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AfterHow Much Does Furnace Replacement Cost in Marietta?
A full furnace replacement in Marietta, GA typically runs between $4,200 and $8,900 in 2026, including equipment and installation. Most single-family homes in the Marietta area land between $5,000 and $6,800 for a standard-efficiency gas furnace swap with no major ductwork changes. The final number depends on furnace size, efficiency rating, brand, and whether your existing venting or electrical needs updating during the install. Call us at (229) 514-0545 for a free, written estimate specific to your home.
Andre Fuller has been pricing furnace replacements in Cobb County since 2004, and the ranges above reflect what we actually see on job sites from Kennesaw to Smyrna every week. If you’re looking at a number far outside that range, there’s usually a specific reason: a 90+ AFUE upgrade, a move from electric to gas, or a furnace relocation from a closet to an attic. We’ll break down every line item so you can see where the money goes before you sign anything.
Furnace Replacement Cost Breakdown (2026)
Here’s exactly where your money goes on a furnace replacement in Marietta. We’re showing real 2026 numbers we’ve pulled from our own completed jobs in the area, not national averages that don’t reflect Cobb County labor costs or the mix of 1960s ranches and 2000s suburban builds we work on here.
| Cost Component | Budget Range | Mid-Range | Premium |
|---|---|---|---|
| Furnace unit itself (gas, 80% AFUE) | $1,100 – $1,800 | $1,900 – $2,600 | $2,700 – $3,500 |
| Furnace unit (gas, 90 – 96%+ AFUE) | $2,000 – $2,800 | $2,900 – $3,800 | $3,900 – $5,500 |
| Labor and installation | $1,500 – $2,200 | $2,200 – $3,000 | $3,000 – $4,500 |
| Permit and inspection (City of Marietta) | $75 – $150 | $150 – $250 | $150 – $250 |
| Basic sheet metal / duct transition | $200 – $500 | $400 – $700 | $700 – $1,200 |
| New thermostat | $50 – $150 | $150 – $300 | $300 – $600 |
| Old furnace removal and disposal | $100 – $250 | $100 – $250 | $100 – $250 |
| Gas line modifications (if needed) | $200 – $450 | $450 – $900 | $900 – $1,800 |
| Flue/vent pipe replacement | $250 – $500 | $500 – $900 | $900 – $1,500 |
| Total typical job | $3,500 – $5,800 | $5,800 – $8,200 | $8,200 – $12,000+ |
Those ranges hold for the vast majority of Marietta homes we work in, from a 900-square-foot ranch in the Fair Oaks area to a 3,500-square-foot two-story off Whitlock Avenue. The biggest swing factor is efficiency tier. An 80% AFUE furnace (the legally required minimum for home heating installations in Georgia) costs less up front. A 96% AFUE condensing furnace cuts your gas bill by 15 – 20% but adds $1,500 – $3,000 to the installed price. We’ll run the numbers both ways and show you which one pays off sooner based on your actual usage.
What Affects Furnace Replacement Pricing in Marietta
Every house in Marietta has a slightly different set of constraints. These are the factors we see moving the price needle most on replacement jobs in this market.
- Furnace efficiency rating (AFUE). The difference between an 80% and a 96% AFUE unit is typically $1,500 – $3,000 on the installed price. Higher efficiency means a secondary heat exchanger and a condensate drain, both of which add parts and labor. For a Marietta home that runs heat from November through March, the high-efficiency route often pays for itself in 4 – 7 years.
- Furnace size (BTU rating). A 40,000 BTU furnace for a small condo near Marietta Square runs cheaper than an 100,000 BTU unit for a large colonial in Indian Hills. Sizing isn’t something you guess at; we run a Manual J load calculation on every replacement so you’re not paying to heat square footage you don’t have, and not undersized when the temperature drops into the 20s.
- Brand selection. We install Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. Goodman and Rheem tend to land 10 – 20% below Carrier and Trane for an equivalent spec. The premium brands cost more for the name and sometimes slightly better cabinet insulation or quieter operation. Every one of them gets the same written price guarantee and 365-Day Done Right Promise from us.
- Existing venting condition. Homes built before 1990 in Marietta often have metal flue pipes that don’t meet current code for new high-efficiency furnaces. If your old furnace used a chimney and you’re moving to a 90%+ unit, you’ll likely need PVC venting run through a side wall or roof penetration. That’s a $250 – $1,500 line item depending on access.
