Your Local Heating and Cooling Experts since 1929

The weather in West Bend can pose a challenge to maintaining home comfort. Whether the temperatures get extremely high or low, it’s important to ensure that your HVAC system can handle it.
Our team of professionals are available to help you with all your HVAC repair needs in the local West Bend, Wisconsin area. With over 90 years of experience, we can ensure that your systems are working efficiently so that you can enjoy comfortable temperatures in your home or business.
For HVAC and air quality services in West Bend, look no further than The Thielmann Group. Contact us online or call (262) 299-6197 to get started.
Heating Services
Looking for reliable heating solutions in West Bend? Look no further than The Thielmann Group. With our expert team and top-notch services, we guarantee the highest standards in equipment sizing and installation. Our heating products, including energy-efficient and quiet Lennox furnaces, ensure your peace of mind.
- Furnace repair
- Furnace installation
- Heat pump system repair
- Heat pump installation
- Boiler repair and replacement
- Packaged units
- Commercial heating systems
Our licensed technicians offer trustworthy HVAC and furnace repair services in West Bend, Wisconsin and will restore your heat promptly. We understand the urgency of “no heat” situations during harsh Wisconsin winters.
Our NATE-certified specialists are available 24/7 for emergencies, capable of servicing and repairing all makes and models. Contact us for all your heating or furnace repair needs in West Bend.

Air Conditioner Repair and Installations
If you need a new air conditioning system for your home or business, we have the perfect solution to keep you cool and fit your budget. Our experienced team will ensure a flawless air conditioning installation and the system will be perfectly sized to your space.
Our technicians are factory trained and NATE-certified, equipped with years of knowledge to install your new central air or ductless system with superior workmanship.
We work on all types of cooling systems, including:
- Air conditioners: We can work on all models of air conditioning systems for residential and commercial properties.
- Heat pumps: We can repair, replace, or maintain energy-efficient heat pumps that deliver warm air inside and outside the home.
- Ductless mini-splits: We can service ductless HVAC units that provide total climate control for single rooms.
We proudly offer top-notch Lennox, Daikin, Carrier, Bryant and Mitsubishi air conditioning products, known for their industry-leading performance and energy efficiency. With these systems, you will stay comfortable during hot Southeastern Wisconsin summers while saving on energy bills.
Our technicians also offer air conditioning repair services and can work with you to replace damaged parts in your old system. Give us a call for all your air conditioning needs in West Bend.
Indoor Air Quality
At The Thielmann Group we take pride in ensuring clean and healthy indoor environments for homes and businesses. From humidity control and air purification to duct cleaning and more, we offer HVAC repair solutions to improve your indoor air quality. Trust us to create a fresh and comfortable atmosphere for you and your loved ones.
- Air purifiers
- Humidifiers
- Dehumidifiers

Why Choose The Thielmann Group
Since 1929, our team has been the go-to choice for top-quality residential and commercial HVAC services in West Bend and beyond. Our NATE-certified technicians can service all brands, install Lennox-brand units, provide 24/7 emergency care, and more. Rest assured, we have you covered for all your HVAC needs! Plus, we offer upfront pricing, financing options, special deals, and a job well done.
Contact us online or call (262) 299-6197 to schedule the HVAC services you need.
