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
Responded to a no-heat call for a Bryant heating system under 10 years old. Upon inspection, accessed the furnace's internal components and examined the blower motor assembly, control board, and wiring connections. Discovered faulty wiring in the motor circuit which was preventing proper operation. Repaired damaged connections and verified system operation before closing access panel.
Performed inspection of GE electrical panel showing signs of age and wear. Panel has main breaker with handwritten circuit directory and visible wiring extending from top. Adjacent Lennox HVAC system was noted with insulated ductwork and associated piping. No electrical modifications were made at this time; assessment completed for future fixture and outlet installation planning.
Performed diagnostic inspection on Goodman furnace with no-heat complaint. Found faulty flame sensor causing improper ignition sequence. Cleaned sensor contacts, tested system functionality through multiple heating cycles, and verified proper operation. Unit now functioning correctly with normal flame detection and consistent heat output.
Responded to no-heat call for relatively new furnace unit located in basement. Upon inspection, identified failed ignition sequence due to dirty flame sensor. Cleaned flame sensor contacts, verified proper ignition sequence, and tested system through complete heating cycle. Unit now operating at manufacturer specifications with proper flame detection and consistent heat output.
Responded to customer's no-heat call for unit less than 10 years old. Upon inspection, found clogged air filter restricting proper airflow through the system. Removed and replaced filter, cleaned internal components, and verified proper ignition sequence. System now operating at optimal performance with restored heat output.
Responded to a no-heat call for a relatively new furnace system. Upon inspection, discovered faulty pressure switch causing system failure. Replaced defective pressure switch, tested system operation through multiple heating cycles, and verified proper ignition sequence. Unit now functioning correctly with normal heat output.
Performed comprehensive inspection of existing HVAC system in basement area. Evaluated electrical panel capacity and breaker configuration to ensure compatibility with potential replacement unit. Documented current installation including furnace unit with PVC venting, air handler with associated ductwork, and condensate drainage system. Assessment indicates system is properly installed but replacement options were presented to homeowner based on age and efficiency considerations of current equipment.
Responded to no-heat call for aging furnace system. Upon inspection, found failed ignition control module causing system failure. Replaced faulty module, cleaned flame sensor, and performed complete system check. Unit now functioning properly with normal ignition sequence and adequate heat output.
Responded to no-heat call for aging system. Diagnosed faulty control board on furnace showing intermittent operation. Replaced control board, cleaned flame sensor, and verified proper ignition sequence. System now operating within manufacturer specifications with consistent heat output.
Installed new furnace unit with proper connection to existing ductwork and ventilation system. Performed electrical wiring installation and conducted diagnostic testing with digital measurement tool, confirming proper system operation with readings at 45.8. Completed installation with all necessary connections to home's mechanical systems including proper venting through PVC piping.
Responded to no-heat call for an aging Williamson heating system (10+ years old). Upon inspection of the unit in the basement utility area, identified and replaced a failed ignition control module and cleaned significant mineral deposits from the heat exchanger. System was tested after repairs with proper ignition sequence restored and normal operation confirmed.
Conducted inspection of furnace system with focus on electrical connections and burner assembly. Verified proper electrical cord connections to main power outlet terminal. Confirmed normal flame pattern with consistent blue coloration across all burners, indicating complete combustion and proper gas-air mixture.
Installed pressure-balancing mixing valve with temperature control in copper supply line system. Connected valve to existing copper piping and integrated with PVC drainage components. Tested system for proper pressure regulation and temperature control functionality.
Successfully installed a complete Lennox HVAC system in the client's basement utility room. The installation included proper mounting of the furnace unit with appropriate PVC exhaust/intake ventilation, connection to existing ductwork, and verification of all system components for optimal performance.
Performed annual maintenance service on HVAC system. Conducted pressure testing using dual port manometer, confirming readings of 4.90 and 4.75 on primary and secondary ports. Inspected PVC condensate drainage piping and associated electrical components including the PM12440 40VA transformer, all found to be in proper working condition.
Conducted routine maintenance inspection on HVAC system with focus on PVC condensate line. Examined pipe installation and insulation collar integrity. Checked connection points and drainage functionality. System appears operational with no immediate concerns noted.
Conducted assessment of basement HVAC installation area featuring concrete flooring with existing drain access. Documented current air handler configuration with foil-faced insulated ductwork connected to vertical furnace unit. Evaluation completed for replacement estimate of aging system in utility room with concrete block walls.
Inspected and documented plumbing infrastructure in attic/crawlspace area. Verified proper installation of PVC drainage system connected to copper supply lines. Confirmed all pipe supports and fasteners were secure with no visible leaks at connection points.
Conducted diagnostic assessment on gas furnace due to no heat complaint. Inspection revealed faulty control board with damaged relay contacts preventing proper ignition sequence. Replaced control board, verified proper voltage to ignition system, and tested complete heating cycle. System now operating within manufacturer specifications with normal flame pattern and appropriate temperature rise.
Conducted evaluation of HVAC system showing significant winter damage with outdoor unit completely obstructed by heavy snow accumulation, compromising airflow and operational efficiency. Inspection of interior components revealed existing plumbing connections with insulated piping and PVC drainage that will require proper integration during replacement. Recommended full system replacement to restore heating and cooling functionality with properly sized equipment and improved installation configuration to prevent future weather-related failures.