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 • Oct 18, 2026
Certified by Thielmann Heating, Cooling & Plumbing • Oct 18, 2026
MondayOpen 24 Hours
TuesdayOpen 24 Hours
WednesdayOpen 24 Hours
ThursdayOpen 24 Hours
FridayOpen 24 Hours
SaturdayOpen 24 Hours
SundayOpen 24 Hours
Reviews
5.0
502 reviews
5 stars
495
4 stars6
3 stars0
2 stars0
1 star1
SM
Sherrie Multhauf
1 day ago
5.0
Incredible service. Friendly and very knowledgeable.
LD
Larry Dreifke
2 days ago
5.0
Everything was done quickly and cleanly. Nice people.
CN
Caleb Nitz
Oct 2, 2026
5.0
Dan was super great to work with, great at communicating and great at getting the work done well. Really appreciated his knowledge and insight as well. Will definitely use Thielmann again in the future!
BJ
Ben Jefferies
Oct 1, 2026
4.0
TL;DR: outstanding company, just more expensive than I was braced for.
So - these guys are great:
I had some leaky gas pipes at my house. WE energies marked the leaks. I called Thielman to come fix because of great Google review score.
Phone tree worked fine, Great communication, super fast response time, technician Kyle was excellent and early, the job was done very well.
The reason for not 5 stars is simply the cost. The invoice after I paid revealed the hourly rate of the single technician was $353/hr and it took 3 hrs.
This seemed excessively high as a rate, and I was moderately upset about it. Prolly was going to leave a 3 star review, but I reached out to see if anything could be done and a semi-senior back-office guy called me and gave me a decent amount of time in an honest chat, explaining that he would not reduce the cost, but explaining why, and framing it against the pricing structures of some competitors. While the $$ still stung, the decency of a good human chat (not AI!) took away the bitterness - so: 4 stars.
For super urgent things: I’ll call them again
For things that can wait a bit: I’ll look for a more mom and pop shop.
AZ
Alexis Zanish
Sep 30, 2026
5.0
I was so impressed by how knowledgeable Paul and Max were. They were able to fix my hose bib and gave me an estimate for a few other items. I was able to get on the schedule pretty quickly. I definitely will be reaching out and requesting these two for any of my future plumbing needs!
Brand Certified Facts from Thielmann Heating, Cooling & Plumbing
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Certified October 18, 2026Yext Knowledge Graph
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