Hours: We are open 24/7

2183 West Terra Lane, O'fallon, MO 63366

(314) 513-0385

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AC Repair Services for O Fallon, MO & surrounding communities

Problems with air conditioning always seem to happen when you need it most, on the hottest day of the year, when equipment is working its hardest.  Whether it’s the middle of a holiday weekend, or the middle of the night, you don’t need to suffer the consequences until Monday morning.  Reliable Heating and Cooling protects the cool comfort of our customers 24 hours a day, 7 days a week, 365 days a year.  Call us for Emergency Service, anywhere in O Fallon, MO & surrounding communities or the surrounding areas, and rest assured, our NATE-certified professionals provide prompt, honest, and expert service.

Repair Services For Your AC System

Reliable Heating and Cooling is a Carrier Factory Authorized Dealer.  This hard-earned distinction translates into a team of technicians who are factory trained at the most exacting level and continually updated in the latest techniques and technology.  We draw from extensive industry background, follow proven procedures, and utilize state-of-the art diagnostic tools.  Rest assured, Reliable Heating and Cooling is equipped to handle any job, from minor issues with performance to complete system failure.  We service all makes and models, regardless of age, size or condition, and do our very best to complete the entire job in a single service call.  We respect your property, taking care to cause no damage and clean up any debris or discarded equipment.

Don’t delay necessary AC repairs!
O Fallon, Saint Peters, Lake Saint Louis, Wentzville, and Saint Charles, MO

Established in 1972, our customers stick with us, season after season, for reliable and long-term solutions to indoor comfort.  We protect your ongoing satisfaction with repairs that meet your expectations for durability, sound levels, efficiency, and cooling capacity.  Our prices are competitive, our service exceptional, and each and every member of the Reliable Heating and Cooling team is dedicated to earning your satisfaction.  Whether your best investment is to repair or to replace, we provide the information and recommendations you need to make smart choices and achieve rewarding results.  By combining innovative ideas with integrity, experience, and knowledge, we handle even the toughest jobs with ease.  For AC repair across O Fallon, Saint Peters, Lake Saint Louis, Wentzville, and Saint Charles, MO, Reliable Heating and Cooling is the name you can trust.

Trust the Team of Professionals for Your AC Repair

Are you in need of AC repair services in O Fallon, MO & surrounding communities? Look no further than Reliable Heating and Cooling! Our team of certified professionals is here to help you with all your AC repair needs. We can work with you to customize a solution that fits your specific needs. Besides AC repair, we offer heat pumps, ductless HVAC, indoor air quality, heating services and much more. Give Reliable Heating and Cooling a call today!

HVAC Repair O Fallon, MO | AC Repair Saint Peters, MO | Central Air Conditioning Repair Lake Saint Louis, MO

Air Conditioning Repair, AC Repair Near Me, Air Conditioner Repair & AC Repair O Fallon, MO, Saint Peters, MO, Lake Saint Louis, MO, Wentzville, MO & Saint Charles, MO

Central AC Repair O Fallon, MO | AC Repair Saint Peters, MO | Central Air Conditioning Repair Lake Saint Louis, MO

Central Air Conditioning RepairCentral AC RepairHVAC Repair ∴ O Fallon, MO ∴ Lake Saint Louis, MO ∴ Saint Peters, 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

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

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

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.


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

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

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