Your Local HVAC Company since 1929

Thielmann Heating, Cooling, & Plumbing is the trusted choice for all your heating, ventilation and air conditioning (HVAC) and plumbing needs in Waterford, Wisconsin! Our number one priority is customer satisfaction, and we go above and beyond to ensure you receive the best service possible. Give our team a call at (262) 384-6407 to receive assistance with a malfunctioning HVAC or plumbing system or if you need efficient installation or maintenance services.
Waterford Heating Company
Do you need reliable heating services in Waterford? We work hard to provide the best heating products, installation and services in Waterford, Wisconsin.
Our trained professionals are always willing to take on routine and complex projects. Rest assured, we’ve got you covered with prompt, 24/7 service to repair all makes and models. Our heating services include:
- Heating repairs: Few things are as satisfying and convenient as turning on your heater after coming in from the cold. When your heater’s making loud noises, you notice strange odors or you’re not getting enough warm air, we can assist. We’ll drive to your property and repair the issue promptly.
- Heating installations: Trust our HVAC technicians to provide a durable, energy-efficient installation. From boilers to gas and oil furnaces, we can install them all.
- Heating maintenance: Be ahead of unexpected breakdowns. When you sign up for our maintenance program, you can enjoy regular heater checkups and an annual plumbing inspection.

Reliable Cooling Services
Keep your home comfortable and beat the heat with our air conditioner services, which include:
- AC repairs: We have the skills and knowledge to handle any air conditioner issues and will repair your cooling system with care.
- AC installations: If it’s time for a new AC, look to us. We use advanced tools and the latest industry techniques to install your air conditioner safely and according to compliance standards.
- AC maintenance: Annual tuneups can give you peace of mind and save you money in the long run. From clearing the drain line and pan to checking refrigerant levels, we’ll do a thorough checkup for a smooth-running unit.
We service various cooling systems, such as:
- Air conditioners: We can work on all models of air conditioners for residential and commercial properties, including central air conditioning systems.
- Ductless mini-splits: Request installation and maintenance services for ductless mini-split systems, perfect for homes without existing ductwork
- Packaged units: We can handle packaged unit systems for both residential and commercial properties.
- Heat pumps: Get repairs, installation and maintenance for energy-efficient heat pumps that deliver warm and cool air.
Indoor Air Quality Solutions
We understand the importance of clean and healthy indoor environments for homes and businesses. Our comprehensive solutions, including humidity control, air purification and duct cleaning and installation, are designed to enhance the quality of your indoor air.
Your HVAC’s ductwork is like your property’s lungs, ensuring comfort and well-being as heated or cooled air flows through the duct system. Achieve optimal indoor air quality with our comprehensive selection of air purification services in the local Waterford, Wisconsin, area:
Plumbing Services You Can Trust
Whether you’re busy with a complete property upgrade or need smaller plumbing repairs, our technicians can handle it all. No job is too big or too small for us, and we go above and beyond for every customer. If you need reliable, efficient plumbing services in and around Waterford, we’re the local choice you can rely on. Call us for the following plumbing services:
- Plumbing repairs
- Plumbing pipe and fixture installations
- Water heater replacements and repairs
- Hose bib services
- Sump pump services
- Faulty pipe repairs
- Toilet and faucet replacements
- Water conditioning services
- Faulty garbage disposal services
- Bath and kitchen remodels

