Heating & Air Conditioning

If your system, for whatever reason, is not keeping your home comfortable, our technicians are available to help your home get back to normal as soon as possible.

Air Duct Cleaning

Our technology allows us to clean every inch of duct by scraping the sides of the duct work and removing debris through our HEPA vacuuming equipment.

New Construction

If you are planning to build a new home, or renovate an existing home, we offer all of the services for new construction that we do for repairs!

Seasonal Maintenance

Just like your car needs an oil change, seasonal maintenance agreements have proven to cut back on emergency system failures.


Sigman Heating and Air Conditioning provides quality heating and cooling service and sales to St Louis, Missouri and Illinois customers, the best heating and cooling brands and dependable heating and cooling service. Residential and commercial HVAC service customers trust us for existing and new heating and cooling service. Our experienced team can help determine the right product for your needs.

We service all brands of heating and cooling equipment. The products we sell are designed to give you year-round comfort. With available rebates, tax credits, and financing with approved credit, you could have comfort today!







    We're proud to receive Angie's List (now Angi) Super Service Award for the fourth year straight. Find out what others are saying about us!




    Sigman Heating & Air Conditioning is a registered Program Ally of the Ameren Illinois Energy Efficiency Programs.







    Tom L., Swansea, IL

    Very satisfied with the system. Have saved on heating/cooling bills since it has been installed. Runs efficiently and quietly. We have done business with Sigman for the past 20 years. From the owner, down through the employees, all are friendly, courteous and knowledgeable. A very well run business.

    Pam Q., Belleville, IL

    It is really great to know that on an ongoing basis our A/C and Heating needs will be handled by a very good company with great associates.

    The Chuck Wagon, Fairview Heights, IL

    Thank you again. The restaurant has been very cool this summer and the power bill for one month seems to be reduced by 20%. As always, you will be highly recommended by us for your excellent service to our family business.

    Paul F., St. Louis, MO

    [Your service technician] was so professional; took care of the problem quickly, explained what he was doing. I couldn’t have been more pleased with the service call. I will definitely call on your company again for any and all service needs at my house and office.

    Shiela U., Belleville, IL

    If the quality of Sigman service technicians is an indication of the quality of your product, then I know we will be quite pleased.

    Rebecca T., Glen Carbon, IL

    We appreciate all your effort in making sure our recent investment was up and operating to our expectations and satisfaction. Jerry and your team did a great job!

    Rick C., Valmeyer, IL

    We just wanted to thank you for your speedy service. We discovered our furnace was not working on our lunch. We called you and by evening we had our heat running. You were a life saver.

    Marc E., Columbia, IL

    The technicians were very efficient and worked together like clockwork. They completed the job in one day and cleaned up all the area and did not make a mess

    Tom H., Belleville, IL

    [The salesman] was professional, friendly and knowledgeable. Sigman office staff friendly and accommodating. [The installers] worked hard (even in the rain) to complete our job. They explained everything and were friendly and neat. They work well together and make a good team.


    6200 Old St. Louis Road
    Belleville, Illinois 62223 US

    Get Directions


    Ph: 618-234-4343
    MO: 314-436-2600