Hours: We are open 24/7

2183 West Terra Lane, O'fallon, MO 63366

(314) 513-0385

How can we help?

Reliable Heating and Cooling is a family-owned HVAC business with a history of reliability dating back 52 years. As a husband and wife team, we are committed to providing our friends, neighbors and fellow business owners in Florissant, MO, superior service, solutions and satisfaction. We’ve assembled a team of NATE-certified technicians who share our commitment to quality workmanship and exceptional customer care.

Professional Heating & Air Conditioning Solutions You Can Depend On

As a Carrier Factory Authorized Dealer, we’re held to strict criteria of tech training, product knowledge and integrity of business ethics. We excel at our jobs, prioritizing your best interests and always searching for opportunities to maximize system efficiency, capacity, dependability and longevity. From air conditioners and furnaces to heat pumps, water heaters, ductless configurations and indoor air quality add-ons, we take comfort, control and cost-savings to the next level.

Contact us today for your heating & air conditioning repair needs

In need of air conditioner repair? Interested in the many benefits of proactive maintenance for any make or model of heating or cooling equipment? Wondering if it’s time to replace your system? Reliable Heating and Cooling is the HVAC contractor who handles every service to exacting standards. Get in touch, get the right answers and get the assistance you need to better enjoy everyday, no matter what the weather brings.

Central Air Conditioning Service in Florissant, MO | Heating Service

AC Maintenance, Air Conditioning Repair, Heating Installation, Furnace Repair & HVAC Service in Florissant, MO

Central Air Repair in Florissant, MO | HVAC Service

Central Air Conditioning ServiceCentral Air Repair24 Hour AC Service ∴ Florissant, MO

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Customer Reviews
What our customers are saying

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

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

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

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

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