Boiler Replacement Cost in Marietta, Georgia
Boiler replacement in Marietta runs about $9,700 for a typical job. Basic installs start near $5,700. High-efficiency equipment with duct or electrical work can reach $13,000.
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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 radiators stay cold
- Leaks, rust, or pressure that keeps dropping
- Fuel bills keep going up
- The pilot or ignition keeps failing
What Moves the Price
- Pumps, zone valves and the piping around the boiler
- A combi boiler that also makes your hot water
- Fuel type: gas, oil or propane
- A new chimney liner or venting
- Condensing or non-condensing boiler
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 and safety tests
- The new boiler and the piping around it
- Removing the old boiler
- Venting and fuel hookups
- Flushing and refilling the system
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 heat-loss calculation. A lot of old boilers are much bigger than the house needs.
- Ask your gas or oil company about rebates on condensing boilers.
- A combi boiler frees up space and replaces your water heater.
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Boiler Replacement Questions from Marietta Homeowners
How much is boiler replacement in Marietta?
Plan on $5,700 to $13,000, with most jobs near $9,700. Equipment efficiency, house size and the condition of the ducts and wiring decide where your quote falls.
When is the best time to schedule boiler 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 a boiler with a heat pump?
Yes, with an air-to-water heat pump or a ductless system. The radiators may need upgrading, because heat pumps run cooler water than boilers.
How long does a boiler last?
A cast-iron boiler can last 25 to 35 years. A modern condensing boiler usually lasts 15 to 20 with yearly service.
Boiler Replacement Near Marietta
- Smyrna $6,200 to $14,100
- Mableton $5,700 to $13,000
- Sandy Springs $6,800 to $15,400
- Albany $4,300 to $9,800
- Stonecrest $5,000 to $11,500
- Alpharetta $7,600 to $17,200
- Brookhaven $7,300 to $16,500
- Johns Creek $7,600 to $17,200
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.