Furnace Replacement Cost - What It Actually Costs, Quoted Free

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How Much Does Furnace Replacement Cost in Marietta?

Furnace replacement in Marietta, GA typically costs between $4,200 and $8,900 for a standard single-family home in 2026, with most homeowners landing around $5,500 to $6,800 for a mid-efficiency unit with full installation. High-efficiency models (90%+ AFUE) run $7,000 to $12,000 or more depending on brand, home size, and ductwork condition. The final price always includes equipment, labor, permits, and disposal of your old furnace, and Brandt HVAC Co Marietta gives you a written price before any work begins, so you never get surprised by add-ons at the end of the job.

Before we get into the numbers, know this: a furnace replacement in Marietta is one of the most important purchases you’ll make for your home. It affects your comfort for the next 15 to 20 years, your monthly energy bills starting immediately, and your safety every winter night. Getting the price right matters, but getting the installation right matters more. A $5,000 furnace installed poorly will cost more over a decade than an $8,000 furnace installed correctly. We’ll explain both sides of that equation below.

You can also read our full Furnace Replacement in Marietta guide for more detail on equipment selection, timeline, and what to expect during installation. And if you want to skip straight to a real number for your specific home, call (478) 662-5175 for a free estimate, a live person answers 24/7.

Key Takeaways: Furnace Replacement Cost in Marietta

• Typical total cost: $4,200 to $8,900 for most single-family homes in Marietta.
• Mid-range system (80% AFUE): $4,200 to $5,900 installed, the most common choice for homes under 2,500 square feet.
• High-efficiency system (90-97% AFUE): $5,900 to $12,000 installed, pays back over time through lower monthly gas bills.
• Time to install: one full day for a swap-out, two days if ductwork modifications are needed.
• Biggest cost drivers: furnace size (BTU output), efficiency rating, brand, home square footage, and whether your ducts or venting need changes.
• Biggest hidden costs: gas line upgrades, electrical panel work, old duct sealing, and permit fees, all given to you in writing upfront by Brandt HVAC.
• Free estimates: Brandt HVAC Co Marietta provides a free quote with a written price before any work starts. Call (478) 662-5175.

Furnace Replacement Cost Breakdown in Marietta (2026)

Here is the line-item breakdown for what a furnace replacement actually costs in Marietta. These ranges reflect actual 2026 market pricing in Cobb County, including local permit fees and typical labor rates. Use this as a reality check when you compare bids.

Total installed cost in Marietta: most homes fall between $4,200 and $8,900, with the sweet spot around $5,500 to $6,800 for a 2,000 to 2,500 square foot house with a mid-efficiency or entry-level high-efficiency furnace.

One thing we hear all the time: “Why does the same furnace cost different amounts from different companies?” The short answer is labor quality and process. A low bid often means the crew is paid piece-rate, so they rush. When a crew rushes, they skip steps: no nitrogen purge during brazing, no combustion analysis after startup, no static pressure check on the ductwork. Those skipped steps shorten the life of your furnace and raise your monthly bills. Brandt HVAC Co Marietta charges a labor rate that reflects careful work and a written guarantee on every replacement, no exceptions on the quality of the install.

What Affects Furnace Replacement Pricing in Marietta

Marietta’s housing stock spans 1950s ranch homes near the Square, 1970s and 1980s subdivisions off Powder Springs Road, and newer construction up toward Kennesaw and East Cobb. Each era of home brings different furnace replacement variables. Here’s what changes your final number:

