Lennox HVAC Service Nationwide

Why Marietta Homeowners Choose Lennox HVAC

We provide independent Lennox in Marietta HVAC repair, service, and installation across Marietta, GA, and we work on these systems every single week, from the Merit Series to the full communicating Signature Collection. What sets our Lennox work apart is that we know how these units fail specifically in Cobb County: acidic soil air eating evaporator coils, humid summers stressing condensate drainage, and the occasional hard freeze exposing weak ignitors and heat exchangers. We are not a Lennox factory dealer and we don’t pretend to be one. We are a local Marietta company that knows Lennox equipment inside and out, stocks the parts that matter, and backs every repair with the 365-Day Done Right Promise in writing. Call (762) 240-5599 when your Lennox stops doing its job.

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Why Trust Cold Harbour Heating and Air Marietta for Your Lennox HVAC?

Our technicians in Marietta tear down Lennox equipment constantly, from single-stage Merit Series condensing units to variable-capacity XC25 heat pumps that talk to the thermostat through a communicating bus. We know which Lennox parts fail and when. We know that an ML180 furnace ignitor rarely makes it past seven years in a Marietta attic because the heat cycling and dust load shorten its life. We know that XC16 evaporator coils develop pinhole leaks faster in this part of Georgia because the soil air that settles into crawlspaces and ground-floor closets carries more acidity than upstate air.

Victor Mancini, the owner here, learned the trade at Los Angeles Trade-Technical College before spending close to two decades doing HVAC work across the Southeast. He and our crew have served Marietta for years, from quick tune-ups in East Cobb to full system replacements near Kennesaw Mountain. Most of our calls come from neighbors referring neighbors, and that only happens when you give a straight answer on cost before anyone touches a wrench and stand behind the work when it matters. That’s who we are on every Lennox job.

Common Lennox HVAC Problems We Fix in Marietta

Here are the failure patterns we actually see on Lennox equipment in Marietta, not the generic list you find on a national page. Each one is specific to how these systems age in Cobb County’s climate and housing stock.

• Ignitor failure on ML180 and EL180 furnaces. Lennox Merit and Elite 80% furnaces use a hot-surface ignitor that simply wears out after 5 to 7 years. In Marietta, where furnaces sit idle through long springs and then fire hard during winter cold snaps, the ignitor often cracks on the first cold morning of the season. The furnace draft inducer runs, but the burners never light. This is a $150 to $280 repair, parts and labor included.
• Evaporator coil leaks on XC16 and EL16 air conditioners. Lennox Elite Series coils are tightly finned and efficient, but they are also thinner in the tubing wall than older copper coils. In Marietta, the acidic soil air that works its way into crawlspaces and first-floor mechanical closets accelerates pinhole corrosion. A coil that would last 15 years in a dry climate may leak at year 10 here. We pressure-test with nitrogen before we quote a coil replacement, because we’ve seen too many contractors replace a coil on a guess.
• ECM blower motor control board faults on L-series air handlers. Lennox air handlers such as the CBX25UH and the variable-speed CBA27UHE use electronically commutated motors with control boards that fail under voltage spikes and just plain heat stress. A Marietta attic in July can sit at 130 degrees, and boards do not love that. The symptom is usually a blower that runs at full speed and never ramps down, or a motor that refuses to start on a call for cooling.
• Refrigerant undercharge from micro-leaks at heat pump reversing valves. On Lennox heat pumps, including the Dave Lennox Signature Collection models, the reversing valve body has multiple braze joints where micro-leaks develop over years of thermal expansion and contraction. The system still runs, but cooling capacity drops and the compressor runs hotter. We find these with an electronic leak detector and fix them with a proper evacuation and recharge, not by simply topping off over and over.
• Condensate drain clogs from Marietta’s humidity. This is not a Lennox defect, but the way Lennox evaporator coils are positioned in horizontal attic applications makes the primary drain pan shallower on some models. In a Marietta summer with afternoon thunderstorms and dew points in the 70s, algae and bio-slime build faster, and the pan overflows. We clear and treat the drain line and check the float switch on every cooling tune-up.

