Furnace & heating
AC repair
Heat pumps
Ductless mini splits
Carrier
Trane
GoodmanSeasonal 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.
Get your free estimateFast, Reliable Furnace Repair Across Kennesaw
Furnace repair in Kennesaw typically runs $150 – $700, and most jobs we handle are diagnosed and fixed same day when parts are on the truck. We also offer Kennesaw AC Repair for cooling issues. We work on furnaces in Legacy Park, homes off Stilesboro Road, and the older neighborhoods near downtown where slab foundations and attic units create problems a generic HVAC company doesn’t anticipate. If your heat is out or your furnace is short cycling, call (762) 240-5599 and a live person answers, day or night.
Kennesaw’s housing stock splits in two directions. There are newer subdivisions with high-efficiency systems, and then there are 1980s and 1990s homes where attic furnaces sit above collapsed flex duct and flue pipes corrode under pollen and humidity. Knowing which one you’re dealing with before a technician arrives saves you money and gets the heat back faster.
Why Cold Harbour Heating and Air Marietta Is Kennesaw’s Preferred Furnace Repair Company
We answer the phone with a live person, 24 hours a day, 7 days a week. That’s been true since Victor Mancini founded the company in 2003 as part of the Kingswell network of independently owned and operated HVAC businesses. When a furnace quits on a 28-degree January night in Kennesaw, you’re not leaving a voicemail and waiting for a callback.
Every repair we do comes with the 365-Day Done Right Promise in writing. If the repair fails inside a year, we return and correct it at no charge. Not a verbal assurance. A written guarantee handed to you before the technician leaves. That’s the Kingswell Way: say the price before the work, show up in the window given, leave the place cleaner than found, put the guarantee in writing, come back if it fails.
Our technicians are background-checked and uniformed, and they’re trained to service nine major residential HVAC brands including Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. We work on whatever system is already in your Kennesaw home, not just the brands we get a margin on. Below, you’ll find details on our Furnace Repair services and how they apply specifically to homes across Kennesaw.
Styles & brands we work with
Furnace Maintenance in Kennesaw
Furnace Maintenance in Kennesaw is not a luxury add-on, it’s the difference between a system that lasts 15 years and one that dies at 10, especially with what Kennesaw’s dense tree cover does to equipment. A tune-up here runs $80 – $200 and catches the problems that turn into $500 repairs: cracked heat exchangers, corroded ignitors, blocked condensate lines, and blower motors straining against dirty coils. Given how hard pollen hits Kennesaw, a fall tune-up before the heating season is the single best dollar you’ll spend on your furnace.
What a Tune-Up Actually Covers
We inspect the heat exchanger for cracks, test the ignitor and flame sensor, check carbon monoxide readings, clean the burner assembly, and measure the temperature rise across the furnace. On attic units common in Kennesaw, we also check the flue pipe for corrosion, because in this climate, that’s a silent problem that trips rollout switches at the worst time. You get a written report of what we found, nothing more.
Why Fall Service Beats an Emergency Call
Furnaces that get annual maintenance fail far less often during the first cold snap, which in Kennesaw is when roll-out switches and ignitors like to quit. Our technicians are not paid on what they sell, so the report is honest. If something is failing, we show you the part and give you a fixed price before any work begins.
Heat Pump Repair in Kennesaw
Heat Pump Repair in Kennesaw gets complicated because many homes, especially in subdivisions off Barrett Parkway, use heat pumps for both heating and cooling. When one isn’t heating in winter, it’s often a reversing valve, a low refrigerant charge, or a defrost sensor, not the compressor. Those repairs generally fall in the $150 – $700 range, and we diagnose them the same day you call.
Heat Pump Reversing Valve and Defrost Issues
A heat pump that blows cold air in winter but runs fine in summer usually points to a stuck reversing valve or a failed defrost sensor. We test both with live readings, not guesswork. If it’s the valve, we tell you what the part costs, what labor costs, and give you that number in writing before we touch a single screw.
Aux Heat and EM Heat Explained
When outdoor temperatures drop below freezing, a heat pump struggles to pull heat from the air, so it activates electric resistance strips as backup. In Kennesaw, we see this on the handful of genuinely cold nights each year. If your EM heat setting has a wiring fault or blown contactor, the system blows cold air. We trace the circuit, not just the symptom.
Trusted Brands We Service in Kennesaw
Our technicians are trained on nine major residential HVAC brands. In Kennesaw, we most often work on Lennox systems in homes along Cherokee Street, Trane units in newer Legacy Park construction, Goodman furnaces throughout Cobb County, and Rheem heat pumps in slab-on-grade homes near Barrett Parkway. We stock ignitors, flame sensors, limit switches, and blower motors for these brands locally, so many repairs are completed on the first visit. If your system is a less common brand, we’ll have the part sourced and return quickly, but we’ll tell you that before we start.
