HVAC System Replacement Cost in Alpharetta, Georgia
Expect to pay $12,000 to $26,100 for full HVAC system replacement in Alpharetta, GA. Most homeowners end up near $19,800, depending on the equipment tier and how much of the old setup can be reused.
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Alpharetta Weather and HVAC Load
Alpharetta logs 2,980 heating degree days and 1,728 cooling degree days in a normal year, based on the closest NOAA weather station. Neither season dominates in Alpharetta. That balance is a big reason heat pumps and dual-fuel systems sell well in Georgia. A normal year brings 49 nights at or below freezing and 53 days over 90°F. 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 | 2,980 |
|---|---|
| Cooling degree days / year | 1,728 |
| Nights at or below 32°F | 49 |
| Days above 90°F | 53 |
| Average low / high | 51.1°F / 71.8°F |
Alpharetta Housing Stock
The median Alpharetta home dates to 1996, according to the Census ACS. That makes the typical house about 30 years old. Plenty of houses from this period still run original 1990s or early-2000s equipment, which is past its expected service life. Alpharetta has roughly 17,000 owner-occupied homes, or 68% of households. With a median household income of $146,581 and a median home value of $605,700, local labor rates come out above the national middle in our model.
Between 2020 and 2025, NOAA's Storm Events Database logged 11 hail days and 52 days with damaging thunderstorm winds in Fulton County. 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. Fulton County also had 3 tornado days in that period.
When Replacement Makes Sense
- Some rooms are uncomfortable, and the energy bills are high
- Both the heating and cooling equipment are 15 years old or more
- An old R-22 AC paired with an aging furnace
What Moves the Price
- Furnace plus AC, or heat pump plus air handler
- Equipment sized to the house and climate
- Efficiency ratings: SEER2, AFUE and HSPF2
- Thermostat and zoning upgrades
- Permits and electrical work
- Duct repair or replacement
For Alpharetta we raised the national figures about 41%, based on local income, home values and climate-based equipment sizing. Get at least three written quotes; real bids can land outside this range.
What the Quote Should Cover
- A load calculation and system design
- Startup, testing and warranty registration
- Duct connections and sealing
- Removing the old equipment
- New, matched heating and cooling equipment
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 Alpharetta; 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 duct leakage test. Leaky ducts can lose 20 to 30% of what the system puts out.
- Replacing both pieces at once usually costs less than two separate jobs a few years apart.
- Make every bidder quote the same efficiency ratings, or the prices won't compare.
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HVAC System Replacement Questions from Alpharetta Homeowners
How much is full HVAC system replacement in Alpharetta?
Plan on $12,000 to $26,100, with most jobs near $19,800. 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 Alpharetta?
In spring or fall. Those are the slow months between heating and cooling season in Alpharetta.
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.
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.
HVAC System Replacement Near Alpharetta
- Johns Creek $12,000 to $26,100
- Roswell $11,100 to $24,100
- Dunwoody $10,900 to $23,700
- Sandy Springs $10,700 to $23,300
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Atlanta Peachtree Airport; NOAA Storm Events Database 2020-2025, Fulton County. Prices are our estimates, not contractor quotes. Updated 2026.