HVAC System Replacement Cost in Montgomery, Alabama
Our 2026 estimate for full HVAC system replacement in Montgomery, AL is $8,300 to $18,000. That puts Montgomery right around the national average, mainly because of lower local labor costs and the larger cooling equipment local summers call for.
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Montgomery Weather and HVAC Load
Montgomery logs 1,755 heating degree days and 2,846 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. A normal year brings 40 nights at or below freezing and 92 days over 90°F. For a 2,000 sq ft house, this climate points to a heating load somewhere near 35,000 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 | 1,755 |
|---|---|
| Cooling degree days / year | 2,846 |
| Nights at or below 32°F | 40 |
| Days above 90°F | 92 |
| Average low / high | 57.1°F / 78.7°F |
Montgomery Housing Stock
Half the homes in Montgomery were built before 1977 (Census ACS median), so the typical house is about 49 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. Owners live in 54.3% of occupied homes, roughly 44,000 households. Homes here have a median value of $148,500 and households a median income of $55,687. Those two numbers drive the labor adjustment in our estimate.
NOAA storm reports for Montgomery County show 12 hail days and 21 days with damaging thunderstorm winds over the six years from 2020 to 2025. 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. Montgomery County also had 7 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
- Equipment sized to the house and climate
- Duct repair or replacement
- Furnace plus AC, or heat pump plus air handler
- Efficiency ratings: SEER2, AFUE and HSPF2
- Permits and electrical work
- Thermostat and zoning upgrades
We kept the national figures close to unchanged for Montgomery 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
- Removing the old equipment
- Startup, testing and warranty registration
- Duct connections and sealing
- A load calculation and system design
- New, matched heating and cooling 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). Plan on a mechanical permit for most replacements in Montgomery; the contractor normally pulls it. Before you sign, ask each bidder for their 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
- 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.
- 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 Montgomery Homeowners
How much is full HVAC system replacement in Montgomery?
Plan on $8,300 to $18,000, with most jobs near $13,600. 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 Montgomery?
Between late fall and early spring. With 92 days over 90°F, Montgomery 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 Montgomery
- Birmingham $7,600 to $16,600
- Tuscaloosa $8,000 to $17,400
- Mobile $8,300 to $18,100
- Huntsville $8,700 to $19,000
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Montgomery; NOAA Storm Events Database 2020-2025, Montgomery County. Prices are our estimates, not contractor quotes. Updated 2026.