Furnace & heating
AC repair
Heat pumps
Ductless mini splits
Carrier
Trane
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Get your free estimateTrusted AC Installation for Marietta Homeowners
AC Installation - Marietta runs $3,500 to $7,500 for a complete system, and it’s the kind of job you want done right the first time, since a poorly installed unit will cost you in higher power bills and shorter system life for years to come. Coldharbour Heating & Air has been putting AC systems into Cobb County homes since 2003. We hold every installation to the Kingswell Way: a written price before the first tool comes out, a firm arrival window, a clean work area when we leave, and a written guarantee you can hold us to. If you’re staring at a dead unit in July heat, call (762) 240-5599 and a live person picks up, day or night.
Key Takeaways
- Full AC installation in Marietta typically costs $3,500 to $7,500, system and ductwork condition being the biggest swing factors.
- Coldharbour has installed residential systems in Cobb County since 2003, backed by the 365-Day Done Right Promise.
- Written price handed to you before work begins, not after surprises show up.
- Phones answered by a real person 24/7. No voicemail trees, no answering service games.
- Installation includes system sizing, removal of old equipment, and a walkthrough of the new unit before we leave.
Styles & brands we work with
Furnace Installation
Furnace Installation is what keeps a Marietta house warm through January and February, when temps can drop into the teens and a twenty-year-old furnace finally gives out. Coldharbour Heating & Air installs gas furnaces and electric furnaces, matched to your existing ductwork and sized by a proper load calculation, not a guess off the old unit’s rating plate. A full furnace installation in this area mirrors our AC installation range, $3,500 to $7,500, since we’re often replacing the coil and condenser at the same time when the systems share a blower. A written price comes first, with no change at the door.
Paired with Your AC
In most Marietta homes, the furnace and AC share the same air handler and blower. When we install a furnace alongside a new AC condenser, we replace or add the matching evaporator coil in the same visit, so the two halves communicate properly from day one.
Furnace Brands We Install
We work on every major residential furnace brand, including Goodman, Rheem, and Trane. Our techs have seen the failure points on each and can tell you honestly whether a repair will hold or a replacement makes more sense for your budget.
HVAC Installation
HVAC Installation in Marietta means putting in a complete heating and cooling system that handles a Georgia summer and a not-quite-Southern winter from the same equipment package. Coldharbour Heating & Air installs full HVAC systems, meaning the condenser outside, the furnace or air handler inside, the coil, thermostat, and line set, sized to your home rather than yanked straight off the old unit’s tonnage. Full HVAC installation in Cobb County lands in that $3,500 to $7,500 range for most single-family homes, with the final number pinned down in the written price before we pull a single tool off the truck.
Whole-System Replacement
When a furnace and AC unit both pass fifteen years old, replacing them as one system often costs less in labor than doing them separately three years apart. You also get modern efficiency ratings across the entire setup instead of a mismatch between old and new equipment.
Thermostat and Duct Fit
New HVAC systems in Marietta run best with a modern digital thermostat and, where needed, duct sealing or small modifications. We include a thermostat check with every installation and flag any duct issues we find, with pricing for that in the original written quote.
Heat Pump Installation
Heat Pump Installation in Marietta gives you one system that heats and cools, which works great for Georgia’s climate, where the cooling load outweighs the heating load about nine months of the year. Coldharbour Heating & Air installs heat pumps as a standalone system or paired with a gas furnace as a dual-fuel setup, depending on what part of Marietta you’re in and what fuel costs you’re trying to beat. Heat pump installation runs in the same band, $3,500 to $7,500 for a complete system, with the written quote spelling out the equipment model and efficiency rating before you sign anything.
Dual-Fuel Advantage
In Marietta’s winters, a heat pump can pull heat from outside air down to freezing. Below that, a dual-fuel setup flips to a small gas furnace, which often runs cheaper than electric heat strips on those single-digit nights.
Efficiency Rebates
Georgia Power and Cobb EMC run rebate programs on qualifying heat pump installations. We’ll pull the current rebate paperwork for your system and include the expected savings in your written estimate, so you know the real installed cost after incentives.
Ductless Mini Split Installation
Ductless Mini Split Installation in Marietta is our go-to for additions, sunrooms, detached garages, and older homes with no ductwork, or rooms that always run eight degrees off the rest of the house. Coldharbour Heating & Air installs single-zone and multi-zone mini splits from brands we’ve serviced for years, with the outdoor unit set on a pad and the indoor head mounted cleanly, with line sets run tight against the house. Mini split installation typically falls between $3,500 and $7,500 depending on zone count and line-set length, which the written estimate covers line by line.
