Furnace Replacement Cost in Des Plaines, Illinois
Expect to pay $3,900 to $9,600 for furnace replacement in Des Plaines, IL. Most homeowners end up near $7,000, depending on the equipment tier and how much of the old setup can be reused.
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Des Plaines Weather and HVAC Load
NOAA's 1991-2020 climate normals put Des Plaines at 5,974 heating degree days and 1,003 cooling degree days per year. Heating is the bigger job here, and furnaces and heat pumps in Des Plaines put in far more hours than the air conditioner. A normal year brings 121 nights at or below freezing and 17 days over 90°F. Snowfall averages about 38 inches. For a 2,000 sq ft house, this climate points to a heating load somewhere near 65,000 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 | 5,974 |
|---|---|
| Cooling degree days / year | 1,003 |
| Nights at or below 32°F | 121 |
| Days above 90°F | 17 |
| Average low / high | 43°F / 59.5°F |
Des Plaines Housing Stock
Census figures put the median build year in Des Plaines at 1966, so a typical house here has about 60 years on it. A lot of these homes are on their second or third system by now. The ductwork is usually original, and leaky joints are common. Des Plaines has roughly 18,000 owner-occupied homes, or 79.4% of households. The median home value is $318,200, and median household income is $94,303. We use both figures to adjust labor and pricing for this page.
Between 2020 and 2025, NOAA's Storm Events Database logged 27 hail days and 75 days with damaging thunderstorm winds in Cook County. The largest hail reported was 2.75 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. Cook County also had 8 tornado days in that period. In Des Plaines, 20.4% of residents are 65 or older. For older adults, a house with no heat in January or no AC during a heat wave is a medical risk. Mention it when you call, since many companies put those calls first.
When Replacement Makes Sense
- 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
- Gas or electric bills keep climbing even though usage hasn't changed
- Some rooms stay cold, the burner short-cycles, or the ignitor keeps failing
What Moves the Price
- BTU size, which should come from a Manual J load calculation
- Single-stage, two-stage or modulating gas valve
- Condition of the existing ductwork and any changes it needs
- New PVC venting if you move to a condensing model
- Permit and inspection fees, which the local building department sets
- AFUE rating: a basic 80% unit vs. a 96% condensing furnace
For Des Plaines we raised the national figures about 23%, 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
- Removing and hauling away the old furnace
- Gas line and vent connections
- The new furnace, filter rack and thermostat wiring
- Combustion and safety tests
Illinois Permits, Efficiency Rules and Rebates
Illinois 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. Equipment replacements in Des Plaines generally need a mechanical permit, and a reputable contractor will pull it for you. Ask for their Illinois license or registration number and a certificate of insurance with the quote. 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
- Look up utility rebates on 95%+ AFUE units before you buy.
- 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.
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Furnace Replacement Questions from Des Plaines Homeowners
How much is furnace replacement in Des Plaines?
Plan on $3,900 to $9,600, with most jobs near $7,000. 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 Des Plaines?
Between late spring and early fall. Des Plaines averages 121 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 Des Plaines
- Mount Prospect $4,200 to $10,200
- Skokie $4,100 to $10,000
- Orland Park $4,100 to $9,900
- Palatine $4,200 to $10,200
- Oak Lawn $3,700 to $8,900
- Decatur $3,000 to $7,400
- Bolingbrook $4,100 to $9,900
- Berwyn $3,600 to $8,800
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Chicago Ohare International Airport; NOAA Storm Events Database 2020-2025, Cook County. Prices are our estimates, not contractor quotes. Updated 2026.