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Get your free estimateLennox HVAC in Marietta, GA | Brandt HVAC Co Marietta
If your Lennox system is acting up in Marietta, here’s the short answer: we’re an independent Lennox service provider, not a factory-authorized dealer, and we fix these systems every day across this city. The thing that makes our Lennox work different here is that we know exactly how Marietta’s 1960s-1980s housing stock and humid, thunderstorm-heavy climate stress Lennox equipment. That means faster diagnoses, fewer return trips, and a written price before any work starts. Call us at (478) 662-5175 and you’ll get a live person, not a phone tree.
Our techs have spent years working on Lennox gas furnaces, heat pumps, and air conditioners in Marietta homes, from legacy G26 and G51 furnaces to modern XC and XP series units. Devin Marlowe, our owner, learned the trade at Los Angeles Trade-Technical College and has spent the better part of three decades working on HVAC systems across the South. He and his crew have logged more service calls in the Kennesaw Avenue corridor near Marietta Square than we can count. When you call us, you get that experience, plus a background-checked, uniformed technician introduced to you by name and photo before they ever knock on your door. We invite you to explore our full Lennox sales & service page for a broader look at how we work with this brand.
Why Marietta Residents Choose Us for Lennox Service
Lennox equipment has its own quirks, and a tech who mostly sees other brands can misread them. A G26 furnace that short-cycles isn’t the same as a Goodman doing the same thing. A Lennox XP13 heat pump that won’t hold a charge needs a different diagnostic path than a Rheem. We have serviced enough Lennox systems across Marietta service area zip codes to know what fails, when it fails, and what actually fixes it the first time.
Every Brandt HVAC technician is background-checked, identity-verified, and badged under our Threshold Verified standard. Before a visit, you receive the tech’s name and photo. At the door, they show a photo ID badge. If someone arrives who you were not told to expect, that visit is on us and we make it right. That’s the kind of certainty we believe every homeowner in Marietta deserves, especially if you’re home alone or have kids in the house.
We use OEM Lennox parts for critical components like control boards, gas valves, and thermostats, because that’s what keeps system compatibility and warranty coverage intact. For wear items like capacitors and contactors, we offer quality aftermarket options when they make reliability and cost sense. Either way, you get a written price before the work begins, and a written guarantee on every repair. If that repair fails within the guarantee period, we return free of charge, covered by our 365-Day Done Right Promise.
Styles & brands we work with
Common Lennox HVAC Problems We Solve in Marietta
- Flame sensor fouling and ignitor failure on G26/G51 furnaces. Marietta’s mild shoulder seasons mean furnaces sit idle for months, and moisture plus dust builds up on the flame sensor. First cold snap, the furnace lights, runs, then trips. We clean or replace the sensor and test the ignitor, and the system runs steady again.
- Run capacitor degradation on XP13/XP14 heat pumps. Frequent summer cycling in Marietta’s heat, plus voltage dips from afternoon thunderstorms, wears down capacitors faster than you’d see in a cooler climate. A failing capacitor makes the compressor hum or the fan refuse to start. We stock common replacements locally and can usually get you back running the same day.
- Evaporator coil corrosion on XC14/XC16 air conditioners. High indoor humidity in Marietta, especially in older crawlspace homes with duct leakage, puts more moisture on the coil than it was designed for. Over time, that leads to corrosion and refrigerant leaks. We fix the leak, recharge the system, and flag the underlying duct issue so it doesn’t come right back.
- Condenser coil blockage from spring oak and pine pollen. Marietta’s late spring pollen is thick enough to coat a condenser coil in a week, not a season. On XC series ACs, that blockage reduces airflow and drives up head pressure, which shortens compressor life. A coil cleaning every spring can add years to the unit.
- Short-cycling and airflow problems tied to undersized ductwork. Many Marietta homes built in the 1960s and 1970s went up with ducts sized for the original equipment. When a modern Lennox system goes in and the ducts stay, the system short-cycles, humidity control suffers, and utility bills climb. We rebalance airflow and correct charge levels so the equipment performs to spec.
Lennox Service in Marietta: What Local Conditions Mean for Your Equipment
The single biggest thing we see in Marietta that you won’t hear about from a generic Lennox page is what we call the “Marietta split.” Those 1970s split-level homes around neighborhoods off Whitlock Avenue and throughout the city often still run original, undersized ductwork. When temperatures drop during a surprise cold snap, that ductwork can’t move enough air, and the heat pump struggles to keep up. The homeowner thinks the Lennox system is failing, but the equipment is often fine. The ductwork isn’t sized for it.
