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.
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Certified by Thielmann Heating, Cooling & Plumbing • Mar 08, 2026
Certified by Thielmann Heating, Cooling & Plumbing • Mar 08, 2026
Reviews
5.0
448 reviews
5 stars
444
4 stars3
3 stars0
2 stars0
1 star1
DP
Douglas Packard
Oct 29, 2025
5.0
Nick K was Very nice to work with and explained everything he did and also made an appointment to have the boiler check for us. Very satisfied
MJ
Monique Jahnke
Oct 28, 2025
5.0
Ron B and Carlos were very professional and took the time to answer all of my questions. They did not rush through the job.
I recommend this company.
KG
Kristen Garey
Oct 28, 2025
5.0
Andy is the best! So friendly, very thorough and explains everything in a way that is understandable for someone not in his field. Thanks for all of your help. We lost our water heater in the floods and they installed a reciprocating device, removed the water softener and converted our system to a tankless system.
LH
Lori Hegarty
Oct 28, 2025
5.0
Excellent customer service skills! Josh has a great friendly personality and very knowledgeable regarding all aspects of our heating system. Thank you Josh!
ST
Sean T
Oct 28, 2025
5.0
Ron was efficient, friendly and gave me confidence that he knew what he was doing. He also gave guidance in next steps for a long term solution. Thank you, Ron, for getting my hydronic system drained, cracked radiator removed / blinded off and the system back up and running so that I could have heat in my home again.
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Certified March 08, 2026Yext Knowledge Graph
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