Should I Repair or Replace My Furnace in Garland, TX

Should I repair or replace my furnace is the question Garland homeowners ask on the first cold night, usually with a repair price on a scrap of paper and no second number next to it. The useful version of the question is narrower. What failed, how old is the furnace, and what does a replacement cost on this house once the vent, the coil, and the permit are included?

This page is that comparison. It is not a brand ranking, and it is not a countdown clock. A cracked igniter is not a new furnace. A cracked heat exchanger is not a repair.

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 reset the alarm and keep the furnace running. Carbon monoxide has no smell. Those cases are not a repair-or-replace spreadsheet. The furnace stays off until it is checked.

Repair these, unless the exchanger is already damaged

A furnace that still heats the house, with a sound heat exchanger and a flue that drafts, is often a repair when the failed part is one of these:

• Hot surface igniter or a standing-pilot thermocouple
• Flame sensor coated after a summer of sitting
• A capacitor or a blower motor that has not taken the heat exchanger with it
• Thermostat batteries, a thermostat that failed, or a setting left on Cool
• A condensate drain or float on a high-efficiency furnace, once the water is kept off the wiring

Igniters crack. Flame sensors coat. That happens on furnaces that sat from spring through a long cooling season, which is a normal Garland year. It does not mean the brand was wrong, and it does not mean the cabinet is done. You should hear the part price before it is replaced.

Ask the technician what the heat exchanger and the flue look like while the furnace is open. A small part on a rusted exchanger is not "just the igniter."

Replace, or at least price a replacement before you approve the repair

• Any age, heat exchanger failed. Cracks, holes, or a combustion test that shows products in the supply air. Leave the furnace off. Do not run it until the new one is installed.
• Soot, a yellow lazy flame, or a flue with holes. That is a safety problem. The age is irrelevant.
• A rusted cabinet or a secondary heat exchanger full of water damage on a condensing furnace. Attic drains that have overflowed for years do this.
• The same major failure twice, or a second expensive repair within a short span, on a furnace already around 15 years old.
• Parts no longer available for the gas valve, the board, or the heat exchanger. A furnace that cannot be repaired safely is a replacement.

The signs list, written for a neighboring city, is signs your furnace needs to be replaced in Grand Prairie. The age question on its own is at what age a furnace should be replaced in Mansfield.

Age is a prompt, not a verdict

The U.S. Department of Energy's Energy Saver guide says to consider replacement when a furnace is more than 15 years old. A Building America guide talks about a 15 to 20 year life. An older Department of Energy fact sheet put an average gas furnace lifetime between about 18 and 20 years. Later field notes found furnaces still running past 20 years when the install and the airflow stayed right.

Garland winters are mild enough that the burners often run fewer hours than a furnace up north. The calendar can run long. The blower does not get that rest. It moves air for the air conditioner all summer. Attic heat, a starved return, and short cycling still wear the heat exchanger. A 15-year-old furnace that heats evenly can be a repair. A 10-year-old furnace with a cracked exchanger cannot.

A Department of Energy contractor guide uses a cost comparison alongside age: if the repair is more than about half the cost of replacement, replacement is the stronger spend. Treat that as a comparison, not a rule. You need both numbers for this house. National bands people use to see whether a bid is in a normal world are in furnace replacement cost in Arlington. They are industry ranges, not a Garland price and not a Boost Air quote. Your price depends on the system, the house, and the equipment.

What changes the replacement number in Garland

Older houses closer to downtown and the historic streets are more likely to have a closet furnace on a metal flue. An 80% furnace can stay on that flue if the flue is sound. Newer sections, including a lot of homes toward Firewheel and north Garland, are more likely to have the furnace in the attic on the cooling coil. A condensing furnace there needs PVC vents and a drain that has to leave the attic without freezing or soaking the ceiling.

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. Buy the furnace this closet or attic can vent. Do not buy a condensing furnace that the house cannot drain.

The coil on top of the furnace has to be named in the quote. If it comes apart and goes back, say so. If it is replaced, the refrigerant system has to be pressure tested, evacuated, and charged. That charge is part of install quality, along with sizing, ductwork, airflow, and the permit. The brand is not a substitute for any of those.

Furnace installation and replacement should spell out the vent, the size, and what happens to the coil before you approve it.

How to compare the two prices

Write three lines before you decide:

• Age of the furnace, from the rating plate, not from memory
• The part that failed, and the repair price after someone has seen it
• A replacement price that includes venting, permit, haul-away, thermostat, and a sentence about the coil and the ducts

A repair that is a large share of a replacement on an old furnace is worth seeing side by side. A repair that is a small part on a younger furnace with a sound exchanger is a repair. Ask what the labor coverage is, in writing, separate from the manufacturer parts coverage.

If a replacement bid is far under the others, look for a missing flue, a missing permit, or a furnace that is too large for the house. A low number that skips the vent repeats the short life you are trying to end.

HVAC service in Garland is where we look at the furnace you have before writing either number.

Free replacement estimates

Talk with a knowledgeable North Texas comfort advisor about your replacement options. Free estimates, no pressure. A furnace that only needs a part is still a repair, quoted on its own, before anyone talks you into a cabinet.

Boost Air And Plumbing installs gas and electric furnaces in Garland, Arlington, Grand Prairie, Fort Worth, and nearby communities. We do not install boilers. See our furnace installation and replacement service and HVAC service in Garland. 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

Should I repair or replace my furnace? Repair a straightforward part on a furnace that still heats evenly and has a sound heat exchanger, a sound cabinet, and a flue that drafts. Replace when the heat exchanger has failed, the cabinet or flue is rusted through, or an older furnace needs another major repair. Get both prices after someone has seen the furnace. Age starts the question. It does not finish it.

Is a 15-year-old furnace in Garland finished? No. The U.S. Department of Energy's Energy Saver guide lists a furnace more than 15 years old as one reason to consider replacement. It is a prompt, not an expiration date. A 15-year-old furnace that needs an igniter or a flame sensor can still be worth repairing. A younger furnace with a cracked heat exchanger is not.

Does the half-cost rule mean I should replace it? A Department of Energy contractor guide treats a repair that costs more than about half of a replacement, on an old furnace, as a reason to price the replacement first. Use it as a comparison, not a rule. A six-year-old furnace with a failed igniter is still a repair. You need the repair price and a replacement price for this house, not a national average alone.

What failures are not a repair? A cracked heat exchanger, soot, a yellow flame, a gas smell, or a carbon monoxide alarm. Leave that furnace off. If you smell gas, leave the home and call the gas utility or 911 from outside. If an alarm sounds, get everyone out and call 911. Do not reset it and keep heating.

Does the brand decide whether to repair or replace? No. Sizing, ductwork, airflow, venting, and commissioning matter more than the name on the cabinet. A correctly sized furnace with open returns and a flue that drafts will outlast a premium furnace that was oversized and starved of air. If the coil is opened on the replacement, the refrigerant charge has to be right too.