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 AC Installation Across Marietta
AC installation in Marietta runs $3,500 – $7,500 for a complete system, and we typically complete a full replacement in one day. That price includes equipment, labor, new refrigerant lines where needed, and a written warranty registration we handle before we leave the driveway. If you’re sweating through another humid Cobb County summer with a system that can’t keep up, call us at (762) 240-5599 and we’ll give you a written price before any work begins.
We know Marietta’s housing stock because we work in it every week: 1960s ranch homes off Roswell Road, east-side subdivisions along Lower Roswell, older neighborhoods near the Square, and newer builds around Kennesaw Mountain. The ductwork is often the real problem, not the condenser sitting outside. That’s what makes local experience matter.
Why Cold Harbour Heating and Air Marietta Is Marietta’s Preferred AC Installation Company
We’ve been handling AC installation in Marietta homes long enough to know that a Trane or Rheem condenser is only as good as the return air feeding it. Marietta homeowners call us because we don’t just swap a unit and hand over an invoice. We check static pressure, we measure the return side, and we tell you what’s actually happening before we recommend a single piece of equipment.
The 365-Day Done Right Promise is part of every job we do here. If a repair linked to your new install fails within a full year, we come back and correct it at no charge. That’s on paper, not a verbal assurance. We’re independently operated as part of the Kingswell network, which means we answer to the same written standards regardless of which technician walks through your door. A live person answers our phone 24 hours a day, not a voicemail tree.
Victor Mancini leads our Marietta installation work, and every technician on his crew is background-checked and uniformed. You’ll know who’s arriving before they knock.
Styles & brands we work with
Ductless Mini Split Installation in Marietta
Ductless Mini Split Installation in Marietta solves the problem that central air simply can’t reach: converted carports, bonus rooms over garages, finished attics, and that east-side ranch where running new ductwork would mean tearing out drywall. A mini split uses a small outdoor condenser paired with one or more wall-mounted indoor units, connected by a thin refrigerant line instead of ducts. For Marietta homes, it also gives you zone control, which means you can cool just the room you’re using during those long July afternoons when the humidity makes every room feel ten degrees warmer.
Cost for a single-zone mini split installation in Marietta typically lands in the $3,500 – $5,500 range, while multi-zone systems covering three or four rooms run $5,500 – $7,500 depending on the layout. A load calculation is still essential: adding a unit sized by guesswork to a converted garage off Powder Springs Road often leads to short cycling and a muggy room that never quite dries out.
Why Marietta Homeowners Choose Mini Splits Over Duct Additions
When a carport becomes a family room, the original duct system usually can’t handle the extra square footage. Pulling new ducts through a 1960s-era crawlspace is expensive and disruptive. A ductless unit sidesteps the whole problem: it conditions the new space directly, and the existing central system keeps doing what it was sized to do.
We’ve also installed mini splits in Marietta homes where the main system is fine but one room sits above a garage or faces west with no shade. The unit gives that room independent temperature control without rebalancing air across the entire house.
What to Expect During the Install
Most single-zone mini split jobs take one day. We mount the indoor unit, run the line set through a small exterior penetration, place the condenser, pull a vacuum on the lines, and commission the system. The work is clean, and we register your warranty before we leave.
AC Replacement in Marietta
AC Replacement in Marietta usually means retiring a builder-grade condenser that was never sized for the house it was bolted to. The 1980s-to-2000s subdivisions across the east side are full of Goodman, Rheem, and Lennox units that were installed on rule-of-thumb tonnage, often with a hallway-only return. Replacing the outdoor unit without addressing that return side is how you end up with a new system that’s loud, inefficient, and still can’t cool the back bedroom.
A full AC replacement in Marietta runs $3,500 – $7,500. The spread covers equipment efficiency, coil replacement, line set work, and whether we’re also correcting return air. When we replace a unit, we always measure static pressure and check duct sizing; if the return is choking the system, we’ll tell you and give you a written price to correct it before the install begins.
Replacing a Builder-Grade Unit Without Repeating Builder-Grade Mistakes
If your 2005-era home still has its original condenser, there’s a good chance it was never registered for warranty, and the original installer never did a room-by-room load calculation. The result is a system that runs constantly during Marietta’s humid summers and still leaves the upstairs hot. When we replace it, we do the calculation. That’s the difference between a unit that cycles properly and one that fights its own ductwork.
The local climate makes this worse: weeks of 90°F-plus afternoons with dew points in the low 70s put enormous demand on the system. A correctly sized condenser paired with corrected airflow is the only way to get real comfort and humidity control in a Marietta summer.
When Replacement Is the Better Call
If your condenser is more than about 14 years old, has a refrigerant leak, or uses R-22, replace it. Retrofitting an old system to new refrigerant is expensive and rarely worth it. In Marietta, where summer runs long and the cooling season effectively starts in May, you want a new SEER2 system with a registered warranty.
