Hours: We are open 24/7

2183 West Terra Lane, O'fallon, MO 63366

(314) 513-0385

How can we help?

Reliable is pleased to offer you more options and benefits by allowing you to choose a plan that meets your specific needs. Our Good, Better, Best, and Fantastic plans offer a wide variety of benefits and discounts, and all of the plans can be customized to add humidifiers, air cleaners, or any other system accessory. Plans start as low as $12 per month.

A “Diamond Plan” maintenance agreement gives you more choices, including:

  • Low Monthly Payments
  • Longer warranties
  • Replacement Purchase Accrual
  • Saturday Maintenance
  • No Emergency Service Rates
  • Same Day Service

Getting started is easy.

Our friendly staff will gladly answer any questions, and assist you in choosing a plan.

Program Benefits Better Best Fantastic
*The New “Diamond Plan” Maintenance Program options from Reliable give you more choices, and our new monthly billing fits easily into most budgets.
Performance System Tune-Up* 2-trips 2-trips 2-trips
Reminder Service
Repair Warranty 1 year 2 years 3 years
1″ Pleated Filter Change Per Visit
Priority Service
Pre-Season Scheduling
Discount on Repairs 10% 20% 20%
Equipment Replacement Discount 5% 7%
Water Heater Maintenance ($75)
Saturday Maintenance Calls
Change Batteries In T-Stat
Same Day Service
Extra Filter Each Trip (1″ Pleated)
No Emergency Service Charges
Investment $209 $259 $319
Monthly Investment $18 $22 $27

HVAC Preventative Maintenance, Air Conditioning Service Plans, Central Air Tune-Ups & Heating Service Plans O Fallon, MO, Saint Peters, MO, Lake Saint Louis, MO, Wentzville, MO & Saint Charles, MO

HVAC Preventative Maintenance in O Fallon, MO | Heating Service Plans Saint Peters, MO | Air Conditioning Service Plans Lake Saint Louis, MO

HVAC Preventative MaintenanceCentral Air Tune-UpsHeating Service PlansAir Conditioning Service Plans ∴ O Fallon, MO ∴ Lake Saint Louis, MO ∴ Saint Peters, MO

Company Logo 1
Company Logo 2
Company Logo 3
Company Logo 4
Company Logo 5
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.


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

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

Winfield, MO

Moscow Mills, MO

Cottleville, MO

Chesterfield, MO