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AfterFurnace Replacement in Marietta, GA
A full furnace replacement in Marietta typically runs between $4,200 and $7,800 for a mid-efficiency gas unit in a standard 2,000-square-foot home, with high-efficiency models from Trane or Lennox landing closer to $8,500 to $12,000 installed. The job usually takes one day, and we hand you a written price before any equipment is ordered or any work begins. If your furnace is over 15 years old or the heat exchanger has failed, replacement is usually the smarter money than another repair.
Cold Harbour Heating and Air Marietta has been replacing furnaces in Cobb County since 2003, and we treat the job like it’s going in our own home. That means no surprise line items, no showing up late without a call, and a written guarantee that covers the new system from the day it’s installed. If you’re weighing repair against replacement, call us at (762) 240-5599 and we’ll talk it through honestly. Our full Heating & Furnace in Marietta page covers the broader scope of what we do, but this page is about replacement specifically.
The name Cold Harbour comes from the old roadside shelters where travelers waited out rough weather. Your furnace is the modern version of that shelter, and when it’s done, you need it working again without drama. That’s the job we’ve done for Marietta homeowners for more than two decades.
Key Takeaways
- Furnace replacement in Marietta costs $4,200 – $12,000 depending on efficiency, size, and brand.
- We provide a written price before any work starts, and it does not change at the door.
- Every new furnace installation comes with a written guarantee.
- We service and install Trane, Lennox, Goodman, Rheem, and five other major brands.
- Live person answers the phone 24/7, including holidays and the coldest nights of the year.
When You Need Furnace Replacement
Not every furnace problem means replacement. But some do, and waiting too long in a Marietta winter is a gamble you don’t want to take. Here are the situations where we typically recommend a new unit rather than another patch job:
- Your furnace is 15 to 20 years old. The average gas furnace lasts 15 to 20 years in Georgia’s climate. Once you’re in that window, a major repair like a blower motor or control board failure is often the first of several. Putting $800 into a 19-year-old furnace is rarely the best use of your money.
- The heat exchanger has cracked. This is the safety-critical component that separates combustion gases from the air you breathe. A cracked heat exchanger can leak carbon monoxide into your home. When this fails, replacement is almost always the right call, and we’ll walk you through exactly why before you spend a dollar.
- Your energy bills have crept up year after year. Older furnaces in Marietta often run at 70% to 80% efficiency. A new high-efficiency unit from Goodman or Rheem can hit 95% or higher, which translates to real savings on Georgia Power bills every winter.
- You’re repairing it more than once a season. If we’ve been out twice in the same winter for different problems, that’s a pattern, not a coincidence. A new furnace stops the cycle.
- Rooms are heating unevenly despite repairs. East Cobb split-levels, ranch homes off Powder Springs Road, and older bungalows near the Square all have different duct layouts. If you’ve addressed the ducts and rooms are still cold, an undersized or aging furnace is often the culprit.
- Your furnace is making noises it never used to make. Banging, rumbling, or a persistent hum that gets louder each week usually indicates wear inside the heat exchanger or blower assembly. By the time you hear it clearly, the problem is advanced.
If any of these sound familiar, give us a call. We’ll send a background-checked, uniformed technician who will give you an honest assessment, not a sales pitch.
Our Furnace Replacement Process
Here’s exactly how a furnace replacement with Cold Harbour Heating and Air Marietta works, step by step, based on The Kingswell Way: say the price before the work, show up in the window given, leave the place cleaner than we found it, put the guarantee in writing, and come back if it fails.
- You call, a live person answers. Day or night, weekends included, a real person picks up the phone at (762) 240-5599. You tell us what’s going on, and we schedule a visit in a firm arrival window. Not a four-hour range, not “sometime Tuesday.” A window we commit to.
- We inspect your current furnace and your home’s ductwork. The technician checks the furnace itself, the duct connections, the thermostat wiring, and the square footage we’re actually heating. A 2,200-square-foot home off Barrett Parkway needs a different unit than a 1,600-square-foot ranch near the Marietta Country Club.
- We hand you a written price. Before we order equipment or touch a single tool, you get the total cost on paper. That number includes the furnace, labor, disposal of the old unit, and any necessary sheet metal work. It does not change when the job is done.