- Access and location. Crawlspaces, tight attic hatches, and basement staircases that barely fit a grown adult slow down a replacement. We see this weekly in older neighborhoods like Manget and Whitlock Heights, where 1950s construction means tight mechanical rooms. A furnace in an open, unfinished basement is fastest and cheapest to swap. In a cramped attic with a scuttle access, plan for 1 – 3 extra labor hours.
- Gas line condition. If your existing gas line is corroded, undersized, or doesn’t meet current Cobb County code, it has to be replaced before the new furnace fires up. On older Marietta homes with original black iron pipe, we budget $450 – $1,800 for gas work as a contingency. It’s one of the few line items that genuinely can’t be quoted sight-unseen, because the pipe condition is only visible once we open up the wall or crawlspace.
How to Save on Furnace Replacement in Marietta
You don’t have to take the first number any contractor hands you, and you shouldn’t. Here’s what actually moves the needle on price in 2026.
- Get a precise sizing calculation, not a guess. We do a free Manual J load calculation with every replacement estimate. An oversized furnace costs more up front and cycles short, which shortens its life and wastes gas. A correctly sized unit is the single best way to avoid paying for capacity you’ll never need. Ask any contractor bidding your job if they run a load calculation or if they’re just matching your old furnace’s size. The ones who skip it are the ones who’ll oversell you.
- Compare installed prices, not equipment-only prices. A furnace that costs $1,800 online still needs $2,000 – $3,000 in labor, permits, disposal, and materials to install legally and safely in Marietta. We give you the full installed price in writing before work begins, with every line item separated. There’s no “equipment-only” bargain hiding in that number; it’s the real cost to have heat working in your house by tonight.
- Time your replacement for the off-season. October through February is the busiest stretch for furnace replacements in Cobb County, and some companies pad their quotes during peak demand. If you can replace your furnace in April, May, or September, you’re more likely to get a faster schedule and occasionally a manufacturer rebate that’s only available in shoulder months. We keep our pricing flat year-round, but scheduling flexibility can still save you a hundred or two on incidental costs like after-hours permit filing.
- Check manufacturer rebates before you buy. Carrier, Trane, Goodman, and Rheem run seasonal rebates that change every 60 – 90 days. We track them and apply every eligible rebate to your quote automatically. A $400 – $800 rebate on a mid-range furnace is common in 2026, especially during spring promotions. If a contractor doesn’t mention rebates, they might be keeping them.
- Ask about the permit. The City of Marietta requires a mechanical permit for furnace replacement, and the fee is baked into most quotes. If a company offers to replace your furnace without pulling a permit, you haven’t saved money; you’ve created a liability and probably a code violation. We pull permits on every replacement, and the $75 – $150 cost is shown as its own line item so you know exactly what the city is charging.
We give free estimates with no obligation. Call (229) 514-0545 or book online and we’ll send you a written price before any work begins. You’ll see the total number, all the line items, and what’s included. That’s the same number you’d pay on install day.
Is Furnace Replacement Worth It vs. Repair in Marietta?
Most furnace repairs run between $150 and $700, which makes repair the obvious first choice when the problem is isolated: a bad ignitor, a failed blower motor, a cracked pressure switch. But when your furnace hits the 15-year mark and needs a $700 repair, the math gets harder. You’re spending 10 – 15% of a replacement cost on a machine that’s statistically likely to fail again within 12 months. Our rule of thumb: if the repair cost multiplied by the furnace age in years tops $5,000, replacement is usually the smarter money. A 15-year-old furnace with a $450 repair hits $6,750. A 6-year-old unit with a $300 repair? Fix it. We’ll give you that math in writing on any Furnace Replacement in Marietta quote, so you can see whether repair or replace makes more sense for your specific unit.
How Long Does Furnace Replacement Take in Marietta?
A standard like-for-like gas furnace swap in Marietta takes 4 – 8 hours, which means we finish most jobs in a single day. The work involves removing the old unit, setting the new one, connecting gas and electrical, fitting the duct transition, and testing combustion and airflow. If we’re also replacing the evaporator coil or adding a new vent run, the job can stretch to a second day. When you book with us, you’ll get a live arrival time and you can track your technician to the door. No four-hour windows, no “sometime between 8 and 5.” If the job runs long, you’ll know why and what’s happening in real time.
