Lennox HVAC in Marietta, GA

Lennox HVAC in Marietta, GA | Cold Harbour Heating and Air Marietta

We provide independent Lennox HVAC service across Marietta, GA, from quick capacitor swaps to full system replacements, including our AC Repair in Marietta. If your Lennox unit is acting up, call (762) 240-5599 and a real person answers, day or night. The thing that makes our Lennox work different here is that we actually know how Marietta’s ranch-era ductwork and muggy climate stress these systems. Victor Mancini leads our crew, and we’ve been fixing Lennox equipment in this city long enough to know its failure patterns by heart. We’re not factory-affiliated, but we carry genuine Lennox parts and the diagnostic gear to service every residential line.

Call (762) 240-5599

Whether you’re in East Cobb with a Signature Series unit or near Marietta Square with a 20-year-old G26 furnace, we show up with a written price before any work begins. That’s our Lennox sales & service standard, plain and simple.

Why Marietta Residents Choose Us for Lennox Service

Most HVAC companies will say they work on Lennox. We actually carry the OEM-spec diagnostic procedures, manifold gauges, and recovery equipment for Lennox residential lines, and our technicians see the same failure patterns on G26, G40, XC/XP, and Merit systems week after week. There’s no factory affiliation here, but there’s also no guessing.

Victor grew up in Los Angeles and learned the trade at Los Angeles Trade-Technical College before spending the better part of two decades doing HVAC work across the Southeast. He and the crew have served Marietta for years, from quick tune-ups in East Cobb to full system replacements near Kennesaw Mountain. Victor takes quiet pride in the fact that most of our calls come from neighbors referring neighbors. He’s known for giving homeowners a straight answer on what a repair actually costs before anyone touches a wrench, and for standing behind every job with a guarantee that doesn’t require a magnifying glass to read.

Every Lennox repair we perform carries the 365-Day Done Right Promise. If the repair fails within a full year, we return and correct the work at no charge. That guarantee is written down before the technician leaves your driveway.

We’re part of the Marietta service area company you want when a Lennox unit quits on a July afternoon. Trained on nine major residential brands including Lennox, Carrier, Trane, and American Standard, our technicians come background-checked and uniformed. You’ll know exactly who’s walking through your door.

Common Lennox HVAC Problems We Solve in Marietta

• Failed run capacitors on XC/XP outdoor units during summer thunderstorms. Marietta’s humid, lightning-heavy afternoons are brutal on capacitors. When the power flickers or a surge hits, the capacitor takes the hit. Your unit hums but won’t start. We replace these with genuine Lennox OEM capacitors because aftermarket ones on XC/XP systems often trigger fault codes.
• Corroded flame sensors on G26/G40 furnaces. Marietta’s crawlspace homes trap moisture, and that moisture settles on the flame sensor, causing intermittent ignition lockouts. The furnace fires, then shuts down seconds later. A cleaning might buy time, but a corroded sensor on a legacy Lennox furnace usually needs replacement.
• Variable-speed ECM motor failures on Signature and Elite air handlers. That 1950s-70s ranch in Marietta with the original undersized ductwork? Your variable-speed motor is working against it. Restricted airflow kills ECM motors early. We see this constantly on EL296V and SLP98V systems in older homes with added rooms.
• Refrigerant leaks at evaporator coil tube sheets on early-2000s Lennox splits. Attic installations in Marietta sweat through the muggy nights. That condensation on early-2000s coils leads to formicary corrosion at the tube sheets. The system slowly loses charge until it can’t cool.
• Stuck reversing valves on XP heat pumps during cold snaps. When a Marietta winter dips below freezing and the heat pump hasn’t run in heating mode for months, the reversing valve sometimes sticks. The system runs but blows cold air. It’s a specific Lennox XP failure we fix regularly when the temperature drops.

Lennox Service in Marietta: What Local Conditions Mean for Your Equipment

Here’s the thing about Lennox systems in Marietta that a generic service page won’t tell you. A huge portion of this city’s housing stock was built in the 1950s through 1970s, and those ranch homes were designed with one return in the hallway. Then someone converted a carport into a bonus room or added a rectangular addition over the garage. The Lennox system was sized for the original footprint. Now it’s short-cycling, sweating, and struggling to pull air from rooms it was never meant to serve.

