HVAC Companies in O’Fallon. For almost an entire century, Weis Comfort Systems, a professional O’Fallon, IL HVAC company, has provided customers excellent and affordable heating and cooling repair services. Weis’ HVAC contractors combine industry-leading techniques and top brands to optimize heating, vacuum, and air conditioning units’ efficiency and reliability.

As one of the most preferred HVAC companies in O’Fallon, IL, Weis Comfort Systems delivers high-end service in a number of areas. O’Fallon HVAC repair calls for trained professionals with the right tools, experience, and commitment to safety. Providing O’Fallon businesses and homeowners with unbeatable pricing and quality work, Weis Comfort Systems’ services include:

Offering these services and more, Weis is one of the most well-rounded HVAC companies in O’Fallon, IL. We’ll discuss more about our capabilities and services throughout this page. As always, please contact us for more info.

HVAC Companies in O’Fallon, IL

For those who are O’Fallon business or home owners, it’s essential to have an experienced HVAC company on hand. Weis Heating and Cooling is a convenient, flexible, and local HVAC repair and installation company that serves Missouri and Illinois clients. Another reason O’Fallon property owners choose Weis is our flexible short- and long-term financing options.

Weis Heating and Cooling is ready and willing to help replace, maintain, or upgrade your HVAC systems. Our staff are trained, factory-certified professionals that answer any questions you might have about Weis Heating and Cooling’s HVAC repair and installation services. Request more info and a free quote today.


O’Fallon HVAC Companies like Weis Heating and Cooling understand how challenging it may be for some homeowners to handle HVAC repairs. Below you will find a maintenance checklist to give you with a handful of go-to checks and tasks to keep your cooling, heating, and other systems working:

  • Check your thermostat settings to ensure the cooling and heating system maintains at a reasonable and comfortable level. You can save money by investing in digital thermostats to keep their homes cool in the summer and warm in the winter, and even kick on at set times to lower energy usage.
  • Check all electrical connections. You can also measure currents and voltages of a system’s motors. Bad electrical connections are known to result in electrical fires, poor efficiency, and unsafe operation. O’Fallon HVAC contractors like Weis Heating and Cooling point out that poorly-functioning equipment reduces a systems’ performance expectancy. Also check all of the HVAC system’s controls and oil/gas connections.
  • Lubricate all moving parts. "Dry" parts lead to friction and rust. This usually results in increased workload and further reduces your system’s efficiency. Call Weis Comfort Systems for additional information about HVAC maintenance in O’Fallon.
  • Inspect the condensate line. Your AC unit handles water. Ask an AC contracting company about this step or look at these tips on American Home Shield.

It is important to monitor and care for your HVAC systems. Weis Comfort Systems, one of the top HVAC companies in O’Fallon, is here to help customers maintain these systems to improve efficiency, reduce costs, and increase longevity. Besides, who wants to deal with an HVAC problem in the middle of summer or winter? Contact us to learn more and request service.

Weis recommends home and property owners to schedule seasonal HVAC maintenance checks to avoid serious issues. If you are looking for HVAC companies in O’Fallon, IL, give us a call. (636) 266-2290

O’Fallon, IL, HVAC Companies | Why Choose Weis?

For O’Fallon HVAC companies, reputation is important. The expert O’Fallon HVAC contractors at Weis have proven their dedication to service over the years as the best choice for business and home owners needing HVAC repair and maintenance. You can trust us to protect your home and family’s HVAC interests. Read more about our past service in these responses and HVAC contractor reviews. Below are a few of the goals we follow to ensure we are your O’Fallon HVAC company of choice:


A leading O’Fallon HVAC repair contractor, Weis Comfort Systems knows the importance of quality service. We hope to provide the best in the business including certified HVAC contractors, safe and efficient equipment, and no hassle results.


Weis Comfort Systems understands financial constraints put on business and home owners. Weis Heating and Cooling accepts major credit cards (Mastercard, Visa, etc.), checks, and cash. Learn more about our pricing and financing for AC installation, boilers replacement, maintenance, and other services. We also offer coupons and rebates.


Weis relies on state-of-the-art safety protocols, products, and practices in conjunction with hiring methods that ensure high-quality HVAC contractors with excellent backgrounds, skills, and years of experience. Safety is important to our O’Fallon HVAC company.


Our team of highly-qualified, local HVAC contractors in O’Fallon, IL, guarantee affordable, timely, no-hassle HVAC repair and installation. Let Weis know how we can help. Request service today.

Contact Your O’Fallon HVAC Contractor Today

As you now know, Weis is one of the top HVAC companies in O’Fallon, IL. We provide homeowners with HVAC repair, maintenance, and installation while keeping service in mind. Contact Weis Comfort Systems now for more info about our O’Fallon HVAC contractors and services.