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Get your free estimateLennox HVAC in Kennesaw, GA | Dalton Heating & Air Sandy Springs
We service Lennox heating and cooling systems across Kennesaw, from the 30-year-old R-22 condensers still running in Legacy Park to the builder-grade equipment stacked into new subdivisions near Kennesaw State University. Independent Lennox service means we diagnose what’s actually failing and put the repair price in writing before any work starts. Marco Benitez leads our crew, and he’ll be the first to tell you that a Lennox unit in Kennesaw sees damage patterns that a Lennox in Sandy Springs or Candler-McAfee rarely does. If your Lennox is acting up, call (478) 400-5908, and we’ll tell you what it’s doing, what it’ll cost, and when we can fix it. Learn more about our Lennox sales & service work across the metro.
Why Kennesaw Residents Choose Us for Lennox Service
We’re not a Lennox dealer, and we don’t pretend to be. What we are is an independent shop that has worked on enough Lennox systems to know where they fail and why. Our techs cut their teeth on Lennox’s proprietary communicating boards and variable-speed algorithms, and we carry the diagnostic protocols for legacy R-22 Lennox systems that most shops have abandoned. A Lennox iComfort thermostat that won’t re-pair after a voltage blip? A G71 furnace throwing pressure-switch codes because the condensate trap is sludged up from Kennesaw’s humid spring air? If you need Kennesaw AC Repair, We’ve seen both enough times to know the fix before we ring the doorbell.
Marco Benitez grew up in East Los Angeles and picked up his HVAC fundamentals at Los Angeles Trade-Technical College before spending the better part of two decades working systems across the Southeast. He’s walked homeowners through exactly what failed, why it failed, and what the written price will be before a single bolt turns. That’s how we operate under The Garrison Standard, and it’s why people across the Kennesaw service area call us back for their spring tune-ups and emergency repairs.
Styles & brands we work with
Common Lennox HVAC Problems We Solve in Kennesaw
- Pressure-switch fault codes on G61 and G71 furnaces. Kennesaw’s humid spring air fills condensate traps with sludge faster than the drain line can clear it. When the trap clogs, the furnace pressure switch reads incorrectly and locks out the burner. We clear the trap, flush the drain line, and verify the pressure switch actually works before putting it back in service. Throwing a new switch at a clogged trap just wastes your money.
- Short-cycling on XC21 and XC25 condensers. In slab-on-grade homes around Legacy Park, the original return duct is often undersized for a variable-speed blower. The blower starves for airflow, the board sees a false fault, and the condenser shuts down early. The fix is usually ductwork, not a compressor swap. We measure static pressure before recommending anything.
- iComfort thermostat wi-fi failure. Kennesaw gets voltage blips from summer thunderstorms and aging subdivision transformers. When the power dips, many Lennox iComfort stats lose their wi-fi calibration and refuse to re-pair without a hard reset at the air handler. That’s a frustrating fix in a tight attic, but we do it routinely.
- Pinhole leaks in pre-2010 R-22 evaporator coils. Along the I-75 corridor, vibration from highway traffic and pollen fines from Kennesaw’s spring bloom eat the aluminum at the tube-sheet joints. Coils from this era develop pinhole leaks that are easy to miss and expensive to ignore. If your Lennox from before 2010 is losing refrigerant with no obvious cause, the coil is the first thing we check.
- Builder-grade duct problems near KSU. Newer Lennox heat pumps in subdivisions around Kennesaw State University frequently suffer from ductwork that was sized for the cheapest bid, not the equipment. That means uneven cooling, noisy registers, and furnaces that run constantly. We see this more in Kennesaw than any other city we serve.
Lennox Service in Kennesaw: What Local Conditions Mean for Your Equipment
Kennesaw’s Legacy Park and Cedar Crest subdivisions still have hundreds of original Lennox HS26 and Elite 11 R-22 condensers running past their rated life. The city’s 2014 ban on new R-22 equipment means a leak here often forces a full system replacement rather than a simple recharge. That’s a different conversation than homeowners in Sandy Springs or Candler-McAfee are having, where newer construction means fewer R-22 holdouts. In Kennesaw, the math changes: if your Lennox from 1995 is leaking, patching the coil buys you maybe two seasons before the compressor fails. At that point, the recharge cost is money down a hole. We’ll show you both options with written numbers and let you decide. Most homeowners in Legacy Park end up replacing once they see the repair-versus-replace cost side by side, but we’ll never push you into a new system if the old one still has life. When replacement makes sense, we also offer our Heat Pump Installation in Kennesaw.
Last July we pulled a Lennox XC21 compressor short-cycling in Legacy Park off Willow Creek Drive. The customer complained about uneven cooling upstairs, so our tech checked the return static and found the original 14-inch flex duct crushed and pulling 0.9 inches of water, starving the variable-speed blower. We upsized the return to 18 inches, replaced the clogged filter, and reset the iComfort board’s airflow tables. No more code 292 and a 6-degree drop upstairs.
