Thielmann Heating, Cooling, & Plumbing has serviced HVAC systems for Wisconsin since 1929. Our company is built on the foundation of ensuring the comfort of our customers. Our team of experts provides comprehensive and efficient services for your furnace, air conditioner and heat pumps. In addition to heating and cooling services, we repair, maintain, install and replace plumbing components and systems. We’re your go-to home and commercial utility service provider!
Give us a call at (262) 315-3067 or request a free system estimate online.
Furnace Repairs, Cleaning, Replacement and Installation Services
Is your furnace making loud noises when you turn it on? Is it not cooling your house enough on a hot summer day? Needing furnace repairs is the last thing you need in the middle of winter. These are signs your furnace needs repair:
- Lack of heat
- On and off cycling
- Strange noises
- Fluid leaking
Stay ahead of the cold with our furnace repair and cleaning services. Our technicians inspect your unit and address any issues, all on the same day! With years of experience, there are no furnace issues too complex for us to handle.
Furnaces we install
There comes a time when your furnace will reach the end of its life. If your unit is struggling to keep your home warm, it is time for a replacement! At Thielmann Heating, Cooling, & Plumbing, we specialize in installing the best furnaces for homes in Mequon, WI. We install the following furnaces:
- Gas – Popular choice for energy efficiency and cost-effectiveness.
- Oil – Effective alternative if you don’t have natural gas. More frequent maintenance is balanced by stronger heat output.
- Electric – Simple and efficient, providing a longer life span without as much maintenance. Simplicity comes with higher operating costs.
Heat Pump System Repair, Installation and replacement Services
Heat pumps are great alternatives to furnaces. They provide both heating and cooling capabilities with more precise control. Heat pumps act as a flexible alternative to furnaces. The units allow for dual systems for consistent heating and cooling. They offer all-year comfort while being energy-efficient. Over time, however, your system may show some signs warranting a repair:
- System limited to only heating or cooling
- Heating or cooling slowly
- Sparking or smoking from the unit
While common, these issues leave your heat pump needing to be more efficient. Our experts are available for same-day appointments. We offer comprehensive repairs for all heat pump problems.
When is it time to replace your pump?
If you currently own a heat pump, look for signs that it needs a replacement. The signs include the following:
- Frequent repairs
- Energy bill increases
- Inconsistency in the heating and cooling
Our heat pump installations are quick and efficient, meaning you can get back to home comfort faster.
Contact our team to schedule heat pump services in Mequon by contacting us online or calling (262) 315-3067.
Air Conditioner Repair, Maintenance, Installation and Replacement Services
When the hotter temperatures arrive in Mequon, you need a reliable AC unit. A dependable AC unit provides cool, soothing air when the summer comes. Our technicians at Thielmann Heating, Cooling, & Plumbing are dedicated to ensuring the comfort of your home. Unsure of your AC’s condition? Here are some common signs that your AC system requires some AC repairs:
- Unresponsive thermostats
- Unit is 10+ years old
- Loud or strange noises
- Blowing hot air
Our technicians are available for emergency HVAC service. We will remedy any system issues and secure your comfort. We also provide air conditioner installations and replacements if your system needs more than regular AC repairs or maintenance. If you experience constant AC breakdowns, inconsistent cooling or have a system older than 10 years, you should consider a replacement.
Air Purification & Duct Cleaning Services
Quality heating and cooling are essential for your comfort, as is the air you breathe. Poor air quality can result in frequent allergy symptoms, lingering smells, or even dust accumulation. Experiencing these? You may need a professional air purification service.
Our home purifiers eliminate bacteria that stick to the air, creating a more comfortable and healthier home. The air filters in our purifiers clean your air for six to 12 months before they require a replacement. At Thielmann Heating, Cooling, & Plumbing, we extend our services to clearing your air ducts. Your ducts accumulate debris through continual use. Clearing out this buildup makes the air healthier and your HVAC more efficient. Let us ensure your air is of the highest quality for comfortable, healthier living!
