Janssen Heating Cooling Plumbing & Insulation
HVAC contractor in East Alton, IL.
In Janssen Heating Cooling Plumbing & Insulation's own words
Your local company for all things HVAC, insulation, and plumbing! Serving the Alton area with dedication, we pride ourselves on offering services that are not only cheaper than our competitors but also fairly priced. With Janssen Heating and Cooling, you get competitive pricing without compromising on quality. Choose us for reliable, cost-effective solutions for your home.
- Trade
- HVAC contractor
- Business address
- 2 Terminal Dr, East Alton, IL 62024, USA
- Telephone
- (618) 541-2415
- Website
- janssenheatingandcooling.com
- Hours
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- Monday8:00 am - 6:00 pm
- Tuesday8:00 am - 6:00 pm
- Wednesday8:00 am - 6:00 pm
- Thursday8:00 am - 6:00 pm
- Friday8:00 am - 6:00 pm
- Saturday9:00 am - 12:00 pm
From Google, checked May 2026
- Register
- IL register
Recorded as supplied and as found in public sources. This register makes no credential or quality claim about any business; check license status with the state board.
Google Reviews
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Knowledgeable, friendly, terrific pricing and incredibly responsive. Mr. Janssen waa able to help me twice in a week for three issues that came up while preparing my house for sale. I have enthusiastically recommended him to my fellow workers, friends and will continue to call upon his services as needed.
mrgrinch13
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Absolute perfection from start to finish. We had a stressful utility issue today, and the technician who arrived handled it with the utmost professionalism, precision, and care. He quickly diagnosed the problem, explained the resolution clearly, and executed the repair flawlessly. His technical expertise is matched only by his stellar customer service. It’s incredibly rare to find someone this reliable, intelligent, and dedicated to their craft. If you want the job done safely and correctly the first time, this is the professional you want on the job. Highest possible recommendation! ⭐⭐⭐⭐⭐
Shanna K.
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Steve came out promptly after our AC was giving us issues during a heat wave. He was quick to diagnose and fix the issue and was very professional. Would recommend to friends and family!
Sugar C.
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Steve came out to my house to fix sewer back up after hours and dealt with the problematic plumbing in my house efficiently at a very fair rate. Will use him again for any future needs.
Connor H.
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Our AC recently went out and I called Janssen heating and cooling. I was impressed how quickly he arrived. We had a very old ac unit that quit working. Steve diagnosed the problems and pointed them out to us he gave us some options on what to do, we chose to upgrade our ac, and glad we chose him to do it. He takes such pride in his work, pays attention to detail, and doesn't cut corners. He is very expierenced and knowledgeable in his field. We highly recommend Janssen Heating and Cooling! Thank You Steve for a job well done!
Eric
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Steve is great! He thorough, finishes the job whatever the problem arises. We had several issues with our HVAC from the previous "owners" neglect. Our ducts were to small. They needed to be replaced and the return need to be larger. He came up with solutions that were, manageable with our budget and our time. Very thankful. In addition we have Bethalto water and had enough! We wanted to install a whole house filter water, softener and reverse osmosis for drinking. He was knowledgeable all processes and guided us. And what a difference! No color in the water, no more cleaning everyday and my water taste really good. I love it. I would recommend Janssen Heating Cooling Plumbing & Insulation to anyone who want personal insightful thoughtful care for their home. Tonya
Tonya H.
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Came out cleaned my extremely old system and was very honest. We talked about the old system without him trying to tell me I needed to replace it. Pricing and service were definitely a 10.
Josh B.
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Steve was absolutely phenomenal. Originally called another company who had installed my new HVAC system and was deemed a non emergency and my scheduled appointment was pushed out 2 days. Called Steve and told him how uncomfortable the noice coming from my furnace room was making me feel. He arrived to my house within 20 minutes and discovered a burst pipe in the crawl space right underneath the HVAC system. He was quick and efficient with the service and we are back up and running!
Evelynn F.
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I really appreciated all of the time and effort given to help keep my old ac and air handler running for hopefully a bit longer. I am not financially prepared to buy an entirely new unit right now. But when I do, I’ll be calling you back for sure! Thank you, thank you, thank you😊
Christine E.
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Steven came out diagnosed our problem very quickly(Sunday). The following day (Monday) came out with the parts and fixed the issue in a timely manner. Very personable and very responsive customer service. Answered all questions and even tolerated our yapping dog, all with a smile. We will definitely be saving his information for all future needs.
Erica W.
About Janssen Heating Cooling Plumbing & Insulation
Janssen Heating Cooling Plumbing & Insulation handles HVAC work alongside insulation and plumbing. The company describes its work as home-service support for the Alton area, with pricing positioned as competitive and fair.
HVAC, insulation and plumbing work in East Alton
Its stated service mix puts heating and cooling equipment beside insulation and plumbing rather than treating them as separate trades. Reviews describe calls involving air-conditioner failures, furnace-area issues, old systems, duct sizing, sewer backups, water treatment equipment, and window-unit cleaning.
Customers most often mention quick responses, prompt diagnosis, clear explanations, and pricing. They also describe repair options for aging equipment, replacement work, duct changes, plumbing repairs, and attention to the condition of existing systems.
Hours and customer ratings
Its published hours run from 8:00 am to 6:00 pm on weekdays, with Saturday hours from 9:00 am to 12:00 pm.
In East Alton, 66% of housing units use utility gas for heat, per the American Community Survey in 2024. NOAA normals for 1991-2020 give the city an average temperature of 55.7°F, an average high of 65.0°F, and an average low of 46.4°F.
Repair choices for older home systems
Reviewers describe the company working to keep older air-conditioning equipment and air handlers running, while also discussing replacement when needed. One recurring account is that the work is explained before a repair or upgrade decision is made, including options shaped around a household's budget and timing.
The company also receives review comments about after-hours plumbing response, crawl-space pipe problems, water softeners, reverse-osmosis drinking-water systems, and whole-house filtration. That combination makes plumbing and water-related work part of the business's reported scope alongside heating, cooling, and insulation.
Services, brands and warranty details come from the company's own website. Ratings, hours and reviews come from Google. Town figures come from the US Census and NOAA.