55
EstablishedGranite City, Illinois · Heating & furnaces
Heating & furnace contractors in Granite City, IL
7 heating & furnace contractors in Granite City, out of 8 HVAC and plumbing businesses the Registry lists there. Ranked by Registry Score, owner-confirmed records first.
- Pros
- 7
- Avg. score
- 51
- Scored
- 6
Summary
Data last updatedAs of October 14, 2026, the ProComfort Registry lists 7 heating & furnace contractors in Granite City, Illinois. Most-listed specialties: air conditioning (7). 6 have enough public signals for a Registry Score, averaging 51 out of 100; 1 scores 70 or higher. Together they hold 247 public reviews on Google, Yelp and Facebook. The highest-scored is Koesterer Heating And Cooling Inc, at 74 out of 100. 1 is Featured for 2026. View Koesterer Heating And Cooling Inc.
Counts come straight from the Registry's records. How the Registry Score works
Featured heating & furnace contractors in Granite City
Showing 1–7 of 7
74
StrongGranite City, IL 62040 4.8(91 reviews)
HVACHeatingA/C
66
EstablishedGranite City, IL 62040 4.7(19 reviews)
HVACHeatingA/C
59
EstablishedGranite City, IL 62040 4.2(23 reviews)
HVACHeatingA/C
55
EstablishedGranite City, IL 62040 3.8(83 reviews)
HVACHeatingA/C
45
Developing7
Developing—
Not yet ratedHeating & furnace contractors in Granite City: at a glance
- How many heating & furnace contractors are in Granite City, Illinois?
- As of October 14, 2026, the ProComfort Registry lists 7 heating & furnace contractors in Granite City, Illinois.
- Who is the highest-scored heating contractor in Granite City, Illinois?
- By Registry Score, Koesterer Heating And Cooling Inc (Granite City, IL) ranks first at 74 out of 100, among 6 scored businesses averaging 51. The score combines public reviews (50 points), digital presence (30) and reach (20); nobody can pay for a higher score.
- Which companies are featured in Granite City, Illinois for 2026?
- ProComfort Registry features Dixon Heating Cooling. Featured companies are selected editorially from public reviews and track record; listings and rankings are never sold.
- How are heating & furnace contractors in Granite City, Illinois ranked?
- By Registry Score (0-100, from public reviews, digital presence and reach), with records confirmed by their owners listed first. The full method is at https://procomfortregistry.online/methodology.
What this list includes: businesses whose public category or name points to heating: furnaces, boilers, heat pumps or radiant heat. Tags come from each business's public category and name, so a company can appear under several trades. Heating & furnace contractors across the US