
At The Thielmann Group, our team has been offering reliable heating, air conditioning, and HVAC repair services in Oak Creek, Wisconsin and other areas for over 90 years. Our comprehensive residential and commercial HVAC service ensures that your Oak Creek property is always at the ideal temperature.
Our NATE-certified technicians have the skills and experience to handle any heating or cooling issue and provide service for all brands of equipment, and with our 24/7 emergency services, we are here for you when you need us most.
For superior HVAC service in Oak Creek, trust the team at The Thielmann Group by calling (262) 315-3067 today or contact us online!
Top-Rated AC Services
Our licensed and insured technicians are proud to provide you with outstanding air conditioning (AC) services in Oak Creek, Wisconsin. With our wide range of services, we will work to ensure that you have the cooling power, including:
- AC installation and replacement
- AC repair
- AC maintenance
Ductless Mini-Splits
In addition to forced air, our team provides service for ductless mini-splits. With these unique systems, you’ll get great benefits, including increased energy efficiency, decreased noise, and easy maintenance, all without relying on ductwork in your home.
Heat Pumps
To streamline your HVAC, consider a heat pump. These systems work to both heat and cool your home and can provide exceptional performance with maximum energy efficiency.
Reliable Heating Services
Our comprehensive HVAC and heating services include installation, replacement, repair, and maintenance of a wide variety of popular heating systems, including:
- Gas and oil furnaces: Furnaces are always a popular choice for heating and offer great energy efficiency.
- Boilers: Boilers require less fuel for heating and are cost-efficient while providing quiet and consistent heat.
- Heat pumps: A heat pump does double duty to heat and cool your home and is a highly energy-efficient option.
When you need unmatched heating service, trust the team at The Thielmann Group. Call us today at (262) 315-3067 to schedule services!
Ductwork Services in Oak Creek
Your ducts are responsible for moving heated and cool air throughout your home and are critical to your home’s comfort system.
We offer a variety of duct services to ensure that your home is at the perfect temperature, including:
- Duct cleaning
- Duct installation & replacement
- Duct repairs
- Duct maintenance
Schedule your ductwork service today by calling (262) 315-3067 or contacting us online!

Indoor Air Quality Services
At The Thielmann Group, we understand the importance of high-quality indoor air. With our indoor air quality services, we’ll help ensure that the air you and your family breathe daily is clean and safe.
We offer a variety of systems, including:
- Air purifiers: These systems clean your air using a high-efficiency filter on the air your HVAC system is pushing into your ducts.
- Whole-house humidifiers & dehumidifiers: Moisture balance is critical for fresh air in your home, and with a whole-home humidifier or dehumidifier, you can prevent issues like mold, mildew, dry skin, and snoring.
Don’t delay! Get clean air today by calling (262) 315-3067 or contacting us online today!
Packaged Units Services
Packaged units are all-in-one systems that provide heating and cooling from a single unit. With these systems, you’ll get maximum efficiency with a simple installation and quiet performance. These units are often an ideal choice for smaller homes.
Our services include:
- Packaged unit installation & replacement
- Packaged unit repairs
- Packaged unit maintenance
Interested in a packaged system? Call our team at (262) 315-3067 or contact us online to see if this option is right for you!

Reliable Plumbing Services in Oak Creek, WI
If left unattended, a plumbing problem can quickly go from a minor inconvenience to a major repair. When this happens to you, call Thielmann Heating, Cooling, and Plumbing! Our team of plumbers in Oak Creek have the training, experience, and tools needed to locate and repair any problem with your plumbing system.
We fix everyday problems like dripping faucets, slow drains, and leaking pipes. We also handle larger projects, including full pipe replacements, water heater upgrades, and sump pump installation. Our goal is simple; keep your plumbing system reliable and your home safe from water damage.
The Oak Creek plumbers from Thielmann offer:
- Leak detection and pipe repairs to stop hidden issues before they spread.
- Drain cleaning to clear blockages and keep water flowing fast.
- Garbage disposal repairs or installations to make kitchen cleanup simple.
- Water heater service, repair, or replacement to keep your hot water consistent.
- Fixture installation and repair for toilets, sinks, and faucets that need attention.
- Water filtration and softening solutions for cleaner, better-tasting water.
