
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 comprehensive AC tune-up service on residential cooling system. Performed thorough inspection of outdoor condenser unit, including examination of electrical components such as capacitor and contactor with associated wiring connections, verified proper operation of all mechanical components, and inspected ductwork system interior for cleanliness and structural integrity.
Conducted on-site assessment of residential water heater experiencing active leak causing water damage to floor. Documented existing installation including plumbing connections, PEX distribution manifold, and current drain pan configuration. Provided estimate for complete water heater replacement including removal of failed unit, installation of new water heater with proper venting and connections, and integration with existing radiant heating distribution system.
Completed preventative maintenance cooling system inspection as part of recurring membership agreement. Replaced air filter with new unit and performed electrical diagnostics using clamp meter, recording amperage draw of 19.2A to verify proper system operation and compressor performance.
Responded to gas line repair per approved estimate. Upon arrival, located severely deteriorated and corroded gas piping in basement utility area showing extensive black discoloration and material degradation. Replaced damaged section of gas line with new approved piping and fittings. Tested all connections for leaks using approved methods and verified system integrity. Restored gas service to safe operating condition and confirmed proper operation of all affected equipment.
Performed routine maintenance and tune-up on residential air conditioning system. Conducted electrical diagnostics using digital multimeter, verifying proper voltage and capacitance readings on outdoor condensing unit. Inspected evaporator coil assembly and blower motor, noting moderate corrosion and staining on drain pan that will require monitoring for potential future replacement.
Completed air conditioning tune-up on rooftop HVAC unit. Opened and inspected both rooftop unit and ground-level condenser, finding moderate dirt and debris accumulation on fan assemblies and internal components. Cleaned fan blades, housing, and compressor area, removing outdoor debris and grime buildup from all accessible surfaces.
Performed routine maintenance tune-up on Armstrong outdoor condensing unit. Upon inspection, discovered severely deteriorated condenser coil with extensive fin damage, accumulated debris, and compromised heat transfer surfaces requiring immediate attention. Documented equipment condition with photographic evidence showing significant degradation of coil assembly and surrounding components.
Performed comprehensive diagnostic evaluation of LG mini split system, recording compressor and electrical component resistance measurements to verify proper operation. Successfully replaced failed inducer motor in furnace to restore proper combustion air flow and system functionality. Identified and corrected banging noise in ductwork by securing loose sections and adjusting supports to eliminate operational disturbances.
Completed routine HVAC tune-up and system inspection. Examined and documented the condition of the air filtration system, noting pleated filter with dust accumulation between ridges. Inspected air handler unit with ribbed coil surface, confirming proper installation and overall clean, well-maintained condition of components.
Performed diagnostic evaluation on outdoor condensing unit experiencing catastrophic failure. Upon inspection, found condenser severely deteriorated with physical breakdown of components, excessive oil contamination throughout unit, and structural integrity compromised to the point of material crumbling on contact. Documented unit condition with photographs showing 6-year-old system with premature failure requiring replacement.
Conducted comprehensive indoor air quality assessment of residential HVAC system and mechanical room. Documented existing plumbing connections, water heater installation with brass fittings, and HVAC ductwork configuration in utility area showing signs of previous maintenance work. Evaluated exterior door conditions revealing significant weathering and paint deterioration on door frame that may contribute to air infiltration and compromise building envelope integrity, potentially impacting overall system efficiency and indoor air quality performance.
# Plumbing Service - Inspection Conducted routine plumbing inspection of laundry room area, examining water supply lines, drain connections, and shut-off valves serving two top-loading washing machines. Verified proper installation of supply hoses, checked for signs of leaks or water damage on walls and flooring, and confirmed adequate drainage function. All plumbing components were found to be in satisfactory working condition with no immediate service requirements identified.
Completed installation and system start-up of residential air conditioning unit. Performed refrigerant charging procedures and verified system pressures using digital manifold gauges, with readings showing 110.1 psig on low side and 379.1 psig on high side, along with superheat of 88°F and subcooling of 145°F. Condenser unit properly positioned on concrete pad with appropriate clearances, refrigerant line sets insulated and routed to building, and all electrical connections completed per manufacturer specifications.
Completed installation of residential sump pump system in basement floor basin. Installed black submersible pump unit in existing concrete pit with white PVC discharge piping and electrical connection, secured with metal hose clamp. System tested and operational for basement water management and flood prevention.
Performed warranty inspection and leveling service on HVAC cooling unit. Examined evaporator coil assembly and verified heat exchanger fins were clean and free of debris. Noted condensation present on metal housing, indicating proper system operation. Checked unit level using precision spirit level tool and confirmed proper horizontal alignment of equipment for optimal drainage and performance. All components inspected showed normal operating condition with no defects requiring correction under warranty coverage.
# HVAC Install - System Start Up Completed installation and system start-up procedures for new HVAC equipment. Connected manifold gauge set to service ports and verified refrigerant pressures on both high and low sides of the system. Measured operating pressures using Yellow Jacket diagnostic gauges, confirming readings were within manufacturer specifications for proper system operation. Inspected condenser coil and heat exchanger components for proper installation and clearance. Verified all electrical connections and wiring were secure and properly terminated. System tested and confirmed operational with appropriate superheat and subcooling values achieved.
Completed scheduled HVAC maintenance on residential gas furnace system. Performed comprehensive inspection of internal components including blower motor assembly, gas valve connections, electrical wiring, and ductwork connections. All components found operating within normal parameters; system tested and confirmed functioning properly.
Completed full HVAC system installation including indoor air handler unit and outdoor condensing unit. Installed new air handler in mechanical room with proper copper refrigerant line connections and black insulated line set, integrated silver metallic supply ductwork for air distribution throughout the residence. Mounted outdoor condensing unit on exterior with appropriate clearances from building, installed white PVC condensate drain line with proper pitch and termination, added splash guard at grade level to prevent water pooling. System tested and verified operational with all components functioning within manufacturer specifications.
# Plumbing Install - Outdoor Spigot/Shower Installed new garbage disposal unit beneath kitchen sink, including complete mounting assembly with stainless steel flange connection to sink drain. Connected disposal to existing drainage system using white PVC P-trap configuration and secured all pipe joints. Ran electrical connection from disposal unit to cabinet-mounted outlet and verified proper power supply. Installed black corrugated discharge hose for drainage routing and ensured all connections were watertight and secure.
Completed installation of Lennox furnace unit in residential basement utility space. Unit was positioned on concrete floor with protective foam padding, connected to existing ductwork system including metal supply ducts and white PVC condensate drain lines. During installation, identified existing water infiltration issues at wall-to-floor junction near piping penetrations, evidenced by discoloration and moisture damage to substrate materials. All mechanical connections, venting, and drain lines were properly secured with appropriate mounting brackets and fittings to ensure code-compliant operation.