Hours: We are open 24/7

2183 West Terra Lane, O'fallon, MO 63366

(314) 513-0385

How can we help?

For first-time installation and replacement of outdated heating equipment, Reliable Heating and Cooling provides state-of-the-art systems with a proven performance history, offering an extensive range of high-efficiency options.  Our servicemen are NATE-certified, having validated extensive product and service knowledge through intensive industry testing.  We’ve earned recognition as a Carrier Factory Authorized Dealer by consistently meeting strenuous standards of technical expertise and business ethics.  We specialize in “green” products, including gas furnaces, heat pumps, and boilers, protecting both the environment and your wallet.  We combine them with expert sizing and installation to offer a rewarding investment into your comfort.

Professional Heating Installation Throughout O Fallon, MO & surrounding communities

You expect your heating system to maintain perfect temperatures without excessive monthly costs.  At Reliable Heating and Cooling, we demand and deliver much more than that.  Through our partnership with Carrier, we offer design innovations that achieve unmatched efficiency, power, and control.  These intelligent systems automatically adapt output to answer the exact requirements of the home.  By moderating operation in mere, one percent adjustments between forty and one hundred percent capacity, it delivers the ideal amount of heating necessary.  In other words, your system actively works to not only maintain temperatures within a half degree of the thermostat setting, but also minimizes sound levels, wear and tear, and energy use.  And if that’s not enough, we’ll introduce some truly amazing features, such as WiFi enabled control, zoning, energy tracking, maintenance notification, filter change alerts, and customization of temperatures, fan speed, ventilation, air quality, humidity levels, and more!  Our staff of licensed technicians are well-versed in the complexities of heating technology, and offer helpful explanations and recommendations, guiding you through every step of the process.

Stay safe and warm with expert heating installation service from Reliable Heating and Cooling!

Heating your home is a necessary but major commitment.  That doesn’t mean it should be something you need to worry about every day.  By finding the perfect match for your unique requirements and completing skilled installation, Reliable Heating and Cooling delivers reliable and exceptional comfort.  We’ve installed, upgraded, and serviced HVAC equipment in homes across O Fallon, Saint Peters, Lake Saint Louis, Wentzville, and Saint Charles, MO since 1972.  We know exactly what it takes to effectively combat the severe weather conditions.  Our team of specialists handle your beginning-to-end project with care and dedication, meeting a strict timetable, staying on budget, and maintaining a professional job site.  Turnkey solutions include comprehensive system checks and familiarization with the features and operation of your new system. Count on Reliable Heating and Cooling to create a wonderfully warm home for you and your family this winter, letting you take your comfort for granted year after year.  We are the name you can trust.

Heating Installation O Fallon, MO | Heating Replacement Saint Peters, MO | Furnace Installation Services Lake Saint Louis, MO

At Reliable Heating and Cooling We Offer a Variety of HVAC Services:
Heating Repair
Heating Service
Air Conditioning Service
Air Conditioning Repair
Air Conditioning Installation

Furnace Installation, Heater Installation, Heating Replacement, Heating Replacement & Furnace Replacement O Fallon, MO, Saint Peters, MO, Lake Saint Louis, MO, Wentzville, MO & Saint Charles, MO

Heating System Installation O Fallon, MO | Furnace Installation Saint Peters, MO | Furnace Installation Services Lake Saint Louis, MO

Heating InstallationHVAC InstallationHeating System InstallationFurnace Installation Services ∴ Saint Charles, MO ∴ Saint Peters, MO ∴ Lake Saint Louis, MO

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Customer Reviews
What our customers are saying

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

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

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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