- Sump pump repairs and maintenance to protect your basement from flooding.
We believe every repair should last. Our licensed plumbers find the root cause, fix it correctly, and make sure you understand the work before we leave. We also perform routine plumbing checks to catch small problems before they become major repairs. For clear pricing, honest recommendations, and lasting results, call Thielmann Heating, Cooling, and Plumbing today at (262) 315-3067 to schedule your Oak Creek plumbing service.
Choose The Thielmann Group in Oak Creek
For unmatched customer service, trust the team at The Thielmann Group. We’re proud to offer residents of Oak Creek superior service from our background-checked, licensed, and insured technicians, and with our upfront pricing, you’ll never get a surprise when it’s time for the bill.
We offer free estimates on replacements and service all brands, and with our available financing options, you can trust that you’re in excellent hands with The Thielmann Group.
Schedule your HVAC service with one of our experts today by calling (262) 315-3067 or contacting us online 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 Oak Creek, WI
Oak Creek, WI at a glance
Thielmann Heating, Cooling & Plumbing has completed 20 jobs in Oak Creek, WI between September 2026 and October 2026.
The most recent job was on October 5, 2026.
Thielmann Heating, Cooling & Plumbing has completed 233 jobs in Oak Creek, WI in the last 12 months.
Job Locations and Reviews
Responded to no heat call for aging wall-mounted heater unit. Upon inspection, found significant dust and debris accumulation throughout the grille and internal components, which was restricting airflow and preventing proper operation. Cleaned and serviced the unit, restoring heat functionality to the system.
Completed installation of residential water heater in basement utility area. Unit positioned centrally with proper clearances from adjacent HVAC equipment and storage areas. Connected copper supply and discharge piping with appropriate valves and fittings per manufacturer specifications. Installed metallic exhaust vent pipe extending through ceiling joists to ensure proper venting of combustion gases. Verified all connections for leaks, confirmed proper operation of temperature and pressure relief valve, and tested unit functionality. Installation meets local building codes and manufacturer requirements for safe operation in residential basement setting.
Responded to service call for non-functioning water heater in residential basement utility room. Conducted on-site assessment of existing short-style water heater with standard copper supply lines and PVC drainage configuration. Documented current installation including plumbing connections, venting system, and clearance specifications. Provided comprehensive replacement estimate for new water heater unit with comparable capacity and dimensions suitable for existing space constraints.
Completed prepaid heating maintenance visit on Carrier system. Verified thermostat operation displaying 68° room temperature with proper communication to equipment. Inspected and documented bent copper refrigerant line requiring attention during service call.
Conducted indoor air quality assessment to evaluate residential humidity control needs and existing humidification system performance. Inspected two-year-old humidifier installation in basement mechanical room, examined HVAC system integration with ductwork, and assessed current humidity management capabilities. Documented equipment conditions and basement environment to provide recommendations for potential dehumidification solutions or system modifications to optimize whole-home humidity control.
Returned to address inspector's corrections on recent HVAC installation. Documented clearance measurements from front of furnace to wall and replaced temporary cardboard flap on return air plenum with proper sheet metal covering per code requirements.
Completed recurring heating system maintenance visit as part of membership agreement. Performed comprehensive inspection of HVAC equipment including examination of refrigerant lines, electrical connections, capacitors, and system components. All equipment found operating within normal parameters with no immediate service needs identified.
Completed full HVAC system installation including new furnace and air conditioning unit in basement utility area. Reused existing zoning system and ERV to maintain multi-zone climate control capability. Installed Ecobee Premium thermostat for first floor zone and Ecobee Lite thermostat for second floor zone to provide independent temperature management for each level. Coordinated with licensed electrician on-site to ensure proper electrical connections and code compliance for all equipment. Configured PVC venting system with proper drainage routing to floor drain. Connected refrigerant lines and gas piping to new equipment. Mounted furnace on platform base with secure anchoring. Verified all safety controls, labeling, and warning placards properly affixed to equipment. System tested and operational upon completion.
Completed prepaid heating maintenance visit on residential HVAC system. Performed comprehensive system inspection and documented equipment conditions with thermal imaging showing supply air temperature of 298°F at air handler unit. Inspected and noted existing Honeywell MERV 11 air filter (16x25x4) with installation date of 7-18-26 and 12-month replacement recommendation. System operating within normal parameters with no immediate service needs identified at time of visit.
