The Thielmann Group knows no bounds. We have proudly been your heating and cooling experts in Southeast Wisconsin since 1929! We offer exceptional service to residential and commercial customers across southeast WI. When you turn to us for your furnace repair, air conditioning repair, or the installation of new equipment, you will have peace of mind knowing that we have spent nearly a century making Wisconsin homes comfortable. The Thielmann Group provides all your heating and cooling needs, air quality systems, sheet metal services, and repair of all makes and models of heating and cooling units. Generations of loyal customers turn to us for quality products and expertly performed installations. Let the experienced professionals at the Thielmann Group put their years of expertise to work for you. We have an A+ rating with the Better Business Bureau, thousands of satisfied customers, and outstanding reviews on websites such as Angi, Yelp, Google, Lennox, and more.