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 comprehensive tune-up on customer's furnace system, including inspection of internal components, electrical connections, and ductwork. Cleaned blower assembly and verified proper operation of control board and safety switches. Checked and cleaned PVC venting system to ensure proper exhaust flow. All systems tested and confirmed to be operating within manufacturer specifications.
Performed comprehensive inspection of HVAC system in utility area, examining PVC condensate drainage lines and galvanized sheet metal ductwork connections. Verified proper ventilation flow and checked mechanical components for functionality, ensuring all systems are operating within specifications for the upcoming season.
Responded to no heat complaint on newer residential HVAC system. Inspection of utility area revealed issue with expansion tank and circulation system. Serviced the yellow valve assembly on primary piping network and verified proper operation of the WATTS expansion tank. System was restored to normal heating function after adjustments to the boiler connections and circulation components.
Installed new Capri water softener/filtration system in utility area, connecting to existing copper plumbing with appropriate shut-off valves. Set up complete drain line configuration using PVC piping and connected system to electrical supply. Tested system operation to ensure proper functionality.
Completed routine tune-up of HVAC system and identified moisture issues in the utility area. Inspected PVC drainage pipes which were found to be properly installed with no visible damage or leaks; however, noted standing water on concrete floor near electrical cables which requires further investigation to prevent potential hazards and system damage.
Performed comprehensive tune-up on residential HVAC system, including inspection of furnace interior components, electrical connections, and blower motor assembly. Verified proper leveling of equipment using spirit level to ensure optimal operation and airflow balance. All systems tested and confirmed to be functioning within manufacturer specifications.
Completed installation of a complete HVAC system in residential basement, including a new high-efficiency furnace with PVC ventilation pipes and integrated air filtration component. System was properly mounted, connected to existing ductwork, and all electrical connections were secured according to manufacturer specifications, with final inspection of control board and motor functionality confirming proper operation.
Responded to no-heat call for aging residential furnace (10+ years old). Upon inspection, removed front panel to access internal components and found faulty igniter preventing system startup. Replaced igniter assembly, cleaned flame sensor, and inspected heat exchanger through viewing port. System now operating correctly with proper ignition sequence and heat output.
Completed furnace installation with successful system commissioning. Performed pressure testing using digital manometer, confirming proper gas pressure readings of 9.08" WC, which falls within manufacturer specifications. All connections were verified and system operation validated prior to completion.
Performed comprehensive tune-up on residential furnace system, including thorough inspection of internal electronic components, circuit boards, and mechanical parts. Utilized diagnostic equipment to test electrical systems and verify proper functioning of all components. Ensured proper ventilation through PVC exhaust pipes and confirmed all connections were secure for optimal system performance.
Performed routine HVAC tune-up service including comprehensive pressure testing using dual port manometer. Readings of 35.7/34.7 inWC and 351/347 pascals were documented, confirming system is operating within manufacturer specifications. All pressure differentials were verified to be within acceptable parameters for optimal system performance.
Performed comprehensive tune-up service on the air handler unit, inspecting the evaporator coil and copper refrigerant lines which were found to be in good condition with no signs of corrosion or leakage. Temperature measurements indicated proper system operation with supply air temperature at 116.5°F, confirming the heating cycle is functioning within normal parameters. All connections were verified secure and the system is operating efficiently.
Completed tune-up service on HVAC system, verifying proper leveling of mounting bracket installation using built-in spirit level. Inspected plumbing connections including PVC, copper, and galvanized steel pipes, confirming all components were properly installed and functioning as designed.
Diagnosed and repaired a no-heat condition on a residential boiler system less than 10 years old. Inspection revealed a faulty circulator pump and clogged condensate line causing system shutdown. Replaced circulator pump, cleaned condensate drain, and verified proper system operation with normal heating function restored.
Performed diagnostic service on Armstrong furnace showing no heat operation. Removed access panel to inspect internal components including control board, gas valve assembly, and blower motor. Identified significant corrosion on electrical connections and wear on multiple components consistent with 10+ year old system. Cleaned electrical contacts, tested ignition sequence, and restored heating function. Recommended customer consider replacement options within next 1-2 heating seasons due to age-related component deterioration observed throughout system.
Inspected Bryant furnace unit with front panel removed for comprehensive system evaluation. Observed exposed control board, internal wiring, and connected ductwork. Noted electrical wiring issue requiring attention where single black wire protrudes through floor with visible rust/corrosion around penetration point.
Responded to no-heat call on newer furnace unit. Diagnosed issue with ignition sequence - observed flame rollout during startup. Removed access panel to inspect components, found inducer motor failing to maintain proper draft. Replaced draft inducer assembly and verified proper ignition sequence with sustained blue flame. System now operating within normal parameters with appropriate airflow and combustion.
Diagnosed electrical issues on aging furnace with clamp meter showing 122.3V. Accessed internal components by removing panels to inspect control board, blower motor assembly, and wiring connections. Identified and repaired faulty wiring in the control circuitry to restore proper heating function.
Completed replacement of existing HVAC system with new equipment including outdoor condenser unit installed on concrete pad and indoor furnace with proper ductwork connections. Installation included all necessary refrigerant lines, electrical connections, PVC venting, and condensate drainage to ensure full system functionality and compliance with manufacturer specifications.
Conducted comprehensive inspection of electrical panel and window installation in preparation for HVAC system replacement. Documented existing electrical infrastructure to ensure proper load capacity for new equipment. Evaluated window placement and structural elements in partially renovated space to determine optimal positioning of replacement HVAC components.