- We install the new furnace in one day. Our technicians show up on time, lay down floor protection, and get to work. Most replacements are done in four to six hours. We pull a permit when local code requires it, and we handle the inspection scheduling.
- We walk you through the new system and test everything. Before we leave, we fire the new furnace, check gas pressure, confirm the thermostat is communicating correctly, and make sure every room is getting warm air. You’ll know how to change the filter and adjust the settings before we go.
- We leave the job site clean and hand you a written guarantee. No old equipment left in the yard, no screws in the carpet, no dust cloud. You get the guarantee in writing before the technician leaves, covering the installation and the equipment.
This process is the same whether we’re installing a Lennox two-stage unit in a colonial off Roswell Road or a Rheem single-stage model in a townhome near the Battery.
Furnace Replacement Pricing in Marietta
Here are honest numbers for what furnace replacement costs in Marietta, based on the jobs we’ve done across Cobb County. Your exact price depends on the size of your home, the efficiency rating you choose, and whether any ductwork modifications are needed.
Every quote includes the furnace, labor, haul-away of the old unit, and all sheet metal connections. No hidden disposal fees. No surprise fuel surcharges.
- Mid-efficiency gas furnace (80% AFUE), 1,500 – 2,000 sq ft home: $4,200 – $5,800
- High-efficiency gas furnace (95 – 96% AFUE), 1,500 – 2,000 sq ft home: $5,800 – $7,800
- High-efficiency gas furnace (96%+ AFUE) with variable-speed blower, 2,500+ sq ft home: $7,800 – $12,000
- Brand premium for Trane or Lennox high-efficiency models: Add $800 – $1,800 over entry-level Goodman or Rheem equivalents
- Chimney liner replacement (required when switching from 80% to high-efficiency venting): $400 – $900
- Thermostat upgrade to a smart or Wi-Fi-capable model: $150 – $400
Several factors move the price up or down. A cramped crawlspace or attic access off Powder Springs Road adds labor time. A furnace closet in a condominium near the Square is tighter to work in than a full basement. If your ductwork needs sealing or replacement sections, that’s additional, and we’ll tell you before we start, never after.
Estimates are free. Call (762) 240-5599 and we’ll schedule a time to come out, measure, and give you a written number. You keep the quote whether you hire us or not.
FAQs – Furnace Replacement
How much does furnace replacement cost in Marietta?
Furnace replacement in Marietta typically costs between $4,200 and $12,000, with most standard homes landing in the $5,000 to $8,000 range. High-efficiency models from Trane or Lennox cost more than mid-efficiency Goodman or Rheem units, and larger homes with bigger duct systems fall on the higher end. Call (762) 240-5599 for a free written estimate tailored to your home.
Is it cheaper to repair or replace my furnace?
If your furnace is under 12 years old and the repair is under $600, repair usually wins. Once the unit passes 15 years, or if the heat exchanger has cracked, replacement is nearly always the better financial choice over a three-to-five-year horizon. We’ll give you the straight answer for your specific situation, even if it means we make less money on the job.
How long does furnace replacement take?
Most furnace replacements take one day, usually four to six hours from arrival to final walkthrough. If we need to add a chimney liner or make ductwork adjustments, it can run into a second morning. We’ll tell you the timeline when we hand you the written price, and we stick to it.
Do you install furnaces in older Marietta homes?
Yes. We’ve replaced furnaces in 1920s bungalows near the Marietta Square, 1970s split-levels off Canton Road, and brand-new builds near Kennesaw Mountain. Older homes sometimes need venting upgrades or electrical work if the original furnace is decades out of code, and we’ll walk you through that before any work begins. Call (762) 240-5599 and we’ll assess your specific situation.
If you’re ready to stop worrying about whether the heat will come on, call us today at (762) 240-5599 for a free estimate on furnace replacement in Marietta. A live person answers, day or night, and we’ll set a firm window for your visit. The price you get on paper is the price you pay, and the guarantee is written down before we leave. That’s how we’ve done it since 2003, and that’s how we’ll do it for your home.
Written by Victor Mancini, Owner at Cold Harbour Heating and Air Marietta, serving Marietta.