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For Over 90 Years Southeast Wisconsin HVAC Experts Deals & Financing
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What To Expect
Discover the Thielmann Group Difference
Fully Licensed & Insured
Our experts have the expertise and training to deliver the highest quality services every time.
Trusted Since 1929
We have served Southeastern Wisconsin for nearly a century, so we understand the needs of our community.
Financing Available
We offer various options from financing partners to help you meet your specific needs and budget.
5-Star Customer Service
The Thielmann Group promises five-star customer service with every interaction.
Committed to Excellence
We complete jobs quickly without compromising our commitment to excellence.
Satisfaction Guarantee
Our team is dedicated to ensuring your 100% satisfaction with every service we perform.
Fully Licensed & Insured
Our experts have the expertise and training to deliver the highest quality services every time.
Trusted Since 1929
We have served Southeastern Wisconsin for nearly a century, so we understand the needs of our community.
Financing Available
We offer various options from financing partners to help you meet your specific needs and budget.
5-Star Customer Service
The Thielmann Group promises five-star customer service with every interaction.
Committed to Excellence
We complete jobs quickly without compromising our commitment to excellence.
Satisfaction Guarantee
Our team is dedicated to ensuring your 100% satisfaction with every service we perform.
Heating, Cooling, and HVAC Services in Southeastern Wisconsin
Servicing All Your Residential and Commercial Needs
The Thielmann Group has provided quality heating, cooling, and HVAC services to Southeastern Wisconsin since 1929. We offer residential and commercial installation, replacement, repair, and maintenance services in Oak Creek, New Berlin, Milwaukee, Hartford, Burlington, Wauwatosa, and the surrounding areas. The team at our HVAC company is proud to offer timely service and competitive pricing in your local area.
Our technicians pay attention to the small details and are willing to go the extra mile for our customers! Our certified HVAC and indoor air quality technicians do whatever it takes to keep our customers comfortable. When you work with our skilled professionals, you can rest assured that your home will remain comfortable during our hottest days and coldest nights.
Contact the Thielmann Groupat (262) 299-6197 today to schedule residential or commercial heating, cooling, or indoor air quality services in Southeastern Wisconsin.
Quality Cooling and Air Conditioning
Summers in Wisconsin can be unbearable without a cooling system that you can trust will keep you cool and comfortable. Our team will ensure that your air conditioning, ductless mini-split, heat pump, and packaged units work at their best regardless of the temperature. Our team can install, replace, repair, or maintain whatever unit your business or home has.
Dependable Heating in Wisconsin
The Thielmann Group knows the importance of a reliable heating system in Wisconsin. Whether you need residential or commercial heating services, our team has you covered. We offer HVAC installation, replacement, repair, and maintenance services for gas and oil furnaces, heat pumps, boilers, ductless mini-splits, and packaged units!
Indoor Air Quality Services
Our indoor air quality specialists can improve the air quality in your home or commercial property by assessing your air quality and recommending the best solution for your Wisconsin home or business. The technicians at our HVAC company can install, replace, repair, and maintain air purifiers, humidifiers, and dehumidifiers. We also offer duct cleaning services to ensure your air is always free of dust and debris.
Call the Thielmann Group at (262) 299-6197 or contact us online to schedule heating, cooling, or indoor air quality services in Southeastern Wisconsin.
Our Reviews
See What Your Neighbors Are Saying
I liked my experience with them. The guys I spoke with prior to doing the work, the estimation phase , and the ones I spoke with after the work was completed had enough knowledge and suggestion to answer all my questions. I’m pleased with the job…
Excellent team from start to finish. They were all very respectful of our property, as they promptly and professionally went about their task of installing a new air conditioner system. The system works very well, so far. It is also much quieter than the previous 40+…
Thielmann did a tremendous job replacing our Carrier furnace. They worked with us to make sure we were able to get the right product and even worked with Carrier on the issues we were seeing on our old furnace as it was failing sooner than it…
I've been using Thielmann Group for all my heating and air conditioning since I built my house 23 years ago. They have been great in emergency service and regular maintenance service. On time and very friendly staff. Would, and have, recommend them to anyone!
I have used Thielmann for both installation of a new furnace + A/C recently, but also an install of a ductless mini-split unit six years ago. I fully trust their brands and recommendations. I can't say enough of about this company. Every single person from administrative…
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Why Choose the Thielmann Group?
Offering Reliable Heating & Cooling in WI for Over 90 Years
- Same-day services
- Licensed & insured
- NATE-certified & background-checked technicians
- Free estimates on replacement quotes
- Maintenance plans available
- Upfront pricing & financing options
- Military, veteran & senior discounts
- A+ rating from the Better Business Bureau
- Lennox Feel the Love partner
Proudly Serving
Southeastern Wisconsin
Oak Creek | New Berlin | Hartford | Burlington | Waterford | & The Surrounding Areas