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 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.
Conducted visual inspection of basement utility area containing furnace system. Examined exposed PVC vent piping and drainage components for proper installation and function. No active issues were identified with the heating system during this routine service call.
Conducted site inspection of dual outdoor condensing units requiring replacement, documenting their current installation on concrete pads adjacent to gas meters and drainage infrastructure. Interior assessment of mechanical room revealed integration with existing water heater system and associated plumbing, with particular attention to connection points requiring modification during HVAC system replacement.
Performed comprehensive evaluation of existing Carrier WeatherMaker 9200 furnace system. Documented current installation configuration including PVC ventilation/drainage components and existing ductwork connections. Prepared detailed replacement estimate for complete HVAC system upgrade based on observed specifications and structural requirements of the utility room installation.
Conducted comprehensive assessment of basement HVAC system, including air handler unit and associated ductwork. Inspected electrical panel to verify proper circuit capacity for HVAC equipment, noting dedicated circuits for furnace and AC. Documented current installation configuration with photos to facilitate accurate replacement estimate.
Conducted an inspection of existing mini-split system installed in customer's living area. Observed a wall-mounted indoor air handler positioned above a window. Evaluated the electrical panel to verify adequate capacity for the system, noting various circuit breakers including 15A, 20A, and 50A circuits that would support mini-split operation. System appears to be properly installed with no immediate issues identified.
Performed comprehensive inspection of furnace blower assembly. Examined blower motor, fan wheel, electrical connections, and housing for proper operation and integrity. All components found to be in working order with normal operational dust accumulation; no repairs needed at this time.
Inspected residential water treatment system and supply plumbing. Observed significant copper pipe corrosion at brass fitting connections with visible mineral deposits. Documented condition of water heater/pressure tank and existing water treatment equipment (white tank with blue cap) for inclusion in estimate for recommended system replacement.
Inspected and serviced wall-mounted HVAC unit in workshop area, verifying proper connection of ductwork to system. Confirmed all seams and joints in metal ductwork were secure and correctly installed through exposed joists, with particular attention to the curved section and connection points to smaller conduits.
Completed comprehensive inspection of residential hydronic heating system, identifying condensation issues on ductwork and examining circulation pumps for proper operation. Performed necessary maintenance on the boiler unit and associated copper piping network, ensuring all components are functioning optimally with no leaks or pressure irregularities.
Performed comprehensive HVAC tune-up and inspection of system. Verified level installation of critical components using precision spirit level. Inspected PVC condensate drainage piping and connections to ensure proper installation within the mechanical infrastructure, confirming all components were correctly secured to building framework.
Performed diagnostic testing on HVAC system with multimeter, identifying electrical component failure within the air handler. Accessed internal components, tested voltage at control board and motor connections, and replaced faulty relay to restore proper system operation.
Conducted inspection of basement HVAC system including Honeywell electronic air cleaner. Evaluated floor drain setup with connected blue discharge line and examined existing ductwork and PVC/copper piping configuration. Documented current system condition and provided replacement estimate for complete HVAC system upgrade.
Performed routine maintenance on Lennox EL296UH070XE36B-02 furnace system. Inspected PVC venting configuration and connections for proper sealing. Checked electrical wiring and plumbing components, confirming all connections are secure and functioning correctly.
Inspected Bryant furnace unit installed in basement utility area. Unit appears functional with proper ductwork connections and PVC venting. Surrounding area contains numerous stored items that could potentially restrict airflow and access. Recommended replacement due to age and efficiency concerns, with proper clearance of storage items around new installation.
Inspected under-sink plumbing assembly including PVC P-trap, drain connections, and braided supply lines. Verified all components were properly installed and functioning correctly with no visible leaks or damage. Confirmed all coupling nuts and fittings were secure and properly seated.
Performed comprehensive HVAC tune-up including inspection of ductwork and plumbing connections in utility space. Verified proper leveling of equipment using calibrated spirit level to ensure optimal system operation and efficiency.
Performed comprehensive preventive maintenance on customer's HVAC furnace system. Inspected internal components including circuit boards and wiring harnesses, and verified proper operation of all mechanical parts. System is functioning within normal parameters after service.
Performed a routine tune-up on the HVAC system and discovered significant CO readings (7313 ppm) during combustion analysis with the Testo 310 II. Identified water accumulation at the unit base indicating possible condensate drainage issue. System efficiency measured at 80.6% with high excess air (446.9%) and low CO₂ (1.77%), suggesting combustion problems requiring immediate attention to ensure safe operation.
Completed installation of a new residential HVAC system including a beige furnace unit with associated copper lines, electrical connections, and control components in the utility area. System installation included proper connection to existing PVC drainage/ventilation pipes mounted along wooden joists, with all required plumbing and electrical work completed to ensure optimal system function.