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 in May 2026.
The most recent job was on May 19, 2026.
Job Locations and Reviews
Completed scheduled biannual air conditioning tune-up and preventive maintenance as part of recurring service agreement. Inspected system components, documented heavily soiled return air filter and debris accumulation in ventilation grilles requiring attention to maintain optimal airflow and system efficiency.
Completed routine cooling system maintenance visit as part of prepaid membership program. Performed comprehensive inspection of outdoor condensing unit, including examination of evaporator coil fins which were found to be clean and in good condition with proper airflow. Inspected electrical components within control panel, verified capacitor connections and functionality, and utilized CoreSense diagnostic equipment to monitor system performance parameters and ensure all readings were within manufacturer specifications.
Completed plumbing estimate for relocating washer to upper level, which requires installation of new water supply lines and drain piping from existing basement connections. Assessed current piping configuration in utility area and evaluated routing options through wall cavities and floor joists to reach proposed upstairs laundry location. Documented existing galvanized supply lines and drainage infrastructure to determine material compatibility and connection points for the planned installation.
Provided estimate for complete HVAC system replacement including natural gas furnace and air conditioning condenser unit, both currently operational but nearing end of serviceable life with equipment dating from approximately 1995. Assessed existing basement-mounted furnace and exterior-mounted AC condenser unit on concrete pad, documented current system configuration, and presented replacement options to bring heating and cooling systems up to current efficiency standards.
Responded to no cooling call and found ice buildup on the evaporator coil. Instructed customer to turn off system to allow ice to thaw. Air handler located in attic, outdoor condensing unit inspected and photographed showing normal exterior condition with standard condensate drainage components.
Responded to no cooling call on 10+ year old Carrier system. Upon arrival, unit was running but delivering only ambient air with no refrigeration. Diagnosed failed dual run capacitor in outdoor condensing unit. Replaced defective capacitor with properly rated replacement, restoring compressor and condenser fan motor operation. Verified system cooling performance and proper amp draw on all components before departure.
Responded to customer request for second opinion on existing air conditioning system after another contractor indicated problems and disconnected components. Performed comprehensive evaluation of outdoor condenser unit and indoor furnace system located in basement. Documented current equipment condition through photographs and assessed system functionality. Provided detailed estimate for complete AC replacement based on findings from inspection of existing installation, refrigerant lines, electrical connections, and overall system configuration.
Conducted on-site evaluation for residential air conditioning installation in home currently equipped with boiler heating system only. Assessed property for small duct high velocity system installation with attic-based equipment placement. Evaluated interior spaces including bedrooms and living areas to determine optimal supply register locations and system capacity requirements. Documented existing conditions and structural considerations for ductwork routing through attic space. Provided comprehensive estimate for complete high velocity AC system addition to facilitate property marketability.
Performed seasonal start-up and system commissioning on Lennox air conditioning unit. Verified proper operation of condenser fan, checked electrical connections at disconnect box, and confirmed unit stability on mounting pad. System tested and left in normal operating condition.
Completed installation of high-side air conditioning components including new evaporator coil integrated with existing furnace system. All refrigerant lines were properly insulated and routed, electrical connections verified, and condensate drainage system installed per manufacturer specifications.
# Complete HVAC System Installation Completed full residential HVAC system replacement including new furnace, air conditioning unit, and 40-gallon water heater. Installed Lennox outdoor condensing unit on gravel pad with proper clearances from structure. Routed copper refrigerant lines along exterior brick wall using secure mounting brackets and installed electrical disconnect box per code requirements. Modified venting system by installing new PVC exhaust piping routed through existing chimney chase. Integrated SecureAir filtration system and S40 thermostat for enhanced air quality control and system management. Installed AA700 accessory package to complement system performance. Coordinated with licensed electrician for all electrical connections and service upgrades. Obtained all required permits prior to installation. Verified proper refrigerant charge, tested all safety controls, and confirmed system operation across all heating and cooling modes. All equipment installed per man
Completed air conditioning tune-up and system performance evaluation. Connected manifold gauges to measure refrigerant pressures and verify proper system operation. Inspected Lennox furnace unit, checked electrical connections, and confirmed all safety labels and components were in proper working order.
Completed residential furnace installation in basement utility area. New gray furnace unit installed with proper PVC venting routed through ceiling joists for exhaust and combustion air intake. Unit positioned adjacent to existing water heater with appropriate clearances maintained for service access and code compliance. All manufacturer labels and safety documentation affixed to equipment. Electrical connections completed and ductwork integrated with existing HVAC distribution system. Installation includes standard operational and safety features per manufacturer specifications. System tested and verified operational upon completion.
Conducted comprehensive restoration site walk-through and documented property conditions following fire damage. Photographed intact bathroom area showing functional fixtures and existing HVAC considerations, as well as severely fire-damaged structure with compromised roof, exposed framing, and extensive fire retardant contamination requiring full system assessment for restoration planning.
Conducted on-site estimate for replacement of 13-year-old two-stage furnace and air conditioning system located in basement. Performed visual inspection of existing HVAC equipment and assessed rooftop venting infrastructure, noting aged metal flue pipe with significant rust and corrosion requiring replacement during system upgrade.
Completed annual air conditioning tune-up and maintenance inspection. Addressed customer concern regarding humidifier alert light activating intermittently; inspected humidifier system, reset controls, and verified proper operation. Documented condition of return air grille showing dust accumulation and heat exchanger coil assembly in serviceable condition.
Completed prepaid membership cooling maintenance visit on outdoor condensing unit, model TCGDQ96411SA. Performed comprehensive system inspection, verified electrical specifications at 208-230V 1PH 60HZ, and conducted diagnostic testing using calibrated multimeter to measure voltage and amperage readings across capacitor and electrical components. All measurements within manufacturer specifications, unit operating properly with no deficiencies noted.
Conducted on-site inspection of residential HVAC system to provide accurate duct cleaning estimate. Previous estimate incorrectly listed four systems; confirmed property has two systems and assessed ductwork configuration in basement mechanical room. Documented furnace units, supply and return ductwork routing, and accessibility for cleaning procedures, and discussed scope of work with homeowner for both current duct cleaning proposal and previously provided estimate from April.
Completed full HVAC system installation in basement utility area, including new air handler unit with integrated auxiliary heating capabilities. Installed and secured all refrigerant lines, electrical connections, flexible ductwork transitions, and condensate drainage system per manufacturer specifications. System tested and verified operational with all safety labels and data plates properly affixed.
Performed comprehensive tune-up on outdoor heat pump condenser unit. Upon arrival, found heat exchanger coils heavily contaminated with dirt, debris, and biological growth causing significant airflow restriction. Removed access panels to expose internal components, revealing substantial accumulation of dust and debris on interior surfaces and coil fins. Thoroughly cleaned condenser coils using appropriate cleaning methods to restore proper heat transfer efficiency. Cleared all debris from unit interior and surrounding area. Inspected copper refrigerant lines and insulation for damage. Verified proper operation of all mechanical and electrical components following cleaning procedures. Unit returned to normal operating condition with improved airflow and heat exchange capacity.