Commercial and residential plumbing services we offer
We’ve designed a range of plumbing solutions to help address diverse challenges. Our qualified plumbing technicians can complete the following:
- Repairs: We can fix faulty plumbing, including components like pipes, fixtures, toilets, water heaters and sump pumps.
- Installations and replacements: Our dependable team can set up new plumbing networks or introduce new components to your existing infrastructure. We install sump pumps, water heaters, fixtures and other components. You can rely on us for installations at your new construction site or replacements of your current plumbing solutions. We can even help you with your kitchen or bath remodel plumbing!
- Maintenance: Proper plumbing maintenance is essential to keeping it operating at its best. Consistent preventive maintenance can help prevent major system issues, reduce your spending on repairs or replacements and keep your property running smoothly. Schedule regular maintenance checks with us, and we’ll care for your plumbing network.
- Water conditioning: For clean, quality and safe water, we offer water conditioning, such as softening, filtration and iron curtain installations and maintenance.
Trusted Mequon, WI Plumbing Professionals
Wisconsin homeowners have trusted Thielmann Heating, Cooling, and Plumbing since 1929 to deliver exceptional, quality plumbing services. We understand how fast a plumbing problem can disrupt your entire routine and how quickly a small problem can turn into a major repair. That’s why we pride ourselves on offering fast, reliable plumbing services in Mequon, WI. Whether it’s a broken pipe, garbage disposal service, on installing a new water heater, we have you covered.
With over 95 years of experience, Thielmann has earned a reputation for honest service and quality workmanship across southeastern Wisconsin. We take the time to explain every repair and give you clear, upfront pricing before work begins. You’ll always know what to expect and why the job matters for your home’s safety and comfort.
Our Mequon plumbing services cover every part of your home’s system:
- Tank and Tankless Water Heater Repair and Replacement
- Drain Clearing and Hydro Jetting
- Water Line Leak Detection and Full Replacement
- Toilet, Faucet, and Shower Fixture Repairs
- Garbage Disposal Troubleshooting and New Installations
- Sump Pump Testing and Backup Unit Setup
- Kitchen and Bathroom Plumbing Upgrades
- Whole-Home Water Filtration and Conditioning Systems
If you hear running water, see signs of leaks, or experience poor water pressure, don’t wait. Call Thielmann Heating, Cooling, and Plumbing at (262) 315-3067 for fast, professional plumbing service in Mequon.
We also complete Commercial HVAC Repair & Maintenance Services
Thielmann Heating, Cooling, & Plumbing’s top-quality HVAC services are not restricted to homeowners. We understand that business owners work hard to provide comfort for their customers. Rely on our experts to provide the highest quality inspections and repairs so your business continues to thrive all year.
Our team is ready to handle any maintenance or repairs for your commercial heating or cooling units. Just need a quick repair? Our team is ready for same-day maintenance work. Let us keep your business at the perfect temperature.
Request a free commercial system estimate or schedule an appointment online today!
Relax in Mequon Knowing Your HVAC System is Running Smoothly
Mequon is a vibrant Wisconsin town with plenty to do and explore! Don’t let your HVAC worries prevent you from a great day in the town. Enjoy peace of mind and explore Mequon’s variety of museums. Learn motorcycle history at the Harley Davidson Museum, find striking pieces of art at the Milwaukee Art Museum, and unleash your wild side at the Milwaukee County Zoo.
Mequon’s attractions cater to everyone, but you can’t enjoy them with HVAC worries on your mind. At the Thielmann Group, we want customers to explore what makes this town great. Take in the sights of the Milwaukee River Walk and come back to a comfortably cooled home from a serviced AC unit. Leave the HVAC problems to us!
