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 September 2026 and October 2026.
The most recent job was on October 7, 2026.
Thielmann Heating, Cooling & Plumbing has completed 111 jobs in Mequon, WI in the last 12 months.
Job Locations and Reviews
Completed electrical estimate for backup generator installation. Assessed existing electrical infrastructure in basement area, including current plumbing and drainage systems that will need to be considered during installation. Evaluated ceiling access points and structural pathways for potential electrical conduit routing from proposed generator location to main electrical panel. Documented site conditions and provided comprehensive estimate for generator system installation.
Completed on-site estimate for natural gas furnace replacement and combination furnace/AC system replacement in basement location. Assessed existing HVAC equipment, ductwork configuration with mounted humidifier unit, and electrical service panel capacity to determine appropriate replacement options and installation requirements.
Completed tear out of existing plumbing piping beneath staircase and installed new PVC drain lines with proper fittings and connections in preparation for tile installation. Work included routing pipes through floor joists, securing all connections with appropriate couplings and clamps, and installing floor drain assembly to coordinate with customer's upcoming tile work.
Conducted plumbing estimate for reverse osmosis system installation in basement utility area where customer was having new furnace, air conditioning unit, and water heater installed. Assessed existing copper water supply piping with shutoff valves and evaluated PVC drain line configuration to determine optimal placement and connection points for RO system. Documented current plumbing infrastructure including water supply lines, drainage routing, and available space near existing mechanical equipment to provide comprehensive estimate for system installation.
Completed full HVAC system installation including furnace, air conditioning unit, humidifier, and Bradford White water heater. All work performed with proper permitting and licensed electrician coordination. Water heater installation includes proper venting, copper supply lines, expansion tank mounting, and code-compliant pressure relief valve configuration. System installed in utility area with professional plumbing connections and manufacturer warranty documentation provided.
Responded to no heat call on Lennox furnace system. Upon arrival, diagnosed pressure switch remaining open despite inducer motor operating, indicating failure of inducer assembly. Extensive rust and corrosion observed throughout heat exchanger section and internal components, consistent with age-related deterioration and moisture exposure. Removed and replaced failed inducer motor assembly, restored system to proper operation, and verified pressure switch functionality with unit cycling normally.
Provided estimate for replacement of two natural gas furnaces and two air conditioning units, both systems located in basement. Documented existing electrical panel configuration and photographed main breaker panel to assess electrical capacity for new HVAC equipment installation.
Responded to emergency furnace call and conducted comprehensive system evaluation in residential utility room. Assessed existing gray metal furnace unit with white PVC venting system and connected ductwork, documenting current equipment configuration including air handler, condensate drainage setup, and copper piping connections. Provided detailed replacement estimate for new furnace system installation to address heating system concerns.
Responded to emergency no-heat call for 8-10 year old furnace system. Upon arrival, performed diagnostic inspection of unit and identified failed ignition sequence preventing burner operation. Inspected flame sensor, pressure switches, and gas valve components showing signs of oxidation and normal wear consistent with unit age. Cleaned corroded flame sensor rod, verified proper voltage to control board, and tested all safety switches for continuity. Cycled system multiple times to confirm successful ignition and proper operation of all heating components. Unit restored to full operational status with normal heating cycle established.
Conducted comprehensive estimate for complete air conditioning system replacement at owner-occupied residence. Current outdoor AC unit is six years old with no reported operational issues or symptoms at time of assessment. Evaluated existing system configuration, reviewed equipment specifications including clearance requirements for outdoor condenser unit placement, access panel locations, air discharge clearances, and service fitting connections. Documented ductwork layout and measurements throughout property, noting supply and return configurations serving approximately 1,100 square feet of conditioned space. Measured existing A-coil dimensions and duct runs to ensure proper sizing for replacement equipment. Reviewed low voltage wiring locations, refrigerant line connections including liquid and vapor suction lines, and manifold positions for new installation planning. Photographed technical specifications and created detailed field sketches of current system layout with precise meas
Conducted on-site evaluation for whole-home dehumidifier replacement with capacity requirement of 150-200 pints per day. Assessed existing HVAC system for integration with central air return installation and confirmed compatibility for Nest thermostat connectivity to ensure automated humidity control throughout the residence.
Completed estimate for natural gas furnace replacement located in basement. Assessed existing HVAC control board and gas valve assembly, documented current system configuration including electrical connections and refrigerant lines. Provided replacement options and recommendations for new furnace installation.
Completed preventive maintenance tune-up on gas furnace system and replaced two Air Bear filters (20x25x5). Performed combustion analysis using digital flue gas analyzer, confirming optimal system performance with stack temperature of 112.6°F, oxygen level at 6.2%, carbon monoxide reading of 5 ppm, and efficiency at 92.6%. All readings within manufacturer specifications, indicating proper burner operation and heat exchanger function.
Completed estimate for attic-mounted air handler replacement serving residential HVAC system. Evaluated existing functional but aging unit located in attic space with exposed wooden framework, assessed current ductwork configuration including black flexible ducts, and inspected outdoor Carrier condenser unit mounted on concrete pad against exterior brick wall. Provided replacement recommendations and pricing options for complete air handler system upgrade.
Reconnected bathroom sink plumbing that had been previously disconnected. Verified all P-trap connections were properly secured, tested drainage system for leaks, and confirmed proper water flow through faucet supply lines upon completion.
Conducted on-site assessment for installation of secondary backup sump pump system in residential basement. Evaluated existing primary sump pump configuration, including current discharge piping setup with dual white PVC pipes and electrical components. Reviewed available space in utility area corner for potential backup pump installation and discussed system options to provide redundant protection against basement flooding.
Provided comprehensive estimate for complete HVAC system replacement including a natural gas furnace originally installed in 2013 that has required repeated costly repairs, and an air conditioning condenser unit from 2003 with confirmed refrigerant leak. The existing furnace is located in the basement mechanical room with current venting configuration through PVC piping, while the outdoor condenser unit sits on a concrete pad against the home's exterior siding. Recommended full system replacement to address ongoing reliability issues and eliminate continued repair expenses on aging equipment that has exceeded its serviceable lifespan.
Responded to emergency service call for furnace replacement estimate. Conducted thorough assessment of existing HVAC system, including exterior condensing unit and exhaust/intake PVC piping configuration. Documented current equipment condition and provided comprehensive replacement options to address heating system failure.
Completed HVAC estimate for furnace replacement in basement location. Inspected existing dark gray residential furnace unit with associated ductwork, white PVC venting system, and integrated humidifier mounted to supply duct. Documented current system configuration including furnace positioning on wooden platform, metal plenum connections, condensate drain lines, and beige humidifier unit with electrical connections. Photographed equipment specifications, manufacturer labels, and overall mechanical room layout to provide accurate replacement proposal for aging heating system.
# HVAC No Heat Service Call - 10+ Year Old Unit Responded to no heat complaint on aging HVAC system. Upon arrival, conducted diagnostic inspection of unit interior and control systems. Accessed main control compartment and evaluated primary and secondary control boards for functionality. Inspected electrical connections, relay terminals, and capacitor components. Observed significant rust deterioration on unit base and interior housing, indicating extended service life and moisture exposure history. Examined wiring harnesses with multiple conductor connections to control board terminal blocks. Verified circuit board components including resistors, capacitors, and relay switches for proper operation. Documented existing condition of control boards showing populated electronic components and connection points. Assessed overall system condition noting age-related wear patterns consistent with 10+ year old equipment. Photographed control board assembly and interior compartment for service
