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 March 2026 and May 2026.
The most recent job was on May 1, 2026.
Thielmann Heating, Cooling & Plumbing has completed 111 jobs in Mequon, WI in the last 12 months.
Job Locations and Reviews
Completed comprehensive tune-up service on gas furnace and air conditioning system. Performed electrical diagnostics using digital multimeter, measuring voltage and amperage readings on HVAC control board and system components to verify proper operation. All systems tested and found operating within manufacturer specifications.
Completed comprehensive HVAC system evaluation for equipment replacement estimate. Assessed existing Carrier furnace unit in basement utility area and outdoor air conditioning condenser unit, documenting current equipment specifications, installation conditions, and system configuration including copper refrigerant lines, PVC condensate drainage, and venting components to provide accurate replacement recommendations and sizing requirements.
Responded to no cooling call for ductless mini-split system in commercial garage space. Upon arrival, performed diagnostic inspection of wall-mounted indoor unit and verified system operation, finding unit functioning properly with no cooling deficiencies detected at time of service.
Completed comprehensive HVAC system estimate for equipment replacement in residential property. Assessed existing heating and cooling unit located in basement utility area, including evaluation of current PVC condensate drainage system, ductwork configuration, and electrical connections. Documented exterior HVAC pad location and clearance requirements along decorative stone wall for potential outdoor condenser unit placement.
Performed comprehensive HVAC tune-up on residential furnace system. Conducted thorough inspection of internal components including blower motor, heat exchanger, ignition system, and control board. Removed front access panels to access both upper and lower compartments, tested electrical connections and circuitry using multimeter to verify proper voltage and amperage readings. Inspected PVC intake and exhaust vent pipes for proper installation and clearance. Examined ductwork connections and insulation throughout basement area, verified all mechanical linkages and wiring harnesses were secure and functioning correctly. All systems tested and operating within manufacturer specifications upon completion.
Completed inspection and documentation of exposed plumbing system featuring copper supply lines and PVC drain lines mounted on basement wall. Verified operation of brass shut-off valves with cross-handle configuration and confirmed proper identification tagging of water supply lines per code requirements.
Completed comprehensive HVAC system replacement in residential basement mechanical room, installing new air handler unit with associated ductwork, drainage piping, and electrical connections. Configured galvanized steel ductwork transitions in attic space with proper sealing and integrated refrigerant line routing to ensure optimal airflow distribution throughout the home. All components installed per manufacturer specifications with condensate drainage system properly positioned and secured for reliable long-term operation.
Completed installation of ductless mini-split air conditioning system in residential living space. Mounted indoor evaporator unit on interior wall at optimal height for air distribution, installed refrigerant line set through wall penetration, and positioned outdoor condenser unit with proper clearances. System was pressure tested, evacuated, charged with refrigerant, and successfully commissioned with all operational parameters verified within manufacturer specifications.
Completed prepaid HVAC maintenance visit on residential gas furnace system. Performed comprehensive inspection of furnace unit, blower assembly, and venting components including PVC condensate drainage lines and exhaust system. Verified proper operation of all mechanical and electrical components, checked wire connections, and confirmed system functionality. All equipment found operating within normal parameters with no immediate service needs identified.
Performed comprehensive evaluation and measurements of existing HVAC system for complete replacement estimate. Assessed current air handler unit dimensions and clearances in mechanical space to determine equipment specifications for new installation. Documented existing Carrier Infinity Touch thermostat system currently displaying operational parameters, which will be evaluated for compatibility with proposed replacement equipment or potential upgrade requirements during system changeout.
# HVAC Install - Complete System Completed full installation of new Lennox air conditioning system at residential property. Positioned outdoor condenser unit on level pad against exterior brick wall, secured electrical disconnect box, and ran proper conduit connections. Performed complete refrigerant charging procedure using manifold gauge set with calibrated pressure readings, evacuated system to manufacturer specifications using vacuum pump, and pressure-tested all refrigerant lines for leaks. Connected and verified all copper line sets with proper brazing techniques and insulation. Commissioned system with full operational testing to confirm proper airflow, temperature differential, and electrical parameters meeting Lennox installation standards.
Performed comprehensive plumbing assessment for water heater replacement, including evaluation of existing infrastructure and drainage systems. Inspected overhead plumbing access point revealing multiple water supply lines and PVC drainage pipes running through ceiling joists, confirming adequate routing for new water heater connections. Examined basement sump pump system with vertical discharge piping to verify proper drainage capacity and ensure compatibility with water heater installation requirements.
Conducted comprehensive assessment of existing HVAC system in basement utility area for complete replacement estimate. Evaluated current furnace unit with exposed internal components, including gas valve assembly, electrical connections, and mechanical systems, documenting equipment condition and accessibility for future installation. Photographed existing ductwork configuration, including vertical metal chase running floor to ceiling, and assessed surrounding workspace conditions to determine material requirements and installation logistics for proposed system replacement.
Completed site inspection of residential property undergoing renovation with exposed wall framing. Assessed exterior utility access point where ground-level panel was removed for inspection of plumbing connections and outdoor spigot mounting. Evaluated interior workspace where walls have been stripped to studs, with multiple measurement points marked for future HVAC equipment installation and ductwork routing. Documented current framing conditions to determine optimal placement for register locations and ensure proper clearances for mechanical system components during the ongoing construction phase.
# HVAC Install - Furnace Job Summary Completed installation of new Lennox high-efficiency furnace system in basement utility area. Unit was positioned on concrete floor against foundation wall with proper clearances maintained for service access and code compliance. ## Work Performed Installed furnace unit with complete venting system utilizing white PVC piping routed through basement ceiling for exhaust and intake air. Venting was properly pitched and terminated according to manufacturer specifications and local building codes. All pipe joints were primed, glued, and secured with appropriate hangers and supports. Connected refrigerant lines along right side of unit using proper mounting brackets to ensure secure routing and prevent vibration. Lines were insulated where required to prevent condensation and maintain system efficiency. Completed all electrical connections from furnace to existing power supply, routing wiring along floor and securing to prevent damage. Verified prope
Performed inspection of existing Carrier furnace system with integrated humidifier in basement utility area. Documented current installation conditions including electrical connections, ductwork configuration, and adjacent plumbing infrastructure. Evaluated replacement options based on observed brick wall construction, existing vertical pipe runs, and available utility connections for optimal new system placement.
Installed ceiling-mounted rail system along interior wall junction, securing metal track to ceiling with appropriate mounting hardware. System appears to be part of a renovation project, possibly for a sliding mechanism or curtain track installation.
Performed routine prepaid maintenance on furnace system. Verified proper leveling of equipment using spirit level and inspected condensate drain lines and electrical connections. Ensured all plumbing components were securely fastened with appropriate mounting brackets and checked for any signs of moisture or drainage issues at the unit base.
Performed inspection of attic-mounted HVAC system, focusing on ductwork condition and connections. Verified integrity of yellow insulation wrap and reflective tape seals on all supply runs. Confirmed proper operation of blower unit mounted on wooden platform and inspected associated electrical connections at control panel.
Conducted a comprehensive inspection of an A.O. Smith water heater system and adjacent blue furnace/boiler unit in the basement utility room. Both units appear properly installed with intact connections to copper, galvanized, and PVC piping infrastructure. Documented the current condition of all equipment and plumbing connections for replacement estimate purposes.
