Seasonal tune-up and full diagnostic on your Carrier, Trane, or Goodman system - readings shown to you before any repair is proposed
Diagnosis first, numbers second - you approve the repair price before a single part goes in.
Before
After
Before
After
Before
AfterFast, Reliable Furnace Repair Across Marietta
Most furnace repairs in Marietta run $150-$700 and our Furnace Repair team can usually diagnose the problem same day. Call (817) 402-2972 anytime; a live person answers the phone 24 hours a day, 7 days a week, and we’ll give you a firm arrival window before the technician heads your way.
We’ve been working in Marietta long enough to know the difference between a historic Marietta Square Craftsman with a tight crawlspace and a 1970s brick ranch off Delk Road with flex duct that’s been baking in the attic since the Carter administration. That local knowledge matters because the same furnace symptom, a high-limit switch tripping, can mean a failed igniter in one house and a ductwork suffocation problem in another. Our crews dispatch from the Atlanta office and carry parts for Trane, Lennox, Carrier, and Goodman systems on every truck, so we’re not making a second trip because we guessed wrong on the part.
Why Coldharbour Heating & Air Is Marietta’s Preferred Furnace Repair Company
Coldharbour Heating & Air was founded in 2003 as an independently owned and operated member of the Kingswell network, and we’ve built our reputation in Cobb County on four written promises that most competitors won’t put on paper: a price before the work starts, a firm arrival window, a clean job site, and our 365-Day Done Right Promise. If a repair fails within a full year, we come back and correct the work at no charge. That guarantee is written down before the technician leaves, not offered as a verbal afterthought.
Homeowners in East Marietta, West Cobb, and around Kennesaw Mountain know our technicians by the uniform and the background-check badge. We’re not sending a subcontractor you’ve never met. The technician who walks through your door is trained on nine major residential HVAC brands including Rheem, Trane, Lennox, and Goodman, and carries the parts to fix most failures on the first visit. Our phones are answered by a live person around the clock, every day of the year. No voicemail trees, no “call back in the morning” when your heat goes out on a January night.
Furnace Maintenance in Marietta
Furnace Maintenance in Marietta is not a luxury in this climate; it’s how you avoid waking up to a cold house when a hard freeze rolls through Cobb County. Our tune-up covers combustion analysis, heat exchanger inspection, igniter testing, blower amp draw, and a full filter and duct-pressure check. Most Marietta homeowners schedule this in early fall before the first freeze, and the service runs $80-$200 with a written report of everything we found.
What We Check in Older Systems
The 1970s-80s Lockheed-era brick ranches that dominate Marietta’s housing stock often still run their original flex-duct systems through unconditioned attics. During maintenance, we measure static pressure and inspect those attic runs for delamination, the separation of the duct liner that leaks heated air and starves the furnace of return airflow. Catching this early prevents the high-limit cycling that kills heat exchangers.
Humidity and Freeze-Prep Focus
Marietta’s humid subtropical climate means summer dew points in the low-to-mid 70s°F, and that moisture load affects furnace components year-round. We pull and inspect the blower assembly for mold and dust compaction, check the condensate drain on 90% efficient furnaces, and verify that heat pump changeover controls are ready for the ice storm events that Cobb County sees more than coastal Georgia markets.
Heat Pump Repair in Marietta
Heat Pump Repair in Marietta covers the full range of dual-fuel and all-electric systems that handle both cooling and heating through our mild winters and brutal summers. When outdoor coils ice up during hard freezes, or when the reversing valve sticks in cooling mode in January, we diagnose whether the issue is refrigerant charge, defrost control, or the auxiliary heat strips that Cobb County homeowners rely on during ice events. Heat pump repairs fall within our standard $150-$700 range, and we stock defrost boards, reversing valves, and coil sensors for faster turnaround.
Coastal-Influenced Corrosion
Marietta sits far enough inland that salt corrosion isn’t the crisis it is on the coast, but Piedmont humidity still accelerates fin degradation and cabinet rust on outdoor units. We see condenser coils restricted by corrosion debris that overheats compressors and forces premature heat-pump changeover to expensive resistance heat. Our technicians clean with foaming agents that won’t damage coated coils, and we’ll tell you honestly when a corrosion-resistant replacement coil is worth the premium versus another repair.
Split-Level Zoning Complications
The split-level homes built during Marietta’s East Cobb expansion present a recurring challenge: one heat pump serving both the sunken living area and upper bedrooms fights constant static-pressure imbalance. The system overheats trying to push air upstairs, then short-cycles when the downstairs stat satisfies. We measure airflow room by room and can recommend duct modifications or zoning dampers that reduce equipment strain and even out temperatures.
