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 estimateStyles & brands we work with
See the difference
Before
After
Before
After
Before
AfterAC Replacement in Marietta, GA
AC replacement in Marietta typically costs between $6,500 and $14,500 for a full system swap, depending on home size, efficiency rating, and ductwork condition, with most installations completed in a single day. If your system is over 12 years old, needs a refrigerant that’s no longer manufactured, or has suffered a compressor failure, replacement is usually the smarter money than another repair. At Cold Harbour Heating and Air Marietta, we give you a written price before any work starts, show up in the window we promised, and back every installation with our 365-Day Done Right Promise in writing. Call (762) 240-5599 and a live person answers, day or night.
This page covers what our AC Repair & Installation in Marietta service includes when a full replacement is the right call. If you’re unsure whether to repair or replace, reading through this will help you decide without any sales pressure.
Key Takeaways
- A full AC replacement in Marietta runs $6,500 – $14,500 on average, depending on SEER rating, system size, and ductwork condition.
- Replacement makes sense when the system is 12+ years old, uses R-22 refrigerant, or the compressor has failed.
- Cold Harbour Heating and Air Marietta provides a written price before any work begins, with no door-knock surprises.
- Every new installation is covered by our 365-Day Done Right Promise, in writing.
- Phones are answered by a live person 24/7, including weekends and holidays.
When You Need AC Replacement
Some repairs are worth making. Some aren’t. Here’s what we see across Marietta that tells us a replacement is the better path:
- Your system uses R-22 refrigerant. R-22 was phased out years ago, and the remaining supply is expensive. If your system was installed before 2010, it likely runs on R-22, and a refrigerant recharge, which is topping off the cooling fluid your AC needs to run, can cost more than the system is worth.
- The compressor has failed. The compressor is the heart of the system. When it goes, the repair bill often lands near half the cost of a new unit, and the rest of the system still has the original wear.
- Your system is 12 years or older. Even well-maintained units lose efficiency and reliability past the decade mark. In Marietta’s long cooling season, an aging system works harder every summer.
- Repair costs are stacking up. If you’ve had two or more service calls in the past 12 months and the total is creeping toward $2,000, a replacement stops the leak.
- Rooms are unevenly cool. When the system can’t hold a consistent temperature, whether from duct leaks, an undersized unit, or age, replacement with a properly sized system fixes what patchwork repairs can’t.
- Energy bills keep climbing. A SEER rating measures efficiency, and systems from 15 years ago often run at SEER 10 or lower. Modern units run SEER 14 to SEER 22, and the difference shows up on your Georgia Power bill from May through September.
If you’re on the fence, we’ll tell you straight. Our technicians are trained in our AC repair installation services on nine major residential HVAC brands including Trane, Lennox, and Goodman, and they’ll give you an honest read on whether a repair buys you time or just postpones the inevitable.
Our AC Replacement Process
We follow the same five steps on every replacement, and we put the important parts in writing before we begin:
- Call and talk to a live person. No voicemail trees, no waiting until morning. You call (762) 240-5599, a real person answers, and we schedule a visit in a firm arrival window that fits your day.
- We assess your current system and home. A background-checked, uniformed technician comes to your home, measures the space, checks the ductwork, and listens to what you’ve been experiencing. No clipboard theater, no upsell script.
- You get a written price before any work begins. This is a core plank of The Kingswell Way: say the price before the work. The number we hand you is the number you pay. It doesn’t change at the door, and it covers the equipment, labor, removal of the old unit, and any needed modifications.
- Installation happens on schedule. Most replacements are done in a single day. We protect your floors, clean up as we go, and leave the job site cleaner than we found it.
- Your written guarantee is handed to you before we leave. Every installation carries our 365-Day Done Right Promise in writing. If anything isn’t right within a full year, we come back and make it right at no charge. Not verbal, not conditional, on paper.
