Status checked September 14, 2026 · Program rules can change quickly
The short answer
Illinois has no dedicated statewide heat-pump rebate program. What exists instead is a set of utility efficiency programs — run by Commonwealth Edison (ComEd) in the Chicago area and northern Illinois, and by Ameren Illinois downstate — funded through a state law called the Climate and Equitable Jobs Act (CEJA), which requires utilities to spend a share of customer bills on energy efficiency and electrification (Illinois EPA, CEJA overview).
The bigger federal money that other states have already started distributing — the Inflation Reduction Act's Home Efficiency Rebates (HOMES) and Home Electrification and Appliance Rebates (HEAR) programs — has not reached Illinois homeowners yet. Illinois EPA was awarded $263 million for both programs, but as of this check, the HOMES pilot is still awaiting final U.S. Department of Energy (DOE) approval to launch, and Illinois's HEAR application has not yet been processed by DOE at all (Illinois EPA, Energy Rebates status). Neither program has a confirmed launch date. Until one opens, ComEd and Ameren rebates are the only broadly available incentive dollars in the state.
Two federal tax credits that used to help are also gone. The 25C credit for air-source heat pumps and the 25D credit for geothermal systems both expired for any equipment placed in service after December 31, 2025, eliminated without a phase-down by the One Big Beautiful Bill Act signed July 4, 2025 (federal tax credit tracking, 2026 update). An Illinois homeowner installing today is working with utility rebates and utility rebates only.
The fuel-cost arithmetic, and Illinois's odd twist
Compare gas and electricity on the same footing: what it costs to deliver one kilowatt-hour of heat into the house. This is where Illinois looks different from every other state in this series.
Illinois residential gas averaged $9.65 per thousand cubic feet in January 2026 — the dead center of the heating season (EIA, Illinois residential natural gas prices). That is unusually cheap for January. In most states residential gas prices climb through winter as demand rises. Illinois runs backward: December 2025 gas was $9.48/Mcf and November was $10.70/Mcf, while the same market hit $22.81/Mcf in July and $21.51/Mcf in September — more than double the winter price, in months when almost no one is heating (EIA, Average Residential Price). We haven't found a clean public explanation for the exact mechanism, but it is consistent with fixed monthly service charges and storage-injection costs being spread over a smaller volume of gas in summer and a much larger volume in winter. Whatever the cause, the practical effect is that Illinois heating bills are being priced against unusually cheap gas, not expensive gas.
At $9.65 per thousand cubic feet, that works out to about 96.5¢ per therm. A therm holds roughly 29.3 kilowatt-hours of heat, and a 92%-efficient furnace delivers about 27 of them — so gas heat costs around 3.6 cents per kilowatt-hour, among the cheapest heating costs of any state we've covered.
Illinois's average residential electricity price was 19.89 cents per kilowatt-hour in June 2026, close to the national average and well below what New York or Massachusetts pay (EIA Electric Power Monthly). A heat pump running at a seasonal coefficient of performance of 3.0 turns each kilowatt-hour of electricity into three of heat, delivering that heat at about 6.6 cents per kilowatt-hour.
| Heating source | Fuel price | Cost per kWh of heat |
|---|---|---|
| Gas furnace, 92% efficient (Jan 2026 price) | 96.5¢ / therm | 3.6¢ |
| Heat pump, seasonal COP 3.0 | 19.89¢ / kWh | 6.6¢ |
| Heat pump, seasonal COP 5.6 | 19.89¢ / kWh | 3.6¢ |
Scroll the table sideways to see the cost-per-kilowatt-hour column.
The breakeven coefficient of performance is about 5.6 — higher than any cold-climate heat pump sustains over a Chicago winter. Stated the other way, a heat pump running at a coefficient of performance of 3.0 only matches gas on running cost if electricity falls to roughly 10.7 cents per kilowatt-hour, well under half of what Illinois actually charges.
Put a household behind those numbers. A home burning 600 therms a year on space heating — typical for a Chicago-area single-family house — spends about $579 on gas at the January 2026 price. Delivering the same heat with a heat pump at a coefficient of performance of 3.0 takes roughly 5,390 kilowatt-hours, or about $1,072.
Annual gas heating: 600 therms × 96.5¢ = $579
Same heat by heat pump: 5,391 kWh × 19.89¢ = $1,072
Annual operating penalty: −$493
Over 15 years: −$7,400
A $7,400 lifetime penalty is real money, but it is smaller than the $9,960 penalty we calculated for New York on the same method — because Illinois gas is genuinely cheap in the months that matter, not because Illinois electricity is expensive. No Illinois utility rebate comes close to offsetting it. That gap has to be closed by a fuel switch to something other than gas, a milder climate posture (more cooling load, less heating), or lower operating cost from a rate designed around off-peak electricity use.
That last option is new, and it's the most interesting thing happening in Illinois heat-pump economics right now.
A new time-of-use rate could change the math — but not yet, and not by itself
In 2025, the Illinois Commerce Commission approved ComEd's request to offer residential customers an optional time-of-use rate, branded Rate BEST, expected to become available to customers in 2026 (Environmental Defense Fund, ICC rate approval). It's an opt-in delivery-charge rate, not a change to the default bill, and it replaces a flat delivery charge with four daily pricing windows built around when the regional grid is most strained.
The tentative structure splits the day into four blocks, with the 1–7 p.m. window priced well above ComEd's standard delivery rate and the overnight hours priced well below it (Citizens Utility Board, rate design summary). Final tariffed rates may differ from these tentative figures.
