 2026?
Typically $3,000 to $8,000 installed, with most homes between $4,500 and $6,500. Equipment is $1,800 to $5,000 of that; the balance is labor, venting, duct work, permits and disposal.
Should I repair or replace my furnace?
The 50% rule: if the repair exceeds roughly half the cost of a new furnace and the unit is over 15 years old, replace. But confirm what actually failed first — a cracked heat exchanger means replacement, while a blower motor, igniter, flame sensor or capacitor is usually an inexpensive repair.
Why are furnace replacement quotes so different?
Scope, not pricing. The cheapest bid typically excludes duct modification, venting conversion, or the water heater solution needed when a shared chimney is abandoned. Those reappear as change orders. Compare line by line.
What is a cracked heat exchanger and does it mean replacement?
It is a breach in the component separating combustion gases from the air you breathe, and yes, it means replacement rather than repair. Because it is also the finding that turns a service call into a large sale, ask for it to be documented and consider a second opinion.
When is the cheapest time to replace a furnace?
Spring or early fall. Emergency replacement in mid-winter is the most expensive scenario, with overtime rates, no contractor availability, and no time to compare bids.
Will a new furnace fix my uneven heating?
Not if the cause is ductwork. New equipment on a restricted duct system inherits the same problem, and a condensing furnace adds resistance on top. Have static pressure measured before assuming the furnace is the fault.
Next Steps
Confirm what failed before accepting a replacement quote. If it turns out to be the blower motor rather than the furnace, a programmed remanufactured motor with a 2-year warranty costs a fraction of a full replacement and ships without the backorder wait. USA-based technical support in English and Spanish.