Serving St. Louis since 1974.

Heating / Cooling Service, Maintenance, and Replacement

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Current Promotions

  • NO INTEREST plus...
    UP TO $2,000 IN REBATES

  • How much does an A/C cost to install?


How much does an A/C cost to install?

Technicians working on HVAC unit

What we do

Our Services

A 2-hour maintenance window you can count on.

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HVAC Repair Services

We're here for you 7 days a week. Our technicians are ready to help.

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HVAC Installation

Ready to upgrade your AC and heating? We offer affordable plans and long-term solutions.

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Financing Services

Do you have questions about financing? No problem! Give us a call today.

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What we do

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We're here for you 7 days a week.

With more than 40 years of experience with HVAC systems and products, our team knows a thing or two about providing top-notch service and maintenance to our customers.

Our HVAC services include repair and installation of furnaces, air conditioners, filtration systems, and other products for home and business owners in the St. Louis metro area.

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Our Current Coupons

Coupons & Specials to save you time & money

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    $30 off

    Emergency Services

    Our technicians are standing by 7 days a week. For $30 off, you have access to same-day service, a repair warranty, and a solution.

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    $50 off

    Whole-Home Humidifier

    Breathe easy with a whole-home humidifier. Our $50 discount deal comes with quick installation, quality service, and top-tier products.

    See coupon details

What we offer

Your St. Louis Heating and Cooling Experts

Weis is proud to offer HVAC installation and repair to customers throughout the Metro St. Louis area and Southern Illinois. Home and business owners need to prepare for seasonal changes; with Weis, we prepare for you.

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Weis Van
  • Daikin Install
  • Aprilaire Install
  • Installation
  • Weis Van

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Frequently Asked Questions

  • Do you offer emergency service?

    We sure do! Contact one of our locations now if you have any heating or AC issues. Our technicians will schedule a time and get to you as quickly as possible.

  • What about HVAC financing?

    Replacing an HVAC system can be difficult for many homeowners. Weis offers fair financing options to customers and can work out the details in person or over the phone.

  • Do you have air filtration units?

    Weis is dedicated to providing full HVAC systems. Air filtration and health and safety are a major priority. Contact us to learn more.

  • What about maintenance plans?

    We'll set up a custom maintenance plan to make sure that your heating and AC are set up on a seasonal basis. These are critical for ensuring efficiency.

Customer Reviews

What real customers say about us.

  • We have been customers of Weis for over 40 years. We have never even considered calling a competitor because we have never had too....

    M. M.

  • Could not ask for better service!! Frank was prompt, knowledgeable and very courteous! Weis Comfort Systems was quick to respond and the price was...

    Jeannie B.

  • As a long-time Weis customer, I consider it an exceptional company. They are competent, dependable, efficient and courteous. Weis has installed and serviced our...

    Richard C.

  • Service person arrived during appointment time frame, phoned ahead, worked in a timely manner, was clean, neat, pleasant, and wore protective boots inside the...

    C. G.

  • I have been doing business with Weis Comfort Systems for over 10 years and would recommend them to anyone. They are professional in their...

    Jim M.

  • Our family has been doing business with Weis for several years and they never disappoint. The owner and employees are top notch at what...

    Mike S.

    We service, maintain, and repair all brands.

    • Weis Comfort Systems

      5 63 reviews

      1591 Fenpark Dr.
      Fenton, MO 63026


      Mon - Fri 8:00am - 4:30pm

      Contact Us
    • Weis DeRousse

      5 63 reviews

      124 N. Main
      Red Bud, IL 62278


      Mon - Fri 8:00am - 4:30pm

      Contact Us
    • Weis Keil-Forness

      5 63 reviews

      301 N Illinois St
      Belleville, IL 62220


      Mon - Fri 8:00am - 4:30pm

      Contact Us
    • Gaines HVAC

      5 63 reviews

      5120 Northrup Ave
      St. Louis, MO 63110


      Mon - Fri 8:00am - 4:30pm

      Contact Us

    $30 off any maintenance visit

    Contact Weis today to learn more about our maintenance HVAC plans.

    $50 off a whole-home humidifier

    Don't hesitate to contact Weis for more details.

    Pricing + Financing:

    Request A Quote Today!

    Is Now Part of the

    Weis Comfort Systems Family!

    I understand

    Need help? Contact Us


    Is Now Part of the

    Weis Comfort Systems Family!

    I understand

    Need help? Contact Us