What we cannot do is give you a one-size-fits-all duration without knowing your ductwork and access. A furnace in an open basement goes fast. An attic replacement in a 1960s rancher with a 22-inch scuttle gets a longer labor line, because moving a 120-pound furnace through a 22-inch opening takes care and time. That’s a safety concern too: high-tension cabinet panels and gas connections aren’t something to rush. We take the time needed to get the install done right and code-compliant.
Common Furnace Replacement Scenarios in Marietta
Here’s what we quote most often in this market, with real numbers so you can anchor your own expectations.
Scenario 1: 1,400-square-foot ranch, gas furnace, basement access
Typical home in the Franklin Road corridor or off South Cobb Drive. Built 1970 – 1990, basement access is open, existing furnace is a 80% AFUE unit from 2008. Replacement with a mid-range 80% AFUE unit runs $3,800 – $4,800. Upgrade to 96% AFUE adds about $1,800 – $2,400. This is the most common replacement we do in Marietta.
Scenario 2: 2,400-square-foot two-story, 90% AFUE upgrade from a 1980s unit
Mostly in East Cobb subdivisions and around the Indian Hills country club area. The old unit vents through a chimney that can’t be reused for the new high-efficiency furnace. New PVC venting, updated gas piping, and a variable-speed blower motor put the job at $6,200 – $8,400. If the home still has a 1980s air conditioner paired with the furnace, we’ll often recommend doing the AC at the same time; the combined Furnace Replacement in Marietta and AC install typically lands between $9,000 – $14,000 and saves on duplicated labor and permit fees.
Scenario 3: Condo or small townhome, electric-to-gas conversion
If you’re converting an electric furnace to natural gas in a Marietta condo, and the building has gas service available, the furnace swap runs $4,500 – $6,500, but the gas line tie-in and any property management coordination can add $800 – $1,600. We handle the HOA paperwork and the scheduling; that coordination time is built into our quote so there’s no surprise call from the property manager mid-job.
Furnace Replacement Warning Signs
We see a lot of furnaces on their last season before they fail completely. Here’s what we look for when homeowners in Marietta call us for an evaluation. These tell you whether you’re months away from a replacement or years away.
- Age over 15 years. Most gas furnaces last 15 – 20 years in this climate. If yours is older than 15 and needs a $400+ repair, it’s worth considering replacement rather than putting more money into an aging machine.
- Rising gas bills with no change in usage. A slow efficiency loss shows up in your Marietta Gas bill before it shows up in the unit’s behavior. Compare your January bill year over year. A 15 – 25% increase without a rate change or colder winter means the furnace is losing combustion efficiency.
- Yellow flame instead of blue. A healthy gas furnace burns with a blue flame. A yellow or flickering flame signals incomplete combustion, which can mean carbon monoxide production. If you see a yellow flame, shut the unit off and call a technician. That’s not a DIY inspection item; it’s a safety matter for a trained professional with a combustion analyzer.
- Constant cycling on and off. Short cycling (running for under five minutes at a time) doesn’t just waste gas; it indicates an oversized unit, a failing thermostat, or a clogged filter. Left unaddressed, short cycling kills blower motors and heat exchangers in a season or two.
- Visible rust, cracks, or water around the furnace base. Rust on a furnace cabinet in a humid Georgia basement is normal for a 20-year-old unit, but rust that’s advanced to a point where the heat exchanger is compromised is a carbon monoxide risk. Condensing furnaces also produce water, and a leaking condensate line can drip water onto the floor near the unit. Any water around a gas furnace is worth a technician’s look.
- Unusual banging, popping, or rattling during operation. Banging on startup often means ductwork expanding and contracting, which is generally harmless. Rattling can mean a loose blower wheel or a failing motor mount. These are repairable when caught early, but ignoring them leads to a blower failure that costs $350 – $650 to fix on top of whatever other issues the furnace has developed.
Does Your Furnace Replacement Qualify for a Rebate or Tax Credit in Marietta?
In 2026, the federal Energy Efficient Home Improvement Credit is still in place, offering a credit of up to $600 for qualifying high-efficiency furnaces meeting the required AFUE thresholds. Georgia also has utility-level rebates. Georgia Power and Marietta Gas offer occasional rebates for high-efficiency upgrades, often $150 – $400 on a 95%+ AFUE unit. These programs change, so we check current eligibility on every quote and apply every rebate you qualify for. The rebate doesn’t drop the quote number; it comes off your net cost after purchase, and we show you the expected rebate amount in writing.
