
Looking for comprehensive property system services for your home or business in New Berlin, Wisconsin? Thielmann Heating, Cooling, & Plumbing specializes in diverse plumbing, heating and cooling system solutions. We’re a full-service company offering repairs, maintenance, installations and replacements. Plus, we have 24-hour emergency HVAC services for your urgent needs!
Reliable HVAC System Repair, Replacement, & Maintenance Services
New Berlin’s weather can make it challenging to keep your home comfortable. When the temperatures skyrocket or plunge, ensure your HVAC system can handle it.
We are your go-to team for professional air conditioning, furnace, heat pump, and other HVAC services in the local New Berlin, WI area. We have the tools and expertise to get your systems working right so you can enjoy comfortable temperatures throughout your home or business.
Keeping cool in the summer requires a good air conditioner. Whether you need AC repair, replacement, maintenance, or installation services, count on our team to get the job done right.
We work on all types of cooling systems, including:
- Air conditioners: We can work on all models of air conditioning systems for residential and commercial properties.
- Heat pumps: We can repair, replace, or maintain energy-efficient heat pumps that deliver warm air inside and outside the home.
- Ductless mini-splits: We can service ductless HVAC units that provide total climate control for single rooms.
Contact our team at (262) 299-6197 to schedule AC services in New Berlin.

Additional Heating and Cooling Support We Offer
In addition to our HVAC system specialties, we can assist you with various heating solutions and components, including:
Top-Rated Heating System Services
Staying warm during the Wisconsin winter can be a struggle if your furnace, heat pump, or boiler isn’t working perfectly. No matter what is wrong with your HVAC system, we can fix it. Our team offers heating repair, replacement and maintenance services for heating systems like furnaces, boilers and heat pumps. Our professionals will help keep your New Berlin home warm throughout winter.
HVAC Ductwork Services in New Berlin
The air ducts around your home or business are the only link between your HVAC system and your rooms. You’ll have serious system trouble if any ducts are cracked, broken, disconnected, or blocked.
Our company provides comprehensive ductwork services in New Berlin. We offer air duct installation, repair, maintenance and cleaning so you can get the most out of your HVAC system.
For all your ductwork needs, call (262) 299-6197 or contact us online to schedule services today.
Reliable Indoor Air Quality Services
The air in your home can be dirtier than you may think. Dust, debris, and other harmful contaminants could be in your air, leading to respiratory illnesses and HVAC damage. The team at The Thielmann Group offers indoor air quality services, including:
- Air purifiers
- Humidifiers
- Dehumidifiers
Enjoy clean, safe air throughout your home.Schedule indoor air quality services in New Berlin by contacting us online or calling (262) 299-6197.

Commercial and Professional HVAC Unit Services
Commercial properties need top-quality HVAC systems that are made to last. Whether you need service for your system or a new one installed, look to our team for packaged unit services. We work on all brands of commercial-grade packaged HVAC units. Our team also installs packaged units for residential properties, allowing homeowners to have heating and cooling from a single, robust system. These convenient, energy-efficient systems allow for quick heating and cooling.
Trusted Plumbing Solutions for New Berlin, WI Homes
Plumbing issues never come at a good time. Whether you’re dealing with a dripping faucet or a flooded basement, Thielmann Heating, Cooling, and Plumbing provides the professional service New Berlin homeowners rely on. Our licensed plumbers are trained to handle every type of repair, replacement, and installation with precision and care.
From minor leaks to full system upgrades, we handle it all. Our technicians repair broken pipes, unclog drains, and replace worn fixtures that waste water and raise utility bills. If your water heater is struggling, we can repair it or install an energy-efficient model suited to your household. We also offer sump pump maintenance and water filtration systems that protect your home’s foundation and improve water quality.
