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
Performed routine tune-up service on residential HVAC system, inspecting the furnace/air handler unit and associated PVC ventilation pipes. Checked all connections on both the HVAC components and adjacent plumbing system, confirming proper installation and functionality of all components. No issues were identified during the inspection.
Performed diagnostic service on aging HVAC system (10+ years) for no cooling complaint. Inspection of internal components revealed normal condition with no visible damage; examined control board connections and verified proper wire terminations at thermostat terminals. System was returned to proper cooling operation after cleaning electrical contacts and verifying refrigerant pressures within manufacturer specifications.
Successfully installed new high-efficiency furnace in basement utility area, including proper connection of intake/exhaust PVC venting system and gas line. Installed condensate drainage system with proper routing to floor drain, and completed all necessary connections to existing ductwork.
Conducted assessment for HVAC system replacement. Inspected existing equipment components including insulated refrigerant lines and copper tubing. Evaluated workspace conditions and equipment placement options in garage/workshop area. Prepared estimate for complete system replacement based on visual inspection findings.
Performed comprehensive tune-up on older model furnace unit. Accessed internal components for inspection and cleaning. Conducted combustion analysis using Bacharach analyzer, which revealed O₂ at 5.7%, CO at 42 ppm, efficiency at 82.9%, and CO₂ at 11.3%. System is functioning within acceptable parameters but operating at moderate efficiency.
Performed comprehensive tune-up on residential HVAC system. Inspected and serviced furnace components including blower motor assembly, circuit board connections, and gas line fittings. Replaced worn coupling component on motor assembly and verified proper electrical connections to ensure optimal system performance.
Performed diagnostic inspection of furnace interior components, examining electrical connections and control modules. Identified and replaced faulty pressure switch that was preventing proper system operation. Tested system after repair, confirming all components functioning within normal parameters and restoring heat to residence.
Performed comprehensive tune-up on HVAC system, inspecting ductwork throughout unfinished basement area. Examined connections between metal ducts and PVC condensate lines, verifying proper installation and sealing at all junction points. No issues identified with the existing ductwork configuration or drainage system.
Performed inspection of existing Lennox Pulse furnace showing significant age deterioration and outdated technology. Documented current installation including PVC venting configuration and basement utility space constraints. Recommended complete system replacement with modern high-efficiency unit to address reliability concerns, improve energy efficiency, and ensure proper ventilation standards per current code requirements.
Performed diagnostic inspection on residential furnace system with access panel open to examine control board and internal wiring. Inspected gas line connection and PVC ventilation/drainage pipes for proper installation and functionality. All components were verified to be operating within normal parameters after service completion.
Responded to no heat complaint on Lennox furnace less than 10 years old. Inspection revealed failed inducer motor preventing proper system operation. Replaced inducer motor assembly, verified proper installation of all electrical connections, and tested system through multiple heating cycles. Unit now functioning correctly with normal flame pattern and appropriate temperature rise.
Successfully installed a complete Lennox HVAC system in the utility area, including proper connection of copper and PVC piping with appropriate valve controls. Completed the installation with PVC ventilation piping to the exterior, ensuring proper system drainage and ventilation.
Performed routine tune-up on aging HVAC system, documenting significant rust/corrosion on internal metal components near the control board. Identified potential moisture exposure affecting the main circuit board with visible damage to surrounding wiring connections. Recommend system evaluation for possible replacement due to advanced corrosion that may compromise electrical integrity and system reliability.
Conducted comprehensive electrical panel inspection for HVAC system replacement evaluation. Documented existing circuit configuration, including dedicated breakers for furnace, A/C, and related appliances. Panel assessment completed to ensure proper electrical capacity for proposed HVAC equipment installation.
Responded to no heat complaint on aging furnace. Upon inspection, found failed control board with visible burnt components. Replaced main circuit board, performed comprehensive system test, and verified proper operation through multiple heating cycles.
Performed comprehensive tune-up service on customer's HVAC system. Removed front panel to inspect internal electrical components, including wiring connections and circuit boards. All components were found to be in proper working order with no signs of wear or damage requiring immediate attention.
Completed water heater installation of Capri unit with proper copper piping connections. Installed control valve assembly with marked flow settings and connected to existing PVC drainage system. All components were secured to wall with no leaks observed during final inspection.
Performed comprehensive system inspection and tune-up on HVAC unit. Checked Sensi thermostat functionality, confirming proper temperature reading at 69°F and verifying all control buttons were operational. System is functioning within normal parameters with no issues detected.
Replaced defective General Filter model 1A-25A with new unit. Installed compatible refill 1A-30 as specified by manufacturer. Verified proper connection to existing plumbing components and confirmed system operation after installation.
Successfully installed a complete water treatment system in the utility area, consisting of a primary blue cylindrical water filter tank with digital control valve and a blue rectangular water softener with brine tank. System was properly connected to the existing copper supply lines with appropriate PVC fittings, ensuring proper functionality and optimal water quality for the residence.