The Thielmann Group

For over 90 years, The Thielmann Group has been the trusted name for heating and cooling solutions in Southeastern Wisconsin. Since 1929, our dedicated team has been providing top-quality residential and commercial installation, replacement, repair, and maintenance services in Oak Creek, New Berlin, Hartford, Burlington, Waterford, and the surrounding areas. Known for our timely service, competitive pricing, attention to detail, and a commitment to going the extra mile, our certified HVAC and IAQ technicians are here to ensure your comfort. Experience peace of mind knowing that, with The Thielmann Group, your home will stay comfortable through the hottest days and coldest nights.