Illinois HVAC leads
Gas heat defines Illinois housing: in the Census Bureau’s table B25117, 81.7% of owner-occupied homes use utility gas, a share only one state tops, and NOAA logged 5,887 heating degree days in 2025. HVAC is now onboarding at Summit Leads, so no HVAC leads are delivered in Illinois yet; buyers can join the HVAC list now.
Now onboardingHVAC is being added to Summit Leads and is not live yet. Summit is accepting interest from HVAC lead buyers now: email us the states, filters and delivery method you want, and we will contact you when HVAC leads open.
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Illinois facts for HVAC lead buyers
| Fact | Value Source |
|---|---|
| Owner-occupied homes heated by utility gas | 81.7% (2,761,717 of 3,378,910 owner-occupied units; ACS 5-year 2020-2024, table B25117), 2nd highest of the 50 statesTable B25117, Tenure by House Heating Fuel: Illinois (ACS 5-Year 2020-2024) U.S. Census Bureau |
| Owner-occupied homes heated by electricity | 12.0% (404,624 units; ACS 5-year 2020-2024)Table B25117, Tenure by House Heating Fuel: Illinois (ACS 5-Year 2020-2024) U.S. Census Bureau |
| Owner-occupied homes heated by bottled, tank or LP gas | 5.0% (168,348 units; ACS 5-year 2020-2024)Table B25117, Tenure by House Heating Fuel: Illinois (ACS 5-Year 2020-2024) U.S. Census Bureau |
| All occupied homes heated by utility gas | 75.3% of 5,036,449 occupied units (ACS 5-year 2020-2024, table B25040)Table B25040, House Heating Fuel: Illinois (ACS 5-Year 2020-2024) U.S. Census Bureau |
| All occupied homes heated by electricity | 18.6% of 5,036,449 occupied units (ACS 5-year 2020-2024, table B25040)Table B25040, House Heating Fuel: Illinois (ACS 5-Year 2020-2024) U.S. Census Bureau |
| Heating degree days, 2025 | 5,887 (1991-2020 average 6,105), 17th highest of the 48 states with a statewide seriesClimate at a Glance: Illinois heating degree days, January-December, 1895-2025 NOAA National Centers for Environmental Information |
| Cooling degree days, 2025 | 1,042 (1991-2020 average 889), 23rd highest of the 48 states with a statewide seriesClimate at a Glance: Illinois cooling degree days, January-December, 1895-2025 NOAA National Centers for Environmental Information |
| Owner-occupied housing units | 3,378,910 of 5,036,449 occupied units, with 1,657,539 renter households (ACS 5-year 2020-2024)Table B25003, Tenure: Illinois (ACS 5-Year 2020-2024) U.S. Census Bureau |
| Cook County owner-occupied homes heated by utility gas | 88.0% of 1,212,570 owner-occupied units (ACS 5-year 2020-2024, county table B25117)Table B25117, Tenure by House Heating Fuel: Illinois counties (ACS 5-Year 2020-2024) U.S. Census Bureau |
| Madison County owner-occupied homes heated by electricity | 24.5% of 81,716 owner-occupied units, the highest electric share of the ten largest owner counties (ACS 5-year 2020-2024)Table B25117, Tenure by House Heating Fuel: Illinois counties (ACS 5-Year 2020-2024) U.S. Census Bureau |
| Home Efficiency Rebates (HOMES) in Illinois | Pilot with two Local Administering Agencies planned; launch pending U.S. DOE approval (Illinois EPA Office of Energy, checked October 8, 2026)Energy Rebates: Home Energy Rebate Programs Illinois Environmental Protection Agency, Office of Energy |
| Home Electrification and Appliance Rebates (HEAR) in Illinois | Application not yet processed by U.S. DOE (Illinois EPA Office of Energy, checked October 8, 2026)Energy Rebates: Home Energy Rebate Programs Illinois Environmental Protection Agency, Office of Energy |
Last reviewed: October 8, 2026. A summary for education, not legal advice.
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How Illinois homes are heated
Four in five Illinois owner-occupied homes burn utility gas. The Census Bureau’s table B25117 (ACS 5-year 2020-2024) counts 2,761,717 of 3,378,910 owner homes on utility gas, or 81.7%, the second highest share in the country. Electricity heats 12.0% and bottled, tank or LP gas 5.0%; every other fuel together accounts for under 2%.
| Heating fuel | Owner-occupied homes | Share | Source |
|---|---|---|---|
| Utility gas | 2,761,717 | 81.7% | ACS 2020-2024, B25117 |
| Electricity | 404,624 | 12.0% | ACS 2020-2024, B25117 |
| Bottled, tank or LP gas | 168,348 | 5.0% | ACS 2020-2024, B25117 |
| Fuel oil, kerosene, solar, coal and other fuels | 18,009 | 0.5% | ACS 2020-2024, B25117 |
| Wood | 15,462 | 0.5% | ACS 2020-2024, B25117 |
| No fuel used | 10,750 | 0.3% | ACS 2020-2024, B25117 |
Among all 5,036,449 occupied homes, owners and renters, utility gas heats 75.3% and electricity 18.6% (table B25040 (2020-2024 ACS)). A buyer reads this as an equipment profile: in Illinois the heating system to repair or replace is usually a gas furnace or boiler. The fuel shares describe homes, not how many requests any type of home produces.