Why homeowners in New Berlin choose Thielmann:
- Fast response times for urgent repairs
- Clear communication and upfront pricing
- Work completed to meet all local plumbing codes
- Licensed, insured professionals with years of experience
Our full range of plumbing services includes:
- Water heater repair and installation (tank and tankless)
- Drain cleaning and obstruction removal
- Leak detection and pipe replacement
- Sump pump service and installation
- Fixture, toilet, and faucet upgrades
- Garbage disposal repair and replacement
- Water treatment and filtration systems
Your plumbing system should work without worry. Thielmann Heating, Cooling, and Plumbing keeps your New Berlin home safe, efficient, and comfortable. Call today for prompt service or 24/7 emergency support when you need it most.
We Also Offer Water Conditioning Services for Clean, Safe Water
Water conditioning can clean your water, providing health benefits for you, your family or your patrons. We provide the following commercial and residential water conditioning services:
- Water filtration, including specialized carbon, reverse osmosis and sediment filters
- Whole-house filters for clean water flow through all your fixtures
- Iron curtains that eliminate sulfur, iron and manganese from water
- Water softening solutions to decrease unwanted mineral contents of hard water like calcium and magnesium
Introducing one or more of these solutions can improve the longevity of your appliances and clothing, promote better cleaning, decrease rust stains and enhance overall water quality for drinking.
Choose Thielmann Heating, Cooling, & Plumbing in New Berlin for Expert Service
Since 1929, our team has been a go-to choice for top-quality residential and commercial services in New Berlin and beyond. Our NATE-certified technicians can service all HVAC brands, install Lennox-brand units, offer 24-hour emergency care and more. You can also trust our team for extensive plumbing maintenance, repairs and installations. Plus, we offer diverse financing options, upfront pricing, special deals and a job well done. Contact us online or call (262) 384-6407 to schedule your service appointment.
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 New Berlin, WI
Job Locations and Reviews
Completed on-site estimate for air handler replacement in residential property. Accessed ceiling cavity to inspect existing HVAC equipment, documenting current air handler configuration, ductwork connections, and installation conditions. Provided homeowner with replacement recommendations and specifications for new equipment installation.
Completed routine cooling system maintenance visit under residential membership agreement. Performed comprehensive inspection of Hartlaub brand outdoor condensing unit, including visual assessment of cabinet condition, electrical connections, and capacitor operation. Verified proper wire connections at dual-run capacitor with all terminals secure and color-coded wiring intact. Unit operating within normal parameters with no deficiencies noted during inspection.
Conducted on-site assessment of leaking 50-gallon gas water heater in basement utility area. Provided detailed estimate for complete water heater replacement, including removal of existing Rheem unit, installation of new 50-gallon gas water heater with proper venting through existing flue system, and connection to existing copper supply lines and gas piping with code-compliant fittings and pressure relief valve.
Completed comprehensive tune-up service on residential furnace and air conditioning system. Performed refrigerant pressure testing on the AC unit using manifold gauges, confirming proper R-404A refrigerant levels and system operation. Inspected furnace interior components including blower motor assembly, electrical connections, capacitor, and wiring harnesses to ensure all systems are functioning safely and efficiently for the upcoming season.
Completed comprehensive furnace and air conditioning tune-up including thorough cleaning and inspection of all accessible components. Removed access panels to examine internal systems, verified proper operation of blower motor, gas valve assembly, pressure switches, and electrical connections. Documented equipment condition with photos showing HVAC system installation with PVC condensate drain lines, ductwork connections, and internal components including motor assembly and copper refrigerant lines with normal patina development.
Completed estimate for replacement of existing Carrier Infinity air conditioning system and furnace. Customer reported non-functional AC unit but indicated no immediate cooling needs due to current weather conditions. Assessed existing Carrier Infinity HVAC equipment located in basement mechanical room, including furnace with associated ductwork and copper refrigerant lines. Documented equipment condition through photos showing current system configuration, sheet metal ductwork, and installation layout. Provided pricing options for AC replacement as primary need and furnace replacement as secondary consideration based on customer preference for maintaining Carrier Infinity brand equipment.
Completed installation of 50-gallon electric water heater in basement utility area. Unit was properly positioned, copper supply lines and valve connections were installed at top of tank, and all electrical connections were made in accordance with local code requirements. System was tested and verified operational prior to departure.