Add to that the fact that Marietta sits inland, away from the moderating effect of the Gulf, so winters get colder than people expect. Single-pane windows and insufficient attic insulation in many of these homes make the problem worse. Our techs regularly rebalance airflow, seal leaking duct joints, and verify refrigerant charge just to get these systems performing to their specification. It’s a Marietta-specific problem with a Marietta-specific fix, and it’s the kind of work we do nearly every week during the heating season.
Lennox Models & Products We Service in Marietta
We service the Lennox equipment most commonly installed in Marietta homes. That includes legacy G26 and G51 gas furnaces, which still run in many of the city’s older ranches and split-levels. We also handle XP13 and XP14 heat pumps, XC14 and XC16 air conditioners, and the Elite series, including CBX32MV air handlers and 13ACX condensers.
For critical components like control boards, gas valves, and thermostats, we use OEM Lennox parts to maintain compatibility and warranty coverage. For capacitors, contactors, and sensors, we offer quality aftermarket options when they’re the right call on reliability and cost. We keep common Lennox-specific parts stocked locally so most Marietta repairs can be completed in a single visit, not a week of waiting on shipments.
See the difference
Before
After
Before
AfterLennox Service Pricing in Marietta
Here are the price ranges we calibrate to the Marietta market. You’ll get a written price before any work starts, every time.
| Lennox Service | Price Range |
|---|---|
| Lennox AC Repair (diagnostic + minor part) | $150 – $650 |
| Lennox Furnace Repair (e.g., ignitor, flame sensor) | $150 – $700 |
| Lennox AC Installation (complete system) | $3,500 – $7,500 |
| Lennox Furnace Tune-Up | $80 – $200 |
What drives cost in Marietta: the age of your system, whether it’s R-22 or R-410A refrigerant, the accessibility of your crawlspace or attic, and whether ductwork needs attention. A free estimate includes a written diagnosis, a line-by-line price, and our recommendation on repair versus replacement, backed by actual numbers, not pressure. Call (478) 662-5175 for an exact quote.
Serving Marietta, GA - Our Local Coverage Area
We’re based in the Marietta area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs – Lennox HVAC in Marietta
The roll-out switch trips because the burners are overheating, and in Marietta the usual culprit is a flame sensor coated with residue from months of disuse, plus a blower wheel packed with dust from crawlspace return air. The furnace sits idle through our mild shoulder seasons, and when the first cold snap hits, everything tries to fire at once. We clean the sensor, clear the blower, verify gas pressure, and the system returns to steady heat. If it’s tripping now, call (478) 662-5175 and we’ll get a tech out.
No. Constant run time with high indoor humidity in Marietta usually points to low refrigerant charge, a dirty condenser coil from oak and pine pollen, or undersized ductwork that can’t move enough air. A correctly charged, clean XP14 should cycle off periodically and pull humidity down. We’ll check charge, clean the coil, and measure airflow to find the actual cause. Call (478) 662-5175 for a diagnostic.
That depends on the model year. Lennox XC14 units manufactured after roughly 2010 run on R-410A. Earlier XC14 units used R-22, which is no longer produced and costs significantly more per pound. We’ll check the data plate on your condenser, tell you which refrigerant your system uses, and give you a written price for the recharge before any work starts. If your system leaks R-22, we’ll also walk you through the math on whether replacement makes more sense than repeated recharges.
It’s a common failure pattern on aging Lennox furnaces, and Marietta’s humidity accelerates it. The inducer motor bearings wear, and moisture in crawlspace and basement areas can cause corrosion that makes the motor noisy or intermittent. If the inducer fails entirely, the furnace won’t fire at all, and that’s a dangerous position during a winter cold snap. We replace inducer motors with OEM Lennox parts. Call (478) 662-5175 and we’ll get it diagnosed quickly.
At least once a year, and ideally in late spring after pollen season peaks. Marietta’s oak and pine pollen load is heavy enough that a condenser coil can clog in a matter of weeks, and a clogged coil on an XC series Lennox drives up head pressure and shortens compressor life. A spring cleaning, plus a fall heating check, keeps the system running efficiently through both extremes. A tune-up runs $80 – $200.
Service Areas Near Marietta
We provide Lennox service throughout Marietta and the surrounding communities. That includes Lennox service in Mableton, Lennox service in Acworth, plus Lithia Springs, Austell, and Scottdale. If your Lennox system is acting up and you’re anywhere in this part of Cobb County or nearby, give us a call.
Book Your Lennox Service in Marietta Today
If your Lennox furnace, heat pump, or air conditioner needs attention in Marietta, call Brandt HVAC Co Marietta at (478) 662-5175. A live person answers, day or night, and we’ll send a named, background-checked technician with a written price before any work starts.
Written by Devin Marlowe, Owner at Brandt HVAC Co Marietta, serving Marietta and the surrounding area.