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 June 2026 and September 2026.
The most recent job was on September 21, 2026.
Job Locations and Reviews
Responded to ongoing basement flooding issue with active water intrusion that had been previously reported but remained unresolved. Conducted thorough plumbing inspection of mechanical room, examining water heater installation, supply lines, valve connections, and surrounding utility infrastructure. Documented conditions with photographic evidence showing water heater, copper piping, valve assemblies, HVAC equipment, and concrete foundation walls for further assessment and determination of water source.
Provided estimate for complete removal of existing water softener system and proper capping of all associated plumbing connections. Evaluated current installation including control head unit, blue cylindrical tank, and connected water supply lines to determine scope of work and materials required for safe disconnection and termination of plumbing.
Replaced failed inducer motor on residential gas furnace and performed complete system tune-up. Installed new inducer motor assembly, verified proper draft operation, and tested all safety controls. Completed comprehensive maintenance including inspection of gas valve, burner assembly, blower motor, and all electrical connections. Confirmed system is operating safely and efficiently with proper combustion and airflow.
Completed comprehensive tune-up service on commercial furnace and air conditioning system, including installation of 16x25x4 air filter. Performed full system inspection with burner operation verification showing proper blue flame combustion pattern and confirmed all electrical connections, gas valve operation, and thermostat functionality were within normal parameters.
Completed comprehensive tune-up on hydronic heating system with gas-fired boiler. Performed thorough inspection of burner assembly, heat exchanger tubes, circulator pump, expansion tank, and associated piping components. Verified proper operation of all safety controls, checked system pressures, and confirmed adequate water flow throughout the heating loop. All components found to be functioning within normal parameters with no immediate repairs required.
Conducted on-site assessment for complete HVAC system replacement including natural gas furnace and air conditioning unit. Evaluated existing equipment condition, documented current system configuration with outdoor condenser unit and indoor components, and provided comprehensive replacement estimate. Current equipment operational but nearing end of service life, prompting homeowner to obtain multiple contractor quotes for planned system upgrade.
Completed routine cooling season maintenance visit per membership agreement. Performed comprehensive AC tune-up on outdoor condenser unit, including visual inspection revealing moderate rust staining and corrosion on exterior panels. Conducted electrical diagnostics using digital multimeter to verify proper system operation and measure voltage/amperage at service ports. Inspected all accessible components including fan assembly, louvered panels for adequate airflow, and condensate drainage line. Unit operational and functioning within normal parameters upon completion of scheduled preventive maintenance.
Responded to emergency furnace service call and conducted comprehensive system evaluation. Identified multiple operational issues requiring repair and provided detailed estimate for furnace repairs. Additionally assessed ductwork system condition and provided separate estimate for duct cleaning services. Documented existing HVAC infrastructure including main supply ductwork, electrical panel circuit configurations, and mechanical room layout through photographic documentation.
Completed annual AC tune-up on 8-year-old cooling system with no reported issues. Performed comprehensive inspection of outdoor condenser unit, verified proper refrigerant pressures using manifold gauges, checked electrical connections and conduit, and confirmed system operation. All components functioning within normal parameters; 2-year-old furnace and thermostat also operating properly with no service required at this time.
Returned to installation site to address register placement. Documented floor register opening dimensions and cavity conditions for proper register fitting. Measured opening to ensure correct register size selection and verified ductwork accessibility for secure installation.
Completed comprehensive furnace tune-up and investigated reported basement noise. Upon inspection, identified temperature anomaly at ductwork measuring 22°F, indicating potential air leakage or insulation deficiency. Inspected basement mechanical infrastructure including PVC drainage system, gas piping with shutoff valve, and exposed ductwork with insulation liner. No immediate mechanical issues found with furnace operation; noise likely attributed to duct expansion/contraction due to temperature differential. Recommended monitoring ductwork insulation and sealing for improved system efficiency.
Performed warranty follow-up refrigerant pressure check and comprehensive leak test on Lennox residential air conditioning system per previous service appointment. System pressures verified within manufacturer specifications, leak test completed with no refrigerant leaks detected, and thermostat confirmed operating properly in cooling mode at 68°F setpoint.
Completed comprehensive tune-up service on residential air conditioning system. Inspected outdoor unit electrical components including capacitor, contactor, and all associated wiring connections, which were found to be in good working condition with no signs of corrosion or damage. Evaluated evaporator coil fins, noting moderate dust and debris accumulation between fins that could impact heat transfer efficiency if not addressed during future maintenance.
Performed comprehensive cooling system tune-up and maintenance inspection on outdoor air conditioning unit as part of recurring membership agreement. Connected manifold gauges to measure system pressures and verify proper refrigerant charge levels, with readings indicating normal operating parameters across both high and low-side pressures. Utilized digital multimeter to test electrical components, measuring capacitance at 35.66 MFD and verifying proper voltage and amperage at contactor and compressor terminals. All electrical connections were inspected and found secure, with no signs of overheating or deterioration. System operational testing confirmed unit is cooling efficiently and operating within manufacturer specifications.
Completed preventive maintenance cooling tune-up on Daikin DX17VSS301AA outdoor condensing unit (model year 2018) as part of recurring membership agreement. Performed standard inspection procedures, verified system specifications and operational parameters, and documented equipment condition with unit showing normal wear consistent with outdoor installation.
Completed scheduled cooling system maintenance visit under membership agreement. Performed comprehensive A/C tune-up on Lennox system, including electrical diagnostics with multimeter showing capacitor reading of 1.8 MFD. Inspected indoor furnace unit and verified proper operation of all components, venting system, and refrigerant lines. System operating within normal parameters with no issues identified.
Completed comprehensive HVAC system replacement estimate for residential basement installation. Assessed existing furnace, air handler, Aprilaire humidifier, and ductwork configuration in unfinished basement mechanical room. Documented current equipment layout including vertical plenum assembly, supply and return ductwork, PVC condensate drainage, and electrical connections to provide accurate replacement specifications and system upgrade recommendations.
Responded to no cooling complaint on 10+ year old system. Connected manifold gauges and performed refrigerant pressure diagnostics while monitoring electrical readings with multimeter showing 4.88 measurement at outdoor condensing unit. System evaluation completed to determine cooling capacity issues.
Responded to no cooling complaint on residential air conditioning system with furnace recently installed five months prior. Performed diagnostic evaluation of outdoor condensing unit and associated components. Unit appeared in good physical condition with proper installation on concrete pad and adequate clearance from building structure. Verified electrical disconnect box present and accessible for service. System evaluated for potential refrigerant issues, electrical faults, or thermostat communication problems common in newly installed split systems where cooling season activation occurs after initial heating-only operation period.
Performed diagnostic on air conditioning system that was running but failing to reach set temperature. Upon inspection, tested capacitor with multimeter and found component operating outside acceptable parameters. Also noted significantly restricted airflow due to heavily soiled return air filter requiring replacement. Identified these issues as primary causes preventing unit from achieving proper cooling capacity.
