Lennox HVAC Service Nationwide | Dalton Heating & Air Alpharetta

Why Alpharetta Homeowners Choose Lennox HVAC

Dalton Heating & Air Alpharetta provides independent Lennox service in Alpharetta, from emergency repairs to full system replacements. We work on Lennox equipment daily, including the Elite, Merit, and Signature lines, so we know these systems’ specific failure points without leaning on manufacturer hotlines. We are not a Lennox-authorized dealer or factory service center, and we say that plainly. What we are is a crew that has spent years fixing Lennox systems in Alpharetta’s heat and humidity, with written pricing before any work starts and a full-year written guarantee on every repair. Call (229) 537-2086 when your Lennox system acts up.

Call (229) 537-2086

Lennox builds solid equipment. The Dave Lennox Signature Collection, with models like the XC25 air conditioner, represents some of the most efficient residential cooling on the market. That efficiency comes with complexity, though, and complexity fails in predictable ways. In Alpharetta, we see those failures amplified by our climate: long cooling seasons, high humidity, spring pollen that clogs condensate drains, and summer thunderstorms that knock out power and scramble inverter boards. Knowing the equipment is half the job. Knowing how Alpharetta’s weather stresses it is the other half.

Key Takeaways:

• Dalton Heating & Air Alpharetta is an independent Lennox service provider, not an authorized dealer. This means we recommend what actually fixes the problem, not what a manufacturer program tells us to sell.
• We service all major Lennox lines: Merit, Elite, and Signature, including iComfort communicating thermostats.
• Every repair includes a written price before work begins and a written one-year guarantee.
• We stock common Lennox parts locally in Alpharetta for same-day fixes on most capacitor, contactor, and drain issues.

Why Trust Dalton Heating & Air Alpharetta for Your Lennox HVAC?

Lennox systems are not generic. A Merit Series ML14 condenser and a Signature Series XC25 may both say “Lennox” on the cabinet, but they are entirely different animals inside. The ML14 uses a single-stage compressor and a straightforward control board. The XC25 is a variable-capacity inverter system that communicates digitally between the thermostat, indoor unit, and outdoor unit. A technician who treats them the same will misdiagnose the XC25 half the time. Our techs work on both, and everything in between, every week in Alpharetta.

Marco Benitez, owner of Dalton Heating & Air Alpharetta, picked up his HVAC fundamentals at Los Angeles Trade-Technical College before relocating to Georgia and putting in years of field work across the metro area. He has been servicing homes in Alpharetta for years now, including neighborhoods around Windward, where a poorly sized or misdiagnosed system will run your electric bill through the roof every August. When a Lennox system fails, Marco walks the homeowner through exactly what failed and why before quoting a single dollar. That is how we do business. The price is in writing before any wrench turns.

Every Dalton Heating & Air Alpharetta technician arrives background-checked and uniformed. The call is answered by a live person, 24/7. And every repair carries the 365-Day Done Right Promise: if the fix does not hold, we return at no charge. That is The Garrison Standard, and it applies to every Lennox job we take.

Common Lennox HVAC Problems We Fix in Alpharetta

These are the calls we actually run on Lennox equipment in Alpharetta. Not the generic “your AC isn’t cooling” list every website copies. These are the specific failure patterns we see on specific Lennox lines.

• Inverter board lockouts on Signature Series XC25/XP25 systems. The XC25 and XP25 use an outdoor inverter board to vary compressor speed. After a thunderstorm or a power blink, that board will sometimes trip a lockout code and refuse to restart the compressor. The unit still has power, the thermostat still lights up, but no cooling. Power cycling sometimes clears it, but if the board has been hit by a surge, it needs a replacement. We carry the diagnostic process to determine which one it is before quoting the repair.
• iComfort thermostat communication failures. The iComfort S30 and E30 thermostats communicate digitally with the indoor and outdoor units over a four-wire connection. When the thermostat loses Wi-Fi or drops communication, the system often defaults to a safe mode and runs the fan constantly or shuts down entirely. In Alpharetta, we see this most after power outages, when the thermostat and the equipment boards lose their handshake. Re-pairing sometimes fixes it. A damaged thermostat or control board requires replacement.
• Evaporator coil leaks from formicary corrosion. This is the big one, and Alpharetta’s humidity makes it worse. Lennox evaporator coils on Elite Series air conditioners and heat pumps from roughly five to eight years old are known to develop pinhole leaks from formicary corrosion, a chemical reaction caused by volatile organic compounds in household air. The leak is often so small the system loses refrigerant slowly over a season, so you notice rising run times and weak cooling rather than a sudden failure. The honest fix is usually a replacement coil, not a refrigerant recharge alone, because the leak will keep leaking.
• Upflow furnace drain pan cracks and float switch faults. On Lennox Elite and Merit furnaces installed in humid crawlspaces and attics across Alpharetta, the plastic drain pan under the evaporator can crack over time from heat cycling. When it cracks, water drips onto the secondary float switch, which trips and shuts the system down to protect your ceiling. Homeowners often mistake this for a dead furnace. The real repair is a new drain pan and a correct slope on the drain line, not repeated float switch resets.
• Short-cycling from pitted contactors and swollen capacitors. This is the bread-and-butter repair on Lennox Merit and Elite condensers. The contactor is the electrical switch that pulls in when the thermostat calls for cooling. The points arc and pit over time, especially in Alpharetta’s long cooling seasons. The run capacitor, which gives the compressor and fan motor their starting torque, swells and loses microfarad capacity. The result is the outdoor unit clicking on and off every few minutes. Left alone, it takes out the compressor. Replaced early, it is a $150 to $350 repair.