Our tech found an early-2000s Lennox XC13 struggling in a Powder Springs Street ranch addition: the 3-ton outdoor unit was running 45-minute cycles because the original hallway return couldn’t pull from the new bonus room. We added a dedicated 10-inch return, replaced a failed dual capacitor, and recharged the system to spec. After that, the room held 72°F at 52% RH even during a July thunderstorm.

That’s the kind of fix you won’t get from a company that just swaps parts. It’s understanding how Marietta’s homes actually behave.

Lennox Models & Products We Service in Marietta

We work on the full Lennox residential range. That includes the Dave Lennox Signature Collection with XC21, XC25, and SLP98V units, the Elite Series with XC13, XP13, and EL296V, the Merit Series with ML180 and ML14XP1, and legacy G26 and G40 furnaces still running in plenty of Marietta homes.

Parts matter on Lennox equipment. We install genuine Lennox OEM parts by default: capacitors, ignitors, gas valves, and ECM motors. Aftermarket alternatives on variable-speed and modulating systems often trigger fault codes, and we’d rather fix it once than chase a mystery error. When a compressor or heat exchanger fails on a 15-plus-year-old system, we quote repair versus replacement with current Marietta efficiency rebates and your duct realities in mind. We don’t pad toward replacement when a repair makes more sense.

Lennox Service Pricing in Marietta

FAQs – Lennox HVAC in Marietta

Why does my Lennox XC13 AC unit keep tripping the breaker during Marietta thunderstorms?
Your XC13 is almost certainly pulling excessive amps because of a failing capacitor or a compressor drawing too much on startup. Marietta’s frequent summer lightning and power surges make this common. The fix is usually a new OEM capacitor or a hard-start kit, and in some cases a compressor that’s nearing the end. Call (762) 240-5599 and we’ll diagnose it in one visit.

Should I convert my 1960s ranch with a Lennox furnace to a heat pump to handle the brief Marietta freezes?
If your home has single hallway returns and original undersized ductwork, a heat pump is often a smart fit. But the ductwork should be addressed, not ignored. A dual-fuel setup gives you cooling and heat pump warmth with our Furnace Repair in Marietta as backup for the hard freezes. We’ll quote it honestly with your ducts in mind. Call (762) 240-5599 for the numbers.

Is a Lennox variable-speed air handler worth it if my East Cobb home has original 1980s flex ducts?
A variable-speed air handler is a great piece of equipment, but if the flex ducts are collapsed or undersized, you’re asking it to breathe through a straw. The motor will fail early. If you can improve the ducts or replace the worst sections, the variable-speed unit shines. If not, a single-stage unit is the better call. We’ll tell you which path fits your home. Call (762) 240-5599.

Why does my Lennox G26 furnace run for a few seconds then shut off when the temperature drops at night?
That’s classic flame sensor failure. In Marietta’s crawlspace homes, moisture corrodes the sensor, and the furnace can’t confirm ignition, so it locks out. Sometimes cleaning works short-term, but a corroded G26 sensor typically needs replacement. It’s a straightforward repair. Call (762) 240-5599 and we’ll have it sorted.

Can you recharge my Lennox R-410A system if it’s low, or does it need the whole coil replaced?
It depends on where the leak is. Many early-2000s Lennox attic coils leak at the tube sheets from formicary corrosion and need replacement. A small leak at a braze joint or Schrader valve can be repaired and recharged. We’ll find the leak and tell you straight what’s needed. Call (762) 240-5599 for an exact diagnosis.

Service Areas Near Marietta

We serve all of Marietta, from East Cobb to the Square and out toward Kennesaw Mountain. Our Lennox service also covers nearby Lennox service in Roswell and Lennox service in Woodstock, plus Dallas, Holly Springs, and North Decatur. If you’re within a short drive of Marietta, chances are we’re already working in your neighborhood.

Book Your Lennox Service in Marietta Today

Call (762) 240-5599 and a live person answers, 24 hours a day, seven days a week. No voicemail trees. No waiting until morning. Tell us what your Lennox is doing, and we’ll give you a straight answer and a written price before any work starts. Same-day service is available for urgent repairs.

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