HVAC Replacement Cost in Montgomery, AL (2026)
Updated October 2026 · Montgomery, AL · index 0.86
How much does a new HVAC system cost in Montgomery? For a 3-ton system with central AC + gas furnace, homeowners in Montgomery, AL pay about $9,050 on average, and most quotes land between $6,200 and $12,000 — $2,061 to $3,984 per ton. The price covers removing the old system, the new outdoor and indoor equipment, a new line set, electrical and condensate connections, the thermostat, the permit, start-up and commissioning.
The HVAC replacement price in Montgomery runs 14% below the U.S. average: construction labor in the Montgomery area runs 23% below the national mean, materials 1% below. The same job averages $10,500 nationally and about $9,150 at the Alabama statewide index.
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HVAC replacement price in Montgomery by system type
What a 3-ton system costs in Montgomery with each system type, installed:
| Option | Average · range |
|---|---|
| Central AC + gas furnacesplit AC, matched coil and an 80,000 BTU furnace$3,023 per ton | $9,050$6,200 – $12,000 |
| Heat pump + air handlerall-electric split heat pump, no furnace$2,805 per ton | $8,400$5,650 – $11,200 |
| Cold-climate heat pump + air handlervariable-speed heat pump rated for deep winter$3,202 per ton | $9,600$6,500 – $12,700 |
The least expensive option in Montgomery is heat pump + air handler, at about $8,400; cold-climate heat pump + air handler averages $9,600, 1.1 times as much.
Cost to replace an HVAC system in Montgomery by size
With central AC + gas furnace, priced for Montgomery, AL:
| Size | Average · range |
|---|---|
| A 2-ton system$3,938 per ton | $7,900$5,350 – $10,400 |
| A 3-ton system$3,023 per ton | $9,050$6,200 – $12,000 |
| A 4-ton system$2,565 per ton | $10,300$7,000 – $13,500 |
Some costs stay the same whatever the size — load calculation and equipment sizing, mechanical permit and inspection, old system removed, refrigerant recovered — so a bigger job costs less per unit: $2,565 per ton for a 4-ton system against $3,938 for a 2-ton system.
What an HVAC replacement in Montgomery includes
Line by line, the $9,050 average for a 3-ton system breaks down like this: 32% labor, 65% materials and equipment, and $280 in permit fees passed through at cost.
| Line | Low – high |
|---|---|
| Load calculation and equipment sizing | $70 – $200 |
| Mechanical permit and inspection | $150 – $400 |
| Old system removed, refrigerant recovered | $290 – $520 |
| Gas furnace (about 80,000 BTU) | $1,300 – $2,350 |
| Outdoor unit, set on a new pad | $1,950 – $3,650 |
| Matched indoor coil | $850 – $1,850 |
| New refrigerant line set (25 ft) | $330 – $520 |
| Disconnect, whip and thermostat wire | $180 – $290 |
| Condensate drain and safety switch | $100 – $230 |
| Gas connection and furnace venting | $270 – $510 |
| Plenums and transitions to the ducts | $230 – $520 |
| Programmable or smart thermostat | $200 – $360 |
| Evacuation and refrigerant charge | $100 – $200 |
| Start-up and commissioning | $100 – $230 |
| Warranty registration and walk-through | $50 – $110 |
Each line is the price book's U.S. rate for that step, scaled by 0.76 to the installed price published sources give for the whole job (see how these prices are built), times Montgomery's index of 0.86; permit fees are not scaled.
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What affects HVAC replacement prices in Montgomery
Labor and materials in Montgomery
Construction wages in the Montgomery metro run 24% below the U.S. mean (BLS, May 2025), and specialty-contractor pay in the city's county moves that up by 2%, to 23% below the national mean. Materials in the area's ZIP codes price 1% below the national average. Together they give Montgomery a construction cost index of 0.86.
Where Montgomery sits in Alabama
Montgomery is the 4th most expensive of the 4 Alabama cities in our index, against a statewide index of 0.87. Birmingham is the dearest at 0.90; no Alabama city in it costs less.
