HVAC Replacement Cost in Madison, WI (2026)
Updated October 2026 · Madison, WI · index 1.09
How much does a new HVAC system cost in Madison? For a 3-ton system with central AC + gas furnace, homeowners in Madison, WI pay about $11,400 on average, and most quotes land between $7,800 and $15,000 — $2,599 to $5,014 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 Madison runs 9% above the U.S. average: construction labor in the Madison area runs 13% above the national mean, materials 2% above. The same job averages $10,500 nationally and about $10,900 at the Wisconsin statewide index.
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HVAC replacement price in Madison by system type
What a 3-ton system costs in Madison with each system type, installed:
| Option | Average · range |
|---|---|
| Central AC + gas furnacesplit AC, matched coil and an 80,000 BTU furnace$3,807 per ton | $11,400$7,800 – $15,000 |
| Heat pump + air handlerall-electric split heat pump, no furnace$3,530 per ton | $10,600$7,100 – $14,100 |
| Cold-climate heat pump + air handlervariable-speed heat pump rated for deep winter$4,034 per ton | $12,100$8,150 – $16,000 |
The least expensive option in Madison is heat pump + air handler, at about $10,600; cold-climate heat pump + air handler averages $12,100, 1.1 times as much.
Cost to replace an HVAC system in Madison by size
With central AC + gas furnace, priced for Madison, WI:
| Size | Average · range |
|---|---|
| A 2-ton system$4,954 per ton | $9,900$6,750 – $13,000 |
| A 3-ton system$3,807 per ton | $11,400$7,800 – $15,000 |
| A 4-ton system$3,233 per ton | $12,900$8,800 – $17,000 |
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: $3,233 per ton for a 4-ton system against $4,954 for a 2-ton system.
What an HVAC replacement in Madison includes
Line by line, the $11,400 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 | $80 – $250 |
| Mechanical permit and inspection | $150 – $400 |
| Old system removed, refrigerant recovered | $370 – $660 |
| Gas furnace (about 80,000 BTU) | $1,650 – $3,000 |
| Outdoor unit, set on a new pad | $2,500 – $4,650 |
| Matched indoor coil | $1,100 – $2,300 |
| New refrigerant line set (25 ft) | $410 – $660 |
| Disconnect, whip and thermostat wire | $230 – $370 |
| Condensate drain and safety switch | $120 – $290 |
| Gas connection and furnace venting | $350 – $650 |
| Plenums and transitions to the ducts | $290 – $660 |
| Programmable or smart thermostat | $250 – $460 |
| Evacuation and refrigerant charge | $120 – $250 |
| Start-up and commissioning | $120 – $290 |
| Warranty registration and walk-through | $60 – $150 |
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 Madison's index of 1.09; permit fees are not scaled.
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What affects HVAC replacement prices in Madison
Labor and materials in Madison
Construction wages in the Madison metro run 12% above the U.S. mean (BLS, May 2025), and specialty-contractor pay in the city's county moves that up by 1%, to 13% above the national mean. Materials in the area's ZIP codes price 2% above the national average. Together they give Madison a construction cost index of 1.09.
Where Madison sits in Wisconsin
Madison is the most expensive of the 4 Wisconsin cities in our index, against a statewide index of 1.04. Green Bay is the least expensive at 1.04.
Against the rest of the country
Of the 306 U.S. cities in JobFlex's index, Madison ranks 86th from the most expensive. The job that averages $11,400 here averages $10,500 at the national rate.
Climate a system is sized for in Wisconsin
Contractors size equipment for the local design temperatures. Across Wisconsin's counties the median is about 88°F on a hot summer day and -9°F on a cold winter night (ENERGY STAR county table), and your county can differ. Winters that cold are where a cold-climate heat pump or a furnace earns its price.
Sales tax in Wisconsin
Wisconsin's base state sales tax is 5%, 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 Madison 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 Wisconsin cities
A 3-ton system with central AC + gas furnace averages $11,400 in Madison; $11,300 in Waukesha, $10,900 in Green Bay, $11,300 in Milwaukee.
| City | Average · range |
|---|---|
| Waukesha, WI1% less | $11,300$7,750 – $14,900 |
| Green Bay, WI5% less | $10,900$7,450 – $14,400 |
| Milwaukee, WI1% less | $11,300$7,750 – $14,900 |
HVAC replacement price in Madison: questions
How much does a new HVAC system cost in Madison, WI?
About $11,400 for a 3-ton system with central AC + gas furnace, and most Madison quotes fall between $7,800 and $15,000. That is 9% above the U.S. average, where the same job averages $10,500.
What is the HVAC price per ton in Madison?
$2,599 to $5,014 per ton, about $3,807 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 Madison?
$8,800 to $17,000, about $12,900 on average, with central AC + gas furnace — $3,233 per ton.
Do you need a permit for HVAC replacement in Madison?
Yes — installing HVAC or fuel-burning equipment needs a permit nearly everywhere, Madison included. The prices on this page carry $150–$400 for the permit and inspection.
Does the price include sales tax in Wisconsin?
No. The prices here are before tax; Wisconsin's base state rate is 5%, plus any local rate.
What size HVAC system does a house in Madison 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 88°F in summer and -9°F in winter (the Wisconsin median).
Other home projects in Madison
HVAC replacement cost in Wisconsin
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 Madison's construction cost index of 1.09.
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 Madison, each on its own base: HUD 1.06, Craftsman 1.06. Treat any city figure as about ±5%; a contractor's quote for your house is the number to plan with.
Contractors in Madison 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