Furnace Replacement Cost in Madison, Wisconsin
Expect to pay $4,000 to $9,700 for furnace replacement in Madison, WI. Most homeowners end up near $7,100, depending on the equipment tier and how much of the old setup can be reused.
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Madison Weather and HVAC Load
In a normal year, Madison racks up 7,096 heating and 639 cooling degree days (NOAA 1991-2020 normals). Heating is the bigger job here, and furnaces and heat pumps in Madison put in far more hours than the air conditioner. On average, Madison gets 157 freezing nights and 10 days above 90°F per year. Snowfall averages about 39 inches. For a 2,000 sq ft house, this climate points to a heating load somewhere near 70,000 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 | 7,096 |
|---|---|
| Cooling degree days / year | 639 |
| Nights at or below 32°F | 157 |
| Days above 90°F | 10 |
| Average low / high | 37.3°F / 57.1°F |
Madison Housing Stock
Half the homes in Madison were built before 1979 (Census ACS median), so the typical house is about 47 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. Madison has roughly 59,000 owner-occupied homes, or 46.6% of households. Homes here have a median value of $346,900 and households a median income of $76,983. Those two numbers drive the labor adjustment in our estimate.
Between 2020 and 2025, NOAA's Storm Events Database logged 24 hail days and 30 days with damaging thunderstorm winds in Dane County. The largest hail reported was 2.5 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. Dane County also had 7 tornado days in that period.
When Replacement Makes Sense
- Gas or electric bills keep climbing even though usage hasn't changed
- A tech found a cracked heat exchanger, or the CO detector has gone off
- A repair quote runs past a third of the cost of a new unit
- The furnace is 15 to 20 years old or more
What Moves the Price
- AFUE rating: a basic 80% unit vs. a 96% condensing furnace
- Single-stage, two-stage or modulating gas valve
- New PVC venting if you move to a condensing model
- BTU size, which should come from a Manual J load calculation
- Condition of the existing ductwork and any changes it needs
- Permit and inspection fees, which the local building department sets
For Madison we raised the national figures about 24%, 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
- The permit and the manufacturer warranty registration
- Gas line and vent connections
- Removing and hauling away the old furnace
- Combustion and safety tests
- The new furnace, filter rack and thermostat wiring
Wisconsin Permits, Efficiency Rules and Rebates
Wisconsin falls in the DOE's North region. New split central air conditioners must meet at least 13.4 SEER2, and heat pumps sold anywhere in the U.S. need 14.3 SEER2 and 7.5 HSPF2. Expect the contractor to pull a mechanical permit for a replacement job in Madison. If a bidder suggests skipping it, move on. Also ask for a Wisconsin 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
- 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.
- Ask for the Manual J load calculation in writing. Oversized furnaces are the most common mistake we see.
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Furnace Replacement Questions from Madison Homeowners
How much is furnace replacement in Madison?
Plan on $4,000 to $9,700, with most jobs near $7,100. 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 Madison?
Between late spring and early fall. Madison averages 157 freezing nights a year, and heating calls spike from November through February.
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 Madison
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Uw Arboretum Madison; NOAA Storm Events Database 2020-2025, Dane County. Prices are our estimates, not contractor quotes. Updated 2026.