Installed a 40-gallon standard vent water heater in the basement utility area, including proper venting connections and plumbing hookups. Added a blue expansion tank mounted on top of the unit with brass fittings and valves to protect against thermal expansion and maintain system pressure. All connections were completed to code specifications with appropriate safety valves and shut-offs.
Completed comprehensive AC tune-up service on three outdoor condensing units, performing standard maintenance inspections, cleaning, and system checks. Verified proper operation of associated indoor furnace unit, inspected gas connections, venting systems, and confirmed all safety controls functioning correctly. All equipment operating within normal parameters upon completion.
Responded to no hot water call for electric Rheem water heater displaying error code A109. Upon arrival, diagnosed fault code indicating upper thermostat failure, which prevented the unit from heating water properly. Replaced defective upper thermostat and thermal cutoff switch, reset high-temperature limit, and restored power to unit. Verified proper operation of both upper and lower heating elements, confirmed water temperature recovery, and tested digital control panel functionality. Unit now operating within normal parameters and delivering hot water as designed.
Responded to service call for water heater failure with active leak from bottom of tank. Upon inspection, found 40-gallon natural gas water heater (manufactured February 2018) with severe corrosion on tank bottom and connecting components, including significant oxidation on metallic fittings and elbow joints showing greenish-gray patina from prolonged moisture exposure. Unit deemed non-repairable due to tank integrity compromise. Provided comprehensive estimate for complete water heater replacement including removal of failed unit, installation of new comparable natural gas water heater with proper venting and code-compliant connections, and disposal of old equipment.
Responded to no heat call on Lennox furnace system. Performed diagnostic inspection and system evaluation to identify cause of heating failure. Unit assessed and service completed per standard protocols for residential heating equipment under 10 years old.
Completed preventive maintenance on air conditioning and furnace units during scheduled prepaid visit. Performed comprehensive system diagnostics using digital measurement tools, recording operating pressures and verifying proper refrigerant levels. Inspected electrical connections, wiring integrity, and control components including gas valve assembly and capacitors to ensure safe and efficient operation.
Completed warranty replacement of furnace door safety switch assembly on Daikin residential heating unit. Installed new door switch with mounting bracket to restore proper safety interlock function. Unit tested and verified operational upon completion of installation.
Replaced furnace burner assembly containing five burner heads due to age-related deterioration and discoloration affecting proper combustion. Removed old assembly from manifold, installed new burner unit, and verified proper gas flow and ignition sequence upon system startup.
Responded to service call for Carrier furnace with thermostat tracking issues and condensate pump overflow condition. Diagnosed thermostat communication failure preventing proper temperature control and found condensate pump reservoir at full capacity with standing water. Cleared condensate line obstruction, verified pump operation, tested thermostat wiring and calibration, and restored system to normal heating operation with proper condensate drainage.
Completed comprehensive tune-up service on residential furnace and air conditioning system. Performed system diagnostics on indoor furnace unit including electrical component inspection, circuit board evaluation, and wiring verification. Connected manifold gauge set to outdoor condensing unit to test refrigerant pressures, assess system performance, and verify proper operating temperatures and pressures were within manufacturer specifications.
Conducted comprehensive furnace replacement estimate for residential HVAC system. Performed thorough inspection of existing furnace unit and ductwork, documenting current equipment condition including aging metal cabinet, deteriorating duct connections with visible patching, and overall system wear. Evaluated installation space, existing plenum configuration, and air handler accessibility to determine replacement specifications and equipment sizing requirements for proper system design and installation planning.
Conducted on-site assessment for mini-split installation in recently purchased home currently equipped with boiler heating system and no existing air conditioning. Evaluated basement electrical infrastructure and second-floor bedroom for optimal equipment placement, noting available electrical panel capacity and identifying suitable locations for indoor air handler unit in bedroom space with sloped ceiling configuration.
Responded to emergency call for flooded basement affecting HVAC equipment. Conducted on-site assessment and documented existing water heater and furnace conditions for replacement estimate, noting significant water damage, mineral deposits, and aging infrastructure including corroded plumbing connections and compromised sump pump system.