O’Fallon, IL, HVAC Service.

O’Fallon, IL, HVAC Service. Weis offers certified HVAC service to O’Fallon residents and business owners. We specialize in air filtration, AC repair, heaters and boilers, and other HVAC services. Weis carries the best brands and products on the market. Request a Quote today for 24/7 emergency service or schedule an HVAC tune-up. Weis Comfort Systems is your go-to O’Fallon, IL, HVAC solution.


Our top-notch O’Fallon HVAC services help you maintain functioning and efficient heating and cooling systems. We’ve served O’Fallon homeowners for upwards of 8 decades and continue to offer premium HVAC repair, maintenance, and installation. We offer rebates and coupons, financing, maintenance plans, and other HVAC services in O’Fallon. See our HVAC reviews to learn more about our success.

Dedicated O’Fallon HVAC Service

When your boiler or heater acts up in winter, you will likely regret not having a full HVAC tune-up. We’re a company dedicated to helping customers prevent heating and cooling issues and maintain an efficient system. Keeping your O’Fallon HVAC in good condition reduces power bills and makes sure that your home is warm when it’s cold and cool in the summer.

Weis Comfort Systems is more than an HVAC repair company. Since 1974, we’ve provided O’Fallon homeowners with exceptional service. When you contact Weis, only expect the best. We can prove it with our customer reviews.

O’Fallon Heating Installation and Repair

Furnace Installation and Repair in O’Fallon is essential for property owners. Weis’ factory-certified technicians are ready for emergency heating service. Weis Heating and Cooling can give you free repair or installation quote today. Just visit the service request page or give us a call now.

Weis checks thermostat settings, electrical connections, the condensate drain, and various other parts of your furnace to ensure they work efficiently and keep you and your family warm during the colder months. A well-maintained heater or furnace can save you hundreds of dollars. Besides, you don’t want your furnace to go out when it’s snowing and cold out.

We service a variety of products and brands, including Healthy Climate, Arzel, Aprilaire, Daikin, Lennox, Water Furnace, and others.

Boiler Installation and Repair in O’Fallon, IL

For O’Fallon homeowners and residents, a malfunctioning boiler can be catastrophic. Older properties in O’Fallon may rely on boilers as a heat source. The professional boiler repair and installation technicians in O’Fallon at Weis are here to help. We offer competitive financing to make sure your home is efficient and safe. Please call us for HVAC repair in O’Fallon, IL, now.

O’Fallon AC Installation and Repair

Need air conditioning installation in O’Fallon? Has your AC gone out? The licensed and certified AC techs at Weis provide O’Fallon homeowners with top-notch air conditioning maintenance and installation. Our O’Fallon AC contractors are here 24/7 for emergency repair and installation. Weis uses cutting edge technology and you can expect the best regarding AC repair and installation. We offer seasonal and affordable service to O’Fallon home and business owners.

Emergency HVAC Service

Weis Comfort Systems has served the Greater St. Louis area for more than 80 years. We service and install ALL makes and models of furnaces, air conditioners, and HVAC equipment. We also offer available same-day service to get your furnace or air conditioner running ASAP.

Please view our current specials for 2018 and details about our company by watching our latest video.

HVAC Service Near You

Our preventative HVAC maintenance plans help O’Fallon homeowners and customers keep their heating and cooling systems efficient. There are a lot of things we do to make sure your HVAC systems runs smoothly. These include:

  • Clean your air conditioning coils and evaporators.
  • Checking your central air’s refrigerant level.
  • Adjusting blower components to improve airflow.
  • Checking oil or gas pressure, connections, burner combustion, and heat exchange.
  • Updating your thermostats.
  • Lubricate parts and tighten electrical connections.
  • Inspect the condensate drains for your AC, furnace, or heat pump.

Signing up for a maintenance plan can save you hundreds of dollars every year. We are dedicated to maintaining your HVAC system to ensure safety and efficiency.

Weis also believes in the health and safety of your O’Fallon home. We provide a wide variety of products to ensure your family is safe. This includes carbon monoxide detectors, dust filters, air purifiers, filtration units, and other products. We also have long- and short-term pricing and financing options to help O’Fallon residents with HVAC service. Get in touch with Weis Comfort Systems for more info about financing options.

Weis prides itself on these values:

  • Offering dedicated service since 1974 to O’Fallon homeowners with HVAC quality service.
  • Allowing our customers to pay via cash, checks, or with our flexible financing alternatives.
  • Servicing and installing the best technology in the industry and products. This includes brands like Daikin, Lennox, Water Furnace, Arzel, and others.
  • Guaranteed headache-free HVAC maintenance for O’Fallon customers. We’re committed to solving your HVAC issues quick and efficiently.
  • We also provide practical advice and suggestions to homeowners to avoid future problems with their HVAC systems.
  • A dedication to heating and cooling safety.

Call Your O’Fallon HVAC Experts Now

When you need HVAC repair or installation in O’Fallon, IL, please request service today. Weis Heating and Cooling offers free quotes, too, and is dedicated to keeping your HVAC systems in optimal condition. Let us know how our O’Fallon HVAC pros can help.

  • Air Duct Cleaning
  • Furnace Maintenance
  • Fall HVAC Maintenance
  • Air Filtration Systems
  • AC Maintenance
  • Heating and Air Conditioning
  • HVAC Contractors
  • Furnace Repair Services
  • Air Conditioning Repair
  • Heating and Cooling

Special Offers

Weis Comfort Systems offers multiple specials and discounts every month for our services. These special offers make Weis Comfort one of the most affordable choices in St Louis and Illinois for getting your AC unit or furnace repaired/replaced. Please see below for our latest offers and contact us at (636) 266-2290

Serving St Louis and Illinois for over 80 Years

Richard Weis returned from WWII asked for the keys from his dad and re-opened the shop as Weis Heating Company. He had a process and a plan to economically install central heating in all new homes with the new blower-driven gas furnaces. The housing boom that followed the war allowed the company to expand rapidly.

Nearly 80 years later, the current Weis generation continues the tradition of providing a quality, affordable HVAC service for our customers. At Weis, "When you live and sleep comfortably, so do we."

Call (636) 266-2290 to Get Started

Let’s Get You Comfortable

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