On a July afternoon in Alpharetta, our tech diagnosed an Elite XC16 air conditioner short-cycling. The Lennox iComfort thermostat showed a “low voltage” alert, but the real culprit was a pitted contactor and a swollen run capacitor. We replaced both with OEM-rated parts, verified the inverter board was not damaged, and got the home back to 72 degrees in under two hours. That is the difference between reading a fault code and actually finding the fault.

Lennox Parts & Our Repair-vs-Replace Approach

We make a distinction that matters to your wallet. When a repair involves the Lennox communicating system, safety limits, or any warranty coverage, we use genuine Lennox OEM parts. The iComfort control boards, inverter drives, and communicating thermostats are proprietary; aftermarket substitutions either do not work or introduce problems that cost more later. For older out-of-warranty units, the math changes. Quality aftermarket capacitors, contactors, and inducer motors often perform just as well as OEM at a lower price, and we will tell you when that is the case.

We stock common Lennox parts locally in Alpharetta: capacitors, contactors, drain pans, float switches, igniters, flame sensors, and pressure switches. That means most capacitor and contactor repairs are done the same day. For less common items like inverter boards or specific coil sizes, we order from our local supply houses and typically have the part within one to two business days.

The honest repair-or-replace conversation happens when a big-ticket component fails. If a compressor or heat exchanger goes on a Merit Series system over 12 years old, we show you the numbers. A compressor replacement on an aging ML14 might cost $2,000 or more, and you still have a 12-year-old system with aging coils and controls. For many Alpharetta homeowners, the better move is applying that money toward an Elite Series replacement with a fresh 10-year parts warranty. We do not push replacement when a $250 capacitor fix gets you several more seasons. We show you the math and let you decide.

If your Lennox needs AC Repair in Alpharetta, call (229) 537-2086. We will tell you what it costs before we touch a wrench.

Our Lennox Service Process – Step by Step

1. 1
   Diagnosis. The tech arrives inside the stated window, background-checked and uniformed. We listen to what the system is doing, then test: line voltage, refrigerant pressures, capacitor microfarads, thermostat communication, and fault codes on iComfort and inverter boards. The diagnosis is specific. We do not guess at a circuit board when the contactor is pitted.
2. 2
   Written price, then the repair. Before any work starts, we put the price in writing. That price is the price. It does not change after the unit is apart. If the repair requires Lennox OEM parts, we tell you that and explain why an aftermarket substitute would be a bad idea in that situation.
3. 3
   The fix, done by the book. We replace the failed component, check the system’s operating pressures and temperatures, and verify the thermostat is communicating correctly. For Lennox inverter systems, that means making sure the outdoor unit and indoor unit are talking properly after the repair, not just that the fan spins.
4. 4
   Testing and documentation. We run the system through a full cooling or heating cycle. We record supply and return temperatures, refrigerant pressures, and any fault codes before and after. You get a written summary of what failed, what we replaced, and what the readings are after the repair.
5. 5
   The guarantee. Every repair carries the 365-Day Done Right Promise, in writing. If the same repair fails within a year, we return at no charge. That is not an upsell. It is included with every service call.

Lennox Products We Service & Install in Alpharetta

We service and install the full Lennox residential range in Alpharetta. The Merit Series (ML14/ML17) is the builder-grade line we commonly see in 1,500 to 2,500 square foot homes. It is straightforward, single-stage equipment, and it ages predictably. The Elite Series (XC/XP 16-20) steps up efficiency with two-stage compressors and better sound ratings, and it is a popular choice for Alpharetta homeowners replacing aging systems. The Signature Series and Dave Lennox Signature Collection (XC25/XP25) represent the top end: variable-capacity inverter compressors, communicating controls, and SEER ratings above 20. These systems deliver excellent comfort and humidity control in Alpharetta’s muggy summers, but they demand a technician who understands inverter diagnostics, not just line voltage and refrigerant.

We also install Lennox furnaces, heat pumps, and air handlers, including variable-speed indoor units paired with communicating thermostats. For repairs, we stock common OEM capacitors, contactors, igniters, flame sensors, and drain components locally, which keeps most Alpharetta service calls to a single visit.

We Also Service These Brands

Lennox is a focus for us, but it is not the only equipment we see. Dalton Heating & Air Alpharetta is factory-trained on nine major residential brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. If you have a Carrier Infinity system in the downstairs zone and a Lennox XC16 upstairs, that is a normal day for us. We diagnose each system on its own terms.

FAQs – Lennox HVAC Service in Alpharetta

Book Your Lennox Service in Alpharetta, GA

If your Lennox is acting up in Alpharetta, call (229) 537-2086. A live person answers, 24/7. We will schedule a window, show up on time, diagnose the problem specifically, and put the repair price in writing before any work starts. The repair carries a full-year written guarantee. That is the deal, every time.

Written by Marco Benitez, Owner at Dalton Heating & Air Alpharetta, serving Alpharetta since 2003.