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!
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
Responded to no-heat service call for furnace less than 10 years old. Upon inspection, determined burners were functioning properly with good blue flame pattern indicating appropriate gas combustion. Verified all electrical connections were secure and operational. No further issues identified; system now operating within normal parameters.
Performed diagnostic assessment on aging HVAC system (10+ years old) with no heat complaint. Inspection revealed significant corrosion and rust on interior components, particularly the heat exchanger platform, and identified faulty electrical connections with worn wiring at the blower motor assembly. Cleaned critical components, restored proper electrical connections, and restored heating function.
Responded to a no-heat call for an aging furnace (10+ years). Diagnostic inspection revealed flame sensing issues and worn ignition components evident in the control assembly. Replaced faulty flame sensor and cleaned ignition assembly to restore proper heat function. System now operating within normal parameters.
Performed routine maintenance on Lennox HVAC system. Checked system temperature readings with UEi digital meter (85.0°F recorded), and inspected the Space-Gard Air Cleaner. All components functioning within normal parameters; no issues detected.
Responded to no heat call on system less than 10 years old. Discovered improper PVC cellular core DWV pipe installed on condensate drain. Replaced with proper schedule 40 PVC pipe meeting manufacturer specifications. System now operating normally with appropriate condensate drainage.
Performed routine tune-up inspection of the HVAC system, examining ductwork, plumbing connections, and air handler unit in the mechanical room. Inspected galvanized sheet metal ducts, PVC pipe connections, and copper piping for proper installation and functionality. All components were found to be in good working order with no visible damage or leaks detected.
Performed comprehensive kitchen plumbing service addressing debris accumulation in left basin of double-sink system. Conducted thorough inspection and maintenance of existing carbon water filtration system, ensuring proper function of control panel and associated PVC piping connections. Both systems now operating at optimal performance levels.
Performed comprehensive tune-up on the HVAC system, including inspection of internal components and wiring connections. Identified and cleaned water staining on floor beneath unit, likely from condensate drainage. All mechanical parts, fan assembly, and control boards were verified operational with no visible damage or irregularities.
Performed comprehensive tune-up on residential furnace system located in basement. Inspected electrical connections, tested thermostat functionality, and examined heat exchanger for cracks or deterioration. Cleaned primary components, verified proper operation of blower motor, and confirmed adequate gas pressure and combustion. System is now operating within manufacturer specifications.
Responded to install callback to investigate control system issue. Accessed HVAC unit and verified electronic control board is receiving power as evidenced by illuminated green LED indicator lights. All internal wiring connections were inspected and confirmed to be properly secured and functioning normally. System is now operating to manufacturer specifications.
Diagnosed no-heat complaint on aging system using Fieldpiece manometer, which confirmed low pressure readings of 35.1 across inducer assembly. Inspected blower compartment and found significant dust accumulation on fan motor assembly affecting airflow. Cleaned blower wheel, verified proper operation of safety switches, and restored heat function to manufacturer specifications.
Completed plumbing repair in crawlspace/basement area involving inspection and potential replacement of PVC and copper pipe components. Service included maintenance of connections at valve junction points where the supply system interfaces with drainage components within the structural framework.
Performed comprehensive tune-up on residential furnace system including inspection of internal components, electrical connections, and control board. Removed front panel to access and clean interior machinery, verified proper wiring configuration, and ensured adequate insulation around adjacent ductwork. System was tested and confirmed to be operating within manufacturer specifications.
Performed routine maintenance tune-up on Goodman furnace system. Conducted thorough inspection of internal components including motor assembly, wiring connections, and control board - all components found in normal working condition. Examined installation integrity of PVC venting system and checked ductwork throughout utility area, confirming proper airflow and ventilation.
Successfully installed a new Lennox furnace in the utility room, replacing the previous unit. Completed installation of PVC exhaust venting system with appropriate elbow joints for proper ventilation. System was tested and confirmed to be functioning according to manufacturer specifications.
Performed routine inspection and maintenance service on Bryant residential furnace. Examined ventilation infrastructure including PVC pipes and metal ductwork connections, confirming proper installation and system functionality. Unit appears to be operating normally with no immediate concerns identified.
Performed assessment of existing HVAC system and proposed replacement of outdated Lennox furnace unit. Current installation includes standard sheet metal ductwork with diamond-shaped transition piece and PVC ventilation pipes. Recommended new high-efficiency system with proper connections to existing utility infrastructure in basement mechanical area.
Completed Honeywell Home furnace installation with proper pressure testing using Klein Tools ET100 digital pressure meter (confirmed reading of 1.78). Installation included proper connection of blower motor assembly, electrical wiring, and PVC ventilation system. Final diagnostic checks confirmed all systems functioning within manufacturer specifications.
Performed routine HVAC tune-up service. Inspected exposed PVC drain lines and copper refrigerant lines in basement mechanical area, confirming proper installation and support. Verified all shut-off valves were functional with no signs of leakage at connections or mounting points.
Performed comprehensive furnace tune-up which included removing access panel for full component inspection. Conducted electrical testing with clamp meter to verify proper voltage and amperage readings on control board and wiring connections. Measured gas pressure using digital manometer, confirming readings of 3.50/3.45 inWC, which are within manufacturer specifications for this unit. All diagnostic tests indicate system is operating correctly with no issues detected.