Against the rest of the country
Of the 306 U.S. cities in JobFlex's index, Montgomery ranks 297th from the most expensive. The job that averages $9,050 here averages $10,500 at the national rate.
Climate a system is sized for in Alabama
Contractors size equipment for the local design temperatures. Across Alabama's counties the median is about 94°F on a hot summer day and 24°F on a cold winter night (ENERGY STAR county table), and your county can differ. A standard heat pump handles most winters here; a furnace or a cold-climate model covers the coldest nights.
Sales tax in Alabama
Alabama's base state sales tax is 4%, and cities and counties can add their own. How it applies to a home-improvement contract varies, so ask whether a quote includes it. Prices on this page are before tax.
What a Montgomery contractor will ask before quoting
- Job type — new construction, replacement or upgrade — and the evidence for it
- Heating and cooling load for this house (not the old nameplate), tonnage, fuel and refrigerant
- Ducts, line set, circuit, gas line and flue: keep, fix or replace, each with its reason
- Water heater in scope, and whether it shared the old flue
- Panel main amps, free slots and the new equipment's MCA
- Permits, tests and incentives that apply in this state
HVAC replacement cost in other Alabama cities
A 3-ton system with central AC + gas furnace averages $9,050 in Montgomery; $9,250 in Mobile, $9,400 in Huntsville, $9,500 in Birmingham.
| City | Average · range |
|---|---|
| Mobile, AL2% more | $9,250$6,300 – $12,200 |
| Huntsville, AL3% more | $9,400$6,400 – $12,400 |
| Birmingham, AL5% more | $9,500$6,450 – $12,500 |
HVAC replacement price in Montgomery: questions
How much does a new HVAC system cost in Montgomery, AL?
About $9,050 for a 3-ton system with central AC + gas furnace, and most Montgomery quotes fall between $6,200 and $12,000. That is 14% below the U.S. average, where the same job averages $10,500.
What is the HVAC price per ton in Montgomery?
$2,061 to $3,984 per ton, about $3,023 on average with central AC + gas furnace. Smaller jobs cost more per unit, because the fixed costs are spread over less.
How much is a 4-ton system in Montgomery?
$7,000 to $13,500, about $10,300 on average, with central AC + gas furnace — $2,565 per ton.
Do you need a permit for HVAC replacement in Montgomery?
Yes — installing HVAC or fuel-burning equipment needs a permit nearly everywhere, Montgomery included. The prices on this page carry $150–$400 for the permit and inspection.
Does the price include sales tax in Alabama?
No. The prices here are before tax; Alabama's base state rate is 4%, plus any local rate.
What size HVAC system does a house in Montgomery need?
It is worked out with a Manual J load calculation for the house — included in the prices above — not from square footage alone. Here it is run against design temperatures of about 94°F in summer and 24°F in winter (the Alabama median).
Other home projects in Montgomery
HVAC replacement cost in Alabama
How these prices are built
Every price on this page comes from JobFlex's contractor price book: what a homeowner pays a licensed contractor for each step of the job, as a U.S. national average per unit, with the contractor's overhead and profit included and sales tax left out. The HVAC replacement is priced step by step, then multiplied by Montgomery's construction cost index of 0.86.
Where the price book's steps for an option add up to more than 20% over the installed price a published source gives for the whole job, every step but a permit fee is scaled down to the middle of that range: central AC + gas furnace × 0.76 (HomeCostCalcs 2026: $7,000–$14,000); heat pump + air handler × 0.76, following central AC + gas furnace; cold-climate heat pump + air handler × 0.76, following central AC + gas furnace.
The index weighs local construction wages (BLS Occupational Employment and Wage Statistics, May 2025) at 60% and the area's material prices (Craftsman ZIP-area factors) at 40%. Published indices for Montgomery, each on its own base: HUD 0.87, Craftsman 0.99. Treat any city figure as about ±5%; a contractor's quote for your house is the number to plan with.
Contractors in Montgomery build quotes like these with JobFlex's HVAC estimator.
- HomeCostCalcs 2026: furnace + AC replacement $7,000-$14,000 standard, $10,000-$20,000 high efficiency
- Today's Homeowner 2025: complete HVAC system install $5,000-$12,500