When it comes to maintaining a comfortable and functional home in Southeastern Wisconsin, Thielmann Heating, Cooling, and Plumbing has been the trusted name since 1929. With decades of experience serving our customers, we’re dedicated to providing top-notch services tailored to the unique needs of Lake Geneva residents. Whether you’re facing a leaky faucet, need a new furnace, or require a complete air conditioning overhaul, we’re here to help. Experience why so many have trusted us by calling (262) 315-3067 or contact us online now to get started.
Expert Lake Geneva Plumbing Services

From minor leaks to major installations, our skilled, local plumbers are ready to tackle any challenge your home throws your way. Here’s what we offer in our Lake Geneva plumbing services:
- Water Heater Services: Whether you need a new water heater installed or an old one repaired, we’ve got you covered. We specialize in both traditional and tankless water heaters.
- Pipe Repairs and Replacements: Leaky or corroded pipes can cause significant damage. Our team of Lake Geneva plumbers quickly resolves issues to protect your home.
- Fixture Installations: Need a new sink, faucet, or toilet? We provide expert installation to upgrade your home’s functionality and style.
Reliable Air Conditioning Services in Lake Geneva
When the summer heat strikes, a reliable air conditioning system is a must. Thielmann Heating, Cooling, and Plumbing offers a full range of cooling services in Lake Geneva to keep your home comfortable:
- AC Installation and Replacement: We’ll help you choose the right air conditioning system for your home, ensuring it is energy-efficient and tailored to your home’s cooling needs.
- Air Conditioning Repairs: Our Lake Geneva HVAC technicians are trained to handle all kinds of AC issues, from refrigerant leaks to malfunctioning compressors.
- Ductless Mini-Split Systems: Ideal for homes without ductwork, these systems provide efficient cooling with minimal disruption.
- Indoor Air Quality Solutions: Enhance your home’s air quality with services like air duct cleaning, dehumidifiers, and advanced filtration systems.
- Routine Maintenance: Regular tune-ups keep your AC system running efficiently and help prevent costly breakdowns.
Heating Services for Lake Geneva Homes
Keeping your home warm during Wisconsin’s chilly winters is crucial. Our comprehensive Lake Geneva heating services ensure that your home stays comfortable and functional no matter how low the temperature drops. Here’s how we can help:
- Furnace Installation and Replacement: Whether you’re upgrading an old unit or installing a furnace for the first time, our team will help you select the right model and ensure a flawless installation.
- Heating System Repairs: From strange noises to insufficient heating, our technicians are equipped to diagnose and fix any issue with your system.
- Boiler Services: We offer installation, maintenance, and repairs for boilers, ensuring reliable heating for your home.
- Heat Pump Solutions: Energy-efficient and versatile, heat pumps are a great option for year-round comfort. We handle installations and repairs to keep your system running smoothly.
- Maintenance Plans: Regular maintenance prolongs the life of your heating system and ensures peak performance. Our maintenance plans are designed for your convenience and peace of mind.
Commercial Services for Businesses in Lake Geneva

In addition to serving homeowners, Thielmann Heating, Cooling, and Plumbing proudly provides expert comfort solutions for businesses in the Lake Geneva area. We understand the unique needs of commercial properties and are committed to helping you maintain a safe, comfortable, and efficient environment for your employees and customers. Our commercial services include:
- Commercial HVAC Installation and Repair: From small offices to large commercial buildings, we design and service HVAC systems to ensure optimal performance and energy efficiency.
- Plumbing Solutions for Businesses: Whether you need new installations, repairs, or routine maintenance, our team can handle everything from commercial-grade water heaters to restroom fixtures.
- Preventative Maintenance Plans: Regular maintenance is essential for commercial systems to minimize downtime and avoid costly repairs. We tailor maintenance plans to suit your business needs.
Why Choose Thielmann Heating, Cooling, and Plumbing?
We understand that your home is your sanctuary, and you deserve services you can trust to give you the peace of mind you deserve. Here’s why Lake Geneva residents can rely on Thielmann Heating, Cooling, and Plumbing:
- Experienced Professionals: Our technicians are highly trained, licensed, and dedicated to excellence.
- Customer-Centered Approach: We prioritize your needs and ensure clear communication every step of the way.
- Comprehensive Services: From HVAC and plumbing to electrical work, we’re your one-stop shop for home services.
- Satisfaction Guarantee: Your satisfaction is our top priority, and we stand by the quality of our work.
Contact Us Today
Ready to experience the Thielmann Heating, Cooling, and Plumbing difference? Whether you’re planning a new installation, need a repair, or just want to learn more about our services, we’re here to help. Contact us today to schedule an appointment or request a free estimate by calling (262) 315-3067.
Let Thielmann Heating, Cooling, and Plumbing be your partner in keeping your Lake Geneva home or business safe, comfortable, and efficient year-round.
Recent Jobs and Reviews in Lake Geneva, WI
Lake Geneva, WI at a glance
Thielmann Heating, Cooling & Plumbing has completed 20 jobs in Lake Geneva, WI between June 2026 and October 2026.
The most recent job was on October 16, 2026.
Thielmann Heating, Cooling & Plumbing has completed 64 jobs in Lake Geneva, WI in the last 12 months.
Job Locations and Reviews
Serviced an InSinkErator Badger 1 (1/3 HP) garbage disposal that was jammed by a foreign object lodged in the grinding chamber. Inspected the unit and under-sink connections, cleared the obstruction, and freed the impeller assembly to restore normal rotation. Verified proper operation and drainage with no leaks at the mounting assembly or discharge connections.
