Southeast Wisconsin HVAC | #1 HVAC Company Since 1929
Same-Day Service
Heating and cooling emergencies happen when you least expect them. Contact the professionals at The Thielmann Group to assess and fix the situation you're dealing with. We have the necessary skills and tools to fix your system so you can safely use it once again. Call the Thielmann team at (262) 299-6197 to get emergency HVAC services in Southeast Wisconsin.
The Thielmann Group Offering Reliable Heating &
Cooling
For Over 90 Years
Southeast Wisconsin HVAC Experts Deals & Financing

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Our Deals

Save On Your Service Today

Save Big And
Stay Cool this Summer!

AC Tune-Up Only $99

Request Service Expires 07/31/2024
Call to book your appointment!
Same Day Approval Best in industry financing available.

0% Financing Available

Request Service Expires 07/31/2024
*Terms & Conditions May Apply.
Take advantage of additional rebates and tax credits

Up to $6095!!!

Request Service Expires 07/31/2024
Call us Today
Save Big And
Stay Cool this Summer!

AC Tune-Up Only $99

Request Service Expires 07/31/2024
Call to book your appointment!
Same Day Approval Best in industry financing available.

0% Financing Available

Request Service Expires 07/31/2024
*Terms & Conditions May Apply.
Take advantage of additional rebates and tax credits

Up to $6095!!!

Request Service Expires 07/31/2024
Call us Today
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, Waterford, 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.

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Our Reviews

See What Your Neighbors Are Saying

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!

Paul K.

Paul K.

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…

Christin C.

Christin C.

They performed an April Air install for us. Very professional, fast, knowledgable and responsive. Best price compared to the other places I called. They thought there may be difficulties installing due to our furnace set up, but were still willing to come out and try and…

Jenni S.

Jenni S.

The Thielmann group team was professional, knowledgeable, and on time. They did a fantastic job at a reasonable price. From our first encounter, we could understand how experienced the group was. There were no issues, and the new furnace worked perfectly. I highly recommend them.

Vincent R.

Vincent R.

Thielmann Group installed a new furnace and heat pump for us. We have been using them for HVAC maintenance for several years and were always happy with their service. We got quotes for the new system from a few companies and we were pleased that they…

Laurie K.

Laurie K.

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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

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