Lennox Parts & Our Repair-vs-Replace Approach

We install OEM Lennox parts whenever lead time allows, because a genuine Lennox control board or inducer motor is engineered to the exact voltage and communication protocol of your system. That matters especially on communicating systems like the XC25 and the iComfort thermostat, where aftermarket boards can cause compatibility headaches. But when a Lennox part is discontinued, or the lead time would leave your family without air in a Marietta July, we use proven factory-equivalent aftermarket parts from manufacturers we’ve tested on the same equipment in the field. We’re honest about which is which, and the price on paper reflects the part actually going in.

For a Lennox unit over 12 years old with a major failure, like a dead compressor in an ML14 condensing unit or a cracked heat exchanger in an older G-series furnace, we show you the repair cost against the installed cost of a new system before you spend a dollar. Most of the time, a $900 inverter board replacement makes sense on a 7-year-old XC25. On a 14-year-old EL16 with a leaking coil and a tired compressor, the math points the other way. We’ll show you both sides and let you decide without pressure. Call (762) 240-5599 and we’ll give you a straight number.

Our Lennox Service Process – Step by Step

1. 1
   Diagnosis. We test the Lennox-specific failure chain, not just the symptom. For a no-heat ML180, we verify the ignitor resistance, check the pressure switch for steady draft, and inspect the flame sensor. For a low-cooling XC16, we measure superheat and subcooling and pressure-test the coil before we talk about a repair.
2. 2
   Written quote before work starts. The price you get is the price on the invoice. This comes from The Kingswell Way, which we follow on every job: say the price before the work, and do not change it at the door. If you decide the repair isn’t worth it, you owe us nothing for the diagnosis on a standard service call.
3. 3
   Repair or installation. We install the part, replace the system, or perform the service with the correct torque, vacuum, and charge procedures for the Lennox model in front of us. Communicating systems get tested on the thermostat’s installer menu, not just at the breaker.
4. 4
   Test and verify. We cycle the system through every mode, confirm temperature splits and refrigerant pressures, and check static pressure on air handlers. Your job is not done until the numbers are right.
5. 5
   Written warranty. Every repair leaves with the 365-Day Done Right Promise in writing. If the repair fails within 365 days, we return and correct the work at no additional charge. That guarantee is on paper before our technician leaves your Marietta driveway.

Lennox Products We Service & Install in Marietta

We service and install the full range of Lennox residential equipment you are likely to own in Marietta. That includes the Merit Series: ML14 air conditioners, ML180 furnaces, and ML14 heat pumps, which are the builder-grade workhorses common in early-2000s subdivisions. We also work heavily on the Elite Series: XC16 and EL16 condensing units, EL180 and EL296 furnaces, and EL18 heat pumps. At the high end, we service the Signature Collection, including XC25 variable-capacity air conditioners, SL280 two-stage furnaces, and Dave Lennox Signature Collection heat pumps with communicating controls. If your Marietta home has an older Lennox system, a G26, G40, or HS26, we can still get most parts or find a factory-equivalent that fits.

We Also Service These Brands

While we also offer AC Repair for other brands, Lennox is one brand we know deeply, but it is not the only one. Our technicians are trained on nine major residential HVAC brands, and we service Carrier and Trane systems in Marietta every week as well. If your home has a mixed system, a Lennox furnace paired with a Carrier coil, for example, one call covers all of it.

FAQs – Lennox HVAC Service in Marietta

Book Your Lennox Service in Marietta, GA

If your Lennox system is acting up, do not wait for a small problem to become a hot night or a cold morning. Call (762) 240-5599 for a free estimate. A live person answers, 24 hours a day, every day, and we will have a uniformed, background-checked technician at your Marietta home in the window we give you. Tell us what the system is doing, and we will tell you exactly what it needs, no guesswork, no runaround.

Written by Victor Mancini, Owner at Cold Harbour Heating and Air Marietta, serving Marietta since 2003.