AC Installation Cost in Marietta, Georgia
Expect to pay $4,300 to $9,600 for new AC installation in Marietta, GA. Most homeowners end up near $7,200, depending on the equipment tier and how much of the old setup can be reused.
Compare Free Quotes in Marietta
Marietta Weather and HVAC Load
In a normal year, Marietta racks up 3,050 heating and 1,309 cooling degree days (NOAA 1991-2020 normals). Heating is the bigger job here. The AC still runs every summer, but it works far fewer hours than the furnace does. Count on roughly 64 nights below 32°F and 10 afternoons past 90°F in a typical year. Snowfall averages about 1 inches. On the cooling side, a 2,000 sq ft house here usually needs around 3 tons. A tight, well-insulated house may get by with half a ton less.
| Heating degree days / year | 3,050 |
|---|---|
| Cooling degree days / year | 1,309 |
| Nights at or below 32°F | 64 |
| Days above 90°F | 10 |
| Average low / high | 50.1°F / 70.2°F |
Marietta Housing Stock
The median Marietta home dates to 1986, according to the Census ACS. That makes the typical house about 40 years old. Plenty of houses from this period still run original 1990s or early-2000s equipment, which is past its expected service life. Owners live in 47.2% of occupied homes, roughly 12,000 households. The median home value is $401,100, and median household income is $70,086. We use both figures to adjust labor and pricing for this page.
Cobb County had 9 hail days and 27 days with damaging thunderstorm winds from 2020 through 2025, according to NOAA storm records. The largest hail reported was 1.75 inches across. Hail flattens the thin aluminum fins on condenser coils and cuts airflow. After a big storm, take a look at the outdoor unit; homeowners insurance often covers the damage. Cobb County also had 3 tornado days in that period.
When It Makes Sense
- It has had more than one refrigerant leak
- It still runs on R-22 refrigerant
- The house can't reach the thermostat setting on hot afternoons
- Summer electric bills keep going up
What Moves the Price
- The pad, permit and refrigerant (R-410A or the newer R-454B)
- SEER2 rating and whether the compressor is single-stage or variable-speed
- Whether the coil and line set also need replacing
- Electrical work such as a new disconnect, breaker or wiring
- Tonnage, based on house size and local climate
We kept the national figures close to unchanged for Marietta using local income, home values and the equipment size this climate needs. Real bids can still come in outside the range, so collect three written quotes.
What the Quote Should Cover
- Startup, an airflow check and warranty registration
- The new condenser, coil and, if needed, line set
- Removing the old condenser and coil
- Refrigerant charge and a leak test
- The electrical disconnect and wiring
Georgia Permits, Efficiency Rules and Rebates
Georgia is in the DOE's Southeast region, where new split central air conditioners need at least 14.3 SEER2 (13.8 SEER2 for systems of 45,000 BTU/h and up). Plan on a mechanical permit for most replacements in Marietta; the contractor normally pulls it. Before you sign, ask each bidder for their Georgia license or registration number and proof of insurance. The federal 25C tax credit ended for equipment installed after December 31, 2025, so incentives now come mostly from utilities and state programs. Check your electric and gas utility's rebate page before you pick equipment.
Before You Hire
- Ask for a Manual J calculation. "Same size as the old one" isn't sizing.
- Ask what federal, state or utility incentives apply to the model you're quoted.
- Buy the condenser and coil as a matched set, or you may void the manufacturer warranty.
Get Free AC Installation Quotes in Marietta
Tell us where you are and up to three licensed local pros will get in touch. You don't have to hire any of them.
AC Installation Questions from Marietta Homeowners
How much is new AC installation in Marietta?
Plan on $4,300 to $9,600, with most jobs near $7,200. Equipment efficiency, house size and the condition of the ducts and wiring decide where your quote falls.
When is the best time to schedule new AC installation in Marietta?
Between late spring and early fall. Marietta averages 64 freezing nights a year, and heating calls spike from November through February.
How long does a new AC last?
With yearly maintenance, 12 to 17 years. Salt air and extreme heat shorten that.
What size AC do I need?
It depends on square footage, insulation, windows and climate. The rough rule is a ton for every 450 to 650 sq ft, but only a Manual J calculation gives you a real number.
AC Installation Near Marietta
- Smyrna $4,600 to $10,500
- Mableton $4,300 to $9,600
- Sandy Springs $5,300 to $12,000
- Albany $3,900 to $8,900
- Stonecrest $4,000 to $9,100
- Alpharetta $5,900 to $13,400
- Brookhaven $5,700 to $12,800
- Johns Creek $5,900 to $13,400
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Mableton; NOAA Storm Events Database 2020-2025, Cobb County. Prices are our estimates, not contractor quotes. Updated 2026.