Reliable Heating & Cooling

We specialize in precision air conditioning installations for residential and commercial properties. Our NATE-certified technicians handle complete system replacements and new installations using Carrier equipment. By assessing your specific cooling requirements and property characteristics, we ensure optimal system sizing and performance. Our installations include proper refrigerant charging, airflow optimization, and smart thermostat integration for maximum efficiency and comfort.

Our heating service division provides comprehensive maintenance and repair solutions for all furnace types. Technicians perform safety checks, combustion analysis, and component testing during routine maintenance visits. Emergency repair services address system failures promptly with diagnostic tools to identify issues. We service legacy systems while offering modernization options that improve efficiency up to 98% AFUE in new installations.

Ductless HVAC solutions cater to homes without existing ductwork and commercial spaces requiring zone control. Our specialists design multi-zone systems with wall-mounted or ceiling cassette units. Installation includes proper line set routing and electrical upgrades while maintaining aesthetic integrity. These systems offer 30% energy savings compared to central systems with individual temperature control for each living or workspace.

We provide traditional tank and tankless water heater replacements with energy-efficient models. Installation includes proper venting, gas line sizing, and temperature regulation compliance. Our service team handles emergency replacements with same-day availability for failed units. We offer hybrid heat pump models that reduce energy costs by 60% while maintaining consistent hot water supply for residential and light commercial applications.

Comprehensive indoor air quality solutions address allergens, bacteria, and particulate matter. Our offerings include HEPA filtration systems, UV air purifiers, and humidity control solutions. Technicians perform air quality assessments using specialized monitoring equipment to identify contaminants. Upgrades integrate with existing HVAC systems to reduce airborne pollutants by 99.98% while maintaining proper ventilation and energy efficiency.

Ken and Marilyn Patterson established Reliable Heating & Cooling in 1972 with a commitment to quality installation and service integrity. Their foundational principles continue guiding the company's operations and customer service standards.

As President and lead technician, Marty Galucia oversees daily operations and complex installations. His technical expertise and customer service focus ensure consistent quality across all service calls and projects.

Service Technician Derrick Hodapp handles emergency repairs and maintenance calls. Customers consistently praise his prompt response, technical knowledge, and professional demeanor during service visits.

Service Manager Ralph Frank coordinates technician schedules and handles complex service requests. His dual role ensures technical excellence combined with efficient service dispatch and customer communication.

Administrative Assistant Sara Nagle manages appointment scheduling and customer communications. Her organizational skills ensure seamless coordination between technicians and clients for all service requirements.

Yes, we provide 24/7 emergency HVAC services for urgent heating and cooling needs with immediate response.

We serve O'Fallon, St. Peters, Lake St. Louis, Wentzville, St. Charles, and surrounding areas in St. Louis County.

Yes, we offer financing options for HVAC system replacements and major repairs to qualified customers.

We combine 50+ years of experience, BBB accreditation, Carrier Factory Authorized status, and 24/7 emergency service with technical expertise.

Call (314) 513-0385 anytime or use our online scheduling system to book appointments during regular business hours.

All service technicians are NATE-certified with ongoing training in the latest HVAC technologies and best practices.

The AC condenser unit's (the outside unit) blower fan was not turning on. Also heard a "hissing noise". It was going be a VERY hot day! I called the number on their website at 7:04 AM on Monday and left a message. Marty returned my call at 7:47 AM to let me know that Derek was going to show up by 9:30 AM. He was here as promised, and he diagnosed that the fan's capacitor had gone bad. The "hissing" noise was the refrigerant high-pressure bypass valve that was activating from overheating as a result of the inoperative fan.

The capacitor was under warranty, so we only paid for the labor. Derek also checked the refrigerant pressure levels. We have been a long-time customer since the1990's, and have known Marty, Ralph, and Derek for several years. They are all terrific to work with! Well earned 5 out of 5 stars! Thank you Derek and Marty!

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.

I am extremely impressed with the customer service and knowledge of technicians Marty and Derek and office administrator Sarah. I've used them many years for seasonal maintenance, prior to using them for my HVAC installation. My AC went out during the hottest week of the year and Marty came out the next day and got it running for me while giving me time to get bids. I called them back 2 days later to schedule them to replace my HVAC system and Marty came out the following day to install a part to get me through the weekend until they could complete the HVAC installation that following Monday.

They went above and beyond to ensure my home was kept cool in the interim, when temps had topped 100 degrees, and were very patient with all of my questions. They were very responsive, kept me updated and showed sincere concern for my needs, as well as having a reasonable price for their system replacement. I will continue to use Reliable for all of my HVAC needs and would recommend them to anyone.

Been using Reliable Heating & Cooling for over 30 years and would not use anyone else for my heating & cooling needs. Great people, great products, and great service. As their name implies, they are Reliable!

We have been customers for 5+ years. Marty has always been very responsive and trustworthy, Sarah a pleasure to talk with when scheduling, and Derrick represents the company very well when servicing HVAC equipment. Thank you!

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!

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.