Hours: We are open 24/7

2183 West Terra Lane, O'fallon, MO 63366

(314) 513-0385

How can we help?

If you’d like to enjoy the benefits of a perfectly comfortable home without the mess and expense of installing ductwork, Reliable Heating and Cooling has the perfect solution.  If you’re tired of hauling around portable air conditioners or tripping over space heaters, Reliable Heating and Cooling answers with permanently installed mini- and multi-split systems that meet your highest demands for efficiency, quiet operation, and precision temperature control.  Our NATE-certified technicians work with you to properly recommend, size, and implement a system that solves the toughest comfort challenge.  There’s little more required than a three-inch hole in an exterior wall, no mess, and most installations can be completed in a single visit.

Ductless Split Systems

Reliable Heating and Cooling is a Carrier Factory Authorized Dealer.  Our technicians are factory trained and regularly updated in product and technological advancements.  By bringing you the leading systems available on the market today, we ensure greater reliability, capacity, efficiency, and overall satisfaction.  We enable you to improve the comfort in a single room or target multiple rooms.  With zoned conditioning you customize comfort to your preferences, avoid energy waste in unoccupied rooms, and eliminate the cross-contamination of conditioned air.  With a handy remote, you can quickly raise or lower temperature, switch from heating to cooling, and make adjustments from anywhere in the room.  Compact, lightweight, and quiet, ductless split systems are an attractive, simple, and effective solution to temperature control.

For expert ductless HVAC repairs, service, and installations, call Reliable Heating and Cooling today!
O Fallon, Saint Peters, Lake Saint Louis, Wentzville, and Saint Charles, MO

The skilled technicians from Reliable Heating and Cooling perfectly size, locate, and install the indoor and outdoor units for superior rewards.  We handle the entire process with skill and care, making sure your needs are met quickly and to your complete satisfaction. At Reliable Heating and Cooling we offer a variety of services from heat pumps, to indoor air quality. For all aspects of ductless HVAC service, contact the professionals Reliable Heating and Cooling  We are the name you can trust.

Ductless Heating in O Fallon, MO | Ductless HVAC Saint Peters, MO

Ductless HVAC, Ductless Split Installation & Ductless Mini Split O Fallon, MO, Saint Peters, MO, Lake Saint Louis, MO, Wentzville, MO & Saint Charles, MO

Ductless Heating in O Fallon, MO | Ductless HVAC Saint Peters, MO

Ductless HeatingDuctless Air Conditioning ∴ Saint Peters, MO ∴ Wentzville, MO ∴ O Fallon, 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.


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

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

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

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

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