
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 routine A/C tune-up and system inspection as part of recurring membership maintenance visit. Verified proper airflow and temperature differential at supply register, measuring 54°F discharge temperature, and inspected outdoor condenser unit for proper operation and clearance. All components functioning within normal parameters with no issues identified during service.
Completed prepaid membership cooling maintenance visit. Inspected and verified air filter condition, noting previous service date marking of 3-12. Measured supply air temperature at 55.7°F using calibrated digital thermometer to confirm proper system operation and cooling performance. All equipment operating within normal parameters.
Conducted comprehensive estimate for complete HVAC system replacement including furnace and air conditioning unit. Existing AC system experienced failure and requires full replacement along with aging furnace equipment. Assessed current mechanical room configuration, existing ductwork system, electrical panel capacity, and utility connections to determine specifications for new equipment installation.
Completed scheduled cooling system maintenance on residential Lennox outdoor condensing unit as part of prepaid membership program. Performed comprehensive tuneup including system inspection, cleaning, and performance verification to ensure optimal operation for the cooling season.
Completed full HVAC system installation including new furnace and air conditioning unit. Charged refrigerant to manufacturer specifications using calibrated scales and verified proper system pressures with digital manometer, confirming static pressure reading of 1.74 inches water column within acceptable range for optimal airflow and equipment performance.
Completed scheduled cooling system maintenance visit as part of prepaid membership plan. Performed comprehensive air conditioning tune-up including refrigerant pressure diagnostics using manifold gauge set, temperature differential measurements across evaporator coil, and visual inspection of outdoor condensing unit components. All system parameters found within normal operating specifications, with unit functioning properly upon completion of preventive maintenance service.
Installed thermostatic expansion valve (TXV) on residential air conditioning system per approved estimate. Connected refrigerant lines to new Danfoss TXV assembly with proper brazing techniques, verified sight glass operation, and performed system diagnostics with manifold gauges to confirm proper refrigerant flow and system pressures upon completion.
Evaluated existing 15+ year old heat pump system with failed compressor located at residential property. Unit showed signs of age-related deterioration and compressor failure, making repair economically unfeasible. Exterior condensing unit and indoor air handler assessed for replacement specifications. Documented existing installation including electrical disconnect, conduit routing, and concrete pad placement. Interior mechanical room inspection revealed moisture concerns on concrete floor, indicating potential condensate drainage issues requiring attention during replacement. Provided comprehensive replacement estimate for complete heat pump system to restore heating and cooling functionality to the residence.
Conducted furnace replacement estimate in residential basement utility area. Evaluated existing beige furnace unit with overhead silver ductwork and white PVC condensate piping, documenting current system configuration and mechanical room layout for complete HVAC system replacement proposal.
Completed warranty replacement of HVAC control board. Removed failed control board and terminal connector block from equipment housing, installed new replacement control board, and reconnected all electrical wiring including multi-conductor control wiring. Verified proper system operation with thermostat cycling cooling mode correctly, displaying 80°F current temperature with setpoint at 75°F. System restored to normal operation.
Completed full HVAC system installation including new high-efficiency furnace and air conditioning unit in basement location. Installed furnace with integrated humidifier system, connected all supply and return ductwork with proper metallic transitions and sealed joints, and mounted outdoor condensing unit with refrigerant line connections. All equipment properly positioned, leveled, and secured per manufacturer specifications with electrical connections completed and system tested for proper operation.
Responded to service call for newly installed air conditioning system that was not operating properly. Diagnosed and corrected wiring issues at both the equipment control board and thermostat to establish proper communication and system functionality, resulting in successful system startup and operation.
Performed comprehensive air conditioning tune-up on Carrier outdoor condenser unit, including system inspection, performance testing, and filter evaluation. Inspected two HVAC air filters showing standard wear patterns and assessed outdoor unit accessibility, noting vegetation growth around condenser that may require clearance to maintain optimal airflow and system efficiency.
Responded to no cooling complaint on Carrier split system. Upon arrival, diagnosed thermostat thermal lockout which had caused the air conditioning system to shut down. Reset thermostat and verified proper system operation. Inspected outdoor condensing unit and indoor air handler, confirming both components returned to normal cooling mode. System tested and operating within manufacturer specifications at time of departure.
Responded to service call for MagicPak unit with reported refrigerant leak. Upon arrival, coordinated with homeowner regarding pets prior to beginning work. Inspection revealed significant corrosion and oxidation on copper refrigerant line with visible leak at connection point. Due to severity of leak and system integrity concerns, unit was shut down to prevent further refrigerant loss and potential compressor damage. Documented condition with photos showing corroded copper piping with rust patina and deteriorated coupling seal. Also noted heavily soiled air filter requiring replacement during future service. Unit remains offline pending parts procurement and repair under existing 5-year parts and 1-year labor warranty coverage.
Completed comprehensive air conditioning tune-up on residential Lennox condenser unit. Performed standard maintenance procedures including system inspection, cleaning of condenser coils and fan assembly, verification of proper refrigerant levels, electrical connection testing, and operational assessment. Unit found in satisfactory working condition with all components functioning within normal parameters.
Responded to no cooling complaint on residential system installed in 2021 and covered under 10-year parts warranty. Upon arrival, confirmed unit was running but not producing cool air. Performed diagnostic evaluation and determined system was low on refrigerant charge. Connected manifold gauges and verified insufficient charge levels. Evacuated remaining refrigerant, conducted leak search, and recharged system to manufacturer specifications using calibrated digital scale to ensure proper refrigerant weight. System tested successfully with proper cooling operation restored upon completion.
Conducted on-site HVAC system evaluation for equipment replacement estimate. Assessed existing older model furnace and air conditioning system with distinctive turquoise-colored cabinet configuration installed in basement utility area. Documented current equipment condition, ductwork configuration, electrical connections, and spatial constraints through photographic documentation to support replacement proposal and system sizing requirements.
Responded to service call for tanked water heater with pilot light that would not remain lit. Cleaned thermal coupling during initial troubleshooting attempt, but issue persisted, indicating likely failure of the thermocouple or gas control valve requiring further diagnosis or component replacement.
Completed comprehensive AC tune-up service on outdoor condensing unit. Connected manifold gauge set to measure refrigerant pressures and verify system performance within manufacturer specifications. All system parameters checked normal and unit operating efficiently.