
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
Responded to no-heat call for 10+ year old furnace system. Upon inspection, found significant dust accumulation on internal components requiring thorough cleaning. Thermostat was functioning properly in heat mode but showing 52°F indoor temperature with "Heat On" status, indicating furnace failure to produce adequate heat. Serviced unit by cleaning components, replacing worn igniter, and verifying proper operation with the Honeywell digital thermostat.
Performed scheduled maintenance visit on HVAC system. Conducted electrical diagnostics using Fieldpiece SC680 multimeter, recording voltage readings of 54.21V. Inspected condensate drain line for proper flow and checked refrigerant lines for integrity and appropriate installation.
Performed routine maintenance inspection on HVAC system. Examined internal valve assembly and control board, confirming proper wire connections and component integrity. All electrical connections were secure with no signs of wear or damage to the control mechanism.
Performed scheduled preventive maintenance on Honeywell HVAC system. Accessed and inspected internal components including blower assembly, motor, gas valve, control board, and electrical connections. All systems functioning properly with no issues identified during this prepaid maintenance visit.
Performed routine maintenance on gas furnace system. Conducted electrical diagnostics with multimeter showing 57.15V reading across control board components. Verified proper flame characteristics with strong blue flame pattern indicating complete combustion and correct gas-air mixture.
Performed scheduled preventative maintenance on Honeywell HVAC system. Conducted thorough inspection of furnace components including blower motor assembly, control board, electrical connections, and wire harnesses. System was found to be properly installed and in normal working condition with no visible damage, leaks or anomalies.
Performed gas pressure testing on the HVAC system using a UEI EM201B diagnostic meter, taking measurements at both low and high settings (1503 InWc and 3550 InWc respectively). Verified proper gas flow and pressure readings within manufacturer specifications to ensure optimal system operation and safety compliance.
Performed warranty inspection of Lennox furnace system with connected Honeywell Home thermostat. Verified proper installation of PVC exhaust/intake pipes and confirmed thermostat functionality at 60°F setpoint. Documented system condition with photos for warranty records.
Responded to no heat call for system under 10 years old. Discovered condensate drain assembly with significant corrosion and mineral buildup causing blockage. Replaced damaged condensate trap and cleared drain line, restoring proper system operation and heat function.
Performed maintenance service on HVAC system. Inspected Honeywell Home ProSeries thermostat (functioning properly with heat set to 78°F) and replaced severely clogged air filter which was completely saturated with dust and debris, restricting proper airflow to the furnace.
Performed inspection on residential furnace system, examining PVC exhaust/intake piping and interior components. Inspected control board, blower motor assembly, and electrical connections with front access panel removed. System was found to be operating within normal parameters with proper venting configuration.
Performed comprehensive inspection of split-system HVAC unit, focusing on electrical connections and control board integrity. Opened access panel to examine motor assembly wiring (green/red/yellow/white), verified secure connections, and inspected circuit board for proper function. All components were found in good working order with no issues requiring immediate attention.
Successfully installed a complete HVAC system with a digital control interface mounted on the wall, providing user-friendly access to multiple evaporator options including models CNPV1917, CNPV2M, CNPV2517, CNPV2514, CIV1814, and CNPV3014. System was properly integrated with the existing water heater and utility infrastructure, with all copper lines neatly bundled and secured for optimal performance and aesthetics.
Performed routine scheduled maintenance on gas furnace system. Inspected internal components including blower motor, circuit board, gas valve assembly, and ignition system, confirming all connections are secure and components functioning properly. System is operating within normal parameters with no immediate concerns identified.
Performed routine HVAC tune-up including electrical system diagnostics with voltage readings measuring 288V on primary components. Discovered heavily soiled air filter during inspection and replaced with new filter to improve system efficiency and airflow.
Inspected and documented existing boiler system including expansion tank with proper labeling and associated copper piping network. System features multiple valve assemblies and pressure regulation components mounted to concrete block wall in utility area. All connections appear intact with expected aging patina on copper components.
Performed routine maintenance on Carrier HVAC system including airflow verification testing. Confirmed proper system operation with digital thermostat functioning correctly. Advised customer about upcoming air filter replacement requirement as indicated by thermostat reminder notification.
Performed comprehensive tune-up on residential furnace system, including inspection of blower motor, electrical components, heat exchanger, and gas connections. Removed access panel to conduct thorough examination of internal components and verified all safety mechanisms were functioning properly. System was returned to service in optimal operating condition with all panels properly secured.
Inspected Goodman furnace system during callback service. Verified proper installation of intake and exhaust venting, confirmed all safety labels were intact, and examined overall condition of unit. System appears to be functioning correctly with no visible damage or installation issues.
Performed comprehensive electrical inspection on HVAC system with focus on terminal connections and wiring integrity. Conducted voltage testing using SC680 multimeter, confirming proper electrical values at 0.29V across identified circuits. All connections were verified secure and system operation restored to manufacturer specifications.