• Home size and square footage. A 1,200 square foot ranch near Marietta Square needs a 40,000 to 60,000 BTU furnace. A 3,500 square foot home in East Cobb might need 100,000 to 120,000 BTUs. Larger furnaces cost more for the unit itself, and they typically require larger gas lines and more ductwork.
• Furnace efficiency rating (AFUE). An 80% AFUE furnace is the least expensive up front, but a 96% AFUE unit costs about $1,500 to $3,000 more and cuts your gas consumption by 16% or more every winter. Many Marietta homeowners with older drafty homes lean toward higher efficiency because our heating season runs from November through March, giving you five months of savings every year.
• Brand and equipment tier. Goodman and Rheem sit on the value end, Bryant and York in the middle, and Carrier, Trane, Lennox, and American Standard on the premium side. We install every major brand and will tell you honestly where the value is for your budget and your house. Our service team maintains Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard, so you’ll never be stuck with a unit no one can source parts for.
• Venting configuration. Older Marietta homes often have a metal flue through the roof shared with a gas water heater. Switching to a high-efficiency furnace usually means running new PVC vent pipes out a side wall. If the old metal flue is shared, the water heater may need a new vent too. That’s typically $800 to $2,000 in additional work.
• Ductwork condition. Homes from the 1960s and 1970s in neighborhoods like Sherwood Forest or Whitlock Heights often have undersized or leaky ducts, and a new furnace will reveal it fast. If we measure static pressure and find a restriction, sealing or replacing sections of ductwork might add $500 to $2,500 to the job. We’ll show you the numbers before you decide, not after.
• Access and crawlspace conditions. Furnaces in tight attics or damp crawlspaces take longer to remove and replace. Crawlspace work in particular is slower when we need to lay down protections for the vapor barrier and run new wiring through joist spaces. It’s not a huge swing, usually $150 to $400, but it’s real.

Furnace Replacement vs. Furnace Repair: Which One Makes Sense in Marietta?

This is the question that sent you looking for a price guide in the first place. The rule of thumb we give our Marietta customers: if your furnace is over 15 years old and the repair is more than one-third the cost of a new unit, replacement wins every time. A 18-year-old Carrier with a cracked heat exchanger is not worth a $1,800 repair when a full replacement is $5,500. A 12-year-old Rheem with a $200 ignitor failure is absolutely worth repairing.

Furnace repair in Marietta typically runs $150 to $700 depending on the part. Common repairs like ignitors, flame sensors, limit switches, and pressure switches usually land in the $150 to $350 range. A blower motor replacement can run $450 to $700, and a heat exchanger, if it’s even still under warranty, can push past $1,500 with labor. When the repair quotes start piling up on an old unit, we’ll give you our honest recommendation, and that recommendation is never based on commission. Our technicians are paid to fix things correctly, not to sell you a furnace you don’t need.

Here is the simple math from our years of service in Cobb County: a $5,500 furnace lasts 15 to 20 years. That’s $275 to $365 per year of heat. Spending $400 every winter on repairs for a dying 17-year-old furnace costs more per year and leaves you with a unit that could fail on the coldest night of January. Sometimes thrift is expensive. We’ll give you the facts and let you decide.

How to Save on Furnace Replacement in Marietta Without Cutting Corners

Some ways to save money on a furnace replacement are smart. Others are traps. Here’s the difference, based on what we’ve seen across hundreds of Marietta installs.

• Replace during the off-season. HVAC companies in Cobb County are slammed from October through February. If you can schedule replacement in March, April, September, or October, you’ll sometimes find more flexibility on scheduling and occasionally better pricing on equipment from distributors clearing inventory before model changes. The savings are modest, $100 to $300 on average, but real.
• Get a written quote with line items. We’re not subtle about this because it’s the single biggest money-saver in HVAC: a written line-item price stops surprise fees before they happen. Brandt HVAC Co Marietta gives you a written price before any work starts, on every single job, no exceptions. That’s not a promo, that’s our operating policy and has been since we opened our doors in 2003.
• Don’t oversize the furnace. Many older Marietta homes were deliberately fitted with oversized furnaces because the old units were inefficient and the ducts leaked. Modern furnaces need to be sized properly using a Manual J load calculation, which accounts for your windows, insulation, ceiling height, and exposure. A properly sized furnace costs less to buy and less to run. We run load calculations on every replacement we install, and we’ll show you the math.
• Check for utility rebates and manufacturer promotions. Georgia Power and Atlanta Gas Light periodically offer rebates for high-efficiency gas furnaces, and manufacturers like Carrier, Trane, and Lennox run seasonal promotions. We’ll check what’s active when you call, but do not let a rebate drive you into a purchase that doesn’t fit your home.
• Use the free estimate to plan, not to pressure-shop. A free estimate is exactly that: free information. Call (478) 662-5175, we’ll walk your home, answer your questions straight, and hand you a written price. Take your time with the decision. A furnace replacement is a 15-to-20-year investment, not a race.