See the difference
Before
After
Before
After
Before
AfterCommon Furnace Repair Problems We See in Kennesaw Homes
- Collapsed flex duct in attic systems. Legacy Park homes built in the 1990s often have original flex duct that has sagged and collapsed, choking airflow to the point that the furnace overheats and shuts down. The fix is a duct reseal, not a new furnace, and it’s a repair our technicians identify with a static pressure test before we ever recommend equipment replacement.
- Corroded flue pipes tripping roll-out switches. Attic furnaces across Kennesaw face flue pipes that corrode faster here because of the combination of high pollen and humidity. When the rollout switch trips during the first cold snap, we check the flue before replacing the switch, because a new switch won’t fix a corroded pipe that keeps tripping it.
- Closet installations overheating in older downtown homes. Furnaces in closets in older Kennesaw homes overheat because louvered doors get blocked by boxes and storage, and the heat exchanger cracks or the wiring harness chars. We find those before the limit switch fails, and we’ll tell you how to keep that closet clear without putting your family at risk.
- Uninsulated floor ducts causing short cycling. Slab-on-grade homes near Barrett Parkway lose heat through uninsulated floor ducts, and the furnace short cycles as it struggles with a load it was never sized for. Short cycling cracks heat exchangers, which is the most serious failure a furnace can have because it can leak carbon monoxide.
Pricing for Furnace Repair in Kennesaw, GA
Here are the price ranges you should expect for furnace work in Kennesaw, based on what we’ve actually charged in this market. A general furnace repair runs $150 – $700 depending on the part and labor involved. An annual furnace tune-up is $80 – $200. Before any repair begins, we hand you a written price. That number does not change at the door, and if the repair fails within 365 days, we return and correct it at no charge.
| Service | Typical Price Range in Kennesaw |
|---|---|
| Furnace Repair | $150 – $700 |
| Furnace Maintenance / Tune-Up | $80 – $200 |
What moves the price: an ignitor replacement on a Lennox in an attic unit runs lower, while a blower motor replacement in a closet installation with restricted access runs higher. We don’t charge overtime for emergency calls, and our estimates are free. Call (762) 240-5599 to get a firm written quote for your Kennesaw home.
We Also Serve Cities Near Kennesaw
Our Furnace Repair team serves Kennesaw and the surrounding Cobb County communities, including Acworth, Marietta, Woodstock, and Powder Springs. Dispatch and scheduling are coordinated from our Atlanta metro office, and crews serve Kennesaw locally. Same live-person phone answer, same written guarantee, same 365-Day Done Right Promise.
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 About Furnace Repair in Kennesaw
Your furnace is shutting off because the high-limit switch is tripping, which almost always means the airflow is restricted somewhere other than the filter. In Kennesaw, the most common cause is collapsed flex duct in attic installations, especially in homes built in the 1990s where the original ductwork has never been replaced. We confirm this with a static pressure test, then reseal the runs so your furnace actually gets the airflow it needs. Call (762) 240-5599 and we’ll diagnose it properly.
Yes, furnace replacements in Kennesaw require a mechanical permit through Cobb County, and closet installations have specific clearance and combustion-air requirements that must be met. We handle the permit paperwork on replacement jobs, and we’ll tell you if the existing closet installation needs modifications before the new unit goes in. Don’t let a contractor tell you a permit isn’t necessary.
Kennesaw’s dense tree cover produces pollen that clogs outdoor heat pump coils and gets drawn into your furnace’s intake, coating the blower wheel, burners, and flame sensor. That buildup reduces efficiency and can cause the flame sensor to fail, which shuts down the furnace. We recommend more frequent filter changes here than in nearby cities, and a seasonal tune-up that includes cleaning the burner assembly and flame sensor.
In Legacy Park, it’s almost always the ductwork. Homes built in that neighborhood often have original flex duct that has collapsed or sagged in the attic, choking airflow to specific rooms while others get plenty of heat. The furnace itself is usually fine. We test static pressure to confirm the diagnosis, then reseal or replace the affected runs. In some cases, we installed a mini-split where ductwork could not be run through a finished ceiling.
If your heat pump is blowing cold air while in EM heat mode, the backup electric heat strips aren’t energizing. That’s typically a blown contactor, a wiring fault, or a failed heat relay. We trace the circuit from the thermostat to the heat strips, find the failure, and give you a written price for the repair. On a cold Kennesaw night, this is a health risk as much as a comfort issue, so we respond fast and fix it same day whenever parts allow.
Written by Victor Mancini, Owner at Cold Harbour Heating and Air Marietta, serving Kennesaw since 2003.