Ensure Year-Round Comfort in Mequon with Our Plumbing, Heating & Cooling Services
Thielmann Heating, Cooling, & Plumbing’s reliable services enhance households and businesses for peak comfort. We can transform your home into a cozy shelter from Mequon’s extreme weather. Cool your spaces in the town’s 82-degree summers and keep them warm in the chilly winters! You can rely on us for comprehensive and precise heating and cooling system support and extensive, stress-free plumbing. Let our expert team maintain that comfort for you! Request a free system estimate, schedule an appointment online or call us at (262) 384-6407.
Read Reviews From Our Customers
Recent Jobs and Reviews in Mequon, WI
Mequon, WI at a glance
Thielmann Heating, Cooling & Plumbing has completed 20 jobs in Mequon, WI between June 2026 and September 2026.
The most recent job was on September 21, 2026.
Thielmann Heating, Cooling & Plumbing has completed 111 jobs in Mequon, WI in the last 12 months.
Job Locations and Reviews
Disconnected kitchen sink, garbage disposal, and stove in preparation for new countertop installation. All plumbing connections were safely isolated and capped to prevent water damage during the renovation work.
Installed new garbage disposal unit under kitchen sink. Connected disposal to existing drain assembly and PVC P-trap plumbing system. Secured all plumbing connections and verified proper drainage flow. Installation completed successfully with disposal unit operational and tested for functionality.
Installed a 32,000 grain capacity water softener system in the mechanical room. Connected the unit to existing copper supply lines using brass fittings and valves, integrated the system with the home's main water distribution network, and verified proper operation of all inlet and outlet connections.
Provided estimate for replacement of 1-1/2 HP garbage disposal unit with appliance cord and installation using clear silicone sealant. Also assessed leaking dishwasher water supply line requiring repair or replacement.
# HVAC Installation Summary Successfully completed a full residential air conditioning system and evaporator coil installation in basement utility area. Installed new air handler unit with integrated evaporator coil, establishing proper refrigerant line connections using insulated copper tubing. Configured complete ductwork integration including flexible and rigid metal transitions, ensuring proper airflow distribution throughout the system. # Detailed Work Performed Installed complete air conditioning system including new air handler unit and evaporator coil assembly in residential basement location. Positioned and secured main air handler unit with proper clearances for service access and operational efficiency. Mounted evaporator coil within air handler cabinet, establishing refrigerant circuit connections. Ran and insulated copper refrigerant lines from indoor unit to outdoor condensing unit location, ensuring proper sizing and routing per manufacturer specifications. Installed
Completed comprehensive furnace tune-up and system diagnostics as part of recurring heating maintenance agreement. Performed combustion analysis using digital manometer, recording pressure readings to verify proper gas valve operation and heat exchanger performance. Inspected and leveled condensate drain line, confirming proper pitch and drainage function to prevent water backup and system shutdown.
Responded to customer report of condenser making squealing noise. Performed diagnostic inspection of HVAC system including air handler unit and associated components. Inspected refrigerant lines, electrical connections, condensate drainage system, and all mechanical components for proper operation and potential noise sources.
Conducted on-site evaluation for water softener installation in residential property with existing water treatment infrastructure. Assessed current plumbing configuration in crawl space and basement utility area, including copper supply lines, drainage systems, and existing Sterling Water Systems reverse osmosis filtration unit with wall-mounted pressure tank. Documented existing two-tank water treatment system setup and available connection points for proposed water softener integration with current HVAC equipment and water heater installations.
Completed annual air conditioning and furnace tune-up maintenance on residential HVAC system. Installed new Carrier GAPCCAR2025 filter, inspected outdoor condenser unit and indoor air handler components, and evaluated humidifier pad condition showing mineral buildup and scale deposits. All system components tested and operating within normal parameters upon completion.
Installed 18KW Generac generator (model G0072590) with 200 AMP service-rated transfer switch (model 9952) and two 40 AMP load management modules at residential property. Ran 8 feet of 1.25-inch gas line from existing service to generator location and installed unit on concrete pad with cold weather kit. Mounted three 3-foot strut sections with caps for cable management and ran 15 feet of generator cable to transfer switch. Coordinated with electrical contractor for final connections and system integration, obtained necessary permits, and completed installation per manufacturer specifications.