Degree days: Illinois winters and summers
Illinois has both a real winter and a real summer. NOAA’s Climate at a Glance heating series puts 2025 at 5,887 heating degree days, below the 1991-2020 average of 6,105 but still 17th highest of the 48 states with a statewide series.
On the cooling side, the cooling degree day series shows 1,042 for 2025, above the 1991-2020 average of 889 and in the middle of the 48 states at 23rd. A furnace and an air conditioner both get steady use, so heating and cooling requests each have a season.
Reading the figures: each degree day is one degree between a day’s mean temperature and 65°F. NCEI totals them from January to December in each statewide series; the averages here are the mean of the annual totals for 1991 through 2020.
Illinois HVAC contractor licensing
This section is general information, not legal advice. It summarizes official sources as of October 8, 2026; check the current text of each rule before relying on it.
The Illinois Attorney General’s guide Home Repair and Construction: How to Choose a Contractor (rev. July 2026) names two trades with state licenses, roofers through the Department of Financial and Professional Regulation and plumbers through the Department of Public Health, and it lists no state license for heating and cooling contractors. The same guide says contractors may need a permit from the municipality where they work, so local requirements are the ones a buyer’s contractors check.
Federal rules apply in every state: technicians who handle refrigerant must be certified under EPA Section 608. The state’s general contractor and insurance rules are on the Illinois window replacement page linked below.
Illinois owners and renters for HVAC buyers
The 2020-2024 ACS counts 3,378,910 owner-occupied homes and 1,657,539 renter households in Illinois, among 5,036,449 occupied homes (table B25003). Two in three households own, and owners are the ones who approve and pay for a new furnace or central air system.
Illinois housing age, its energy code and contractor rules are on Illinois window replacement leads and are not repeated on this page.
Illinois HOMES and HEAR rebate status
The Illinois EPA Office of Energy administers the state’s share of the federal Home Energy Rebate Programs. Its Energy Rebates page (checked October 8, 2026) says HOMES funding has been awarded, with the program to be implemented by the Department of Commerce and Economic Opportunity, and that a pilot with two Local Administering Agencies will launch once the U.S. Department of Energy approves it.
For HEAR, the electrification and appliance program that covers equipment such as heat pumps, the same Energy Rebates page says the Illinois application has not yet been processed by the Department of Energy. Illinois plans to direct the rebate funds first to households under 80% of area median income (checked October 8, 2026) and does not plan retroactive rebates. No rebate amounts appear on this page.
Illinois counties by owner-occupied homes
The ten Illinois counties with the most owner-occupied homes and the share heated by utility gas and by electricity, from the ACS 5-year 2020-2024 county tables B25003 and B25117. The rows describe each county’s housing and say nothing about lead origin.
| County | Owner-occupied homes | Heated by utility gas | Heated by electricity | Source |
|---|---|---|---|---|
| Cook | 1,212,570 | 88.0% | 9.7% | ACS 2020-2024, B25003 and B25117 (county) |
| DuPage | 256,474 | 90.8% | 7.7% | ACS 2020-2024, B25003 and B25117 (county) |
| Will | 202,150 | 91.9% | 5.6% | ACS 2020-2024, B25003 and B25117 (county) |
| Lake | 193,403 | 90.6% | 8.0% | ACS 2020-2024, B25003 and B25117 (county) |
| Kane | 140,301 | 92.1% | 6.2% | ACS 2020-2024, B25003 and B25117 (county) |
| McHenry | 97,259 | 90.7% | 6.1% | ACS 2020-2024, B25003 and B25117 (county) |
| Madison | 81,716 | 66.8% | 24.5% | ACS 2020-2024, B25003 and B25117 (county) |
| Winnebago | 76,408 | 91.1% | 5.4% | ACS 2020-2024, B25003 and B25117 (county) |
| St. Clair | 69,023 | 70.5% | 22.6% | ACS 2020-2024, B25003 and B25117 (county) |
| Sangamon | 60,443 | 77.6% | 16.1% | ACS 2020-2024, B25003 and B25117 (county) |
Cook County alone holds 1,212,570 owner homes, and it and the five collar counties around it all run from 88.0% to 92.1% gas heat. Madison (24.5% electric) and St. Clair (22.6% electric), across the river from St. Louis, have the largest electric shares in the ten, per the same county data (2020-2024 ACS).
