For over 90 years, the team at Thielmann has provided customers in Waukesha, Wisconsin with reliable, top-notch HVAC repair services. From heating and cooling to air quality and installation, we do it all so you can rest assured your home will be in its best condition and your family will be comfortable.
We also know life gets busy—that’s why we offer easy, convenient scheduling. Give our technicians a call at (262) 299-6197 or fill out our online form and someone will get back to you quickly.
Our Professionals Will Keep Your House Comfortable During the Fall, Winter, Spring, and Summer Seasons
The average temperatures in Waukesha, Wisconsin are radically different from winter to summer. Winters are known for being freezing, with some of the coldest months having temperatures in the low 20s. In contrast, the summers are humid, warm, and muggy.
Summer temperatures in Waukesha hit around 75°F but can get up to 90°F. The humidity from the surrounding lakes and rivers makes it feel hotter in the local area. Stay cool in this summer heat, and cozy and warm in the winter, when you work with our team of NATE-certified technicians. We will keep your house habitable throughout each season by helping you maintain your furnace, heat pump, boiler, or central air conditioner.
Air Conditioner Replacement and Installation Services
Sometimes, your air conditioner is on its last leg and the best move is not to repair it but to replace it completely. If this is the case our team of certified technicians is ready to help. With decades of experience in AC installation and replacement, we can handle putting in a new AC unit for you from start to finish.
We also provide heating and cooling services in Waukesha, Wisconsin for the best brands on the market and have flexible, easy financing options so you can stay within your budget.
Air Conditioning Repair Services
Summers in Wisconsin can get muggy and hot. Make sure your home is up for the task of keeping you cool by scheduling air conditioning repair or air conditioning tune-up services.
The best way to ensure your system is ready for summer is by having a technician come over and assess the condition of your air conditioner to confirm if it requires repairs.
Here are some of the components of an AC system we will check to see if it needs repair:
- Evaporator coil
- Compressor
- Condenser coil
- Expansion valve
- Filter
- Fan
We also offer air conditioner installation services for old systems that cannot be fixed. If you notice any weird noises, strange smells, or a lack of cold air, chances are you will need a repair or replacement.
Ductless Mini-Split Services
Homeowners in Wisconsin love ductless mini-splits because they are great for the ever-changing weather, from the frigid winters to the humid, muggy summers. Ductless mini-splits are super versatile and offer both heating and cooling options.
We offer the following mini-split services:
- Installation
- Replacement
- Repair
- Maintenance
- Inspections
Our team offers superior HVAC repair services and is fully equipped to handle any ductless mini-split issues, like refrigerant leaks, compressor problems, drainage malfunctions, frozen coils, electrical problems, blower issues, weird noises, and more.
Furnace Repair and Tune-Up Services
Keep your home warm and cozy for the winter with our reliable furnace repair and tune-up services for local residents in Waukesha, Wisconsin.
We can work on any system you have, like:
- Gas furnaces
- Oil furnaces
- Heat pumps
- Packaged units
- Boilers
Furnace Installation and Replacement Services
We can install gas, oil, or electric systems for your convenience. Whether your old system is on the fritz and you need a furnace replacement, or you have a brand-new property and need a furnace installed, we will take care of it.
Heat Pump System Installation Services
Wisconsin residents also use heat pumps to stay warm in the cold winters. Our NATE-certified technicians specialize providing extensive heating and cooling services in Waukesha and will keep you updated from start to finish on the project.
To receive support with a heat pump installation or heat pump repair, contact or HVAC contractors to receive support. Our technicians have the training necessary to fix your broken heat pump system.
Boiler Installation and Repair Services
Another popular heating system, boilers are a great energy-efficient way to heat your home. We offer HVAC installation, repair, maintenance, and tune-ups on boilers.
If you notice any of the following signs, contact us for boiler repair:
- Insufficient heat
- Foul odors
- Strange noises
- Cold air
- Yellow pilot light
We also offer routine boiler maintenance to expand the longevity of your system and ensure it is fully functional when you need it.
Thermostat Installation, Replacement, and Repair Services
Your thermostat is the remote control for your climate comfort. It controls heating and cooling functions but is often one of the most overlooked components of your HVAC system.
If you begin noticing malfunctions in your HVAC system, before rushing to assumptions that a motor is broken or you need a full replacement, consider your thermostat. We offer thermostat installation, replacement, and repair services.
Commercial Heating Maintenance and Replacement Services
Just like homes, businesses and commercial spaces need to offer a good climate-controlled environment to keep patrons and employees alike comfortable.
