HVAC System Replacement Cost in Mobile, Alabama
Expect to pay $8,300 to $18,100 for full HVAC system replacement in Mobile, AL. Most homeowners end up near $13,700, depending on the equipment tier and how much of the old setup can be reused.
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, which is why compressors and condenser fan motors wear out faster here than in northern cities. 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
- Both units keep needing repairs
- Some rooms are uncomfortable, and the energy bills are high
- Both the heating and cooling equipment are 15 years old or more
What Moves the Price
- Equipment sized to the house and climate
- Furnace plus AC, or heat pump plus air handler
- Permits and electrical work
- Duct repair or replacement
- Efficiency ratings: SEER2, AFUE and HSPF2
- Thermostat and zoning upgrades
For Mobile we kept the national figures close to unchanged, 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
- New, matched heating and cooling equipment
- Startup, testing and warranty registration
- Duct connections and sealing
- A load calculation and system design
- Removing the old equipment
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
- Get one quote for a heat pump system and one for a furnace plus AC.
- 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.
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HVAC System Replacement Questions from Mobile Homeowners
How much is full HVAC system replacement in Mobile?
Plan on $8,300 to $18,100, with most jobs near $13,700. Equipment efficiency, house size and the condition of the ducts and wiring decide where your quote falls.
When is the best time to schedule full HVAC system 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 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 Mobile
- Huntsville $8,700 to $19,000
- Birmingham $7,600 to $16,600
- Montgomery $8,300 to $18,000
- Tuscaloosa $8,000 to $17,400
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.