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 diagnostic inspection on aging furnace unit, accessing internal components by removing front panel. Examined blower assembly, electrical connections, and drainage system. Observed dust accumulation on components and noted normal wear consistent with unit's age, but all systems appear to be in functional working order.
Successfully installed a new Daikin furnace in the utility room, including proper connection of PVC condensate drain lines and integration with existing ductwork using foil insulation. System was pressure tested with digital manometer and verified to be operating at optimal specifications with zero leakage.
Performed routine preventive maintenance on HVAC system. Conducted electrical diagnostics using SC440 multimeter to verify proper voltage and amperage readings across control circuits. Inspected condensate drain system and PVC piping network for proper installation and function, confirming no leaks or blockages in the drainage assembly.
Responded to No Heat call for furnace less than 10 years old. Performed combustion analysis with Testo 310 II showing excellent efficiency at 96.4% with safe CO readings (17 ppm). Inspected burner assembly and verified proper flame pattern across all three burners, confirming system is operating correctly after service.
Inspected and verified proper installation of standard tank-type water heater. Unit appears to be in good operational condition with no visible leaks, damage or deterioration. Confirmed pressure relief valve and discharge pipe are correctly installed with proper venting and all connections secure.
Completed installation of new furnace system with proper connection of condensate drain line and electrical wiring as documented in photos. Ensured all connections were secure and tested system functionality before completion.
Successfully completed installation of a new furnace system in basement mechanical room, including proper connection of all ductwork and PVC venting components. Unit was secured on concrete floor with appropriate clearances from water heater and other utilities, and all manufacturer specifications were followed during setup and testing.
Performed routine maintenance inspection on Bryant furnace system in basement mechanical room. Checked all connections on PVC ventilation pipes and verified proper installation of metal ductwork. System is operating within normal parameters with no issues detected.
Performed assessment of existing HVAC system showing significant age-related deterioration, including visible corrosion on the housing and worn mechanical components. Recommended full system replacement with new air handler installation, complete with proper ductwork connections and PVC condensate drainage lines. Existing unit's blower assembly and belt system to be replaced with more efficient modern equipment.
Conducted assessment of existing copper piping system in utility area, documenting condition of aged pipes with visible patina and existing connections. Evaluated integration requirements for replacement components with current plumbing infrastructure, including connection points for flexible conduit and protective cage installation needed for safety compliance.
Performed comprehensive tune-up on residential HVAC system, including inspection of interior components (control board, wiring harnesses, gas valve, and motor assembly) and verification of proper PVC venting installation in basement mechanical area. All components showed normal operational wear with no significant issues detected; system is functioning within manufacturer specifications.
Completed installation of a new furnace system in the utility area, connecting the unit to existing ductwork with PVC venting. Properly secured all components, including the metal ductwork and PVC pipe connections, and verified proper clearance between the furnace and adjacent water heater.
Installed complete water treatment system in utility area including primary water heater, blue water treatment tank with digital control head, and wall-mounted expansion tank. Connected system with appropriate copper, PVC, and PEX piping with necessary brass valves and fittings to ensure proper operation. All components were securely mounted against foundation wall with organized pipe routing for optimal functionality.
Performed electrical diagnostics on aging furnace system using multimeter testing which revealed open circuit condition. Identified faulty wiring connections at control board, repaired damaged wires, and restored proper electrical continuity to heating components. Applied additional insulation to exposed heating components to improve thermal efficiency.
Completed main line repair in basement area involving replacement of deteriorated cast iron pipe sections with new PVC piping. Installed multiple connection points and bends in the horizontal run, properly securing new piping to existing structure with appropriate supports. Applied insulation around vulnerable sections to prevent condensation and protect against temperature fluctuations.
Completed installation of new water service system in residential utility area, including connection of water softener ("Calice" model with digital control panel) and integration with existing water heater. System was properly plumbed with all necessary pipes, fittings, and valves to ensure optimal functionality of the home's water distribution system.
Performed inspection of basement mechanical room HVAC system, focusing on ductwork integrity and connections. Examined Aprilaire component installation and verified proper mounting of ventilation unit. Confirmed electrical connections with wire caps were secure and properly terminated on the auxiliary ventilation component.
Inspected Ruud tanked water heater system and adjacent water filtration equipment in basement utility area. Performed routine maintenance on water heater, checking connections and verifying proper operation of temperature and pressure relief valve. Confirmed water treatment system with digital control head was functioning correctly and properly integrated with the water heater setup.
Inspected and documented residential tanked water heater installation. Unit appears to be properly installed with appropriate copper piping connections, functional control valve, and required safety tags. No visible leaks, damage, or deterioration observed in the heater or surrounding plumbing infrastructure.
Performed inspection and estimate for replacement of aging Concord furnace system. Current unit shows signs of corrosion on floor beneath unit, suggesting possible water damage or leakage issues. Recommended full replacement of furnace system including upgrading PVC exhaust/intake ventilation components and ensuring proper gas line connection with appropriate safety valve installation.