Hours: We are open 24/7

2183 West Terra Lane, O'fallon, MO 63366

(314) 513-0385

How can we help?

commercial-hvac-serviceReliable Heating and Cooling specializes in commercial HVAC systems and services, combining top quality products with skilled workmanship to protect the comfort, health, safety, productivity, and smooth operation of your business.  For everything from light to industrial commercial installation, replacement, seasonal maintenance, and repair, Reliable Heating and Cooling caters to the specific needs of our customers across O Fallon, MO & surrounding communities.  Our ACCA- and NATE-certified team of service technicians are available 24 hours a day, 7 days a week to respond to any heating or cooling emergency, minimizing disruption and downtime, and ensuring a quick return to peak capacity.  There is no commercial comfort challenge we can’t handle, and through a wide range of proven equipment and strategies, we effectively reduce costs, enhance efficiency, and deliver precise control over your indoor climate.  From temperature control to air quality and water heating, call on Reliable Heating and Cooling for straightforward, sustainable solutions.

Commercial HVAC Installation & Service

Our fully licensed and insured technicians are factory trained at the highest level and receive regular technical updates.  Consider Reliable Heating and Cooling your team of support, bringing swift, skilled attention to each project, and handling every facet with unwavering professionalism.   At Reliable Heating and Cooling, we recognize that the well-being of your staff and customers, as well as the condition of your facility and any sensitive materials, is directly impacted by the reliability and performance of your HVAC system.  As a Carrier Factory Authorized Dealer, we not only provide the most sophisticated solutions to temperature control on the market today, our technicians are proficient in the design/build, installation, and replacement of equipment.  We accurately meet your current requirements and anticipate future growth to deliver long-term rewards and value from your investment.  A comprehensive selection of “green” energy efficient options allows you to both protect our environment and your budget.

Through a preventative maintenance agreement, tailored to the exact needs of your specific heating, cooling, and air quality components, Reliable Heating and Cooling greatly reduces the risk of sudden disruption, property damage, and system failure.  Professional cleaning, troubleshooting, and adjustment safeguards essential equipment.  Let us optimize safety, restore sound levels, maximize efficiency, extend service life, and much more, with quick, affordable upkeep of your commercial HVAC systems.  If you should experience any concerns or problems with any brand or model of equipment, don’t hesitate to call your local experts from Reliable Heating and Cooling.  Convenient scheduling and 24/7 Emergency Service is always available.

Contact Reliable Heating and Cooling for reliable commercial heating and cooling system repairs, maintenance, and installations!
O Fallon, Saint Peters, Lake Saint Louis, Wentzville, and Saint Charles, MO

It’s our goal to fulfill all of your commercial temperature control needs throughout your years of business.  Reliable Heating and Cooling builds lasting relationships with a commitment to excellence in every service and product we provide.  When you count on Reliable Heating and Cooling for your commercial heating, cooling, air quality, and hot water requirements, we earn your complete satisfaction through prompt arrival, conscientious job site management, courteous service, proficient workmanship, and a long list of benefits that add up to a better way of doing business.  Established in 1972, Reliable Heating and Cooling is a name you can trust.

Industrial HVAC in O Fallon, MO | Commercial Heating Saint Peters, MO

Commercial HVAC, Commercial Heating, Commercial HVAC Near Me & Commercial Air Conditioning O Fallon, MO, Saint Peters, MO, Lake Saint Louis, MO, Wentzville, MO & Saint Charles, MO

Roof Top Units in O Fallon, MO | Commercial HVAC Near Me Saint Peters, MO

Roof Top UnitsIndustrial HVAC ∴ Saint Peters, MO ∴ Wentzville, MO ∴ Saint Charles, 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.


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

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 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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