
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 May 2026 and June 2026.
The most recent job was on June 10, 2026.
Thielmann Heating, Cooling & Plumbing has completed 233 jobs in Oak Creek, WI in the last 12 months.
Job Locations and Reviews
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.
Responded to no cooling call on aging outdoor condensing unit that failed over the weekend with abnormal noise reported. Upon arrival, found heavily weathered unit with significant rust deterioration on top panel and overgrown vegetation restricting airflow around cabinet. Performed diagnostic evaluation to determine cause of cooling failure and unusual operational sounds. Documented unit condition showing extensive exterior corrosion and lack of maintenance clearance around equipment. Customer notified of findings for repair options on system exceeding 10-year service life.
Conducted on-site assessment of existing HVAC system for furnace and air conditioning replacement. Evaluated current ductwork configuration, including main trunk lines and vertical plenum connections in basement utility area. Documented existing equipment layout, duct transitions, and spatial requirements for new system installation. Provided comprehensive replacement estimate covering removal of old equipment and installation of new heating and cooling units.
Completed full HVAC system installation including new furnace and air conditioning unit. System was properly evacuated to manufacturer specifications as verified by digital vacuum gauge reading of 188 microns, ensuring removal of moisture and non-condensables from refrigerant lines. New thermostat was mounted and programmed for optimal system operation and customer comfort control.
Responded to no cooling complaint on residential HVAC system. Upon arrival, found thermostat set to 71°F but current temperature reading 66°F, indicating system not reaching setpoint. Performed diagnostic evaluation and measured suction line temperature at -1.3°F, confirming severely low refrigerant charge or restriction in system. Outdoor unit coil fins previously cleaned but system still not producing adequate cooling or condensation at evaporator coil, consistent with refrigerant issue requiring further leak detection and repair.
Completed AC system startup and installed ICM soft start module and Red Link thermostat connectivity. Connected Red Link to modem and configured thermostat settings, providing customer orientation on system operation. Installed ICM soft start capacitor on AC unit to reduce compressor startup load and extend equipment lifespan. All systems tested and operating within normal parameters.
Conducted comprehensive estimate for complete HVAC system replacement including natural gas furnace and air conditioning unit located in basement mechanical room, along with full ductwork cleaning services. Assessed existing equipment configuration, electrical panel capacity, ductwork condition, and installation requirements to provide customer with detailed replacement options and scope of work.
Attempted system startup on newly installed air conditioning unit but was unable to complete commissioning due to ambient temperature being too low for proper refrigerant charging and performance verification. Connected manifold gauges and diagnostic equipment to outdoor condensing unit in preparation for startup procedures. Observed indoor thermostat displaying 80°F room temperature in cooling mode with setpoint of 75°F. Will need to return when outdoor ambient temperature reaches approximately 80°F to properly charge system, verify refrigerant pressures, check superheat and subcooling values, and complete full startup checklist per manufacturer specifications.
Responded to service call for air conditioning system not cooling to desired temperature with previous coil freezing issue. Upon arrival, customer confirmed evaporator coil had thawed out since last occurrence. Performed system inspection of both indoor air handler unit and outdoor condensing unit. Evaluated airflow, refrigerant lines, and overall system operation to diagnose cause of inadequate cooling and previous freeze-up condition. Documented equipment condition with photos for service records.
# HVAC Tune-Up Service Completed Performed comprehensive tune-up on HVAC system with diagnostic testing using digital multimeter to verify electrical parameters and temperature differentials across refrigerant lines. All measurements confirmed system operating within manufacturer specifications, with proper voltage readings and temperature splits indicating optimal performance and efficiency.
Responded to callback for air conditioning system not cooling after previous wiring repair. Upon inspection, identified and corrected improper wiring configuration that was causing simultaneous operation of heating and cooling equipment. Verified proper system operation, confirmed condenser unit cycling correctly, and ensured heating and cooling functions operate independently as designed.
Conducted estimate for complete HVAC system replacement at residential property. Assessed existing furnace with failed blower motor resulting in no airflow to conditioned spaces. Evaluated outdoor condensing unit and indoor air handler to provide comprehensive replacement recommendations for both heating and cooling equipment.
Completed comprehensive HVAC tune-up service on residential system. Inspected indoor evaporator coil compartment, noting moderate dust accumulation on finned heat exchanger and debris buildup in drain pan with visible moisture staining. Examined outdoor condenser unit coil fins, which showed dirt and environmental debris accumulation between fin spacing. Documented system conditions with photographic evidence for maintenance records.
Completed seasonal A/C tune-up on outdoor condensing unit, performing standard preventative maintenance procedures including inspection of electrical connections, refrigerant levels, and condenser coil cleaning. Unit operational and running within normal parameters upon completion of service.
Responded to no-cooling call on recently installed AC system. Upon arrival, discovered outdoor unit not receiving power due to disconnected low-voltage control wiring at condenser. Reconnected thermostat wire to contactor, verified proper 24V signal, and tested system operation. Unit fired up successfully with compressor and condenser fan running normally. Confirmed adequate airflow at indoor air handler and proper temperature split across evaporator coil.