Furnace Replacement Cost in Fort Worth, TX

Fort Worth furnace quotes show up the week a cold front finally makes the house uncomfortable. One bid is an 80% furnace in the same closet, on the same metal flue. Another is a 96% furnace with new plastic vents run across an attic. Both say "furnace replacement." They are not the same job, and the furnace replacement cost in Fort Worth is the difference between those scopes, not a single citywide number.

The dollar figures below come from national cost guides. They are not a Fort Worth price, and they are not a Boost Air quote. The price you pay depends on the system, the house, and the install.

If you smell gas (a rotten egg odor), stop here. Do not flip switches or use a phone inside. Leave the home and call your gas utility or 911 from outside. If a carbon monoxide alarm sounds, or anyone has a headache, nausea, or dizziness that eases outdoors, get everyone out and call 911. Do not shop for a furnace while a gas smell is in the house.

Smoke, hot plastic, or a breaker that will not stay on means the furnace stays off. A cracked heat exchanger is a safety problem, not a negotiating point. Leave that furnace off until it is checked.

What national guides say a furnace costs in 2026

For a gas furnace, Angi and HomeAdvisor put most installed replacements between about $3,800 and $10,000. Angi reported a national average around $7,000 for a house in the 1,600 to 2,000 square foot range. High-efficiency models are often quoted higher. Published figures for those sometimes reach about $12,000.

A wider Angi range that mixes every fuel type, including smaller and simpler jobs, sits lower, roughly $2,800 to $6,900, with an average near $4,800. That lower band is why two "average furnace cost" articles disagree. Gas equipment in a North Texas attic is the higher of those conversations more often than the lower one.

An electric furnace is a different piece of equipment and is often quoted lower than gas. Most Fort Worth houses that already have gas stay with gas. Switching fuels means a flue question, a gas line question, or a panel question, and it should be its own quote.

The same national bands are walked through for a neighboring city in furnace replacement cost in Arlington. Use them to spot a bid that is missing half the job. Get your number after someone has looked at the furnace, the flue, and the coil above it.

What the quote should include

A furnace-only replacement on a typical Fort Worth house includes the furnace, the labor to set it, the vent connection, the gas connection, the electrical, the thermostat setup, haul-away, and the permit. If the evaporator coil sits on top of the furnace, the quote should say whether that coil comes apart and goes back, or whether it is being replaced.

Lines that change the total:

• 80% versus 90% and up. An 80% furnace uses a metal flue, common in older close-in Fort Worth closets. A condensing furnace (about 90% AFUE and higher) uses PVC vents and makes water that has to drain. In an attic, common on newer houses toward the edges of the city, that pipe run and drain can cost more than the difference in the box.
• Size. The old unit's BTU number is not a load calculation. An oversized furnace heats the thermostat and shuts off. Size it to the house.
• The coil and the air conditioner. If cooling is staying, the new furnace still has to fit the coil. If the air conditioner is failing, ask for a second price. Signs your furnace needs to be replaced is the failure list. At what age a furnace should be replaced is the age question.
• Ducts, a heat pump, and the permit. A starved return will trip the limit switch. HomeAdvisor cites about $1,000 to $2,700 for ductwork in its HVAC tables. Heavier trunk work costs more. A heat pump is a different system when both halves are due, and the panel has to support it. Fort Worth's permit fee belongs on the quote, with the contractor who pulls it named.

80% or high efficiency, in this house

Both are still sold. The current federal minimum is 80% AFUE. A rule on the books would raise that to 95% for furnaces manufactured on or after December 18, 2028, and that date has been under review. Choose the condensing furnace when the vent and the drain are practical. Stay with 80% when a condensing install means a drain you cannot trust in an attic. Furnace installation and replacement should name the vent material before you approve it.

The heat exchanger cares about airflow, a flue that drafts, and a size that does not short cycle. A premium cabinet on a clogged return will have a shorter life than a plain furnace installed with those items done right. Ask how the BTU size was chosen. Commissioning, meaning gas pressure, temperature rise, and a combustion check, is part of the price. A cracked heat exchanger ends the repair path. Leave that furnace off.

How to compare the bids

• Input and output BTUs, and why that size
• AFUE, and whether the flue stays metal or becomes PVC
• Where the intake, exhaust, and condensate go, if it is a condensing model
• What happens to the evaporator coil
• Gas connector, shutoff, and electrical
• Thermostat: reused or replaced
• Duct notes, even if the note is "ducts are adequate"
• Permit and haul-away
• Labor coverage in writing, separate from the manufacturer parts coverage

If a bid is far under the others, look for a missing flue, a missing permit, or a furnace that is simply too large. A low number that skips the vent is not the inexpensive one. It is an unfinished one.

HVAC service in Fort Worth is where we look at the furnace, the flue, and the coil before writing a number.

Free replacement estimates

Talk with a knowledgeable North Texas comfort advisor about your replacement options. Free estimates, no pressure.

Boost Air And Plumbing installs gas and electric furnaces in Fort Worth, Arlington, Grand Prairie, Mansfield, Dallas, and nearby communities. We do not install boilers. See our furnace installation and replacement service and HVAC service in Fort Worth. Call (817) 612-9107 or book online. Hours are Monday through Saturday, 8am to 7pm, with after-hours and Sunday emergency appointments available.

Frequently asked questions

How much does furnace replacement cost in Fort Worth? National guides updated for 2026, including Angi and HomeAdvisor, put most gas furnace replacements between about $3,800 and $10,000 installed. Angi reported a national average around $7,000 for a mid-size house, and high-efficiency models are often quoted higher, sometimes toward $12,000. A separate Angi range that mixes all fuel types sits lower, roughly $2,800 to $6,900. These are national industry ranges, not a Fort Worth price and not a Boost Air quote. Your price depends on the system, the house, and the install.

Why do two Fort Worth furnace quotes look so different? One may be an 80% furnace on the existing metal flue. The other may be a condensing furnace with new plastic vents and a condensate drain, often a longer job in an attic than in a hallway closet. Size, the evaporator coil, duct repairs, the permit, and haul-away all move the total. Match the lines before you match the number at the bottom.

Is an 80% furnace still an option? Yes, for equipment made under the current federal minimum. An 80% furnace vents through a metal flue. A 90% or higher furnace needs plastic intake and exhaust pipes and a condensate drain. The higher-efficiency unit is not automatically the better buy if the attic or the closet cannot take that venting without a much larger job. A rule on the books would raise the minimum for furnaces manufactured on or after December 18, 2028, and that date has been under review.

Do I have to replace the air conditioner with the furnace? No. Many jobs replace the furnace and leave a sound air conditioner in place. Replace the cooling equipment when it is failing, when the coil has to change to match a new refrigerant, or when you are switching to a heat pump. Ask for the furnace-only price next to a full-system price.

Does a cheaper furnace last longer if the install is careful? Install quality matters more than the badge. A correctly sized furnace with enough return air, a flue that drafts, and a clean commission will outlast a premium furnace that was oversized and starved of air. Ask how the BTU size was chosen, and get the labor coverage in writing, separate from the manufacturer parts coverage.