Hours: We are open 24/7

2183 West Terra Lane, O'fallon, MO 63366

(314) 513-0385

How can we help?

Reliable Heating & Cooling is proud to serve the O’Fallon community!

We are proud to be part of this community, serving your heating and air conditioning needs. Whether you need repair, replacement or a new installation of a furnace, air conditioner, heat pump or air filtration system, we get the job right the first time. Our certified technicians service all make and models.

Please call us today at 314-513-0385 to consult with our home comfort specialist.

We offer the following HVAC Services in O’Fallon:

About O’Fallon, MO – Happy to be your hometown Heating & Air Conditioning Contractor!

As the largest municipality in St. Charles County, O’Fallon is the 7th largest city in the State of Missouri. It is located along Interstates 64 and 70, making it easily accessible to neighboring communities of St. Peters and Lake St. Louis. This community has been ranked by Money Magazine as one of the top 100 places to live in the U.S. O’Fallon is known for having four distinct seasons, and average precipitation is around 41 inches. Temperatures of both 100 degrees Fahrenheit and 0 degrees Fahrenheit can both be experienced throughout the year.

As one of the largest communities in the region, O’Fallon has a lot of things to see and do. The city is home to the River City Rascals baseball team, and they play at T.R. Hughes Ballpark. There are also several parks and recreational opportunities available, including Civic Park, which features Alligator’s Creek Aquatic Center. Golf is also a highlight of this region, and one of the most popular area courses is The Links of Dardene.

Air Conditioning Repair in O'Fallon, MO | HVAC Service

AC Maintenance, HVAC Service, Heating Service, Heating Installation & Air Conditioning Repair in O'Fallon, MO

Heating Service in O'Fallon, MO | Air Conditioning Repair

AC MaintenanceAC ServiceFurnace RepairHeating InstallationHeating Service ∴ O'Fallon, MO

Company Logo 1
Company Logo 2
Company Logo 3
Company Logo 4
Company Logo 5
Customer Reviews
What our customers are saying

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

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.


Moscow Mills, MO

Chesterfield, MO

Cottleville, MO

Winfield, MO