Contact Thielmann Heating, Cooling, & Plumbing Today
Since 1929, our team has been the go-to choice for top-quality residential and commercial HVAC and plumbing services in Waterford, Wisconsin and beyond. We can service all brands, provide 24/7 emergency HVAC care and more.
We also provide expert plumbing services for homes and businesses, enabling you to enjoy a comfortable property. Rest assured, we have you covered for all your plumbing and HVAC needs! Plus, we offer upfront pricing, financing options, special deals and a job well done.
Contact us online or call (262) 384-6407 today. You can also schedule the services you need.
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 Waterford, WI
Waterford, WI at a glance
Thielmann Heating, Cooling & Plumbing has completed 20 jobs in Waterford, WI in October 2026.
The most recent job was on October 24, 2026.
Thielmann Heating, Cooling & Plumbing has completed 161 jobs in Waterford, WI in the last 12 months.
Job Locations and Reviews
Performed a furnace and A/C tune-up, including inspection and servicing of the heating and cooling systems. Removed the hot surface igniter (HSI) from the furnace for evaluation and testing of the ignition components, and verified the condensate drain line and associated tubing were properly routed.
Performed a tune-up on a Lennox upflow gas furnace. Removed and serviced the flame sensor, inspected the burner assembly and sight glass, and verified secure wiring connections. Visual inspection of the unit, PVC vent piping, condensate drain, and electrical components showed no signs of rust, frost, or physical damage, and the furnace was reassembled and returned to service.
Replaced the garbage disposal and adjusted the drain line, reconnecting the PVC P-trap and tee assembly to the ABS drain with slip-joint fittings and securing the dishwasher drain hose and supply connections. Noted pre-existing moisture staining and deterioration on the cabinet floor beneath the sink, which may indicate prior leakage.
Performed a seasonal tune-up on a Lennox gas furnace, including inspection of the unit, PVC intake/exhaust venting, flexible vent connection, electrical conduit and junction box, and surrounding ductwork. Verified the 16x25 filter size noted on the return and found no visible rust, cracks, or frost damage, with all connections in place and the system ready for winter operation. Noted minor discoloration near an upper PVC elbow for monitoring.
Performed a furnace tune-up with the upper access panel removed to inspect the draft inducer assembly, gas valve, wiring connections, and PVC venting. Conducted combustion analysis on the natural gas appliance with a flue gas analyzer, recording a stack temperature of 96.9°F, O2 at 13.2%, CO at 8 ppm (22 ppm air-free), CO2 at 4.37%, and a steady-state efficiency of 92.4%, indicating safe and efficient operation within normal parameters.
Performed an on-site estimate for an air conditioning system replacement, inspecting the basement-mounted ductwork, refrigerant line set, and condensate drain piping. Existing galvanized supply trunk, insulated refrigerant lines, and PVC condensate drain were found in serviceable condition with no visible frost, rust, or damage. Customer elected to pour the equipment slab before proceeding with the replacement installation.
Responded to a Carrier furnace showing fault code 33 (limit circuit open) followed by lockout on code 13 (limit circuit lockout). Removed the front panel and inspected the blower compartment, venting, wiring, and limit circuit components to diagnose the cause of the repeated limit trips and restored the unit to normal operation.
Performed a furnace tune-up, inspecting the ignition system and removing the igniter/flame sensor probe for evaluation. Conducted a combustion analysis with a Testo 310 flue gas analyzer on natural gas, recording a stack temperature of 102.3°F, O₂ at 11.9%, CO at 8 ppm (19 ppm air-free), CO₂ at 5.10%, excess air at 117.1%, and combustion efficiency of 92.3%. Readings indicate safe CO levels and efficient operation.
Completed a whole-home plumbing inspection, visually assessing accessible supply and drain piping, including copper supply lines, PVC and ABS drain piping with rubber couplings, and fittings through an open ceiling cavity. Noted staining on concrete block walls and dust accumulation on piping, with no active leaks observed in the documented areas, and photographed all inspected components for the service record.
Responded to a no-heat call on a 15-year-old Armstrong A95UH2V furnace where the hot surface igniter would glow but gas never flowed and ignition did not occur. With the front access panel removed, inspected the gas valve assembly and associated wiring harness, and used a multimeter to test for voltage at the gas valve during the ignition sequence to verify valve operation and control signal. Completed diagnostics and service on the ignition and gas delivery components, restoring the furnace to normal operation.
Performed a complete furnace tune-up on an oil-fired heating system, including inspection and servicing of the burner assembly, fuel filter, and oil supply line connections. Verified proper combustion operation and system performance. The oil storage tank, supply valve, and fuel filter were inspected, with no leaks, rust, or visible damage observed.
Performed an on-site diagnostic of a malfunctioning garbage disposal, inspecting the GE disposal unit, its power connection, the ABS discharge line, and the P-trap assembly with slip-joint connections beneath the sink. Documented the under-sink plumbing configuration and condition to support repair evaluation and recommendations.
Responded to a reported gas leak at the furnace and performed a diagnostic evaluation with the gas supply shut off. Used a Testo 310 II flue gas analyzer to sample the surrounding area, recording CO levels of 7 ppm and 0 ppm with ambient O2 readings of 21.9% and 20.9%, indicating no hazardous combustion byproducts present. Noted soot-like discoloration on the closet interior, and the gas supply remains off pending further inspection and repair of the leak source.
Performed diagnostic evaluation of the gas furnace in response to a reported odor on startup, including inspection of the plenum and supply plenum connection, temperature measurements, and electrical checks of blower motor amperage (1.95 A) with a true RMS clamp meter. Documented system condition and applied a service sticker to the unit for future maintenance reference.
Installed a new toilet flange and bathtub drain, including PVC drain and vent piping routed through the framing with proper support. Pipe runs were connected with couplings, tee fittings, and sweeping elbows, and secured with hanger straps to the framing. A cleanout with a threaded plug was provided for future access, and all connections were completed and inspected for proper fit and alignment.
Performed a furnace tune-up, inspecting the blower assembly, flame sensor, and control wiring within the cabinet and checking system operation with a digital multimeter. Cleaned accumulated dust and debris from the cabinet interior and verified connections and components were in proper working condition.
Assessed a failed cast iron toilet flange showing heavy corrosion, rust scaling, and broken flange ring sections, with moisture-related deterioration of the surrounding subfloor and corroded cast iron drain piping visible in the underfloor area. Prepared an estimate to remove approximately 7–8 feet of deteriorated cast iron drain piping and replace it with PVC, including a new toilet flange, and to include the bathtub drain in the same scope of work.
Performed a furnace replacement estimate after diagnosing a failed control board and pressure switch, along with a faulty T10 module. Inspected the air handler, return filter slot, ductwork connections, and electrical service panels to confirm installation conditions. Documented the unit and surrounding components with photos, and noted that the T10 module repair must be included with the installation, with the part ordered in advance so installers can complete it during the replacement.
Responded to complaint of humming noise audible on main level during heating and cooling system operation. Inspected HVAC equipment and identified source of noise transmission through ductwork. Installed vibration dampening component to isolate mechanical vibrations and eliminate noise transfer to living space.
Responded to service call for furnace fan cycling on and off approximately every 10 seconds. Performed diagnostic inspection of the HVAC system, accessed internal components including blower assembly, control board, and electrical connections. Identified and addressed the intermittent fan operation issue to restore proper system function.