If you notice anything off about your business’s HVAC system, call the professionals at Theilmann to receive fast and convenient commercial heating repairs and services. Our 90 years of expertise means we’ve seen it all, not just in residential spaces but in commercial ones as well.
Professional Plumbing Services in Waukesha WI
Thielmann Heating, Cooling, and Plumbing has been serving Waukesha homeowners for over 90 years. Our licensed plumbers handle every type of plumbing issue with precision and care. From minor leaks to full system replacements, we provide clear solutions that keep your home running smoothly.
A plumbing issue can quickly disrupt your day. That’s why we respond quickly and get the job done right the first time. Our technicians inspect your system, identify the problem, and provide straightforward options that fit your needs and budget. We use trusted materials and proven methods to ensure repairs last.
We offer a full range of plumbing services in Waukesha:
- Drain & Sewer Cleaning: Clear out blockages and buildup to restore smooth water flow and prevent future clogs.
- Fixture Repair & Installation: Replace or repair faucets, toilets, and sinks for improved performance and reduced water waste.
- Water Heater Repair & Replacement: Maintain, repair, or upgrade tank and tankless models for steady hot water and better efficiency.
- Water Treatment & Filtration: Remove hard minerals and impurities for cleaner, healthier water throughout your home.
- Water Line Repair & Replacement: Fix damaged pipes or install new water lines to maintain consistent pressure and prevent leaks.
- Sump Pump Repair & Installation: Keep your basement safe from flooding with expert sump pump maintenance and installation.
Homeowners throughout Waukesha trust Thielmann Heating, Cooling, and Plumbing for honest work and dependable service. We take pride in our craftsmanship and commitment to customer satisfaction. When you need professional plumbing you can trust, call Thielmann today and let our experts take care of your home.
Take Back Your Weekends and Worry Less About Cooling and Heating Repairs in Your House
One of the advantages of working with our team of professionals includes having more time to enjoy your free time in Waukesha. While we take care of solving your HVAC problems, you can spend your time out on the town.
Take a stroll around Sanctuary Woods or visit the Waukesha County Historical Society and Museum. Our technicians will quickly inspect and fix your malfunctioning furnace or air conditioner to ensure you have time to enjoy your weekend.
Book a Heating or Cooling Appointment With Our Team in Waukesha
Our team in Waukesha is available any day for heating and cooling services. From boiler repair and heat pump installation to AC maintenance plans and heaters repairs, we have you covered. We also are skilled in air quality and offer duct cleaning, whole-home humidifiers, and other air purification services.
Simply fill out our form online or give us a call at (262) 299-6197 to receive assistance.
Recent Jobs and Reviews in Waukesha, WI
Waukesha, WI at a glance
Thielmann Heating, Cooling & Plumbing has completed 20 jobs in Waukesha, WI between March 2026 and April 2026.
The most recent job was on April 7, 2026.
Job Locations and Reviews
Completed full HVAC system installation featuring a Lennox cylindrical condenser unit mounted on vibration-dampening pad with proper gravel base for drainage and stability. Installed electrical disconnect box with conduit run to unit, routed and insulated refrigerant lines to indoor air handler, evacuated system using vacuum pump to remove moisture and contaminants, and charged system to manufacturer specifications. Performed diagnostic verification using manifold gauges and digital meter, confirming proper refrigerant pressures, temperatures, and system operation across all parameters.
Completed installation of bathroom door stopper hardware on wall adjacent to bathtub fixture. Mounted brass-finished cylindrical door stopper with secure bracket attachment to ensure proper door clearance and protection of porcelain fixtures.
Completed comprehensive HVAC system estimate for full equipment replacement at residential property. Evaluated existing basement furnace installation with current PVC venting system, humidifier integration, and electrical connections, along with exterior condensing unit positioned on concrete paver pad with proper electrical disconnect and line set connections. Provided detailed replacement recommendations for both indoor and outdoor components to upgrade system efficiency and reliability.
Responded to service call back to inspect condensate pump system in mechanical room. Upon arrival, found motor assembly operating but observed moisture accumulation on concrete floor around unit, indicating potential drainage issue or pump malfunction. Verified electrical connections, inspected discharge tubing, and documented equipment condition for further assessment.
