HVAC Installation & Repair in Lake St. Louis

Experience the best of Midwest living in Lake St. Louis, where each season brings its own charm. From lush, rainy springs to hot, sunny summers, and mild autumns with beautiful foliage, we've got it all. But when winter rolls in with its unpredictable weather and temperature swings, you'll want a reliable HVAC system. That's where we come in, ready to help with top-notch service!

Heating Repairs in Lake St. Louis, MO: Your Comfort is Our Priority

As November approaches, so does the chill of winter. In Lake St. Louis, MO, a functioning heating system isn't just a luxury—it's a necessity. At One Hour Heating & Air Conditioning® of Lake St. Louis, we understand how easy it is to forget about HVAC maintenance while you're enjoying those crisp fall breezes through your open windows. But don't worry, we've got your back!

We pride ourselves on offering the finest heating repair services in Lake St. Louis, MO. Our team knows that heaters don't follow a 9-to-5 schedule. Whether it's the dead of night in sub-zero temperatures, during your workday, or just as you step out of a warm shower, we're ready to respond. Our professional, highly-trained technicians are available 24/7 to provide the heating relief you need. No job is too big or too small—our goal is to keep you cozy in your Lake St. Louis home, no matter what.

Lake St. Louis' Premier Heating & Air Conditioning Repair

At One Hour Heating & Air Conditioning® of Lake St. Louis, our reputation is our pride. We've built our business on unparalleled customer service and overall experience. Our promise? "Always on time, or you don't pay a dime." We understand that while your HVAC system in Lake St. Louis might need repairs, you could be tied up at work in St. Louis. That's why we respect your time, sticking to our appointment schedules to keep your day as normal as possible. Our aim is to solve your HVAC issues without adding unnecessary stress to an already challenging situation.

24/7 HVAC Service in Lake St. Louis, MO: We're Just a Call Away

Don't hesitate to reach out the moment you notice an issue with your home's HVAC system. We'll be there in a flash to provide relief. As an added bonus, your service call is free with repairs. Contact our Customer Service team now for more information or to schedule your appointment. Worried it's too late to call? Don't be! We provide round-the-clock emergency service to ensure your comfort, no matter the hour.

Lake St. Louis residents, your comfort is just one call away. Let us show you why we're the most trusted name in HVAC services in the area!

We Have a Reputation

For Being Punctual, Friendly and Knowledgeable

4.84

(166825 reviews)

Norma Del Rio

in the last week

“I would like to share a truly wonderful experience I had with a technician who came to service our air conditioning. His name is Seth, and he made such a positive impact on us during his visit. He was not only professional but also incredibly friendly and knowledgeable. His excellent people skills really stood out, and he made us feel comfortable throughout the entire process. Thanks to the outstanding service we received from Seth, we felt assured that we were in good hands with the company, so we decided to sign up for the VIP program. We want to extend our heartfelt appreciation to Seth for his exceptional work. We hope others will recognize his efforts as well. Warm regards, The Del Rio Family Bonita, California”

Stacy Mottola

in the last week

“Mike was awesome. He made the repair quickly and efficiently. He was able to repair the existing wire without having to spend a lot of time with a replacement. Will definitely call on one hour for any future needs.”

Britney Calderon

in the last week

“I had angel come out to my rental property looked over why my ac was leaking and not cooling the second floor turns out I had the wrong unit for my ac he was very thorough and informative about the steps that would need to be taken made sure to answer all of my questions and concerns. He made the experience easy and had a great attitude. Definitely recommend this technician and company”

Denice Ransom

in the last week

“Elian and his trainee Angel arrived within the timeframe I was given. They both were courteous, professional and knowledgeable. They took the time to explain what a maintenance check entailed. All questions that I had were answered to my satisfaction. The level of service was excellent. I would highly recommend One Hour Air Conditioning and Heating to anyone looking for quality work done by experienced technicians. Very Satisfied Customer:)”

Lisa Barnard

in the last week

“My husband and I bought our first ever home this year. We are so thankful to have found our go to team for heating and cooling! Tim went above and beyond to fix our AC yesterday. He was so knowledgeable, efficient, and kind. The dispatch took the time to really listen and were so caring; they were also able to have Tim come that day to ensure it would be fixed with this summer heat. Highly recommend them!”

Jay Giuffrida

in the last week

“James Landry was at my house today to analyze and take pics of my A/C. He was courteous and very professional. He explained things to me in a way that I understood. You should have more people like him in your organization. I was very happy after speaking with him because I knew what I had to do after that (get a new A/C). Thank you for sending James.”

Joseph Everett

in the last week

“I was completely impressed by the professionalism displayed by Miguel. He first let me know that all questions during installation were welcome. He assessed the project and determined new lines needed to be installed to get maximum efficiency from the AC unit. He rerouted the wiring but got my permission before doing so. He worked diligently and thoroughly cleaned the work area after completion. Service, in a nutshell, was outstanding.”

Carl Robertson

in the last week

“My experience with Gilmer Rojas was Exceptional!! Arrived early! Explained everything detail of his work Made some practical recommendations! He was a very knowledgeable technician! I would highly recommend One Hour services to all my family n friends Thank you!”

Crystal Moreno

in the last week

“Amazing company. Jamie was very knowledgeable and informative after his inspection. He was able to provide me with great details on all the issues as well as answer all my questions. They are very competitive and offered great financing. I definitely recommend this company if you are looking for any AC Unit services.”

James E

in the last week

“Joe was fantastic! He came out to check on our AC and not only fixed the issue, but walked me through everything in a way that actually made sense. He explained that the filter was located under the pedestal — which I had totally missed — and clarified that not all vents need filters, which was super helpful. He also tested our airflow and pointed out that we were getting less than 560 CFM when the system is designed for 1200 CFM. Thanks to his advice, I now know how to increase airflow and get better performance from the system. On top of being knowledgeable, Joe was also friendly and genuinely funny — a pleasure to have in the house. I’ll definitely be calling them again for any future HVAC issues!”