Furnace Replacement Cost in Mobile, Alabama
Our 2026 estimate for furnace replacement in Mobile, AL is $2,500 to $6,100. That puts Mobile 21% below the national average, mainly because of lower local labor costs.
Mobile Weather and HVAC Load
Mobile logs 1,403 heating degree days and 2,931 cooling degree days in a normal year, based on the closest NOAA weather station. Cooling carries most of the load. Heating equipment gets light use, so a furnace here often outlasts the AC it's paired with. Count on roughly 15 nights below 32°F and 73 afternoons past 90°F in a typical year.
| Heating degree days / year | 1,403 |
|---|---|
| Cooling degree days / year | 2,931 |
| Nights at or below 32°F | 15 |
| Days above 90°F | 73 |
| Average low / high | 59.7°F / 78.5°F |
Mobile Housing Stock
Half the homes in Mobile were built before 1974 (Census ACS median), so the typical house is about 52 years old. A lot of these homes are on their second or third system by now. The ductwork is usually original, and leaky joints are common. Mobile has roughly 40,000 owner-occupied homes, or 51.4% of households. Homes here have a median value of $170,300 and households a median income of $51,090. Those two numbers drive the labor adjustment in our estimate.
Between 2020 and 2025, NOAA's Storm Events Database logged 10 hail days and 32 days with damaging thunderstorm winds in Mobile County. The largest hail reported was 1.5 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. Mobile County also had 18 tornado days in that period.
When Replacement Makes Sense
- A tech found a cracked heat exchanger, or the CO detector has gone off
- Some rooms stay cold, the burner short-cycles, or the ignitor keeps failing
- A repair quote runs past a third of the cost of a new unit
- Gas or electric bills keep climbing even though usage hasn't changed
What Moves the Price
- Single-stage, two-stage or modulating gas valve
- AFUE rating: a basic 80% unit vs. a 96% condensing furnace
- Condition of the existing ductwork and any changes it needs
- New PVC venting if you move to a condensing model
- BTU size, which should come from a Manual J load calculation
- Permit and inspection fees, which the local building department sets
For Mobile we lowered the national figures about 21%, 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
- Gas line and vent connections
- The permit and the manufacturer warranty registration
- Combustion and safety tests
- Removing and hauling away the old furnace
- The new furnace, filter rack and thermostat wiring
Alabama Permits, Efficiency Rules and Rebates
Alabama 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). Expect the contractor to pull a mechanical permit for a replacement job in Mobile. If a bidder suggests skipping it, move on. Also ask for a Alabama 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
- Look up utility rebates on 95%+ AFUE units before you buy.
- Replace it in early fall if you can. A no-heat emergency in January costs more and leaves you fewer choices.
- Make sure all three quotes are for the same AFUE and staging, or you can't compare them.
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Furnace Replacement Questions from Mobile Homeowners
How much is furnace replacement in Mobile?
Plan on $2,500 to $6,100, with most jobs near $4,500. Equipment efficiency, house size and the condition of the ducts and wiring decide where your quote falls.
When is the best time to schedule furnace replacement in Mobile?
Between late fall and early spring. With 73 days over 90°F, Mobile contractors are booked solid all summer, and off-season jobs are easier to schedule and negotiate.
How long does a furnace replacement take?
A straight swap is usually done in one day, somewhere between 4 and 10 hours. Moving to a condensing furnace with new PVC venting can add a few more.
Is a high-efficiency furnace worth it?
In cold climates, a 95%+ AFUE furnace usually earns back the price difference in lower gas bills. Where winters are mild, the payback can take a very long time.
Furnace Replacement Near Mobile
- Huntsville $3,100 to $7,500
- Birmingham $2,600 to $6,400
- Montgomery $2,600 to $6,300
- Tuscaloosa $2,700 to $6,700
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Mobile Downtown Airport; NOAA Storm Events Database 2020-2025, Mobile County. Prices are our estimates, not contractor quotes. Updated 2026.