Tentative Rate BEST delivery pricing by time of day
Two things temper how much this helps a heat-pump household today. First, these are delivery rates only — roughly a third of a typical Illinois bill — not the full retail price used in the arithmetic above, so the achievable swing is smaller than the bar chart alone suggests. Second, a heat pump's heaviest draw during a Chicago winter often lands in early morning recovery and evening hours that straddle the peak window, not cleanly inside the cheap overnight block, so actual savings depend heavily on thermostat scheduling and how well the house holds heat overnight.
Rate BEST is worth watching, not worth banking on yet. Once final tariffed rates and a hard launch date are published, it will be the first real test of whether Illinois will build the kind of heat-pump-favorable rate that Con Edison and Massachusetts utilities already offer.
What you can actually get
Illinois splits into two utility territories with separate rebate menus. Which one applies depends entirely on your electric utility, not your county or your gas provider.
| Efficiency tier | Standard | With ENERGY STAR smart thermostat |
|---|---|---|
| ≥15.2 SEER2 / ≥9.4 EER2 / ≥8.1 HSPF2 | $1,200 | $1,275 |
| ≥17 SEER2 / ≥9.4 EER2 / ≥8.5 HSPF2 | $1,600 | $1,675 |
| Ductless / mixed-use mini-split, ≥17 SEER2 / ≥10 HSPF2 | $1,000 | $1,075 |
Scroll the table sideways to see the smart-thermostat column.
ComEd's discounts are instant, applied by the installing contractor at the time of sale, and require an enrolled ComEd Energy Efficiency Service Provider — self-installed or non-enrolled-contractor jobs don't qualify (ComEd, heating & cooling rebate FAQ). Equipment efficiency must be verified through the Air Conditioning, Heating and Refrigeration Institute (AHRI) database, and a handful of towns served by municipal electric utilities — including Naperville, St. Charles, Geneva, Batavia and Winnetka — are outside ComEd's territory and don't qualify at all.
| Equipment | Instant discount |
|---|---|
| Ducted air-source heat pump (≥15.2 SEER2 / ≥8.1 HSPF2) | $900 |
| Ductless mini-split heat pump (≥16 SEER2 / ≥8.55 HSPF2) | $630 |
| Ground-source (geothermal) heat pump | $1,350–$5,400 |
| Geothermal, add desuperheater | +$500 |
| Heat pump water heater | $1,150 |
Scroll the table sideways if needed.
Ameren's geothermal range is the standout figure on this page — it's the one Illinois rebate that starts to look like what New York or Massachusetts offer for a whole-house fossil-fuel replacement, though ground-source installations cost far more upfront than air-source equipment, so the rebate is covering a bigger number to begin with. Ameren also requires the home's primary heating fuel to come from an Ameren-delivered source; propane-heated homes don't qualify (Ameren Illinois, HVAC & water heating discounts).
Neither utility currently publishes an income-qualified enhanced tier specific to heat pumps the way New York's EmPower+ program does. Illinois EPA's forthcoming HOMES and HEAR rebates are expected to add an income-based layer — low-income households (under 80% of area median income) are slated for the largest share of that funding once it launches — but that money isn't available yet (Illinois EPA, Energy Rebates).
What to confirm before you install
- Which utility serves your address. ComEd and Ameren Illinois run entirely separate rebate menus with different dollar amounts and different minimum efficiency ratings. A handful of municipal-electric towns in ComEd's footprint aren't eligible for ComEd rebates at all.
- Whether your contractor is enrolled. ComEd rebates require an enrolled Energy Efficiency Service Provider; Ameren's geothermal discount requires Illinois Commerce Commission geothermal certification. A quality installer who isn't enrolled in the right program won't get you the rebate.
- Whether the AHRI-certified rating actually clears the tier you're expecting. Both utilities pay a materially different amount depending on which SEER2/EER2/HSPF2 tier the specific matched system certifies at — not the nameplate rating on the outdoor unit alone.
- Whether Rate BEST has launched with final pricing by the time you're comparing operating costs. The tentative peak/off-peak spread above could still change before the tariff is finalized.
- Whether Illinois EPA's HOMES or HEAR rebates have opened. If they launch while your project is in planning, they could add income-qualified dollars on top of your utility rebate — but as of this check, neither has a confirmed date.
What Illinois homeowners should do next
Don't assume the national headlines about big heat-pump rebates apply here. Illinois's rebate stack tops out in the low thousands from your utility, not the $8,000–$12,000 seen in New York or Massachusetts, and the federal layer that would close that gap is still stuck in DOE review.
Do the fuel-cost math for your own house before you assume a heat pump saves money on gas. Illinois's cheap winter gas price is a genuine, citable oddity, and it means the running-cost case against switching is stronger here than in most states we've covered — the rebate available today doesn't fully offset it.
If a heat pump is still the right call for you — central air replacement timing, all-electric construction, better summer cooling, decarbonization goals — time the purchase around whichever utility rebate tier your matched system clears, and keep an eye on Rate BEST's final launch terms once tariffed.
Where to check the current rules
- ComEd heating & cooling rebate FAQCurrent instant discount tiers and enrolled-contractor requirement.
- Ameren Illinois HVAC & water heating discountsRebate amounts and eligibility for the downstate territory.
- Illinois EPA, Energy RebatesHOMES and HEAR program status and funding allocation.
- Climate and Equitable Jobs Act overviewThe state law funding utility efficiency and electrification programs.
- Citizens Utility Board, Rate BEST summaryTentative time-of-use pricing and ICC docket details.
- EIA residential electricity pricesCurrent state-level electricity rates.
- EIA Illinois residential natural gas pricesMonthly price history showing the reverse-seasonal pattern.