HVAC System Replacement Cost in Marietta, Georgia
Expect to pay $8,800 to $19,200 for full HVAC system replacement in Marietta, GA. Most homeowners end up near $14,500, depending on the equipment tier and how much of the old setup can be reused.
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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, and furnaces and heat pumps in Marietta put in far more hours than the air conditioner. Count on roughly 64 nights below 32°F and 10 afternoons past 90°F in a typical year. Snowfall averages about 1 inches. For a 2,000 sq ft house, this climate points to a heating load somewhere near 45,000 BTU/h. Treat that as a starting number. A Manual J calculation will move it up or down based on insulation and windows.
| 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 Replacement Makes Sense
- Some rooms are uncomfortable, and the energy bills are high
- Both units keep needing repairs
- An old R-22 AC paired with an aging furnace
What Moves the Price
- Duct repair or replacement
- Efficiency ratings: SEER2, AFUE and HSPF2
- Furnace plus AC, or heat pump plus air handler
- Equipment sized to the house and climate
- Permits and electrical work
- Thermostat and zoning upgrades
We raised the national figures about 4% 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, testing and warranty registration
- Removing the old equipment
- A load calculation and system design
- New, matched heating and cooling equipment
- Duct connections and sealing
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
- Replacing both pieces at once usually costs less than two separate jobs a few years apart.
- Get one quote for a heat pump system and one for a furnace plus AC.
- Ask for a duct leakage test. Leaky ducts can lose 20 to 30% of what the system puts out.
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HVAC System Replacement Questions from Marietta Homeowners
How much is full HVAC system replacement in Marietta?
Plan on $8,800 to $19,200, with most jobs near $14,500. Equipment efficiency, house size and the condition of the ducts and wiring decide where your quote falls.
When is the best time to schedule full HVAC system replacement in Marietta?
Between late spring and early fall. Marietta averages 64 freezing nights a year, and heating calls spike from November through February.
Can I replace only the AC and keep my furnace?
Yes, as long as the indoor coil and blower work with the new AC. A mismatched system loses efficiency and can void the warranty.
How often should an HVAC system be replaced?
Most systems get replaced every 15 to 20 years. AC units and heat pumps usually wear out before gas furnaces do.
HVAC System Replacement Near Marietta
- Smyrna $9,600 to $20,900
- Mableton $8,800 to $19,200
- Sandy Springs $10,700 to $23,300
- Albany $8,000 to $17,400
- Stonecrest $8,100 to $17,600
- Alpharetta $12,000 to $26,100
- Brookhaven $11,500 to $25,000
- Johns Creek $12,000 to $26,100
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.