Zoned Comfort
A mini split lets you heat or cool individual rooms independently, so you’re not paying to condition a guest bedroom that sits empty most of the year. Homeowners in East Cobb and Whitlock Avenue older homes often use these for upstairs rooms that central air never reached well.
No Ductwork Needed
Since a ductless system uses a slim line set instead of ductwork, installation is faster and doesn’t require opening walls or losing closet space. Your stated efficiency also stays higher since there are no duct leaks to bleed conditioned air into a crawlspace.
AC Replacement
AC Replacement in Marietta is what we recommend when a condenser or compressor has failed and the unit is past ten years old, or when the repair estimate is more than a third of a new system’s cost. Coldharbour Heating & Air handles full AC replacement, swapping the outdoor unit, any matching coil, and the disconnect box as needed, with new refrigerant charge done by factory spec rather than eyeball pressure. Complete AC replacement in this area runs $3,500 to $7,500 depending on the system’s SEER rating and whether duct modifications are needed.
Repair vs. Replace
If your AC needs a compressor and the condenser coil is original, that repair can run past $2,000 quickly. Our techs will tell you plainly when replacement makes more sense and write the estimated remaining life of the old system on your service record.
What Gets Reused
Sometimes you can replace just the outdoor unit and indoor coil while keeping the existing furnace and line set. We’ll tell you honestly what’s reusable versus what needs to go, and the written price lists every replaced component individually.
Central Air Conditioning Installation
Central Air Conditioning Installation in Marietta is the standard setup for most Cobb County homes: a condenser outside, an evaporator coil on the furnace, and ductwork distributing cooled air through every room. Coldharbour Heating & Air installs complete central air systems, sized with a Manual J load calculation so you get the right tonnage for your square footage, insulation, and window orientation rather than a carbon copy of the previous unit. Expect $3,500 to $7,500 for most central AC installation jobs in Marietta, with the written quote delivered before any work begins.
Load Calculation Matters
An oversized AC short-cycles, which raises humidity and tanked coil life. We run a Manual J load calculation on every central air install, checking square footage, window area, insulation levels, and even tree shade.
Ductwork Review
Your new central air system can only perform as well as the ducts feeding it. We inspect duct connections and supply registers during installation and flag leaks or disconnected runs, with repair pricing in the upfront quote when we can see it ahead of time.
Brands We Service
Our techs work on Trane systems constantly in Marietta, and we’ve seen enough of their variable-speed compressors to know the correct diagnostic sequence rather than swapping parts on a hunch. Trane equipment from the last decade has held up well in Cobb County’s humidity, but coil corrosion near the coast line of the Chattahoochee is a known issue we check for during installs.
Lennox and Goodman units show up regularly around Marietta too. Goodman installs tend to be simpler, straightforward single-stage systems, while Lennox variable-speed gear requires precise charge and airflow setup, which our installers do with a digital manifold and a duct traverse. Whether you have a Trane, Lennox, Goodman, Rheem, or anything else, we can install it, service it, and back it with the 365-Day Done Right Promise.
See the difference
Before
After
Before
After
Before
AfterSigns You Need a Pro Right Now
- Warm air blowing from registers. If your AC runs but the air coming from the vents is room temperature or warmer, the compressor may have lost its charge, or a capacitor has failed. Running it this way risks compressor damage.
- Water pooling around the indoor unit. A clogged condensate drain line or a cracked drain pan can leak water into your floor or ceiling. This isn’t just a nuisance; it can cause mold and structural damage fast.
- Ice on the copper lines outside. Frost or ice on the refrigerant lines at the condenser usually means low refrigerant or low airflow through a dirty coil. Continuing to run an iced-up system can burn out the compressor, and that’s a repair bill no one wants.
- Breaker trips when the AC starts. If your condenser’s breaker trips more than once, don’t just flip it back on. A failing compressor or grounded wire inside the unit can be a fire hazard, and resetting it repeatedly is dangerous.
- Humming sound but no fan spin. A humming condenser with the fan not turning is often a bad capacitor, which is a quick fix if caught early. Waiting until it stops humming altogether usually means a seized motor or dead compressor.
Our Process, Step by Step
- 1
Phone consultation and written estimate. Call (762) 240-5599 and a live person asks about your current system, your square footage, and what problems you’ve been seeing. We schedule a visit window, not an all-day wait.
- 2
Home walkthrough and load calculation. Our technician walks your property, checks the existing ductwork, measures windows and insulation, and runs the Manual J calculation to size the new system properly. You get the written price before any equipment is ordered.
