
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) 315-3067 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) 315-3067 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) 315-3067.

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
New Berlin, WI at a glance
Thielmann Heating, Cooling & Plumbing has completed 20 jobs in New Berlin, WI in October 2026.
The most recent job was on October 30, 2026.
Thielmann Heating, Cooling & Plumbing has completed 417 jobs in New Berlin, WI in the last 12 months.
Job Locations and Reviews
Performed diagnostic evaluation of a Comfortmaker gas furnace for a reported condensate pump malfunction, inspecting the condensate drain line, PVC vent and intake piping, and collector box assembly. Verified the pump and associated drain tubing were properly routed and in serviceable condition, with no visible damage, corrosion, or frost on the unit or its connections.
Responded to a no-heat call on a mid-efficiency gas boiler over 10 years old. Inspected the boiler cabinet, control module, aquastat/gauge, gas valve, burner assembly, and associated low-voltage and line-voltage wiring, noting loose, cluttered wiring in the control area. Performed diagnostics on the ignition and control circuit to identify the cause of the heat loss and documented the equipment information and system condition for the service record.
Responded to a slow-draining bathroom vanity sink and inspected the drain assembly, including the chrome tailpiece, slip-joint connection, and PVC P-trap, to clear the restriction and restore proper flow. Verified drainage by running water through the basin, and noted corrosion on the floor-penetration flanges and supply shutoff escutcheons under the cabinet for future monitoring.
Performed seasonal tune-up on furnace and air conditioning system. Conducted a gas line tightness test using a digital manometer, removed and inspected the burner access panel and flame sensor/igniter assembly, and noted heat discoloration on the panel insulation and a slightly clouded sight glass. System inspected, cleaned, and tested for proper operation.
Performed an on-site evaluation of a Mitsubishi mini split system reported as non-repairable and assessed the interior bedroom and exterior patio areas to determine suitable replacement and alternative heating and cooling options. Reviewed potential indoor head and outdoor condenser placement, noting the existing baseboard heat and sufficient wall space and clearance for installation, with no visible damage or obstructions at either location. Customer was presented with replacement and alternative system options for consideration.
Performed a seasonal tune-up on a gas furnace (installed 2019), inspecting the burner assembly, gas valve, blower motor, and wiring connections for proper operation. Noted condensation on the exterior of the flue pipe, indicating a possible venting or exhaust temperature concern that should be monitored or evaluated further.
Evaluated the installation of a new gas line to serve a pool heater and outdoor grill. Inspected the existing basement piping, including corroded steel pipe and a wall stub-out, as potential tie-in points. Mapped an approximately 15-foot exterior route across gravel and dirt grade to the equipment pad, and documented the pathway and existing fittings for material takeoff and proposal preparation.
Performed an on-site estimate for replacement of the existing 91% AFUE furnace and air conditioning system, with the customer requesting standard-efficiency Lennox and Carrier equipment options. Inspected the existing installation, including the ceiling cavity access and steel supply piping, and evaluated the insulated garage/workshop space to determine equipment placement and installation requirements for the replacement system.
Installed a new exterior hose bibb and ran copper supply piping from the existing line through the crawlspace cavity to the exterior wall, using soldered joints, a branch tee with an isolation valve, and a securely clamped horizontal run. Insulated the supply piping within the wall cavity to protect against freezing and confirmed the new hose bibb is properly mounted and operating with no leaks.
Assessed the installation of a 50-gallon Bradford White water heater, including connections to the existing copper supply piping, gas line with shutoff valve, and flexible flue vent. The system includes a mounted expansion tank with brass fittings and valves, and no visible leaks, rust, or damage were observed on the equipment.
Performed a complete furnace tune-up, inspecting the gas valve assembly, igniter/flame sensor, wiring harness, and blower motor assembly. Verified secure wiring connections and component integrity, with no signs of rust, breakage, or damage found. Unit data plate and serial information were documented, and the furnace was left in good operating condition.
Performed a scheduled furnace tune-up under the recurring maintenance agreement, inspecting the burner and gas valve assembly, blower motor, control board, and wiring, as well as the intake and exhaust venting. Noted corrosion on the upper burner compartment, rust staining on the middle compartment floor near the blower, and loosely bundled wiring, and recommend further evaluation of the corrosion and moisture source.
Performed on-site evaluation and provided estimates for water heater replacement and additional water line repair. Inspected the utility room's existing equipment, including the pressure tank with copper piping, pressure switch and gauge, the water treatment tank with digital control head, and the large blue sediment filter with insulated supply piping showing wear and loose insulation. Documented system conditions with photos to support the replacement scope and recommended water line repairs.
Installed a new collector box, pressure switch, and integrated furnace control circuit board under manufacturer warranty, verifying all components were new and undamaged prior to installation. Reconnected wiring and pressure tubing, confirmed proper system operation, and completed a furnace tune-up as part of the recurring maintenance visit.
Performed a diagnostic inspection of the sump pump system, which had not been previously serviced, to verify operational condition. Inspected the discharge piping assembly, including the cleanout wye, PVC couplings, and the transition to the rusted pipe section at the sump basin cover, and observed the pit interior and flexible corrugated connection for obstruction or defects. Documented corrosion and buildup on the fittings and recommended further evaluation or maintenance as needed to ensure reliable operation.
Installed a new upright gas furnace with a new thermostat, reusing the existing filter cabinet and adapting the new unit to the existing solid-core PVC venting. Reconnected the supply plenum and ductwork, set the furnace on elevated concrete blocks, and wired the control components, with permit obtained and electrical work completed. Unit is operating properly, with warning and rating labels, installation documentation, and the Honeywell control in place.
Performed a prepaid furnace tune-up on a gas-fired upright furnace, including visual inspection of the cabinet, venting, and ductwork connections with no signs of damage, corrosion, or leaks noted. Conducted a gas line tightness test using a digital manometer, monitoring pressure over a 10-minute test period to verify system integrity. Unit was left in good operating condition.
Diagnosed a leak at a corroded galvanized section of the waste stack, where rust staining was found at a slip-joint nut fitting near the sanitary tee and transition coupling to PVC drain piping. Inspected the adjacent cast iron drain lines, hub couplings, and cleanout for additional deterioration or seepage, and documented the affected fittings to support recommended repair of the failing galvanized waste components.
Assessed the existing 40-gallon gas water heater, which has a leaking shut-off valve at the top of the tank, and prepared an estimate for replacement with a 50-gallon gas atmospheric (gravity-vent) unit. The scope includes a new thermal expansion tank with arm, a 3/4" press ball valve, a 1/2" gas valve, and 3/4" Type L copper press fittings and piping, with the existing vent connection and pipe insulation to be reviewed and reinstalled during the changeout.
Inspected the bathroom vanity and evaluated the plugged faucet spout, the bathroom fixture shutoff valves, and several outdoor faucets requiring new gaskets. The angle-stop valves and braided supply lines beneath the sink showed no visible leaks or corrosion, and the drain assembly appeared intact, with mineral staining noted around the basin drain. Scope of work was assessed for the spout clearing, shutoff valve service, and outdoor faucet gasket replacement.