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) 315-3067 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) 315-3067 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) 315-3067 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) 315-3067 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) 315-3067 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
Hartford, WI at a glance
Thielmann Heating, Cooling & Plumbing has completed 20 jobs in Hartford, WI between September 2026 and October 2026.
The most recent job was on October 6, 2026.
Thielmann Heating, Cooling & Plumbing has completed 553 jobs in Hartford, WI in the last 12 months.
Job Locations and Reviews
# HVAC No Heat Service Call Responded to no heat complaint on residential HVAC system. Upon arrival, performed diagnostic inspection of furnace unit. Removed access panel to examine internal components and electrical systems. Visual inspection revealed significant corrosion and rust deterioration on metal framework and base platform, indicating prolonged moisture exposure. Multiple wire harnesses and circuit boards were examined for proper connections and functionality. Documented equipment condition through photographs showing corroded metal surfaces contrasting with operational electrical components. Blower motor assembly and control boards were inspected. System evaluated for safety concerns related to deteriorated metal components and potential impact on electrical systems. Equipment shows signs of extended service life despite being under ten years old, with environmental factors contributing to accelerated deterioration of metal components.
Completed scheduled prepaid heating maintenance visit on residential furnace system. Performed comprehensive inspection of air handler unit, including blower motor assembly, internal mechanical components, and ventilation system. Verified proper operation of condensate drain lines and PVC vent piping connections. Inspected refrigerant lines and insulation integrity. All systems found operating within normal parameters and unit left in proper working condition.
Installed a 50-gallon Bradford White electric water heater (Model BBUS4A737IRE41) at the service location. Unit was picked up from Ferguson supply house, delivered to site, and successfully installed per manufacturer specifications with warranty documentation completed.
# HVAC Service Report Responded to no heat call on residential furnace system. Upon arrival, removed access panels and performed comprehensive diagnostic evaluation of unit. Conducted electrical testing using multimeter to verify power supply and circuit integrity throughout the system. Inspected internal wiring, control board, and all electrical connections for proper operation and safety. Identified issue preventing heat operation and completed necessary repairs to restore full heating functionality. Verified proper operation of all safety controls and confirmed unit cycling correctly. Reinstalled access panels and left system in proper working order.
Performed diagnostic service on Whirlpool water softener experiencing complete drainage failure. Inspected unit installation, control panel functionality, and associated plumbing connections including copper supply and drain lines. Documented equipment condition and utility room configuration with water heater proximity for service records.
Completed comprehensive furnace tune-up including full system diagnostics with multimeter testing of electrical components and circuit board functionality. Verified proper operation of all mechanical components, inspected air filter condition, and confirmed system is operating safely and efficiently within manufacturer specifications.
Completed comprehensive furnace tune-up on residential HVAC system located in basement mechanical room. Performed standard maintenance inspection including examination of blower motor assembly, refrigerant lines, electrical connections, and ventilation components; verified proper operation of all system functions and ensured unit specifications met manufacturer requirements.
Provided estimate for replacement of leaking Rheem Professional model PROE502-RH9150 50-gallon electric water heater located in basement utility area. Prepared detailed materials list including new 50-gallon electric water heater, expansion tank with adapter, CPVC and copper press fittings, and necessary piping materials for complete installation.
Responded to emergency service call for HVAC system evaluation. Conducted comprehensive assessment of existing furnace, humidifier, and air conditioning equipment in basement mechanical room. Provided detailed replacement estimate for heating and cooling system components based on equipment age, condition, and homeowner requirements.
Conducted on-site plumbing estimate for bathroom tub/shower fixture replacement and kitchen faucet installation. Assessed existing chrome tub spout and shower control valve showing significant rust staining and mineral deposit buildup at wall penetrations, indicating potential water intrusion and need for fixture replacement. Reviewed new kitchen faucet assembly with pull-down spray hose, supply lines, and counterweight system for installation estimate.
Responded to service call for non-functioning thermostat. Upon arrival, found Badger brand programmable thermostat displaying 59°F with system set to cooling mode in manual operation. Inspected unit, verified display functionality, and assessed thermostat programming and wiring connections to restore proper operation.
Completed standard HVAC tune-up service on system. Technician brought replacement filter for unit and performed routine maintenance procedures. Customer was provided with promotional service offer information during visit.
Conducted on-site assessment of existing fuel oil furnace system in basement of 1900 sq ft, 2-story single-family residence to provide replacement estimate. Current furnace unit approximately 18 years old, installed circa 2006, located in basement mechanical area. Inspected existing equipment configuration including air handler, ductwork connections, and associated HVAC components. Documented system layout with photographic evidence showing control module, wiring harness, galvanized ductwork with foil insulation, and mounted humidifier unit. Noted moisture condensation present on foam insulation surfaces within equipment compartment. Evaluated existing infrastructure including plumbing lines, gas connections, electrical service, and available space for replacement equipment installation. Provided comprehensive replacement estimate for new fuel oil furnace system suitable for heating requirements of 1900 sq ft residential structure.
Responded to service call for kitchen faucet malfunction and dishwasher water supply issues. Upon arrival, performed diagnostic assessment of the kitchen plumbing system. Identified that the existing kitchen faucet was failing and causing inadequate water flow, which was subsequently affecting the dishwasher's ability to fill properly during its cycle. The dishwasher was shutting down mid-cycle due to insufficient water pressure and volume reaching the appliance. Recommended replacement of the kitchen faucet to restore proper water delivery to both the sink and connected dishwasher supply line. Documented existing conditions with photographs of the kitchen sink area and exterior hose bib for service records.
Conducted estimate for replacement of 16-year-old Kenmore model 153.339762 water heater with 48-gallon capacity that is actively leaking. Customer requested upgrade to 60-gallon unit to accommodate increased hot water demand. Assessed existing installation including copper supply lines, exhaust venting, pressure relief valve configuration, and floor drainage. Documented current unit condition with photographs showing leak evidence and utility room layout. Provided recommendations for new water heater installation including proper venting requirements, code-compliant pressure relief valve discharge piping, and expansion tank evaluation.
Replaced gooseneck single-handle kitchen faucet with chrome finish fixtures, including side sprayer attachment and soap dispenser. Installed new supply lines and P-trap assemblies for double-basin sink configuration. Customer also reported water softener and iron filter system cycling nightly between 9:59-11:00 PM, which appears to be operating on its programmed regeneration schedule.
Completed comprehensive furnace tune-up on residential gas heating unit, including full system inspection, cleaning of burner assembly and flame sensor, filter replacement with customer-supplied filters, and verification of proper venting through PVC exhaust pipes. Tested blower motor operation, checked all electrical connections, and confirmed system is operating safely within manufacturer specifications. Unit passed all safety checks and is ready for the heating season.
Completed full tune-up maintenance on residential HVAC system in basement utility area. Performed comprehensive system diagnostics using Testo 310 combustion analyzer to verify proper operation, efficiency, and safety parameters. Customer provided replacement filter for installation during service visit.
Completed preventive maintenance tune-up on residential gas furnace system. Performed comprehensive inspection of unit, ductwork, and connections; verified proper operation of all components; and documented system condition with photos for service records.
Completed scheduled heating system maintenance visit as part of recurring membership agreement. Performed comprehensive inspection of furnace components including blower motor assembly, gas valve operation, electrical connections, and control board functionality. Utilized digital diagnostic equipment to verify system performance parameters and operational readings. All components found operating within normal specifications with proper wire connections and no visible deterioration noted.