Lennox Furnace Repair Nationwide

Lennox Furnace Repair in Marietta: What to Know First

Lennox furnace repair in Marietta typically runs $150 – $700, and most jobs are completed the same day we arrive. We’re an independent Lennox service provider, not a factory-authorized dealer, which means we replace only what’s actually failed and hand you a written price before any work begins. If you own a Lennox in Marietta and the heat won’t kick on, call (762) 240-5599 and tell us what the system is doing, and we’ll tell you exactly what it needs. No guesswork, no runaround.

Call (762) 240-5599

This page is for Marietta homeowners with a Lennox furnace that’s blowing cold air, short-cycling, making noise, or not starting at all. We’ll cover what fails on Lennox systems, what repairs realistically cost, and how our 365-Day Done Right Promise works on paper, not as a handshake.

Key Takeaways

• Cost: Most Lennox furnace repairs in Marietta fall between $150 and $700, parts and labor included.
• Speed: We run same-day service across Marietta, including East Cobb, West Cobb, and near Kennesaw Mountain.
• Guarantee: Every repair carries a written 365-day guarantee. If it fails inside a year, we return and fix it at no charge.
• Warranty-safe: We preserve your Lennox manufacturer warranty by following OEM repair protocols and documenting everything.

How Lennox Products Fail – and How We Fix Them

Lennox builds solid furnaces, but every line has its own failure patterns. We see the same handful of issues across Marietta neighborhoods, from East Cobb to Powder Springs. Here’s what actually goes wrong.

• Ignitor failure on the Elite and Merit series: Lennox uses silicon nitride ignitors on most Elite and Merit furnaces, and they crack after years of thermal cycling. The symptom is a furnace that hums and tries to light, then locks out. We replace with a genuine Lennox ignitor rather than a cheap aftermarket part, because the aftermarket pieces burn out in two winters. A typical ignitor replacement runs $180 – $280.
• Pressure switch trips on high-efficiency condensing models: The SLP98 and EL296 condensing furnaces use a pressure switch to verify the inducer fan is pulling correctly. When the condensate line clogs, the pressure switch trips and the furnace won’t fire. In Marietta’s humid climate, condensate lines grow algae fast. We clear the line, check the trap, and verify the switch. This repair typically falls between $150 and $300.
• Burner flame sensor fouling on the ML180 and EL180: The single-stage ML180 and EL180 are common in older Marietta homes, and their flame sensors collect carbon until the flame cuts out after three seconds. That’s the classic “lights then goes out” complaint. Cleaning the sensor restores steady flame. We charge $120 – $200 for a cleaning and system check.
• Blower motor capacitor failure on G60 and G61 legacy models: The G60 and G61 were workhorses in their day, and many are still running in Marietta. A failing blower capacitor causes the blower to hum without turning, which starves the burners of air and trips the limit switch. A new capacitor and testing usually runs $150 – $250.
• Heat exchanger stress cracks on 15-plus-year-old units: Any furnace of that age can crack a heat exchanger, but Lennox’s early 2000s tubular designs are prone to stress fractures at the welds when airflow has been restricted by dirty filters. If we find a crack, we shut the gas off and explain your options honestly – a repair is not always worth the money, and we’ll say that plainly.

Our Lennox Furnace Repair Process

Victor Mancini grew up in Los Angeles and learned the trade at Los Angeles Trade-Technical College before spending close to two decades working HVAC across the Southeast. He’s trained our entire crew to follow the same process on every Lennox job in Marietta. Here’s what happens when you call.

1. 1
   You call (762) 240-5599. A live person answers, 24 hours a day, 7 days a week. No automated phone tree. We ask what the furnace is doing and what model you have.
2. 2
   We show up in the window we gave you. Uniformed, background-checked, and carrying test gear and common Lennox parts on the truck.
3. 3
   We diagnose before we touch anything for money. The technician reads the furnace’s error codes, checks the ignitor, flame sensor, pressure switch, gas valve, and blower. Then we hand you a written price. That price does not change at the door.
4. 4
   We decide on parts together. If it’s a warranty-active Lennox, we use OEM parts to keep the warranty intact. If the unit is out of warranty, we’ll lay out the OEM-versus-quality-aftermarket cost difference and let you choose.
5. 5
   We repair and test. The furnace runs through a full heating cycle before we pack up. We check the temperature rise, gas pressure, and safety limits.
6. 6
   We write the guarantee down. Before we leave, you get a written 365-Day Done Right Promise. If that repair fails inside a year, we come back and fix it free.

What Lennox Furnace Repair Costs in Marietta

Most Lennox furnace repairs in Marietta land between $150 and $700, and the exact number depends on which part failed and whether your unit is under warranty. Here’s what we typically see:

What moves the price? The model line (an SLP98’s variable-speed blower costs more to service than an ML180’s single-stage blower), part availability, and whether your Lennox still has manufacturer warranty coverage for the failed component. We give you the written price before any work starts, and estimates are free. Call (762) 240-5599 for an exact quote on your Lennox.

Why Marietta Homeowners Call Cold Harbour Heating and Air Marietta for Lennox Work

Most of our Marietta calls come from neighbors referring neighbors. That’s how we’ve built a reputation since 2003, operating as an independently owned member of the Kingswell network. When a homeowner has been burned before by a no-show or a price that jumped at the door, they want a company that writes everything down. We follow The Kingswell Way: say the price before the work, show up in the window given, leave the place cleaner than found, put the guarantee in writing, and come back if it fails.

Our technicians are trained on nine major residential brands including Carrier, Trane, and Lennox, so the person at your door knows the system in your home. And because we’re not tied to any one manufacturer, we give you straight advice on whether a repair is worth the cost or a replacement makes more sense. The name Cold Harbour comes from a roadside shelter where travelers waited out the weather. We like that old meaning, comfort in any season is the job.

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