Read Reviews by Our Customers
EXCELLENT Based on 542 reviews Posted on Stephanie DolnikOctober 10, 2024Trustindex verifies that the original source of the review is Google. Everyone that I have ever came into contact with there has been helpful and wonderful! I would recommend them to anyone!Posted on Aaron WilhelmJuly 19, 2024Trustindex verifies that the original source of the review is Google. Gave me a quote to replace my 29 year old air conditioner.They weren’t the cheapest but were priced with in reason. Installed it quickly and operates wonderfully. I couldn’t be happier.Posted on Lisa FarrellJuly 19, 2024Trustindex verifies that the original source of the review is Google. My husband and I received 5 quotes from 5 different companies before finally deciding upon Thielmann. Although Thielmann was a bit more expensive, the quality we received was outstanding. We went through the Costco Program (Lesa at Menomonee Falls) and received more rebates in doing so. With that program, we received 10% back on our Lennox Air Conditioner and Lennox Furnace. In addition, we received another 2% back by going through Costco and another 2% back by putting it on the Costco Visa card. At any rate, from, Jason, who came to our house to explain what would be done and provide the estimate, to the installers, Ben and Hayden, who provided excellent care installing our new products. They spent the entire day replacing our new HVAC system. The guys were extremely professional and had great precision. Thank you, Thielmann, for a wonderful HVAC system, great customer service, and an amazing job!Posted on Dave SeefeldtJuly 19, 2024Trustindex verifies that the original source of the review is Google. Professional and fast! Installation looks great!Posted on De'Angelo TatumJuly 15, 2024Trustindex verifies that the original source of the review is Google. 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 they did. I had two AC units installed.Posted on Jay OrcholskiJuly 14, 2024Trustindex verifies that the original source of the review is Google. Wayne helped us find the right equipment. Ben and Hyden were great with the install. Wonderful team, as I would highly recommend The Thielmann Group.Posted on Brad DeFauwJune 26, 2024Trustindex verifies that the original source of the review is Google. I recently had the pleasure of working with The Thielmann Group Heating & Air Conditioning to install a mini-split HVAC system for the second floor of our Cape Cod home in Cedarburg, WI, and I couldn't be more satisfied with the entire experience. Professionalism and Expertise: From the initial consultation to the final installation, the team at The Thielmann Group demonstrated exceptional professionalism and expertise. They took the time to thoroughly assess our home and understand our specific cooling needs. Their knowledgeable staff answered all our questions and provided valuable insights into the benefits of a mini-split system for our unique architectural setup. Quality Installation: The installation process was seamless and efficient. The technicians arrived on time, were courteous, and worked diligently to complete the installation with minimal disruption to our daily routine. They were meticulous in their work, ensuring that everything was installed correctly and neatly. I was particularly impressed with their attention to detail and their commitment to maintaining the aesthetic integrity of our home. Performance: The mini-split HVAC system has exceeded our expectations. The second floor, which used to be uncomfortably warm during the summer months, is now perfectly cool and comfortable. The system operates quietly and efficiently, providing consistent temperature control without any noticeable increase in our energy bills. The Thielmann Group's recommendation and installation of this system have significantly improved our home's overall comfort and livability. Customer Service: The customer service we received was outstanding. The Thielmann Group kept us informed throughout the entire process, from scheduling the installation to following up afterward to ensure everything was working properly. They genuinely cared about our satisfaction and went above and beyond to make sure we were happy with their service. Overall Experience: I highly recommend The Thielmann Group Heating & Air Conditioning to anyone in need of HVAC services. Their professionalism, expertise, and commitment to customer satisfaction are truly commendable. Our experience with them was nothing short of excellent, and we are thrilled with the results of our new mini-split HVAC system. Thank you, Thielmann Group, for your exceptional service and for making our home a more comfortable place to live!Posted on Gail EllenbeckerJune 22, 2024Trustindex verifies that the original source of the review is Google. Quick, through team
Recent Jobs and Reviews in West Bend, WI
Job Locations and Reviews
Responded to no-heat complaint on aging residential heating system. Inspection revealed faulty pressure switch preventing ignition sequence. Replaced pressure switch, cleaned flame sensor, and tested system through complete heating cycle, confirming proper operation and restoring heat to residence.
Responded to no heat call for 10+ year old furnace system. Upon inspection, found significant water leak from failed condensate drain causing water accumulation on basement floor. Removed front panel to examine internal components and discovered the blower motor was not operating due to water damage. Installed new motor assembly, cleaned water damage, and restored proper drainage pathway. System tested operational with normal heat output following repair.
Performed diagnostic assessment on Goodman furnace exhibiting no-heat condition. Removed access panel to inspect internal components and utilized multimeter to test electrical connections. Identified faulty control board as the source of system failure, as evidenced by irregular voltage readings at the circuit board terminals. Replaced defective control board and verified proper system operation with complete heating cycle test.
Successfully installed a complete residential HVAC system in utility room, featuring a high-efficiency furnace with digital control interface and integrated indoor air quality component. System installation included proper PVC venting with code-compliant routing, connection to existing ductwork, and synchronization with digital thermostat for optimal temperature control and air filtration performance.