Responded to no cooling complaint on dual Carrier furnace HVAC system. Upon inspection, discovered severely corroded exhaust pipe requiring replacement due to structural deterioration and compromised venting integrity. Documented existing conditions with photos showing rust damage and oxidation on copper piping and ductwork components. Coordinated with dispatch for scheduling and customer communication regarding necessary repairs to restore safe system operation.
Completed comprehensive furnace tune-up and system diagnostics. Performed electrical testing using digital multimeter, confirming proper voltage readings at 496V on system components. Inspected air filter bank assembly, verified all pleated filters are clean and properly seated within the diagonal configuration housing, ensuring optimal airflow and system efficiency.
Completed furnace tune-up and safety inspection on residential HVAC system. Performed electrical diagnostics using calibrated multimeter, measuring amperage draw at 0.36A and verifying voltage readings to ensure proper system operation. Conducted temperature differential testing with readings of 56.98°F to confirm adequate heat exchanger performance and airflow. All electrical connections tested and verified within manufacturer specifications, system operating safely and efficiently.
Completed installation of two new toilets in separate bathroom locations per approved estimate. Connected water supply lines to shut-off valves using flexible braided metal supply lines, secured all mounting hardware to floor flanges, and verified proper seating of wax rings to ensure leak-free seals. Tested both fixtures for proper flush operation, fill valve function, and inspected all connections for leaks before completing the installation.
# No Heat Service Call - Furnace 10+ Years Old Responded to no heat complaint on residential gas furnace system. Upon arrival, accessed basement mechanical room and inspected furnace unit and associated components. Opened electrical compartment and examined control board, wiring connections, and capacitor for signs of failure or damage. Verified all wire connections were secure and checked for proper voltage supply to unit. Inspected gas valve assembly and confirmed proper operation. Examined intake and exhaust PVC venting system for blockages or condensate issues. Checked humidifier operation and water supply line. Restored heat to residence and verified system cycled properly through complete heating operation. System returned to normal function.
Performed comprehensive furnace tune-up and combustion analysis using Testo 310 II flue gas analyzer, recording stack temperature of 94.7°F, oxygen level of 8.6%, and carbon monoxide readings of 7 ppm undiluted and 12 ppm air-free, all within acceptable parameters. Verified gas pressure at 53 units using digital manometer to ensure proper fuel delivery and system efficiency. All combustion safety checks passed, and unit is operating within manufacturer specifications.
Completed furnace tune-up and air conditioning tune-up on residential HVAC system. Performed comprehensive diagnostics including temperature measurements of heat exchanger components registering 588°F and electrical testing showing 3769 microfarads capacitance reading using calibrated multimeter. Inspected all system components, verified proper operation of both heating and cooling units, and documented equipment conditions through thermal and electrical analysis.
Completed evaporator coil replacement in attic installation under parts-only warranty coverage. Installed new coil assembly with proper refrigerant line connections using copper piping secured with mounting brackets to existing ductwork. Verified all connections were properly sealed and secured to structural components per manufacturer specifications.
Completed furnace tune-up and air conditioning tune-up on residential HVAC system. Performed comprehensive inspection of electrical components, verified amperage draw at 0.47A, inspected capacitor and wiring connections, and confirmed all components operating within normal parameters.
Completed installation of 80% efficiency boiler system with full permit compliance and coordinated trades. Installation included new copper supply and return piping with brass isolation valves, integration with existing expansion tank, and connection to water heater system. Coordinated with licensed electrician for all electrical connections and power requirements. Milwaukee Chimney installed new 5" stainless steel liner for proper venting per manufacturer specifications. All piping secured and supported to code, system tested for leaks, and unit commissioned successfully with proper combustion analysis and safety checks verified.
Responded to service alert from thermostat indicating unit required maintenance. Performed comprehensive tune-up on HVAC system, inspecting electrical connections, wiring integrity, and component condition. Observed deteriorated insulation on refrigerant line requiring attention and documented existing wire management with bundled connections secured along infrastructure. Reset thermostat service alert and updated maintenance schedule to reflect correct service interval date for future notifications.