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 maintenance visit on natural gas HVAC system. Conducted combustion analysis using Bacharach analyzer, confirming proper operation with excellent efficiency readings of 97.4%, O₂ at 8.0%, CO₂ at 7.3%, and safe CO levels at 26 ppm. All parameters within manufacturer specifications.
Performed routine HVAC system tune-up including inspection of existing ductwork and ventilation components. Checked PVC drainage pipes for proper installation and functionality. Examined furnace unit for operational efficiency and inspected nearby plumbing components, noting some rust/corrosion on metal surfaces that should be monitored but does not currently affect system performance.
Installed new tanked water heater in basement utility area alongside existing water filtration/softening system. Properly connected copper pipes, installed metal ventilation pipe to ceiling, and verified all valves and connections were secure and operational. System was tested and confirmed to be functioning correctly.
Performed comprehensive tune-up service on Lennox furnace system with integrated PureAir Air Purification component. Inspection revealed all internal electrical components, wiring connections, and mechanical parts in normal working condition with no signs of damage or deterioration. Verified proper operation of drainage system, including PVC piping and connections, and confirmed appropriate airflow through ductwork.
Responded to no-heat service call for aging Goodman furnace. Upon inspection, identified failed blower motor and worn wiring as root cause of heating failure. Replaced motor assembly, reconnected electrical components, and performed comprehensive system test to confirm proper operation and restore heat to residence.
Successfully completed installation of a new residential HVAC system, including placement of the outdoor condenser unit on a level pad adjacent to the home's exterior. System installation included proper electrical connections with protective conduit and appropriate drainage setup through the concrete floor to ensure proper condensate removal.
Successfully installed a Reliance tanked water heater in utility room. Connected unit to existing plumbing with copper fittings and verified proper connection to ventilation system via PVC piping. Installation completed with all required valves and safety features in place according to manufacturer specifications.
Completed routine tune-up of HVAC system, inspecting and documenting PVC condensate drainage components for proper installation and alignment. Verified equipment identification and serial numbers on system components to ensure accurate service documentation.
Performed routine maintenance tune-up on residential HVAC furnace system. Inspected internal components including wiring, valves, and mechanical parts with front panel removed. Checked PVC venting and connected ductwork for proper operation and airflow.
Conducted standard HVAC system tune-up service and performed equipment leveling check using spirit level. Unit was found to be properly installed with appropriate pitch and balance. No operational issues detected during inspection.
Responded to service callback for Lennox furnace system. Inspected unit, verified proper installation of exhaust and intake venting, and checked connection components. Unit is functioning within normal parameters with no operational issues detected.
Inspected residential mechanical room containing plumbing infrastructure and water heater system. Verified proper installation of PVC drainage/ventilation pipes and examined water heater with metallic exhaust vent featuring silver insulation wrapping. No immediate issues identified in the visible components of the system.
Performed routine tune-up on residential HVAC system, including inspection of the furnace unit and associated Honeywell control components. Examined PVC ventilation piping and connections for proper installation and functionality. Confirmed all electrical wiring connections were secure and operational. System is now functioning within normal parameters.
Conducted inspection of existing Bradford White water heater installation in basement utility area. System appears properly installed with insulated piping, appropriate flexible hose connections, and electrical connections. No immediate issues observed with the unit or its connections; installation appears well-organized with proper insulation to prevent heat loss.
Performed comprehensive assessment of existing residential furnace system located in basement utility area. Documented current installation configuration including ductwork connections, PVC intake/exhaust venting, and electrical connectivity. Noted concrete floor condition showing cracks with drain access point and existing electrical conduit placement for replacement planning purposes.
Completed comprehensive tune-up of basement HVAC system including inspection of furnace internal components (motor, wiring, mechanical parts) and associated ductwork. Examined condensate line with pink/magenta valve and verified proper connection to main plumbing system. Inspected ceiling infrastructure including proper mounting of PVC pipes and metal ducts to ensure system integrity and optimal performance.
Performed comprehensive tune-up on residential HVAC system, including inspection of furnace cabinet components, belt drive, motor, and ventilation connections. Checked condensate drainage system with particular attention to PVC piping network and drain line functionality. All components were verified to be in normal working condition with no signs of damage or deterioration.
Inspected customer's plumbing infrastructure in utility area, focusing on two PVC pipes with GelLine branding connected to what appears to be an HVAC or ventilation system. Completed standard tune-up procedures on equipment, ensuring proper connections and functionality of all components.
Performed comprehensive tune-up service on residential gas furnace installed in basement. Conducted thorough inspection of all internal components including control board, wiring connections, and exhaust system. Checked PVC venting pipes for proper installation and potential obstructions. Noted possible previous water leak near unit base; recommended monitoring for recurrence. All systems tested operational with no immediate concerns identified.
Performed diagnostic inspection on ceiling-mounted Lennox HVAC unit in basement showing no heat operation. Unit appears to be 10+ years old with deteriorated components. Replaced faulty ignition assembly and cleaned flame sensor to restore proper heating function. System now operating within normal parameters with good heat output and proper cycling.