FAQs – Furnace Replacement Cost
These are the questions we hear most often from Marietta homeowners when they’re pricing a furnace replacement. Each answer leads with the number range you asked for, then the context that makes the number useful.
What is the cheapest furnace replacement we can do in Marietta?
The cheapest legal, code-compliant furnace replacement we install in Marietta is about $3,500 – $4,200 for an 80% AFUE unit in an accessible basement with no ductwork or gas line issues. That includes labor, permit, disposal, and a new basic thermostat. If your home needs venting work, gas line repair, or a new return-air drop, the price moves up accordingly. Call (229) 514-0545 and we’ll tell you honestly if your house qualifies for that bottom-end number or what your specific constraints add.
How much does a high-efficiency furnace cost in Marietta?
A 96% AFUE high-efficiency furnace replacement in Marietta runs $5,800 – $12,000, depending on the brand, the unit size, and whether we’re also replacing the thermostat and venting. The condensing furnace itself costs $2,900 – $5,500, and installation with new PVC venting typically adds $2,900 – $6,500. That higher up-front cost usually reduces your gas bill by $150 – $300 per year in a typical Marietta winter, so the payback window is 4 – 7 years for most homes.
Is it cheaper to replace a furnace in the summer in Marietta?
The furnace price itself doesn’t change with the season, but you can sometimes save $100 – $300 in the summer because manufacturers run rebates in spring and early summer that expire before fall heating season. You’ll also get a faster install appointment: in July, we can typically replace a furnace within 2 – 3 days, while a January emergency replacement might wait 5 – 7 days during peak demand. If your furnace is 15+ years old and still working, replacing it in June or July is the smartest scheduling decision you can make in this market.
What does a furnace replacement permit cost in the City of Marietta?
Marietta’s mechanical permit for furnace replacement costs $75 – $150 as of 2026, depending on the scope of work and whether added gas line modification triggers a plumbing permit review. We file the permit, schedule the inspection, and meet the inspector on site. The permit fee is a line item on your quote, not a hidden markup. If a contractor offers to replace your furnace without one, walk away: an unpermitted furnace can flag when you sell your home and leave you liable for code violations.
Can you replace my furnace same-day in Marietta?
If we have your furnace size and spec in stock and your installation is a like-for-like swap in an accessible location, yes, we can often replace it same-day or next-day. Our trucks carry the most common furnace sizes for this market: 60,000, 80,000, and 100,000 BTU units in 80% and 96% AFUE. For large or unusual homes that need a 120,000 BTU unit or a specialty brand, plan on 2 – 4 days for equipment to arrive. Call (229) 514-0545 and we’ll check stock right then, on the phone, with a live person. No voicemail. No call-back queue. That’s how we run it around the clock.
Contact Halden Heating and Air Marietta for a Free Furnace Replacement Estimate
You can keep researching furnace prices on Google for another two hours, or you can call (229) 514-0545 right now and have a real number for your specific house. Here’s how it works: book online or call us, we send a background-checked technician with a live arrival time you can track to your door, we run a complete load calculation and inspection on your existing system, and we hand you a written quote with every line item separated. That number is locked. It doesn’t change at the door. If it’s not done right, we come back free under our 365-Day Done Right Promise.
The Relay Visibility Guarantee is our standard on every job: you see who’s coming, when they’ll arrive, and what it costs before the work happens. Andre Fuller built this company in 2004 on that exact idea, and it’s still how we run every call in Marietta today.
Call (229) 514-0545 for a free estimate, or book online and we’ll reach out with a confirmed arrival time. A real person answers. Every time.
Pricing reflects the Marietta market as of 2026. Halden Heating and Air Marietta offers free estimates – call (229) 514-0545.
Written by Andre Fuller, Owner at Halden Heating and Air Marietta, serving Marietta since 2004.
What Our Customers Say
"Fast response and clear updates. Booked in the morning and the tech was here before lunch."
- Noah M."Furnace ignitor replaced. Paid online, no paperwork."
- Ivy R."They texted me a photo of the dirty coil and what was done. Easy to understand."
- Carlos D.