Reliable HVAC services are necessary to combat the extreme weather conditions for which Hartford, WI, is known. The Thielmann Group is here to meet those needs, ensuring your comfort and safety year-round. We understand the importance of a well-functioning HVAC system and clean indoor air quality, so we offer comprehensive solutions designed to keep your home comfortable and healthy.
Our team of highly skilled and NATE-certified technicians is here when you need us the most, offering 24/7 emergency HVAC services to tend to all your urgent repair requests. Are you worried about the cost of replacing your HVAC system? We provide free estimates to help you plan your budget accordingly.
Don’t wait until your HVAC system breaks down. Contact us today at (262) 299-6197 to request our professional HVAC services and experience the difference firsthand!

Same-Day Heating Services
The Thielmann Group takes pride in offering same-day heating solutions to families throughout Hartford, WI. Our team has experience repairing and maintaining all types of heating equipment, including:
- Boilers: Whether your boiler needs repair, maintenance, or replacement, our experts can handle it all.
- Gas furnaces: Keep your home warm with our gas furnace installation, repair, and maintenance services.
- Oil furnaces: We provide comprehensive solutions for oil furnace systems to ensure your home stays cozy during the coldest months.
- Heat pumps: Our skilled technicians are well-versed in installation, repair, and maintenance to keep your indoor climate just right.
Reliable Cooling Services
Stay cool during the sweltering summer months with The Thielmann Group’s reliable air conditioning solutions. Our services proudly include installation, replacement, repair, and maintenance for various cooling systems, including:
- Central air conditioning: We ensure your central AC system runs efficiently to keep your home comfortable.
- Ductless mini-splits: We offer ductless mini-split installation and maintenance services for homes without ductwork.
- Packaged units: Our experts are equipped to handle packaged unit systems for both residential and commercial properties.
Trust us to keep your home cool and comfortable throughout the summer season. Call (262) 299-6197 today to schedule AC services in Hartford, WI!
Signs You Need HVAC Services in Hartford
Is your HVAC system in need of urgent attention? Here are some signs to watch out for:
- Inconsistent temperatures: Uneven heating or cooling throughout your home.
- Increased energy bills: A sudden spike in energy costs can indicate HVAC system inefficiency.
- Strange noises: Unusual sounds from your HVAC system may indicate a problem.
- Poor air quality: Dusty or polluted air can lead to health issues for you and your family.
If you notice any of these signs, don’t hesitate to contact The Thielmann Group at (262) 299-6197 for prompt and professional HVAC services!
Top-Rated Air Quality Services
Indoor air quality is crucial for a healthy and comfortable living environment. The Thielmann Group offers several indoor air quality solutions to address your specific needs, including:
- Air purifiers: Improve air quality by removing allergens, dust, and pollutants.
- Humidifiers: Maintain optimal humidity levels for better comfort and health.
- Dehumidifiers: Prevent excess moisture and mold growth in your home.
- Duct cleaning: Remove contaminants from your ductwork for cleaner air.
Breathe easier with our top-rated indoor air quality services. Request IAQ services for your home by calling us at (262) 299-6197 today!
Professional Plumbing Services in Hartford, WI
Your home’s plumbing system is one of the most important, yet often forgotten, systems in your house. When plumbing problems arise, they can turn from inconvenient to down right dirty in seconds. Having a reliable team of Hartford plumbers on your speed dial can make all the difference. Thielmann Heating, Cooling, and Plumbing has been serving homeowners since 1929. This means we understand what your home needs and treat each problem with professional, quality workmanship.
Our trained, certified team of plumbers in Hartford are able to handle everything from new fixture installations to major pipe repairs, and everything in between. For Hartford, WI homeowners needing fast, reliable plumbing services, Thielmann offers:
- Water Heater repair and replacement that ensure you always have hot water
- Drain cleaning to clear buildup and remove clogs
- Kitchen faucet, sink, and garbage disposal installation and service
- Bathroom fixtures and toilet repair and installation
- Minimally invasive pipe repair and replacement to improve water pressure
- Sump pump services to ensure a dry, safe basement.
Water Conditioning in Hartford, WI
For residents in Hartford, WI, hard water can damage your home’s plumbing system and shorten the life of your appliances. That’s why Thielmann Heating, Cooling, and Plumbing offers complete water conditioning services designed to help you protect your home. Our team will test your home’s water to help you make the best decision and find the right solution. After all, the cleaner your water, the better you feel when bathing, cleaning, and cooking.
Why Choose The Thielmann Group in Hartford?
The Thielmann Group is proud to be the trusted choice for reliable HVAC and indoor air quality solutions throughout Hartford and the surrounding area. When you choose our team, you can always count on us for:
- NATE-certified, background-checked technicians
- Free replacement estimates
- Upfront, honest pricing
- Flexible financing options
Don’t compromise on comfort and safety in your home. Choose The Thielmann Group and experience superior service that ensures your home remains a haven of comfort and health.
Call (262) 299-6197 to schedule HVAC or IAQ services in Hartford today!
