Furnace Replacement Cost in Plano, TX

Plano furnace quotes split along the house, not along a single city price. An older one-story closer to the east side of town is often a closet furnace on a short metal flue. A two-story in west Plano, or a later house with the equipment in the attic, is often a furnace sitting on the cooling coil, with a drain and a vent path that have to be rebuilt if you step up to a condensing model. Both are called a furnace replacement. The furnace replacement cost in Plano is the difference between those scopes.

The dollar figures below come from national cost guides. They are not a Plano 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 Plano attic, with a new vent and a coil to reconnect, is usually the higher conversation.

An electric furnace is different equipment and is often quoted lower than gas. Most Plano 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, written for a neighboring city, are in furnace replacement cost in Mansfield. Use them to see whether a bid is missing half the job. Whether this furnace is old enough to replace at all is how long a furnace lasts in Plano. If you are still deciding whether the repair in front of you is the better spend, should I repair or replace my furnace in Garland is that comparison. None of those is a Plano price list.

Closet flue or attic condensing job

Older Plano houses, and a lot of one-story homes, put the furnace in a hall closet with a metal flue that rises a short distance. If that flue is sound, an 80% furnace can stay on it. The quote still has to look at the gas connector, the electrical, the return air, and whether the evaporator coil has to come off and go back on.

Later houses, including many two-story plans, put the furnace in the attic on top of the cooling coil. The blower already ran all summer. The burners may not have run since the last cold week. Replacing that furnace means the coil comes apart and goes back, or the quote says the coil is being replaced. A bid that never mentions the coil is not finished. A condensing furnace in that attic also needs PVC intake and exhaust and a condensate drain that has to get outside without freezing on a hard night or overflowing onto the ceiling.

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 pipes 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.
• Size. The old BTU number is not a load calculation. Plano houses vary a lot: a compact one-story and a tall two-story with a lot of glass are not the same load. 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. Two-story houses often have a weak return upstairs or a trunk that was adequate for the original blower and is tight for a new one. 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.
• The coil and the refrigerant. If the cooling coil is opened or replaced, the system has to be pressure tested, evacuated, and charged for the refrigerant that equipment uses. That is part of the job, not a favor. A furnace swap that leaves the lines open and "tops off" the charge is how the air conditioner dies the next summer.
• Permit and haul-away. The city's permit fee belongs on the quote, with the contractor who pulls it named. Confirm Plano's current rule when the bid is written. 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, and the refrigerant charge if the system is opened
• 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. Sizing, ductwork, airflow, and a permit with a real combustion check matter more than the name on the door. If the coil was opened, the refrigerant charge belongs on that same list. Ask how the BTU size was chosen. Commissioning means gas pressure, temperature rise, and a combustion check. It is part of the price.

If a bid is far under the others, look for a missing flue, a missing permit, a coil nobody mentioned, or a furnace that is simply too large. A low number that skips the vent is an unfinished job.

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

Why do two Plano furnace quotes look so different? One may be an 80% furnace on an existing metal flue in a closet. Another may be a condensing furnace in an attic, with new PVC vents, a condensate drain, a coil that has to come apart, and duct repairs. The box price is not the job. A bid that is silent on the flue, the coil, and the permit is not the same scope as one that lists them.

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 in Plano? 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. Confirm the city's current permit rules with the contractor who will pull the permit.

Does the brand decide how long the new furnace lasts? No. Sizing, ductwork, airflow, a flue that drafts, and the permit and commissioning matter more than the name on the cabinet. If the coil is opened, the refrigerant charge has to be done correctly too. A correctly sized furnace with a clean return and a finished vent will outlast a premium furnace that was oversized and starved of air.