Installed Furnace Cost in Illinois
A standard furnace replacement in Illinois can cost anywhere from $5,600 to $10,800. In part, this depends on where in Illinois you live. Homes in colder parts of the state may need larger or more efficient furnaces, which will be more expensive. It also depends on how complex your unique installation is. This price range includes the furnace unit, labor for removal/installation, minor duct adjustments, and permit costs. Exclusions typically include full duct system redesign, asbestos remediation, or electrical panel upgrades.
New Furnace Cost (Table) – Illinois
| Furnace Type | Typical Size (BTU) | AFUE | Equipment | Install | Total Installed |
|---|---|---|---|---|---|
| Single-Stage Gas | 60–100k | 80–95% | $2,000–$3,200 | $2,600–$4,200 | $5,600–$7,400 |
| Two-Stage Gas | 80–120k | 90–96% | $2,800–$3,800 | $3,200–$4,600 | $6,400–$8,400 |
| Modulating / VS | 80–120k | 95–98% | $3,600–$5,000 | $3,800–$5,800 | $7,800–$10,800 |
Methodology: Based on ~250 recent installs/leads in Illinois + national MSRP bands, adjusted for Illinois labor and permitting norms. Last updated Sept 2025.
Need help with some of the above terms? Visit our guide to heating systems to learn about the differences between single-stage, two-stage, and modulating furnaces. We also have a blog post dedicated to understanding AFUE ratings.
Gas & Electric Rates in Illinois
How much does the average homeowner in Illinois spend on heating their homes? Knowing this may help you decide on a budget for your new furnace.
Average Cost to Run a Gas Furnace in Illinois
With average natural gas costs running at $1.20/therm, heating with a 95% AFUE furnace costs roughly $1,200–$2,000 per heating season for a 2,000-sf home (5,500–7,000 HDD).
Average Cost to Run an Electric Furnace in Illinois
At 14.8¢/kWh, heating with an electric furnace costs roughly $4,100–$6,900 per heating season for a 2,000-sf home (≈5,500–7,000 HDD).
Illinois Climate Zones & Heating Degree Days
Illinois contains zones CZ 5A (Chicago, Springfield) and CZ 5B/6A (northern IL). The colder the zone you live in, the more likely it is you will need a larger furnace size or a more efficient furnace (or both). You can read more about what size furnace you need in Illinois as well as use Modernize’s furnace size calculator.
State HDD average: 6,300 (1991–2020 normals). This stat measures how much energy is needed to heat a home or building based on how far the average daily temperature in winter falls below 65 degrees. And in Illinois, we know it can fall far below that.
Coldest metros: Rockford and Chicago suburbs.
Incentives in Illinois
As of September 2025, here are the furnace-related incentives we found for Illinois as a whole. We included links to city-specific rebates and incentives in our city guides, linked below.
Illinois Energy Efficiency Programs: ComEd Home Heating and Cooling Discounts & Nicor Gas Energy Efficiency Rebates offer up to $350–$500 for high-efficiency gas furnaces.
Federal Programs: The Federal 25C Tax Credit offers up to $600 for ENERGY STAR® furnaces.
Codes & Permitting
Illinois follows the 2018 IECC (with amendments). Furnace permits are generally required by city/county, with stricter enforcement in Chicago metro.
City-Level Cost & Permit Guides
- Chicago — cost bands, city permit portal, ComEd/Nicor rebates →
- Bloomington — local pricing, permit link, rebates →
- Rockford — costs for the colder climate, utility rebate guidance →
- Springfield — local cost ranges, permit info, Ameren and CWLP rebates →
Get Quotes
Need help finding a contractor? You can browse furnace installers in Illinois, read reviews, and find promotions, or you can have us do the research for you. Modernize can connect you with up to four furnace pros in your area.
✔️ All contractors screened for license & insurance.
Methodology
To supply the cost and energy information we provided above, we used 250+ Illinois installations, national MSRP bands, RS Means labor data, ICC codes, EIA utility rates, NOAA HDD data. This page is updated quarterly, and will next be updated in December 2025.
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