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.
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
Job Locations and Reviews
Located and inspected aging plumbing infrastructure in basement with corroded brass valve assembly. Identified multiple connecting pipes (copper with yellow connectors and white PVC) mounted to structural joists showing signs of deterioration. Replaced damaged components to resolve drainage issues and restore proper function.
Responded to no heat call for unit under 10 years old. Upon inspection, found significant rust and debris below the furnace. Investigation revealed severely corroded copper piping in the burner assembly with active blue flames present. Cleaned accumulated rust particles from the area, replaced deteriorated copper gas line assembly, and verified proper burner operation before completing service.
Performed standard tune-up service on HVAC system. Identified minor mold formation at corner junction of ductwork and measured supply air temperature at 25.8°F, which falls within normal operational parameters. Cleaned affected area and verified proper system function.
Performed routine HVAC tune-up service on existing furnace system. Inspected heat exchanger components and observed soot buildup in duct connections. Removed front panel to examine PVC exhaust pipe, draft inducer motor, control board, and wiring connections. All components were found in normal working condition with no signs of deterioration or leakage.
Conducted comprehensive inspection of existing HVAC system in unfinished basement area. Evaluated aging furnace unit showing signs of wear on internal components and wiring. Documented current installation conditions including ventilation configuration and potential replacement requirements for the complete system.
Conducted assessment of aging water heater installation in basement utility area showing signs of galvanic corrosion at copper/galvanized pipe connections. Noted significant water damage on concrete floor and walls, with visible staining and moisture issues. Recommended replacement of current system with modern unit to address corrosion issues and prevent potential water damage progression.
Responded to no heat call for Ruud furnace in utility room. Upon inspection, found pressure switch fault preventing ignition sequence. Cleaned condensate drain line that was partially blocked, reset system, and verified proper operation through complete heating cycle. Unit now functioning normally with good flame pattern and appropriate temperature rise.
Conducted evaluation of electrical infrastructure to prepare for HVAC system replacement. Inspected existing electrical panel for compatibility and proper circuit configurations. Documented current equipment specifications from manufacturer labels to determine appropriate replacement unit parameters. Verified electrical capacity requirements for new installation will be met by existing panel.
Performed scheduled tune-up service on unit and discovered significant corrosion and oxidation on evaporator coils. Inspection revealed extensive rust formation on copper tubing, particularly at the bends, indicating advanced deterioration of the heat exchange components. Recommend scheduling full system evaluation as the current condition may affect system efficiency and longevity.
Conducted comprehensive inspection of residential water treatment system. System consists of primary cylindrical filtration tank with control head, connected to house plumbing via copper pipe network with multiple control valves. Identified aging copper pipes showing significant patina and potential corrosion points at critical junctions that may require future attention.
Responded to no heat call for Pride gas furnace less than 10 years old. Opened access panel to inspect internal components including wiring and control boards. Performed diagnostic testing using specialized tools, identified and repaired faulty connection in control circuit that was preventing ignition sequence. System now operating within normal parameters with proper heat output.
Performed comprehensive tune-up service on Lennox HVAC system. Inspected ignition control module, verified proper wire connections, and checked gas valve functionality. System components were found in normal working condition with no issues detected.
Performed inspection of furnace system revealing corrosion on drain pan and condensate components. Documented evidence of rust formation on metal housing near drainage assembly. Examined control board, electrical connections, and heat exchanger – all operational with no visible damage. Captured detailed photos of interior components for warranty documentation.
Diagnosed and serviced 10+ year old Honeywell furnace that was not producing heat. Upon inspection, identified issues with the gas valve assembly and ignition sequence. Cleaned flame sensor, reset control board, and verified proper gas flow through manifold. After repairs, tested system operation with all burners showing proper blue flame pattern and confirmed normal heat cycle completion. Unit now operating at expected efficiency.
Performed routine maintenance on HVAC system, including inspection of ductwork which showed signs of sediment buildup requiring future attention. Temperature readings taken with UEi thermometer confirmed system operating at 121.2°F, within acceptable parameters for this unit type.
Conducted routine HVAC tune-up service with thermal inspection of ductwork system. Temperature readings showed 181°F at measured point on supply duct, indicating proper operation within normal parameters. Inspected and verified integrity of ductwork connections and adjacent PVC plumbing infrastructure.
Responded to no-heat service call for Rheem Plus 90 furnace (10+ years old). Inspected unit and found failed ignition sequence due to dirty flame sensor. Cleaned flame sensor, tested ignition cycle multiple times to confirm proper operation, and verified adequate heat output throughout the home. System now operating within manufacturer specifications.
Performed furnace maintenance inspection by accessing interior components. Inspected blower motor assembly, electrical connections (including yellow/white wiring), and verified proper operation of drainage and ventilation systems. Observed functional status indicator light and examined Carrier component installation. All systems operating within normal parameters after service.
Conducted HVAC ductwork inspection, identifying and documenting internal conditions with photographic evidence. Visual assessment revealed potential areas of concern in ductwork junctions and surfaces requiring further evaluation.
Installed and commissioned a high-efficiency heat pump water heater with digital controls in basement utility area. Connected unit to existing plumbing system including installation of expansion tank, PVC piping, and proper valving. Completed all electrical connections and verified system operation before leaving site.