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 Hartford, WI
Job Locations and Reviews
Completed installation of a new residential HVAC system including a beige furnace unit with associated copper lines, electrical connections, and control components in the utility area. System installation included proper connection to existing PVC drainage/ventilation pipes mounted along wooden joists, with all required plumbing and electrical work completed to ensure optimal system function.
Responded to service call to inspect plumbing connection at utility fixture. Visual inspection revealed proper installation of PVC to copper pipe transition with no signs of leakage or deterioration. Connection appears to be functioning normally with no remedial action required.
Performed comprehensive furnace tune-up including inspection of internal components (blower assembly, motor, circuit board, electrical connections) and ventilation system. Examined ductwork and PVC exhaust piping for proper installation and function. All systems operating within normal parameters with no issues detected.
Performed comprehensive tune-up on Lennox furnace system. Inspected and cleaned all components, checked PVC intake/exhaust venting for proper installation and airflow. Verified connections and operation of ductwork and associated plumbing components. System is functioning within manufacturer specifications with no issues detected.
Conducted comprehensive HVAC system tune-up focusing on plumbing infrastructure and system leveling. Inspected PVC pipe network for proper drainage connections and verified equipment level positioning using precision measurement tools. System was confirmed operational with all components properly aligned and secured.
Responded to no-heat call for Ruud furnace system installed in basement. Visual inspection revealed condensate drainage issue in the PVC pipe assembly connected to the furnace. Cleared blockage in condensate line and verified proper drainage. System tested through complete heating cycle with proper operation restored.
Performed routine preventative maintenance on residential furnace system. Inspected refrigerant lines, checked all electrical connections, and examined internal components with access panel open. System is operating within normal parameters with no immediate concerns identified.
Inspected tanked water heater system and identified significant corrosion at connection point. Observed rust development on metal components and deterioration around hex bolt/fastener with compromised sealant. Replaced corroded fitting and applied new sealant to prevent future moisture intrusion and extend system lifespan.
Responded to service call for water leak. Inspected and diagnosed condensation issue at PVC pipe junction where black PVC connects to white PVC piping. Installed new sealing material at the connection point and verified proper operation of the red water pump system with associated drainage components.
Performed comprehensive HVAC tune-up service including inspection of interior furnace components, verification of proper wiring connections to control board, and examination of heat exchanger integrity. System was leveled using spirit level to ensure optimal operation and proper condensate drainage.
Performed comprehensive HVAC tune-up service including leveling of equipment housing and inspection of internal blower assembly. Verified proper wire connections to control board (red, green, yellow, white) and examined motor condition. System was returned to level operation with all components functioning within normal parameters.
Performed scheduled maintenance on furnace system including electrical component inspection and diagnostic testing using multimeter. Accessed and examined internal wiring and control components, ensuring proper electrical connections and function. Utilized portable work light for thorough visual inspection of all internal components.
Conducted comprehensive assessment of existing water heating system in basement utility area. Inspected 40-gallon gas water heater showing signs of age and potential efficiency issues. Evaluated current water treatment system including softener and brine tank for compatibility with recommended replacement options. Documented complete plumbing configuration including ventilation and connection points to ensure proper specification for replacement equipment.
Completed installation of Mitsubishi Electric mini-split system with outdoor condenser unit properly set on concrete pad with gravel base. Indoor head unit was wall-mounted in construction space with exposed ceiling joists. System was pressure tested, evacuated, and charged according to manufacturer specifications with final diagnostic verification confirming proper operation.
Performed comprehensive tune-up on residential boiler system. Inspected copper piping network, expansion tank, and control valves for proper operation. Conducted combustion analysis with Bacharach analyzer, confirming 91.2% efficiency with O2 at 5.1%, CO at 94ppm, and CO2 at 10.4%, all within acceptable parameters.
Performed warranty inspection on residential HVAC system. Examined furnace interior components including heat exchanger, burner assembly and control board connections. Verified proper wiring connections to terminals and inspected PVC venting system for proper installation. All components functioning within normal parameters with no operational issues identified.
Performed routine HVAC tune-up using dual port manometer to test system pressure readings (352/287), verifying proper operation within manufacturer specifications. Inspected basement ductwork configuration and PVC exhaust/intake piping for integrity and proper installation, confirming all components are functioning correctly with no issues detected.
Performed routine tune-up service on customer's furnace system, including inspection of internal components and electrical connections. Removed front panel to access and clean blower motor assembly and verify proper operation of circuit board. Conducted electrical testing to ensure all components are functioning within manufacturer specifications, confirming system is operating safely and efficiently.
Performed comprehensive tune-up on residential furnace system located in basement utility room. Conducted thorough inspection of internal components including control board, wiring, and mechanical elements. Cleaned and serviced the unit, ensuring proper operation of the furnace and connected exhaust ventilation system.
Completed prepaid maintenance service on residential gas furnace. Removed access panels to inspect internal components including control board, gas valve assembly, and electrical connections. System appears to be properly installed with appropriate PVC venting and accessible service clearances.