Completed installation of a Lennox furnace unit in basement utility room, including proper connection of intake/exhaust PVC piping and integration with existing ductwork. Performed electrical connections on the control board with appropriate wiring to terminals, ensuring system functionality and adherence to manufacturer specifications.
Performed comprehensive tune-up service on existing furnace system. Conducted electrical diagnostic testing with multimeter on control board components and verified proper voltage readings across all circuits. Inspected ductwork connections, focusing on main trunk line and elbow joint, confirming proper sealing and airflow integrity. All components were reassembled after inspection with no issues identified.
Completed installation of a new HVAC complete system with proper mechanical connections and pipe fittings in the utility area. System was pressure tested using Klein Tools ET180 Differential Manometer, which registered 170 on the scale, confirming proper system pressure within manufacturer specifications.
Performed comprehensive inspection of residential HVAC and plumbing systems in unfinished utility area, focusing on IAQ improvement opportunities. Documented existing installation including PVC drainage pipes, copper supply lines, and black insulated HVAC ductwork. Identified areas requiring modification to optimize indoor air quality performance with current system configuration.
Completed HVAC system replacement in customer's utility room, installing a new Trane XR80 furnace with proper PVC venting secured to ceiling joists. System includes digital thermostat/control panel mounted adjacent to the furnace unit with all electrical connections properly wired and tested for optimal performance.
Successfully completed installation of a new high-efficiency furnace in basement utility area. Connected unit to existing PVC exhaust system with proper venting. System was tested and verified to be operating according to manufacturer specifications.
Conducted detailed assessment of existing toilet installation in bathroom with gray wood-look flooring. Fixture appears to be standard white porcelain model in good working condition with proper wall clearance and functional paper holder adjacent to unit. No visible leaks or installation issues identified during inspection.
Successfully installed new garbage disposal unit under kitchen sink. Completed proper mounting of the black disposal motor to sink flange and connected all white PVC drain pipes with appropriate fittings. Ensured secure connections with rubber gasket and verified system functionality before completing service.
Performed visual inspection of plumbing system infrastructure in utility area. Verified proper installation of PVC piping components with secure black connector rings at junction points. Yellow supply line with measurement markings was confirmed properly fastened to structural framing. All components appeared clean with no evidence of leaks or damage requiring repair.
Performed comprehensive tankless water heater flush service to remove mineral buildup and sediment. Inspected clear sediment trap and drainage components, confirming proper functioning of condensate system. Verified all connections, valves, and PEX supply lines were secure and operating correctly after service completion.
Inspected 15+ year old gas furnace displaying significant rust damage and leakage at the base, with extensive brown-red staining spread across the concrete floor indicating severe internal corrosion. System assessment revealed damaged heat exchanger and compromised components beyond economical repair. Recommended complete system replacement with new high-efficiency unit featuring upgraded filtration system to replace existing Space-Gard unit. Exterior inspection confirmed appropriate electrical service and venting options for replacement installation.
Performed inspection of furnace revealing extensive corrosion and rust damage throughout the interior cabinet and components. Documented severe oxidation on the bottom panel, control board area, and motor assembly mounting points. Unit requires immediate replacement due to compromised structural integrity and safety concerns.
Performed comprehensive inspection of existing HVAC system in basement utility area. Evaluated aging furnace unit with connected ductwork, noting deterioration and inefficiency. Recommended complete system replacement to improve energy efficiency and reliability, with proper sizing of new equipment to match home's heating and cooling requirements.
Successfully installed a complete HVAC system, including a new outdoor condensing unit set on a proper foundation pad with mulch landscaping surrounding the equipment. Connected all refrigerant lines, electrical components, and PVC drain piping according to manufacturer specifications, ensuring the system meets all current safety standards and operational requirements.
Responded to no-heat call for aging HVAC system. Upon inspection, discovered Honeywell thermostat with blank display. Replaced batteries, restored power to thermostat and confirmed proper communication with furnace. System now functioning properly with heat output meeting manufacturer specifications.
Conducted comprehensive inspection of existing HVAC system, focusing on ductwork in basement utility area. Current system maintains indoor temperature at 66°F (heating mode) but evaluation revealed need for full system replacement. Documented condition of metal ductwork, connections, and existing Venmar ventilation controller alongside the primary thermostat for integration considerations in the replacement proposal.