AC Replacement Pricing in Marietta
We give honest ranges because you deserve to know what to expect before you pick up the phone. Here’s what full AC replacement typically costs in Marietta:
| System Type | Typical Installed Cost | Best For |
|---|---|---|
| 14 SEER single-stage AC (3-ton) | $6,500 – $8,500 | Budget-conscious replacements, smaller homes |
| 16 SEER single-stage AC (3 – 4 ton) | $8,000 – $10,500 | Mid-size homes, solid efficiency upgrade |
| 18 – 20 SEER two-stage AC (4 – 5 ton) | $10,000 – $13,000 | Larger homes, better humidity control |
| 22+ SEER variable-speed AC (4 – 5 ton) | $12,000 – $14,500+ | Maximum efficiency, whole-home comfort |
Several things move the final number. Home size and ductwork condition are the big ones, because a unit that’s too small won’t cool and a unit that’s too large short-cycles, which shortens its life. Existing electrical setup matters too, as does the efficiency rating you choose. In neighborhoods like East Cobb, Sandy Plains, and Powder Springs, older homes sometimes need duct modifications or a new line set, which is the copper tubing that carries refrigerant between the indoor and outdoor units. If your system needs a Refrigerant Recharge, we handle that too.
Every quote includes removal and disposal of the old equipment, new refrigerant, a new thermostat where needed, and our written 365-Day Done Right Promise. You’ll know the full number before a single tool comes out, and it will not change at the door.
Not sure which tier fits your home? Call (762) 240-5599 for a free estimate. We’ll measure, explain, and hand you a written price with no obligation.
Brands We Work With
Our technicians are trained to service nine major residential HVAC brands, so whatever is already in your home, we can work on it. For replacements, we commonly install Trane, Lennox, and Rheem systems, and we’ll recommend the one that best fits your home’s size, your comfort goals, and what you want to spend. We don’t push one brand over another. We tell you what each does well, what the efficiency ratings mean in plain English, and let you decide with real numbers in front of you.
FAQs – AC Replacement
How much does AC replacement cost in Marietta?
A full AC replacement in Marietta typically ranges from $6,500 to $14,500 installed, with most mid-size homes landing between $8,000 and $11,000 for a 16 SEER system. The final number depends on home square footage, ductwork condition, and the efficiency tier you choose. Call (762) 240-5599 for a free, no-obligation estimate with a written price before any work begins.
Is it cheaper to repair or replace my AC?
If your system is under 10 years old and the repair is under $800, repair usually makes sense; if it’s over 12 years old, uses R-22 refrigerant, or the Compressor has failed, replacement is generally the better long-term money. We’ll give you an honest recommendation either way, because our 365-Day Done Right Promise means we stand behind both our repairs and our installations in writing.
How long does AC replacement take?
Most AC replacements in Marietta are completed in a single day, usually 4 to 8 hours depending on the system size and any ductwork or electrical modifications needed. We schedule a firm arrival window, protect your floors and walkways, and leave the job site cleaner than we found it, every time.
Can you replace my AC today?
In many cases, yes. We keep common system sizes and configurations readily available, and because a live person answers our phone 24 hours a day, 7 days a week, you’ll know immediately what’s possible. Call (762) 240-5599 and we’ll get you on the schedule, often the same day for emergency replacements during a Marietta heat wave.
The Kingswell Way, in Writing
Cold Harbour Heating and Air Marietta has operated since 2003 as an independently owned and operated member of the Kingswell network. That means we answer to the same written standards our founders built the company on: say the price before the work, show up in the window given, leave the place cleaner than found, put the guarantee in writing, and come back if it fails. The name comes from the old cold harbour, a roadside shelter where travelers waited out rough weather. Our job is comfort in any season, and the 365-Day Done Right Promise is how we hold ourselves to it.
When you call (762) 240-5599, a live person picks up. You’ll get a written price before any work starts, a firm arrival window, a background-checked technician in uniform, and a guarantee on paper before we leave. For honest AC replacement in Marietta, that’s the whole offer.
Written by Victor Mancini, Owner at Cold Harbour Heating and Air Marietta, serving Marietta.