Furnace Replacement Cost in Mansfield, TX

Mansfield furnace quotes split in a predictable way. One is an 80% furnace in a hall closet, on the metal flue that is already there. Another is a high-efficiency furnace in an attic, with new plastic vents and a drain that has to cross a hot attic and get outside. Both are called a furnace replacement. The furnace replacement cost in Mansfield is the difference between those scopes.

The dollar figures below come from national cost guides. They are not a Mansfield 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. Carbon monoxide has no smell.

Smoke, a hot-plastic smell, or a breaker that will not stay on means the furnace stays off. Reset a breaker once. If it trips again, leave it off. Do not open the burner cover or the electrical compartment. A cracked heat exchanger is a safety problem. 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" pages disagree. A gas furnace in a Mansfield attic is usually the higher conversation.

An electric furnace is different equipment and is often quoted lower than gas. Most Mansfield houses that already have gas stay with gas. Changing fuels is its own quote, because the flue, the gas line, or the electrical panel has to change with it.

The same national bands are written up for neighboring cities in furnace replacement cost in Arlington, furnace replacement cost in Fort Worth, and furnace replacement cost in Plano. Use them to see whether a bid is missing half the job. Get your number after someone has looked at the furnace, the flue, and the coil.

Whether the furnace is old enough to replace at all is a different question. At what age a furnace should be replaced in Mansfield stays on that. This page is the quote.

Attic job or closet job

A lot of Mansfield houses built from the 1990s on put the furnace in the attic, sitting on the evaporator coil. The blower already ran all summer for the air conditioner. The burners may not have run since the last cold week. When the furnace is replaced, the coil has to come apart and go back, or the quote has to say the coil is being replaced. A bid that is silent on the coil is not finished.

Older houses, often closer in, are more likely to have a furnace in a hall closet with a short metal flue. That job can stay an 80% furnace if the flue is sound. It is still not a "swap the box" price until someone looks at the gas connector, the electrical, and the return air.

Lines that move the total:

• 80% versus about 90% and up. An 80% furnace vents through metal. A condensing furnace makes water and needs PVC intake and exhaust plus a drain. In an attic, that pipe run and a drain you can trust are often a larger part of the price than the step up in efficiency. A drain that can freeze on a hard North Texas night, or overflow onto the ceiling, belongs in the plan before you approve it.
• Size. The old BTU number is not a load calculation. An oversized furnace heats the thermostat and shuts off. Size it to the house.
• Ducts and the return. A starved return trips the limit switch. HomeAdvisor cites about $1,000 to $2,700 for ductwork in its HVAC tables. Heavier trunk work costs more. Ask for that as its own line if the ducts need it.
• Permit and haul-away. The city's permit fee belongs on the quote, with the contractor who pulls it named. So does removal of the old furnace.

What to compare before you look at the bottom number

• 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

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 in this attic or closet. Stay with 80% when a condensing install means a drain you cannot trust. Furnace installation and replacement should name the vent material before you approve it.

The install matters more than the brand

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.

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 an unfinished job.

HVAC service in Mansfield 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 Mansfield, Arlington, Grand Prairie, Fort Worth, and nearby communities. We do not install boilers. See our furnace installation and replacement service and HVAC service in Mansfield. 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 Mansfield? 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 Mansfield price and not a Boost Air quote. Your price depends on the system, the house, and the install.

Why is an attic furnace in Mansfield often a different quote than a closet furnace? A lot of newer Mansfield houses put the furnace in the attic, on the cooling coil. A condensing furnace needs plastic intake and exhaust pipes and a condensate drain that has to leave that attic. An older closet furnace on a short metal flue can stay an 80% furnace with less pipe work. The box price is not the job. The quote should say which one it is.

Do I have to replace the air conditioner with the furnace? No. If the cooling system is sound, ask for a furnace-only price that says what happens to the coil when the furnace comes out. Replace the cooling equipment when it is failing, when the coil has to change for a new refrigerant, or when you are switching to a heat pump. Those are different quotes.

Is an 80% furnace still allowed? Yes, for equipment made under the current federal minimum of 80% AFUE. An 80% furnace uses a metal flue. A furnace around 90% or higher needs PVC vents and a drain. 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. Buy the furnace this attic or closet can vent safely.

Does the brand decide how long the new furnace lasts? No. Sizing, return air, and a flue that drafts matter more than the name on the cabinet. A correctly sized furnace with a clean filter and a vent that was finished on install day 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.