Reading the Illinois numbers before buying
Read together, the Illinois figures describe a gas furnace market with a full cooling season. Three points for a buyer:
- Gas equipment dominates. 81.7% of owner homes on utility gas in the 2020-2024 ACS means gas furnace and boiler skills cover most Illinois heating work.
- Two seasons of load. 5,887 heating and 1,042 cooling degree days in 2025 in the NCEI series give both furnace and air conditioning work a regular season.
- Metro East is different. Madison and St. Clair have more than twice the electric share of the Chicago-area counties in the county table, so heat pump and electric furnace crews have a clearer fit there.
These points rest on official housing and climate data and make no estimate of how many Illinois homeowners request HVAC work.
What Illinois HVAC buyers filter on
Illinois HVAC buyers filterFilterA rule that decides which leads a buyer is offered, based on fields such as vertical, sub-type, state, ZIP code, homeownership or accident details. Glossary on the same kinds of fields as other home services buyers. In Illinois, they relate to the data above as follows:
- Project type: for example install, replace or repair, for heating or cooling. With gas heat this common, furnace and boiler work stands beside summer air conditioning requests.
- Homeowner status: two in three Illinois households own, and owners sign for new equipment.
- Timeframe: a heating failure that needs a visit now, or a replacement scheduled for the off-season.
- ZIP code: for example the Chicago collar counties versus the Metro East counties near St. Louis.
When HVAC opens, Illinois buyers will set these filters per campaign, down to the ZIP code, as on Summit’s other home services leads. Once HVAC opens, HVAC leads will be exclusive by default, with shared delivery on request. A full example is on the sample HVAC lead.
Where buyers filter in Illinois
Illinois HVAC contractors generally serve one metro area at a time. The six largest metro areas with Illinois counties, from the Census Bureau’s July 1, 2025 estimates, follow; Chicago reaches into Indiana and St. Louis is mostly in Missouri, so both show whole metro area totals. Once HVAC opens, buyers will be able to set coverage on any ZIP code, inside these areas or outside them.
- Chicago-Naperville-Elgin, IL-IN: 9,434,123 (July 1, 2025 estimate, whole metro area)
- St. Louis, MO-IL: 2,814,421 (July 1, 2025 estimate, whole metro area)
- Peoria: 363,505 (July 1, 2025 estimate)
- Rockford: 337,242 (July 1, 2025 estimate)
- Champaign-Urbana: 239,979 (July 1, 2025 estimate)
- Springfield: 206,033 (July 1, 2025 estimate)
Source: Metropolitan and Micropolitan Statistical Area population estimates, Vintage 2025 (cbsa-est2025-alldata), U.S. Census Bureau.
Consent records for Illinois HVAC leads
When HVAC opens, each Illinois HVAC lead will carry the TCPATCPAThe Telephone Consumer Protection Act, the federal law that governs telemarketing calls and texts, autodialers, prerecorded voice messages and the Do Not Call Registry. Glossary consent record captured on the form. State calling rules that apply in Illinois in addition to the TCPA are listed under Illinois in the state telemarketing laws table, and the state’s combined MVA and home improvement page is leads in Illinois.
Illinois HVAC lead questions
What share of Illinois owner-occupied homes heat with utility gas?
81.7%, or 2,761,717 of 3,378,910 owner-occupied homes, in the Census Bureau’s ACS 5-year estimates for 2020-2024 (table B25117). Only one state has a higher utility gas share.
Were Illinois heating degree days above or below average in 2025?
Below: NOAA NCEI’s Climate at a Glance series shows 5,887 heating degree days in 2025, against a 1991-2020 average of 6,105. Cooling degree days were above average, at 1,042 against 889.
Does the Illinois Attorney General’s contractor guide list a state HVAC license?
No. The guide (rev. July 2026) names roofers and plumbers as state-licensed trades and says contractors may need a municipal permit; it lists no state license for heating and cooling contractors. This is general information, not legal advice.
Which large Illinois counties have the most electric heat?
Madison (24.5%) and St. Clair (22.6%), the highest electric shares among the ten counties with the most owner-occupied homes in the ACS 5-year county data for 2020-2024 (table B25117).
Can Illinois HVAC leads be narrowed to particular ZIP codes?
Not yet: HVAC is now onboarding. When it opens, buyers will set filters down to the ZIP code, as on Summit’s other home services leads, and leads will be exclusive by default.
Join the Illinois HVAC buyer list
HVAC is not live yet. Email us the Illinois ZIP codes you cover, your daily volume or caps and how you take delivery, and we will contact you when HVAC leads open.
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- MVA and home improvement leads are exclusive by default: each lead is sold to one buyer.
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