Koesterer Heating and Cooling Inc
Koesterer Heating and Cooling Inc is a HVAC provider serving Granite City, IL. Rated 4.9★ with 106 Google reviews. See services, review signals, and request a quote.
HVACGranite City, IL
On this page
Company overview
- TradeHVAC
- Service areaGranite City, IL
- Google rating4.9★ (106 reviews)
- Phone(618) 451-7500
- Address3371 IL-162, Granite City, IL 62040, USA
Photos
Photos from Koesterer Heating & Cooling, J Hoop
What customers say
“They were here within the hour , tracked down the leaky valve and replaced, did the tune up and the price was reasonable. Will definitely use them and recommend them again!”
“Koesterer arrived on time to install our new furnace. They were done in less than four hours and did a great job - their work looks very professional and tidy. We’re totally happy with the quality of …”
“I can’t say enough good things about Chris and the team from Koesterer Heating and Cooling Inc. My HVAC unit went out overnight during several days of extreme heat, and with a 7-month-old at home, it …”
“The repair man that came to my home was very polite, friendly, and very knowledgeable! Even though the weather was bad and it was the weekend he made it over in a very short time!”
“They are quick, efficient and trustworthy. Kyle’s been out here twice he is very professional and gets the job done quick. highly recommend these guys”
Key highlights
Strengths
- Highly rated (4.9★ average)
- Large review volume (106 reviews)
Things to ask
- Confirm availability for your area and timeline
- Ask about warranty terms on parts and labor
- Request a written estimate before work begins
- Ask about payment plans or financing
Explore nearby research
Frequently Asked Questions
What services does Koesterer Heating and Cooling Inc offer?
Koesterer Heating and Cooling Inc provides: HVAC diagnosis, repairs, and full system installs. They serve residential and commercial customers in Granite City, IL.
What is Koesterer Heating and Cooling Inc's rating?
Koesterer Heating and Cooling Inc has a 4.9 out of 5 star rating based on 106 Google reviews.
Is this company licensed in Illinois?
All listed providers have a verified Illinois contractor license at time of publication. You can verify on the Illinois Department of Financial and Professional Regulation (state business registration) plus municipal HVAC licensing (e.g. City of Chicago Department of Buildings) lookup at https://online-dfpr.micropact.com/Lookup/LicenseLookup.aspx.
Does Koesterer Heating and Cooling Inc offer emergency service?
Contact them directly to ask about emergency availability and after-hours service.
How do I request a quote?
Use the CTA below to submit your ZIP. You can message this company alongside two or three other local pros for easy comparison.
Licensing verified 2026-04-22. Reviews refreshed 2026-04-22.
Licensing data: Illinois Department of Financial and Professional Regulation (state business registration) plus municipal HVAC licensing (e.g. City of Chicago Department of Buildings) · Company data: verified business records + Google Business profile
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