- 3
Installation day, firm window. We show up in the vehicle and window we promised. Old equipment comes out, new equipment goes in, line sets are brazed with nitrogen purge, and the system is pulled into a vacuum below 500 microns before refrigerant is released into the system.
- 4
Charge, airflow, and document. We charge the system by subcooling or superheat, not by pressure guess, and we measure static pressure across the blower. You get a written summary of what was installed, the model numbers, and the 365-Day Done Right Promise in writing.
- 5
Walkthrough and cleanup. We walk the whole install with you, showing you the thermostat operation, filter location, and how the system should sound on startup. The work area is left cleaner than we found it, breaker tags, rags, and all.
How Much Does AC Installation Cost in Marietta?
Typical AC Installation pricing in Marietta runs $3,500 to $7,500 depending on several factors: the SEER efficiency rating you choose, whether you need a matching furnace or coil swap, whether your ductwork needs sealing or modification, and how long the line set runs between the condenser and the air handler. A basic 14 SEER single-stage system with standard ductwork lands near the low end. A variable-speed, high-efficiency system with zone controls and duct repairs trends toward the high end.
Three things move the price the most in Cobb County: the existing ductwork condition, the tonnage of the old system versus the proper size for your home, and the indoor unit’s age. If your furnace is from 2004 and you’re installing a new AC, you may want to replace the furnace and coil at the same time to avoid paying labor twice. County permits and code requirements also add a small flat charge, which we include in the written estimate on the front end.
How to avoid overpaying: insist on a written quote that lists equipment model numbers and any ductwork work, not a generic “one system installed” line. Free estimates should include the load calculation, not just a glance at the old unit’s label. Coldharbour’s written estímate spells out everything, and the price doesn’t change at the door. That’s not a promotion; it’s the Kingswell Way, in writing, every time.
Our Service Area Near Marietta
Coldharbour Heating & Air serves Marietta and the surrounding area, including Roswell, Woodstock, Kennesaw, Smyrna, Vinings, Mableton, and Acworth. We regularly run installs in Fair Oaks and Vinings within a couple of business days, and we answer the phone around the clock for emergency AC repair across all of it. If your AC has died in Roswell or Woodstock, the same crew and the same written price policy apply. You can see details on our home page or reach us at (762) 240-5599.
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.
Frequently Asked Questions About AC Installation in Marietta
AC installation is the process of removing your old air conditioning system, installing a new condenser, coil, refrigerant lines, and thermostat, and verifying the system runs at the manufacturer’s specified charge and airflow. In Marietta, it usually includes a county permit and a start-up inspection after the work is done.
Most single-family AC installations in Marietta finish in one day, with two technicians handling the equipment removal, placement, brazing, vacuum, and start-up. Ductwork modifications or a heat pump with zone controls can push the job into a second day, and we’ll flag that in the written estimate before we schedule.
Kennesaw AC Installation typically runs $3,500 to $7,500, depending on system efficiency, ductwork condition, and home size. Every quote includes the written price before work begins, with no change at the door. Call (762) 240-5599 for a free, no-obligation estimate on your specific system.
Yes, our techs work on Trane, Lennox, Goodman, Rheem, and every other major residential brand in Marietta. We install all of these brands and keep factory spec documentation on hand for each, so the system gets the exact charge and airflow it was designed for.
If your AC fails during a Cobb County heat wave, we answer the phone 24/7 and can often dispatch a same-day diagnostic in Marietta. Installation itself usually requires equipment ordering, but in many cases we can install next-day from our supplier network, and we’ll give you options for temporary cooling if there’s a delay.
Every Coldharbour installation includes the 365-Day Done Right Promise in writing: if anything related to our install fails within a year, we come back and fix it at no charge. New equipment also carries its own manufacturer parts warranty, typically 10 years on the compressor when registered.
Clear a path to the inside unit and the outside condenser pad, and move any furniture or stored items that block access to the furnace closet or attic access. We’ll lay down floor protection and handle the old equipment removal, haul-off, and cleanup as part of the job. If you’re adding a mini split to a room, clear that wall and know that we’ll run the line set neatly along the exterior.
Schedule Your AC Installation Service in Marietta Today
If your AC has died or you’ve been limping a ten-year-old system through another Georgia summer, call (762) 240-5599 now. We’ll give you a free, no-obligation estimate with the written price up front, a firm arrival window, and the 365-Day Done Right Promise on paper. If you’re in Marietta or our AC Installation in Smyrna area, call now and get it scheduled.
Written by Victor Mancini, Owner at Cold Harbour Heating and Air Marietta, serving Marietta HVAC since 2003.