Responded to service call for malfunctioning bathtub diverter and tub spout assembly. Upon inspection, found the diverter handle detached and hanging improperly from mounting position, preventing proper operation of the shower/tub fixture. Removed the existing chrome diverter component and spout assembly from the ceiling-mounted configuration. Secured the diverter mechanism back into proper mounting position, ensuring flush installation against the wall surface. Tested the tub spout and diverter functionality to verify proper water flow direction between tub spout and showerhead. Additionally inspected the bathroom sink faucet and noted mineral deposits on the brushed metal finish but confirmed proper operational function of the wall-mounted single-handle fixture and popup drain assembly.
Completed prepaid maintenance visit on Carrier furnace model 59TN6A060V17114, manufactured July 2012. Performed comprehensive system inspection including verification of manufacturer specifications, visual assessment of unit condition, and documentation of equipment operation. All components found functioning within normal parameters, with unit maintaining proper electrical specifications at 115V/60Hz/1-phase configuration.
# Plumbing Estimate – Water Service Conducted comprehensive water service assessment for residential property. Evaluated kitchen plumbing infrastructure including sink drainage system, faucet assembly, and under-counter supply lines. Inspected laundry area water connections serving washing machine, examining hot and cold water supply valves, hose connections, and drain standpipe configuration to ensure proper flow rates and identify potential leak points or code compliance issues.
Completed prepaid HVAC maintenance visit for the system located in the basement mechanical room. Performed standard inspection of the ductwork, verified proper installation of insulation materials on ceiling joists, and checked all accessible HVAC components for proper operation. All systems found to be functioning within normal parameters with no immediate concerns identified.
Completed comprehensive HVAC system evaluation for furnace replacement in residential basement mechanical room. Assessed existing furnace unit with exposed internal components including blower motor assembly, evaluated connected galvanized ductwork and plenum configuration, and inspected attic structural framing to determine accessibility and routing requirements for new system installation.
Installed new PVC condensate drain line assembly on building exterior, routing drainage away from foundation with properly configured elbows and fittings. Secured drain termination points through wall-mounted junction plate and verified proper pitch for gravity drainage. System tested and operational with no leaks detected.
Responded to no-heat call for residential system less than 10 years old. Diagnosed failed ignition sequence on furnace located in basement utility room adjacent to water heater and laundry area. Replaced faulty flame sensor and cleaned burner assembly, restoring proper ignition and heat function. System tested with multiple cycles and confirmed normal operation before departure.
Completed installation of ventilation ductwork in ceiling space, requiring strategic access through ceiling drywall. Installed metal duct connection from main trunk line to exterior wall penetration, ensuring proper alignment and secure fastening to structural joists in the utility area.
Conducted an assessment of electrical panel and basement utility area for HVAC replacement. Documented existing electrical service panel with multiple circuit breakers to determine available capacity for new system. Noted water damage on concrete floor and existing plumbing infrastructure that will need consideration during installation of replacement HVAC equipment.
Installed a complete HVAC system including a new furnace unit with proper condensate drainage in the utility area, connected to PVC ventilation pipes. Mounted and configured a Honeywell digital thermostat displaying 68°F with functional temperature adjustment capabilities, ensuring the entire system operates efficiently.
Responded to no heat call for system less than 10 years old. Inspected dual air handler installation in utility room. Diagnosed failed ignition sequence on primary unit, cleaned flame sensor and verified proper ignition restoration. System now operating within normal parameters.
Performed routine tune-up service on Lennox HVAC system. Conducted temperature differential testing with readings of 118.4°F, confirming proper system operation. Unit cabinet showed normal dust accumulation consistent with standard operation; cleaned exterior surfaces during service.
Replaced damaged thermostat that was partially detached from wall mounting plate. Reconnected existing wiring to new unit and repaired damaged drywall section around thermostat installation area where textured wall material had broken away.
Installed new residential water heater in basement utility area, including proper connection of copper supply lines, installation of expansion tank, and connection to existing metal exhaust vent system. Ensured all plumbing connections were secure and properly fitted alongside the existing Carrier furnace system.
Conducted assessment of existing HVAC system in basement utility area, documenting aging Carrier furnace unit with visible wear and associated ductwork condition. Recommended full system replacement due to efficiency concerns and observed discoloration on adjacent water heater indicating possible ventilation issues.
Performed comprehensive inspection of under-sink P-trap assembly, identifying water staining on cabinet walls and minor rust on mounting bracket. Observed properly connected PVC drain pipes with intact threaded coupling nuts, though wall surface shows signs of previous moisture exposure. Recommended monitoring for active leaks and potential future replacement of affected components to prevent further deterioration.