How We Price Furnace Replacement at Brandt HVAC Co Marietta

The way most HVAC companies price furnaces is opaque, and that opacity is where homeowners get burned. Pricing by the hour with a vague “plus parts” upcharge gives you no control, and package pricing with hidden margins on equipment gives you no clarity. We do it differently.

Every Brandt HVAC furnace replacement in Marietta gets a written, line-itemed price before any work starts. That includes the exact furnace model and AFUE, labor, permits, venting, gas connections, thermostat, and disposal. You see every dollar. If anything changes during the job, we tell you before it changes, and you approve it in writing before we do the work.

Every replacement includes a written guarantee covering the full installation for 365 days under our 365-Day Done Right Promise. If anything about the installation fails during that year, we return at no charge, no argument, no fine print. And if you’ve had a repair from us that fails within that same guarantee window, the return visit is on us too. That’s our standard for every customer, every time.

We’re also not in the business of sending faceless crews to your door. Every technician we send is background-checked and identity-verified under the Threshold Verified standard, and we send you their name and photo before they arrive. At the door, they show a photo ID badge. If the person standing there isn’t the person we told you to expect, that visit is on us and we make it right. We’ve worked this way since we opened as part of the Threshold Group family of home-service companies, and it’s the reason homeowners in Marietta who care about who enters their home call us.

Devin Marlowe, who leads our Marietta team, puts it simply: our job is to make sure you’re never guessing, whether it’s about the price or the person at the door. That’s the whole promise in one sentence.

If you want to understand the replacement process step by step, visit our home page for a full overview of how we work, or jump straight to our Furnace Replacement in Marietta guide for the timeline and what to expect on installation day.

What to Check Before You Replace: Furnace Replacement in Marietta Step by Step

Here is the exact process we follow on every replacement in Marietta, so you know what to expect and what questions to ask any contractor:

1. Schedule a free in-home assessment. Call (478) 662-5175. We’ll set a time that works for you, send you the name and photo of the technician who’ll arrive, and have them show up in uniform with a photo ID badge. They’ll inspect your current furnace, measure your home, and note any ductwork or venting issues.
2. Review the written quote together. We hand you a line-itemed price with equipment options at different efficiency levels. No pressure, no same-day discount games. You take the time you need.
3. Confirm scheduling and permit details. Once you approve, we handle the Cobb County and City of Marietta permit paperwork for you. We’ll tell you the exact installation date and the name of the lead installer before the day arrives.
4. Installation day: removal and setup. Our team arrives on time, protects your floors and walkways, disconnects the old furnace, and carefully removes it. The new furnace goes in, gas connections are made and leak-tested, and venting is installed to code.
5. Startup, testing, and combustion analysis. We don’t just fire it up and walk away. We run a full startup sequence: gas pressure check, combustion analysis, temperature rise measurement, and static pressure test. If the numbers aren’t right, we adjust until they are.
6. Walkthrough and documentation. We show you the new system, how the thermostat works, and where the filter is. We hand you your written guarantee, your permit sign-off, and the warranty paperwork from the manufacturer.
7. Follow-up after install. We’ll check in after your first cold stretch. If anything about the system doesn’t feel right, or you have questions, we come back. That’s the 365-Day Done Right Promise in action.

Marietta-Specific Furnace Replacement Considerations

Marietta has its own quirks when it comes to furnace replacement, and we’ve learned them over two decades of working in Cobb County.

First, the age of the housing stock. Homes near the Marietta Square and in neighborhoods like Whitlock Heights, Seminole Hills, and Church Street date from the 1920s through the 1950s. Many have had three or four heating systems installed over the decades, and the ductwork is often a patchwork of eras. Before we install a new furnace in an older Marietta home, we always check for asbestos wrap on old ducts (common in pre-1970s construction) and verify the electrical service is adequate for a modern furnace with an ECM blower motor.

