About The Thielmann Group

The Thielmann Group has been providing reliable residential and commercial heating, cooling, and indoor air quality services to Southeastern Wisconsin since 1929. Customers praise the company for its outstanding service, quality products, and attention to detail. The staff are known for their professionalism and courtesy, always ensuring to clean up after their work. The Thielmann Group is dedicated to going the extra mile, quickly correcting any issues and addressing customer needs efficiently. Recent customers have highlighted the quick response to AC and furnace problems, with some receiving new units within a day, and praise the crew for their pleasant and thorough work, including explaining the process and cleaning up afterward. The company's reliable service and focus on customer care continue to earn high praise from the community.

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Reviews for The Thielmann Group

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  • Jun 2025

    We decided we needed a new hot water heater. Our current heater still worked but was over 15 years old and we knew it was time for a replacement. We have worked with The Thielmann Group for nearly thirty years for all of our heating and cooling needs so we naturally asked them for estimates on a hot water unit. We were thrilled with the selection they offered as well as the pricing. Kevin C and his associate came out today and did an excellent job installing the new heater. They were right on time, efficient, courteous and knowledgeable. We couldn’t be happier with the job they did and feel good knowing we won’t have any issues in the future with water problems. We...read full review

  • May 2025

    We needed a tune-up on our AC unit. We always use Thielmann Group. Ron performed the tune up and we were 100% satisfied. He has over 30 years experience and was thorough, efficient and knowledgeable. He recommended we sign up for Thielmann’s heating and cooling maintenance program, and we decided to based on his recommendation. We are thrilled as it provides a great cost savings to us for our annual furnace and AC maintenance. He also helped us get set up with Dave from Thielmann for an estimate on a new water heater. Our old one was also purchased from Thielmann 18 years ago - well past the normal life span for a water heater- he has provided us with multiple options...read full review

  • Mar 2025

    Ron arrived in a timely fashion, explained what he was doing and suggested a couple of options for me to consider to improve the air quality in my home. He also suggested I sign up for their membership; which includes a furnace inspection, an AC inspection, and a plumbing inspection for only $20 a month. The $120 for the year was less than what my service fee would have been! NB!

Hours

Monday: Open 24 hoursTuesday: Open 24 hoursWednesday: Open 24 hoursThursday: Open 24 hoursFriday: Open 24 hoursSaturday: Open 24 hoursSunday: Open 24 hours

Tips

 on-site services accepts credit cards