Hours: We are open 24/7

2183 West Terra Lane, O'fallon, MO 63366

(314) 513-0385

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Whether your air conditioner is brand new or nearing the end of service life, annual maintenance should be a top priority on your spring to-do list.  No matter the age, make, or model, neglected cooling equipment leads to a steady decline in performance, efficiency, and reliability.  And for all of those reasons you may be tempted to procrastinate, Reliable Heating and Cooling has the perfect solution.  We work with you to set up a level of maintenance and appointment times you’re comfortable with.  Whether you’d prefer to enroll in a service agreement, or take it one season at a time, we’ll accommodate you.  Our NATE- and ACCA-certified technicians arrive promptly, complete all work neatly, and leave you with nothing to do but enjoy the numerous benefits.  It couldn’t be easier, more affordable, or more rewarding.  We make sure of it.

Air Conditioning Maintenance Services

A professionally cleaned, tuned, and adjusted cooling system can be trusted to perform at peak efficiency and capacity.  Things like leaking refrigerant, dirty air filters, blocked condensers, clogged condensate drains, and more, are quickly identified, corrected, and prevented from compromising operation.  If minor issues are not addressed, you’ll notice a gradual increase in noise levels, humidity, airborne contaminants, and running costs, even while comfort levels steadily drop.  Just the simple task of replacing a clogged air filter with a clean one can trim energy use by 15%.  Let the specialists from Reliable Heating and Cooling optimize your system.  We’ll save you money on those volatile energy bills, head off costly repairs, and extend service life.  We’ll ensure proper filtration, superior air quality, and a cleaner, healthier, more enjoyable home environment.

Call Reliable Heating and Cooling for regular air conditioner service in and keep your home cool and comfortable!
O Fallon, Saint Peters, Lake Saint Louis, Wentzville, and Saint Charles, MO

As a Carrier Factory Authorized Dealer, Reliable Heating and Cooling completes a thorough list of proven services designed to restore your equipment to peak operation.  If any replacement parts are necessary, we’ll reach first for genuine Factory Authorized Parts.  Professional AC Maintenance has been shown to prevent over 50% of potential repair needs, making good financial sense.  Call us for seasonal service in O Fallon, Saint Peters, Lake Saint Louis, Wentzville, and Saint Charles, MO, and choose a plan that meets your specific needs.  We offer a variety of options, and each one can be customized to add air quality accessories.  With service from Reliable Heating and Cooling, you can be sure that when you need your air conditioner the most, it will meet your demands.  We are a name you can trust. We over a variety of services including heat pumps, indoor air quality, and much more!


Reasons to Service Your Air Conditioner

Is your air conditioner not performing how it should? Reliable Heating and Cooling is here to help you diagnose and service your AC Unit! Here are some reasons to service your air conditioner.

Improving Performance: Having your air conditioner serviced regularly can help improve performance and lead to less issues down the road.

Increased Longevity: Regular ac service can increase longevity of your air conditioner and improve overall performance.

Save Money Over Time: When you regularly service your air conditioner, you will save money because you will be on top of any problems that may occur, and can fix them promptly.

AC Repair Services in O Fallon, MO | Air Conditioning Service Saint Peters, MO

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

AC Repair Services in O Fallon, MO | AC Service Saint Peters, MO

Air Conditioner ServiceAC Repair Services ∴ O Fallon, MO ∴ Wentzville, MO ∴ Saint Charles, 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

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

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

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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