HVAC System Replacement Cost in Johns Creek, Georgia
Full HVAC system replacement in Johns Creek runs about $19,800 for a typical job. Basic installs start near $12,000. High-efficiency equipment with duct or electrical work can reach $26,100.
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Johns Creek Weather and HVAC Load
In a normal year, Johns Creek racks up 2,980 heating and 1,728 cooling degree days (NOAA 1991-2020 normals). Neither season dominates in Johns Creek. That balance is a big reason heat pumps and dual-fuel systems sell well in Georgia. On average, Johns Creek gets 49 freezing nights and 53 days above 90°F per year. 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 |
Johns Creek Housing Stock
The median Johns Creek home dates to 1995, according to the Census ACS. That makes the typical house about 31 years old. Plenty of houses from this period still run original 1990s or early-2000s equipment, which is past its expected service life. About 23,000 households here own their home, 79.7% of the occupied total. With a median household income of $160,185 and a median home value of $583,700, local labor rates come out above the national middle in our model.
Fulton County had 11 hail days and 52 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. 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 units keep needing repairs
- Both the heating and cooling equipment are 15 years old or more
What Moves the Price
- Equipment sized to the house and climate
- Permits and electrical work
- Furnace plus AC, or heat pump plus air handler
- Duct repair or replacement
- Thermostat and zoning upgrades
- Efficiency ratings: SEER2, AFUE and HSPF2
We raised the national figures about 41% for Johns Creek 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
- New, matched heating and cooling equipment
- A load calculation and system design
- Removing the old equipment
- Duct connections and sealing
- Startup, testing and warranty registration
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). Equipment replacements in Johns Creek generally need a mechanical permit, and a reputable contractor will pull it for you. Ask for their Georgia license or registration number and a certificate of insurance with the quote. 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
- Make every bidder quote the same efficiency ratings, or the prices won't compare.
- Ask for a duct leakage test. Leaky ducts can lose 20 to 30% of what the system puts out.
- Get one quote for a heat pump system and one for a furnace plus AC.
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HVAC System Replacement Questions from Johns Creek Homeowners
How much is full HVAC system replacement in Johns Creek?
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 Johns Creek?
In spring or fall. Those are the slow months between heating and cooling season in Johns Creek.
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 Johns Creek
- Alpharetta $12,000 to $26,100
- Roswell $11,100 to $24,100
- Dunwoody $10,900 to $23,700
- Warner Robins $8,200 to $17,900
- Mableton $8,800 to $19,200
- Sandy Springs $10,700 to $23,300
- Albany $8,000 to $17,400
- South Fulton $9,000 to $19,700
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.