Second, humidity. Marietta’s summers are humid, and a furnace with a variable-speed blower moves air more gently and for longer cycles, which helps your AC dehumidify better in July. If you’re replacing a furnace, choosing a variable-speed blower motor isn’t an add-on luxury, it’s a comfort decision that pays off every summer.

Third, gas line size. Older homes in Marietta often have 1/2-inch gas lines sized for a 60,000 BTU furnace and a stove. A modern 100,000 BTU high-efficiency furnace may need a 3/4-inch line from the meter. That’s the $200 to $700 line item in our cost table above. If your house is from the 1960s or earlier and you’re upsizing the furnace, budget for it.

Fourth, crawlspaces. Many Marietta homes are slab-on-grade or have shallow crawlspaces. Crawlspace installs require careful routing of the condensate drain line and, for high-efficiency units, freeze protection on that line. We’ve seen too many horizontal units in Marietta crawlspaces with drains that freeze during a January cold snap. It’s a small detail, installed correctly by someone who knows what a Marietta winter can do, that saves you a flooded crawlspace and a dead furnace when the temperature drops below 20 degrees.

Finally, permits. Marietta requires mechanical permits for furnace replacement, and the inspection ensures the work meets city code. Some contractors skip permitting to save $200 and the hassle of scheduling an inspection, but skipping permit means skipping the independent verification that your gas furnace was installed safely. We don’t skip it, ever. A gas furnace is a combustion appliance in your home, and the safety margin comes from correct installation verified by an inspector.

Is It Cheaper to Repair or Replace a Furnace in Marietta?

Here’s the decision matrix we use with our Marietta customers, and you can use it on your own:

• Furnace is under 10 years old: repair almost always makes sense. The unit still has 5 to 10 years of life. Furnace repairs run $150 to $700, so even a blower motor replacement at $600 on a 8-year-old furnace is a good investment.
• Furnace is 10 to 15 years old: repair makes sense for small items (ignitor, flame sensor, pressure switch, capacitor) up to about $500, but if the repair is $600+ and the unit is 14 years old with rust around the burners, start planning for replacement. Get a free quote and compare it to the repair.
• Furnace is 15+ years old: any repair over $300 to $400 deserves a hard look at replacement. A $5,500 replacement over 15 years costs the same per year as one $370 repair, and the replacement comes with a full warranty, higher efficiency, and no fear of a dead furnace on a 20-degree night.
• Heat exchanger cracked or rusted through: this is a safety issue first, cost issue second. If the heat exchanger is out of warranty, the repair is often $1,200 to $1,800, and we’ll tell you honestly that replacing the furnace is the better call. A cracked heat exchanger can leak carbon monoxide into your home, and we won’t band-aid a safety problem with a part that’s past its designed life.

FAQs: Furnace Replacement Cost in Marietta

How much does a furnace replacement cost in Marietta, GA in 2026?

Most furnace replacements in Marietta cost $4,200 to $8,900 for a standard single-family home. A basic mid-efficiency furnace starts around $4,200 installed, while a high-efficiency model runs $5,900 to $12,000 depending on brand, size, and home configuration. The typical homeowner in Marietta spends around $5,500 to $6,800 for a quality mid-range furnace with full installation and warranty. For an exact quote on your home, call (478) 662-5175 for a free estimate.

How much does it cost to replace a furnace in a 2,000 square foot Marietta home?

For a 2,000 square foot home in Marietta, furnace replacement typically costs $4,800 to $7,500. That includes a 60,000 to 80,000 BTU furnace, installation labor, permits, removal of the old unit, and basic venting connections. High-efficiency models in this size range run $6,000 to $9,000. Homes with ductwork issues or older venting configurations can push the total higher, and we’ll show you those numbers in writing before any work begins.

Is it cheaper to repair or replace a furnace?

