Thielmann & Son is Southeastern Wisconsin’s top heating and cooling company. Dedicated to providing Wisconsin residents with the best equipment. Our selection of Furnaces, Air Conditioners, and Ductless Systems is among the best performing, most reliable brands in the industry. Combine that with our certified and experienced team members and you have a winning combination.

Furnances & Air Conditioners

Ductless Air Conditioners

Heat pumps

Boilers

Thermostats