
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) 299-6197 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) 299-6197 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) 299-6197 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) 299-6197 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) 299-6197 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) 299-6197 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) 299-6197 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
Job Locations and Reviews
Completed installation of new air conditioning condenser unit and evaporator coil at residential property. Positioned outdoor condenser on concrete pad against exterior wall with proper clearances, installed condensate drain safety switch with wiring routed through metal plenum, and verified all electrical connections and refrigerant lines are secure and operational.
# HVAC Furnace Installation Completed residential furnace installation in basement utility area. Installed new heating system with integrated ductwork assembly featuring galvanized sheet metal pentagonal trunk line for optimal airflow distribution. Connected copper refrigerant lines and configured system alongside existing Rheem water heater. Performed comprehensive system pressure testing using digital manifold gauge, verifying proper refrigerant pressures at 130 PSI on both high and low side ports to ensure system operates within manufacturer specifications. All mechanical connections secured, ductwork properly sealed, and system commissioned for reliable operation.
Completed full HVAC system replacement including installation of new high-efficiency furnace in basement mechanical room and matching outdoor condensing unit. Furnace was positioned on existing concrete pad with proper clearances, connected to white PVC venting system for intake and exhaust, and integrated with existing ductwork distribution system. Outdoor condensing unit was set on level concrete pad with appropriate drainage, electrical disconnect box mounted to exterior wall with PVC conduit for line set protection, and all refrigerant lines properly insulated and secured. System was pressure tested, evacuated, charged to manufacturer specifications, and cycled through multiple heating and cooling operations to verify proper function of all components including blower motor, compressor, and safety controls.
Completed comprehensive plumbing inspection of residential kitchen and basement utility systems. Examined under-sink garbage disposal installation, verifying proper mounting, electrical connections, and PVC drain configuration, as well as basement water supply system including main distribution lines, shut-off valves, and mechanical equipment connections. All components found to be properly installed and functioning within normal parameters.
Completed comprehensive HVAC system replacement estimate for residential property. Assessed existing outdoor condenser unit currently protected with seasonal cover and evaluated electrical service capacity by inspecting main distribution panels in basement utility area. Documented equipment location, electrical infrastructure, and site conditions to develop specifications for new system installation including proper electrical requirements and outdoor unit placement considerations.
# HVAC Service Report Responded to service call for Wood Heat by Lennox air handler system. Performed diagnostic inspection of unit with cabinet access panel removed to assess internal components across all three compartment levels. Inspected heat exchanger assembly, blower housing, electrical control board, transformer, and associated wiring systems throughout upper, middle, and lower sections. Verified proper connections of multi-colored electrical wiring including power and control circuits. Evaluated condition of motor assembly and control components in lower compartment. Unit showed normal operational wear with dust accumulation on internal surfaces. Documented system configuration and current operating condition through photographic records for service history.
Completed routine furnace maintenance and filter inspection. Removed and examined the existing 14x25x1 air filter, which showed minimal contamination and remained in serviceable condition. Filter housing and frame components were found to be secure and properly seated within the HVAC system, ensuring optimal airflow and system efficiency.
Completed scheduled HVAC maintenance on an International Comfort Products gas furnace, model GGMVE080T71GA (80,000 BTU input capacity, manufactured October 2013). Documented unit specifications and verified AHRI certification status as part of the prepaid maintenance visit.
Completed installation of Carrier furnace unit (Model: SBLRMAM02MUN1Y11G, Serial: 5M2535L955) in basement utility area. Unit was positioned and secured with proper clearances maintained from stored items and existing HVAC ductwork, all electrical connections completed, and system tested for proper operation.
# HVAC Install - Complete System ## Summary Completed full HVAC system installation including outdoor Carrier condenser unit with electrical service components and indoor mechanical equipment with associated connections and controls. ## Work Performed **Outdoor Equipment Installation:** Installed Carrier brand air conditioning condenser unit on prepared black concrete pad against exterior brick wall. Positioned unit to ensure proper clearance and accessibility for future maintenance. Mounted electrical disconnect box and meter socket on brick wall with white electrical conduit running vertically to service the outdoor unit. Secured all electrical connections per manufacturer specifications and local electrical codes. Verified proper grounding and bonding of all electrical components. **Indoor Equipment Installation:** Installed cylindrical mechanical equipment in basement utility area with proper clearance from walls and surrounding structures. Connected multiple refrigerant lines
Performed comprehensive tune-up and inspection on Carrier HVAC system, including examination of all internal components, electrical connections, control boards, and blower assembly. Verified proper operation of all mechanical systems, checked condensate drainage lines, and confirmed secure mounting of all wiring harnesses and safety controls.
Completed comprehensive HVAC system evaluation for residential forced-air furnace and air handler replacement in basement utility area. Assessed existing beige furnace unit with curved gray supply ductwork, examined electrical panel capacity and circuit breaker configuration to ensure adequate power supply for new equipment installation, and documented current system layout including insulated duct runs and mechanical connections for replacement specifications.
Completed comprehensive tune-up service on residential furnace system in basement mechanical room. Performed standard maintenance protocol including inspection of heat exchanger, burner assembly, and blower components; verified proper operation of all safety controls and limit switches; checked and documented ductwork connections and condensate drainage system. All equipment operating within manufacturer specifications with no deficiencies noted at time of service.
Responded to commercial toilet maintenance call and performed internal tank inspection and component assessment. Removed tank lid to evaluate flushing mechanism, which revealed significant mineral buildup and discoloration throughout tank interior indicating extended service life. Inspected float ball assembly with plastic arm mechanism and blue base component for proper operation. Assessed tank condition showing brown water staining and mineral deposits concentrated around waterline and mechanical connection points. Documented existing flush valve system and chrome flush handle operation. Tank components showed age-related wear but remained functional. Verified toilet positioning and surrounding fixtures in commercial restroom environment with proper mounting and stability.
Completed comprehensive HVAC system replacement estimate for residential property. Assessed existing furnace unit located in basement mechanical room and evaluated current ductwork configuration, including main trunk lines and vertical distribution sections. Documented exterior utility connections and meter locations to determine optimal equipment placement and necessary modifications for new system installation.
Completed installation of residential water heater system in basement utility area. Installation included proper connection of copper supply lines, mounting and integration of blue expansion tank with brass fittings, and installation of insulated piping for hot water distribution. All connections were secured according to manufacturer specifications, with PVC drainage/ventilation system positioned appropriately and shutoff valve installed for system control.
Completed water heater replacement in basement utility area. Removed existing unit and installed new cylindrical water heater tank with proper venting system, including galvanized metal ductwork with elbow joint extending through ceiling joists. Connected copper supply lines, gas piping with shut-off valve, and integrated all plumbing connections to existing infrastructure, securing pipes to wooden joists with appropriate strapping and supports.
Completed comprehensive estimate for complete HVAC system replacement at residential property. Evaluated existing outdoor condensing unit positioned against exterior brick wall with current electrical disconnect and conduit routing, as well as interior electrical panel and distribution system in basement utility area. Assessment included documentation of existing equipment placement, electrical service configuration with dual-column circuit breaker panel, and current ductwork installation to provide detailed replacement specifications and equipment sizing recommendations for new high-efficiency heating and cooling system installation.
Completed warranty inspection of newly installed HVAC system in basement mechanical room. Verified proper installation of main trunk ductwork, supply plenum, and air handler unit with all components secured according to manufacturer specifications and local building codes. Documented installation quality through photographic records showing ductwork transitions, support systems, and equipment placement meeting warranty requirements.