Trusted Brands We Service in Marietta
Our technicians train continuously on Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard, but in Marietta we see Trane, Lennox, and Goodman most often in the Lockheed-era subdivisions. We stock igniters, gas valves, blower motors, and control boards for these brands on every truck, and our Atlanta-area parts supplier can have same-day or next-morning delivery on less common components. That matters when a Friday night failure threatens to leave your family cold through a weekend freeze. We don’t guess at compatibility; we cross-reference model and serial numbers before we leave the shop.
Common Furnace Repair Problems We See in Marietta Homes
- Corroded condenser coils and cabinets on outdoor units. Coastal-influenced air and Piedmont humidity accelerate fin and cabinet corrosion, causing restricted airflow that overheats compressors and trips heat-pump changeover to emergency heat. We clean what we can and recommend coated-coil replacements when corrosion has progressed too far.
- Flex-duct delamination in 130°F+ attics. Original ductwork in 1970s-80s brick ranches leaks so badly that furnaces short-cycle on high-limit, not on thermostat demand. The furnace runs, overheats, shuts down, and repeats until the heat exchanger cracks or the homeowner calls us.
- Split-level static-pressure mismatch. One system serving both sunken living areas and upper bedrooms creates chronic hot-upstairs/cold-downstairs cycling that stresses the heat exchanger and blower motor. In the East Marietta split-levels off Allgood Road, we’ve repeatedly seen undersized returns choke down airflow and starve combustion air, tripping the high-limit switch and cycling the burners. After one such call, we ran a load calculation, upsized the return, and the Carrier 58-series furnace cycled cleanly all winter.
- Failed igniters in high-cycling systems. When duct problems or dirty filters force a furnace to start and stop repeatedly, the hot-surface igniter accumulates thermal stress and fails prematurely. We replace the igniter, but we also find and fix the root cause so you’re not paying for the same repair twice in one season.
Pricing for Furnace Repair in Marietta, GA
We believe you deserve to know what furnace repair costs before a tool comes out of the truck. Here’s what we charge in the Marietta market:
| Service | Price Range |
|---|---|
| Furnace Repair | $150-$700 |
| Furnace Tune-Up | $80-$200 |
Most repairs fall in the $200-$400 band: igniter replacements, flame sensor cleaning, blower capacitor swaps, and limit switch replacements. Higher-end repairs involve heat exchanger work, blower motor replacement, or control board failures. The written price we hand you before work begins includes all parts, labor, and diagnostic time. It does not change at the door. That’s The Kingswell Way, not a special promotion. We also handle Furnace Repair in Marietta for homeowners comparing quotes, and we’re happy to explain why a $150 repair might solve your problem or why a $650 repair is the honest recommendation.
We Also Serve Cities Near Marietta
Our service radius extends throughout Cobb County and into neighboring communities. We regularly dispatch to Smyrna, Kennesaw, Powder Springs, and Atlanta, with the same written pricing, the same 365-Day Done Right Promise, and the same live-answer phone coverage. Whether you’re in a historic bungalow near Marietta Square or a newer build in West Cobb, the technician who arrives will know the local housing stock and the specific failure modes it produces.
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 About Furnace Repair in Marietta
Yes, because the auxiliary heat strips and defrost controls are part of your furnace-air-handler assembly. When ice builds on the outdoor coil, the defrost board should trigger a reversal to melting mode; if it fails, the system locks in ice and your backup heat strips carry the full load. We test defrost initiation, check refrigerant charge, and inspect the heat strips for damage from overuse. Call (817) 402-2972 before the next freeze - estimates are free.
Because the original duct design in 1970s-80s split-levels often cannot move enough return air to keep the heat exchanger cool. The furnace overheats, the high-limit switch opens as a safety, and the burners shut down until the exchanger cools. We measure static pressure, inspect flex-duct condition in the attic, and calculate whether upsizing the return or adding a second return path solves the problem without equipment replacement.
Absolutely. The original furnaces in Lockheed-era homes were sized by rule-of-thumb, not by actual heat loss, and many are dramatically oversized. A Manual J load calculation tells us what size you actually need, which affects duct sizing, equipment selection, and your gas bill for the next 20 years. We perform this calculation as part of every replacement quote in Marietta.
Probably the ductwork, or both. Marietta’s humidity accelerates corrosion on the igniter surface, but repeated high-limit cycling from restricted airflow is what thermally shocks the igniter and causes premature failure. We replace the igniter and then measure temperature rise and static pressure to find out why it failed. Fixing only the igniter guarantees you’ll see us again next winter.
Once yearly, in early fall before the first hard freeze. Marietta’s humidity means blower assemblies and condensate drains need annual cleaning, and our periodic ice storms mean defrost controls and heat strips must be tested before you depend on them. The $80-$200 tune-up price includes a written report of everything we found, and our technicians are not paid on what they sell - so the recommendation you get is the one we’d make to our own neighbors.
Written by Victor Mancini, Owner at Coldharbour Heating & Air, serving Marietta since 2003.