Trusted Brands We Service in Marietta
Cold Harbour Heating and Air installs and services all major residential brands, including Trane, Lennox, Goodman, and Rheem. We stock common parts locally for Marietta customers, which speeds up repairs and replacements considerably. Our technicians are factory-trained on all nine major residential brands, so the team showing up at your door knows your system, not just the one we happen to sell most. That matters when you have a 2004 Goodman still running in a subdivision off Whitlock Avenue and you need honest advice about whether a new condenser will actually fix the upstairs.
Common AC Installation Problems We See in Marietta Homes
- Undersized hallway-only returns in 1950s – 70s ranch homes. The original return in many Marietta ranchers pulls from a single hallway grille. A new high-efficiency condenser will strain for air, run noisier, and never reach the back bedrooms at full capacity.
- Unregistered builder equipment warranties. Many early-2000s Marietta homes still have a condenser that was never registered by the original owner. In our humid summers, coil leaks and capacitor failures are common after the first two seasons, and an unregistered warranty covers far less.
- Converted carports and bonus rooms sized by guesswork. Adding a room without a new load calculation throws the whole system out of balance. You get short cycling, sweaty registers, and a room that never dries out no matter how long the system runs.
- Attic-installed horizontal units that sweat through muggy nights. Marietta’s dew points stay high all summer. Poorly insulated attic air handlers can develop condensation problems that drip onto ceilings and breed mold. A proper install addresses drainage and insulation, not just the equipment.
See the difference
Before
After
Before
After
Before
AfterPricing for AC Installation in Marietta, GA
Here’s what you can expect to budget in Marietta’s market:
| Service | Typical Range |
|---|---|
| AC Installation (complete system) | $3,500 – $7,500 |
| AC Replacement | $3,500 – $7,500 |
| Ductless Mini Split Installation | $3,500 – $7,500 |
Where your job falls depends on equipment efficiency, whether we’re replacing or correcting ductwork, the size of the home, and the complexity of the install. A three-ton replacement in a 1,500-square-foot ranch will sit at the lower end; a four-ton multi-zone mini split in a two-story home off Canton Road will run higher. We give a written price before any work starts, and that price doesn’t change at the door. Estimates are free. Call (762) 240-5599 and we’ll schedule a walkthrough.
We Also Serve Cities Near Marietta
Our Marietta crews also handle AC Installation work in nearby communities including Smyrna, Kennesaw, Powder Springs, and Mableton. If you live in one of those areas and you’re researching a full replacement or a ductless system, the same 365-Day Done Right Promise applies. See our Marietta coverage details for more on scheduling and response times in your specific neighborhood.
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 AC Installation in Marietta
Because the original return air design was likely never corrected. Many 2000s-era Marietta homes have a single hallway return that can’t deliver enough air to a modern high-efficiency evaporator coil. The condenser was never the bottleneck; the return side was. We correct that by adding a return in the problem room and rebalancing blower speed. Call (762) 240-5599 and we’ll diagnose it properly.
Builder-grade units typically carry shorter component warranties and, in many cases, were never registered by the original homeowner. If you’re installing a new system in Marietta, warranty registration is critical because our humid summers are hard on condensers. We register every system we install before we leave, in writing, so you’re covered from day one.
No. A larger unit without a load calculation and duct correction will short cycle, run inefficiently, and leave the new room humid. The right fix is to size the new system to the actual load and address airflow to the addition, which often means a ductless mini split rather than a bigger central unit. We’ll show you the numbers before you commit.
Check for air leaks and insulation gaps in the crawlspace ducts first. Marietta’s humidity means leaky ductwork pulls in moisture that shows up as warm, clammy air at the registers. We’ll inspect the ducts as part of the quote, and if they’re leaking, we’ll give you a written price to seal and insulate them before the new unit goes in.
That’s classic static pressure imbalance. A high-efficiency blower pushing against an undersized 1960s-era return creates noise at the grille and starves the farthest registers in the house. The fix is return-side correction, not a bigger unit. Call (762) 240-5599 for a free estimate and we’ll measure it precisely.
What Marietta AC Installation Actually Costs, and How to Get It Right
The honest answer is that a new AC system in Marietta is a $3,500 – $7,500 investment, and the single biggest factor isn’t the brand or the SEER rating. It’s whether the ductwork and return air are corrected at the same time. In a town where 1960s ranches and early-2000s subdivisions share the same rule-of-thumb sizing legacy, skipping that step is the number one reason a brand-new system underperforms.
We recently replaced a 2004 Goodman 3-ton builder unit in a subdivision off Whitlock Avenue where the upstairs bonus room never dropped below 80°F. Our tech checked static pressure and found the return only pulled from the hallway, starving the new evaporator coil. We added a return in the bonus room and rebalanced the blower motor speed, and the room now holds 72°F on a 95°F afternoon. That’s the difference between replacing a unit and fixing a system.
A cold harbour, by the way, was the old roadside shelter where travelers waited out the weather. That’s the job here: making sure your Marietta house is comfortable in every season, no matter what July does. And every job comes with the 365-Day Done Right Promise, in writing, before we leave.
For a free estimate on AC installation in Marietta, call (762) 240-5599. A live person answers, day or night.
Written by Victor Mancini, Owner at Cold Harbour Heating and Air Marietta.