Hours: We are open 24/7

2183 West Terra Lane, O'fallon, MO 63366

(314) 513-0385

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Heating and Cooling Services in St Charles

Hot and muggy summers in St. Charles quickly lead to long, freezing cold and snowy winters. The majority of your time is spent indoors. Heating and cooling are not only necessities but directly affect health, productivity and sleep patterns. From comfort to environmental impact and expenses, Reliable Heating and Cooling is here to provide simple and satisfying solutions to year round challenges. We are your trusted HVAC contractor for residential and commercial needs.

Reliable Heating and Cooling has handled expert heating/cooling system installation, cost-effective replacements, complex repairs and seasonal tune-ups of all makes and models for 52 years. Nothing surprises us. Our NATE-certified professionals arrive at your door prepared to achieve your goals swiftly, smoothly and successfully. We simply don’t accept anything less than total satisfaction from our job performance.

Your Certified HVAC Professionals

As a Carrier Factory Authorized Dealer, the team from Reliable Heating and Cooling is extensively trained in the leading heating, cooling, ventilation and indoor air quality technology, opening up unmatched opportunities. Through modern innovation we save you time, money and hassle while ensuring consistent comfort. Don’t settle. Get in touch with us today! We’re always here to deliver ideal solutions, including 24/7 emergency services anywhere across St. Charles and West St. Louis Counties.

AC Repair, HVAC Service, Heating Maintenance, Heating Service & AC Service in St Charles, MO

Heating Service in St Charles, MO | AC Repair

Heating RepairAC ServiceAC MaintenanceHVAC ServiceAC Repair ∴ St Charles, MO

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Customer Reviews
What our customers are saying

We had a emergency water leak problem with our AC unit in the basement of our recently purchased condo. Called Reliable and Derrick was there within a couple of hours. He was polite, knowledgeable, and friendly. Derrick quickly found the problem and repaired it. He also checked the system overall, pointed our some concerns and answered all my questions. I can’t say enough about how satisfied we were with Derrick and Reliable Heating & Cooling! We would definitely recommend them!!! Thanks again!!!!

Terry Mills

I had a system malfunction on Sunday evening December 12, 2022 on my Carrier Infinity ICS purchased in 2008.I am a first time caller to Reliable. Marty called me back and had his Tech dispatched at 8 AM the next day. The unit had failed and was dangerous to use. He had a new system by the next morning. They installed it and I was completely satisfied with their service and response time. I overwhelmingly recommend Reliable and will be using them from now on.


Have been with them for more than 10 years. They provide exceptional service…from the time they call to remind you about setting an appointment to the actual service day. Derek (and all their other technicians) are knowledgeable, professional, prompt, and open to listening to questions and pay attention to details. Never had a problem with anything. Thank you for a job well done. Good pricing.

Seema Chouhan

We have used Reliable Heating and cooling for all of our heating and cooling needs. We needed some water heater work and Ralph came out and took care of it right away. Ralph was very professional and knowledgeable. He got the job done very quickly and everything is working great! I always recommend Reliable to family and friends. They truly are Reliable!

Chris Lopez

Had a small gas leak for a property I was helping a friend sell and we found out late last night. We reached out to Reliable H&C and Derrick was over first thing in the morning. He was friendly, professional and knowledgeable. He answered my questions with a smile. Derrick was a rock star. Will absolutely call him again. Bravo

Connor Kapp

Reliable has installed and maintained our last 2 furnaces and AC. Our experience with them has been great. Just yesterday we had an issue with our AC. I talked to Marty and he said he’d have someone out the next day. They even were able to accommodate us with an afternoon call. Derrick arrived promptly on time and had us up and going again in 15 minutes (bad capacitor on the condenser unit fan motor). With the prediction of high 90 temps, we were so thankful to have AC working again.

Keith Scherer

Cottleville, MO

Winfield, MO

Moscow Mills, MO

Chesterfield, MO