Removed and replaced the existing horizontal gas furnace with a new Carrier unit, set on blocks in the crawl space, reusing the existing filter rack and thermostat. Replaced the existing 2" PVC vent/intake piping with 3" PVC, terminated through the exterior wall, and connected the condensate drain to the condensate pump. Electrical connections were completed under permit, and the old furnace was removed from the site for return to the manufacturer.
Completed comprehensive furnace tune-up and dehumidifier maintenance as part of recurring membership heating visit. Inspected Lennox HVAC system including control unit, ductwork connections, and all mechanical components; verified proper operation of all switches and indicators. All equipment found to be functioning within normal parameters with no issues requiring immediate attention.
Responded to no heat call on furnace that was cycling to first stage then shutting off. Upon arrival, performed diagnostic inspection of heating system. Removed front panel and accessed internal components including blower assembly, control board, and ignition system. Inspected all electrical connections, gas valve operation, and flame sensor condition. Verified proper operation of inducer motor and confirmed exhaust venting was clear and unobstructed. Tested system through complete heating cycle, confirmed furnace now operating normally through all stages. System restored to full heating operation.
Responded to no-heat call on 9-year-old Aire-Flo furnace. Upon inspection, diagnosed failed inducer motor preventing unit from initiating heating cycle. Removed defective inducer motor assembly, sourced and installed replacement component, and restored furnace to proper operation with successful test cycle confirming heat output.
Completed estimate for furnace replacement in crawlspace accessible via cellar door on west side of home. Inspected 15-year-old Carrier unit with two failed heat exchangers, one previously replaced. Documented existing HVAC system including metal ductwork, support structures, and equipment layout through photos. Coordinated arrival via phone communication and assessed replacement options for non-operational furnace system.
Responded to service call for water accumulation beneath furnace unit. Upon inspection, diagnosed failed furnace gasket as source of water leak. Replaced defective gasket with OEM Carrier replacement part #338806-401 to restore proper seal and eliminate water leakage. Verified repair, confirmed no active leaks, and returned unit to normal operation.
Completed comprehensive gas furnace tune-up and preventative maintenance as part of membership cooling visit. Inspected all furnace components, electrical connections, and ductwork; verified system operation and safety controls functioning properly. No issues identified during inspection; unit operating within manufacturer specifications.
Completed comprehensive furnace tune-up and safety inspection. Performed combustion analysis using flue gas analyzer, confirming system efficiency at 91.9% with oxygen levels at 9.6%, carbon monoxide at 42 ppm, and stack temperature at 107.4°F. Inspected all internal components including gas valve assembly, blower motor, electrical connections, and wiring harnesses, verifying proper operation and safety compliance.
Completed comprehensive tune-up service on high-efficiency boiler system, two gas furnaces, and F100AA air filtration system with pad replacement. Performed full system diagnostics including inspection of control boards, wiring connections, and temperature sensors on all units. Replaced two furnace filters and installed new humidifier pad to ensure optimal air quality and system efficiency.
Conducted on-site assessment for installation of sewage ejector pump system and dual sump pump configuration with battery backup capability. Evaluated existing sump pit conditions, including current pump setup, discharge piping, and pit liner integrity to determine requirements for upgraded primary and backup pump installation.
Completed furnace tune-up maintenance and replaced #35 water panel humidifier pad. Inspected air conditioning evaporator coil and performed coil rinsing to remove accumulated dust and debris between fins. All HVAC system components operating properly following maintenance completion.
Completed installation of a 50-gallon short tank water heater (model PV12-4) in residential utility closet. Performed full system hookup including copper supply line connections with brass fittings, PVC drainage and temperature-pressure relief discharge piping, and proper tank securing with mounting straps. Installed associated components including expansion tank and verified all connections for proper operation and leak-free performance.
Conducted on-site evaluation for water softener installation estimate. Assessed existing plumbing infrastructure, including dual water heater system with control unit and copper piping configuration in mechanical room. Documented current setup and determined optimal installation location and connection points for proposed water conditioning system.
Completed routine membership cooling system maintenance visit. Performed comprehensive inspection of outdoor condensing unit including electrical disconnect, refrigerant line insulation, and associated conduit work. Inspected indoor air handler components and return air grille, noting dust accumulation on filter mesh requiring attention during preventative maintenance protocol.
Responded to gas company-marked leak on valve in basement plumbing system. Upon inspection, identified small gas leak at valve connection point on aging copper gas line with visible corrosion. Repaired leak at valve assembly, performed pressure test to verify system integrity, and confirmed no additional leaks present in accessible piping.
Performed standard air conditioning tune-up and system evaluation. Connected manifold gauge set to measure refrigerant pressures and verify proper system operation. All components inspected and system found to be operating within normal parameters.
Replaced two corroded outdoor spigot shut-off valves with new ball valves to restore proper water control and prevent leaks. Updated plumbing connections within wall-mounted access panel, ensuring all supply lines and fittings were properly secured and operational.
Diagnosed non-functional outdoor hose bib and associated shut-off valve. Inspection revealed failed interior shut-off valve with corroded copper piping connections within cabinet enclosure. Replaced defective shut-off valve assembly and repaired exterior hose bib mounting at foundation level, addressing water staining on siding caused by previous fixture failure. Tested system for proper operation and verified leak-free connections at all points.
Conducted comprehensive on-site evaluation for complete HVAC system and water heater replacement. Assessed existing electrical panel capacity and circuit breaker configuration to ensure adequate power supply for new equipment installation. Inspected aging gas piping infrastructure showing significant corrosion and oxidation, documented current system conditions, and provided detailed replacement recommendations for furnace, air conditioning unit, and water heater within the requested arrival window.