Hours: We are open 24/7

2183 West Terra Lane, O'fallon, MO 63366

(314) 513-0385

How can we help?

In Maryland Heights, the summers are hot and sticky and the winters are extremely cold and snowy. The temperature regularly swings from the high eighties down into the teens. The cost of heating and cooling typically adds up to around 50% of household or commercial energy consumption, making energy efficiency especially important. To enjoy ideal comfort, no matter what the weather brings and without draining your bank account, reach out to the professionals at Reliable Heating and Cooling.

Dependable Heating & Air Conditioning Service in Maryland Heights, MO

We are a family-owned HVAC provider started in 1972. Our experience counts. We’re familiar with the ins and outs of all makes, models and ages of every style of heating and cooling equipment. The recommendations of our NATE-certified technicians can be trusted to achieve the most cost-effective and satisfying outcome. Call on us at (314) 513-0385 for new construction design/installation, replacements, repairs and seasonal maintenance and maximize the opportunity and rewards of your investment.

Contact us for heating and cooling installation, service, and repairs

Our recognition as a Carrier Factory Authorized Dealer opens up an exciting array of smart technology. Exceptional efficiency ratings, state-of-the-art features, ease-of-control, outstanding warranties and an option to suit every demand is waiting for you at Reliable Heating and Cooling. From air conditioners, furnaces and heat pumps to ductless systems, water heaters and IAQ accessories, we exceed expectations for our customers in Maryland Heights.

24 Hour AC Service in Maryland Heights, MO | Furnace Repair

Heating Service, AC Service, Furnace Repair, HVAC Service & Air Conditioning Repair in Maryland Heights, MO

Central Air Repair in Maryland Heights, MO | Air Conditioning Repair

24 Hour AC ServiceCentral Air Conditioning ServiceCentral Air Repair ∴ Maryland Heights, MO

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Customer Reviews
What our customers are saying

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

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.


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

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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