For a furnace under 10 years old, repair is almost always cheaper, with typical furnace repairs in Marietta running $150 to $700. For units over 15 years old, replacement usually wins: a $5,500 replacement over 15 years costs about $367 per year, while a $400 repair on an aging furnace may only buy you one more season. The break-even point is roughly when the repair exceeds one-third of the replacement cost. Call (478) 662-5175 and we’ll give you an honest recommendation and a free quote either way.

How long does a furnace replacement take in Marietta?

A standard furnace swap-out in Marietta takes one full day, typically 6 to 8 hours from arrival to final walkthrough. If your job includes ductwork modifications, new venting, or a gas line upgrade, plan for a day and a half to two days. We schedule your install with a confirmed arrival window, and we send you the name and photo of your lead installer before the day arrives.

Can I replace my furnace in the winter in Marietta?

Yes, and we do winter replacements regularly. Marietta’s heating season runs from November through March, and a furnace failure in January is exactly when our customers need fast service. We answer calls with a live person 24/7 at (478) 662-5175, and we can typically complete a standard furnace replacement within 24 to 48 hours of your call, weather and permitting permitting. If your furnace dies on a cold night, you’re not waiting a week for heat.

What are the signs that a furnace needs replacement instead of repair?

The most reliable signs: your furnace is over 15 years old, repair bills in the last two seasons total more than $700, the burners show rust or the flame burns yellow instead of blue, rooms heat unevenly, or you hear banging sounds when the blower kicks on. Any of these, combined with a repair estimate over $500, is usually a signal to price out replacement. We’ll inspect yours for free and show you the numbers for both options.

What Is Included in Brandt HVAC Co Marietta Furnace Replacement?

Every furnace replacement from us includes these items as standard, no add-on needed:

• New furnace unit in the size and efficiency you choose, from any major brand including Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard
• Full removal and disposal of the old furnace
• Gas line connection, leak testing, and pressure verification
• Venting installation or modification to code
• Electrical connections and thermostat setup
• Cobb County and City of Marietta permits and inspection coordination
• Full startup, combustion analysis, and airflow testing
• Written guarantee covering the installation for 365 days under our 365-Day Done Right Promise
• Manufacturer warranty registration completed on your behalf
• Technician identity notification: name and photo sent to you before arrival, photo ID badge shown at the door

We don’t leave anything out of the quote and then “discover” it later. The written price you approve is the price you pay.

The Brandt HVAC Difference: Why Certainty Matters in Furnace Replacement

The name Brandt comes from an old word for a firebrand, a fitting name for the work of keeping a home warm. We named the company for the thing our customers trust us to protect: the fire in the furnace and the warmth in the home. That responsibility means more than swapping equipment, it means showing up as the people we said we would be, with the price we said we would charge, doing the work the way we said we would do it.

Most homeowners don’t worry about the furnace. They worry about the stranger in the hallway while the furnace gets fixed. We built Threshold Verified for exactly that reason. Every technician we send is background-checked and identity-verified before they ever knock on your door. You get their name and photo by text or email before the visit. At the door, they hold up a photo ID badge and introduce themselves. If the person standing there isn’t the person we told you to expect, the visit is on us, and we make it right. That standard applies to every service call and every furnace replacement in Marietta.

Devin Marlowe and the team in Cobb County have spent years earning the trust of homeowners who want to feel safe in their own homes while strangers work there. That trust is built one written estimate, one on-time arrival, one verified technician, and one warm winter at a time.

Contact Brandt HVAC Co Marietta for a Free Furnace Replacement Estimate

If you’re considering a furnace replacement in Marietta, start with a free in-home estimate. We’ll inspect your current furnace, measure your home, and give you a written price with equipment options, all with no obligation. Call (478) 662-5175 anytime, day or night. A live person answers 24/7, every day of the year, no voicemail and no phone trees. We’ll schedule your assessment, send you the name and photo of your technician before the visit, and walk you through every option in plain language. You’ll know exactly what it costs and exactly who is coming to your door. That’s the deal we’ve offered every Marietta homeowner since we opened.

Pricing reflects the Marietta market as of 2026. Brandt HVAC Co Marietta offers free estimates – call (478) 662-5175.