Completed full furnace and humidifier installation in residential basement with all required permits and electrical work coordinated. Installed new HVAC equipment including ductwork connections, gas piping, condensate drainage, and integrated whole-home humidification system with proper venting and code-compliant electrical service. All systems tested and verified operational upon completion.
# HVAC Install - Complete System Completed full HVAC system installation in basement location, including new furnace and air conditioning unit. Installed gray metal furnace system on concrete floor with proper positioning and clearances. Mounted horizontal air handler unit with all internal components, wiring, and mechanical connections completed per manufacturer specifications. Installed white PVC condensate drainage system with multiple sections and joints to ensure proper water removal from the system. All piping secured and routed appropriately to prevent future issues. Opened and configured access panels for system inspection and verification of internal components including electrical connections and mechanical assemblies. Coordinated installation to accommodate permit requirements and electrical work by licensed electrician. System positioned in unfinished basement area with adequate access for future maintenance and service. All ductwork connections completed and integrated
Completed scheduled cooling system maintenance visit as part of membership agreement. Performed comprehensive diagnostic testing of outdoor condenser unit using refrigerant manifold and micron gauge, measuring system pressures, temperatures, and operational parameters to verify proper cooling performance. All readings confirmed system operating within manufacturer specifications.
Conducted estimate for complete air conditioning system replacement at recently purchased residence with non-functional, aged outdoor unit. Assessed existing newer Carrier furnace in basement for compatibility with replacement system and documented current HVAC configuration including ductwork connections. Provided equipment recommendations and replacement options for new AC installation to restore cooling functionality to the home.
Responded to no cooling call on Carrier air conditioning system experiencing high pressure lockout fault. Upon arrival, confirmed unit was shut down on safety with error code indicating excessive discharge pressure. Performed visual inspection of outdoor condensing unit, checking all electrical connections, refrigerant lines, and compressor assembly. Examined wiring harness and control components for proper operation. Verified condenser fan motor functionality and inspected condenser coil for airflow restrictions. All electrical connections were secure with proper wire routing. Unit condensate drainage system with PVC piping was clear and functioning correctly. Cleared high pressure fault and restored system to normal operation. Unit tested successfully with proper cooling cycle confirmed.
Conducted on-site evaluation of existing furnace system in residential basement for replacement estimate. Documented current HVAC equipment configuration including furnace unit, PVC venting system, and air handler plenum. Assessed mechanical room layout, existing infrastructure, and accessibility for future equipment replacement. Provided comprehensive estimate options for new furnace installation to customer.
Completed on-site assessment for replacement of two natural gas furnaces located in basement mechanical room. Both units are over 20 years old and require replacement. Evaluated existing ductwork configuration and electrical connections. Discussed potential air conditioning system replacement as additional consideration for future work. Provided comprehensive estimate for dual furnace replacement project.
Responded to no cooling complaint on unit 5103. Upon arrival, accessed the indoor air handler and inspected the evaporator coil assembly and refrigerant line connections. Performed diagnostic evaluation of the system components, including examination of the refrigerant lines, electrical connections, and control mechanisms. Documented system conditions with photographs showing the insulated suction line, evaporator coil, copper refrigerant piping, and associated wiring. The evaporator coil exhibited dust accumulation on the fins, which can restrict airflow and reduce cooling efficiency. Inspected all visible electrical connections, control wiring, and brass valve components for proper operation.
Responded to service call for California faucet requiring component reinstallation and flow adjustment. Successfully reattached displaced faucet piece and calibrated water flow to proper operating specifications. Faucet restored to full functionality with appropriate pressure and smooth lever operation.
Responded to service call for failed blower motor on natural gas furnace located in basement. Assessed existing HVAC system including basement-installed furnace and outdoor air conditioning condenser unit. Provided comprehensive estimate for complete furnace and AC replacement system due to age and condition of equipment.