Lennox Models & Products We Service in Kennesaw
We work on every Lennox line that shows up in Kennesaw homes: the Elite Series, Signature Series, Merit Series, and the Dave Lennox Signature Collection. Older units like the HS26 and Elite 11 are our bread and butter. For parts, we stock OEM Lennox flame sensors, inducer motors, and control boards for repair speed. When an OEM part fails early under Kennesaw’s voltage sags, we’ll install a heavy-duty aftermarket capacitor or contactor that holds up better. We never throw parts at a compressor. If it’s grounded or the windings are burned on a pre-2010 unit, we tell you honestly and walk you through the replacement numbers instead of patching an R-22 relic.
See the difference
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After
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Before
AfterLennox Service Pricing in Kennesaw
Here’s what Lennox work actually costs in Kennesaw, based on the jobs we run every week:
| Service | Typical Price Range |
|---|---|
| Lennox AC Repair | $150 – $650 |
| Lennox Furnace Repair | $150 – $700 |
| Lennox AC Installation | $3500 – $7500 |
| Lennox Heating/Cooling Tune-Up | $80 – $200 |
What drives the cost is the part and the diagnostic time. A capacitor on a Merit Series condenser takes 45 minutes and runs under $250. A control board on an XC25 runs $400 – $600 because the OEM board isn’t cheap, and the install requires re-pairing the iComfort stat. Every quote includes the diagnostic, the part, the labor, and the written price before we touch the unit. A free estimate means we show up, diagnose, and hand you a number you can keep. Call (478) 400-5908 and tell us what your Lennox is doing.
Serving Kennesaw, GA - Our Local Coverage Area
We’re based in the Kennesaw 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 Kennesaw
The pressure switch code almost always traces back to a clogged condensate trap, and Kennesaw’s humid spring air makes that trap sludge up fast. When the trap can’t drain, the pressure switch reads a false negative and locks out the burner. The fix is to clear the trap and flush the line, not to replace the switch. If your furnace does this every spring, a condensate line treatment during the fall tune-up usually prevents it. Call (478) 400-5908 and we’ll clear it the same day.
We can, but honestly, you should know the math before you spend the money. R-22 refrigerant is expensive and getting harder to source, and a recharge on a 25-year-old system often means a coil leak that will drain the refrigerant again within a season or two. With Kennesaw’s 2014 ban on new R-22 equipment, a leaking HS26 usually points toward replacement, not repair. We’ll diagnose the leak, show you the cost of patching versus replacing, and give you a written price for either path. Call (478) 400-5908 for a straight answer on your specific unit.
Most often, it’s the ductwork, not the condenser. Homes around KSU and several newer Kennesaw subdivisions were built with duct systems sized for the lowest bid, not for a variable-speed blower that needs a certain air volume to run properly. The blower starves, the board throws a fault, and the system shuts down early. We measure static pressure first, and if the return is undersized, we fix the duct, not the condenser. Call (478) 400-5908 to schedule a static-pressure check.
Yes, and we also fix them when replacement isn’t necessary. A lot of iComfort stats just need a hard reset at the air handler after a power blip, which is a 20-minute fix. If the board inside the stat is genuinely dead, then we’ll sell you a new one and pair it properly with the air handler and condenser. We’ll give you the way cheaper option first, because that’s the kind of shop we run. Call (478) 400-5908 and describe what the screen is showing.
A capacitor is the component that gives the compressor and fan motor the kick they need to start. In Kennesaw, voltage sags from aging subdivision transformers and summer storm activity cause capacitors to fail more often than they would in a city with newer infrastructure. A failing capacitor makes the unit hum but not start, or the fan spins slowly. We stock OEM Lennox capacitors and heavy-duty aftermarket units when the OEM part fails early. Most capacitor replacements run under $250. Call (478) 400-5908 and we’ll check it the same day.
Service Areas Near Kennesaw
We run Lennox service calls across Kennesaw and into the surrounding metro. Our primary service area includes Sandy Springs, Candler-McAfee, Druid Hills, Mountain Park, and Gresham Park. If you’re in one of those neighborhoods and your Lennox is acting up, we’re already on the road there most weeks. See our Lennox service in Candler-McAfee page or our Lennox service in Sandy Springs page for details on those areas.
Book Your Lennox Service in Kennesaw Today
Call (478) 400-5908. You’ll get a live person on the phone, not a voicemail queue. Same-day appointments are available for failing AC and furnace repairs across Kennesaw. The diagnostic is free, the price is in writing before we start, and the repair is guaranteed in writing for a full year.
Written by Marco Benitez, Owner at Dalton Heating & Air Sandy Springs, serving Kennesaw since 2003.