Thielmann Heating, Cooling & Plumbing

Since 1929, Thielmann Heating, Cooling & Plumbing has been Southeastern Wisconsin’s trusted choice for dependable comfort and quality service. Our experienced team provides expert heating, cooling, and plumbing solutions for homes and businesses, including the installation, repair, and maintenance of high-efficiency furnaces, air conditioners, ductless mini-splits, and indoor air quality systems. We also specialize in plumbing services such as water heater replacement, water treatment systems, and leak detection and repair.

Thielmann is committed to delivering the highest level of craftsmanship with over nine decades of experience to every job — ensuring your comfort, safety, and peace of mind year-round.