Hours: We are open 24/7

2183 West Terra Lane, O'fallon, MO 63366

(314) 513-0385

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Modern heat pumps answer your need for heating, ventilation, and cooling in one convenient, efficient, and reliable system.  You’ll enjoy benefits such as safe operation, clean, healthy air quality, and minimal monthly costs and maintenance. When you call on Reliable Heating and Cooling for quality products, precision installation, and skilled service in O Fallon, MO & surrounding communities, you enjoy maximum return from your investment.  As a Carrier Factory Authorized Dealer, we specialize in award-winning heat pumps that will elevate your expectations for indoor comfort.

Heat Pump Systems

Carrier Infinity Series heat pumps with Greenspeed intelligence bring together innovative, adaptable-speed technology with the smarts of Infinity control.  The result is a system that reacts to variations in indoor conditions by slowing down and speeding up in mere one percent increments between forty and one hundred percent capacity.  By supplying only the perfect amount of heating and cooling to meet demands, the heat pump actively conserves energy, and maintains temperatures within a degree of the thermostat setting.

Contact Reliable Heating and Cooling for heat pump repairs, service, and installations!
O Fallon, Saint Peters, Lake Saint Louis, Wentzville, and Saint Charles, MO

Reliable Heating and Cooling matches your household or commercial requirements to the ideal system.  Through proper sizing and installation, we make sure you benefit from outstanding dehumidification in cooling mode, and avoid overly dry air in heating mode. We offer a range of exciting features, including zoned control and customization of everything from temperature, to fan speed, ventilation, air quality, and humidity.  And with WiFi enabled units, you can manage every facet of your system from your smartphone, computer, or tablet.  All Infinity heat pumps can be part of a Hybrid Heat dual fuel system, for year-round comfort and cost-savings.  Contact the skilled heat pump specialists from Reliable Heating and Cooling, and experience a whole new level of satisfaction.  For heat pump installation, replacement, seasonal maintenance, repair, and 24/7 Emergency Service across O Fallon, Saint Peters, Lake Saint Louis, Wentzville, and Saint Charles, MO, Reliable Heating and Cooling is a name you can trust.

Inflation Reduction Act Frequently Asked Questions

Heat Pump Service in O Fallon, MO | Heat Pump Installation Saint Peters, MO

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

Heat Pump Repair, Heat Pump Installation Near Me, Heat Pump Replacement & Heat Pump Installation O Fallon, MO, Saint Peters, MO, Lake Saint Louis, MO, Wentzville, MO & Saint Charles, MO

Heat Pump Maintenance in O Fallon, MO | Heat Pump Installation Saint Peters, MO

Heat Pump MaintenanceHeat Pump Service ∴ Lake Saint Louis, MO ∴ O Fallon, MO ∴ Wentzville, MO

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Customer Reviews
What our customers are saying

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

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

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

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