Your home is your sanctuary, and at Thielmann Heating, Cooling & Plumbing, we’re here to help keep it that way. Since 1929, we’ve been the trusted name in the Grand Rapids area for heating, cooling, and plumbing services that go beyond quick fixes—we focus on long-term comfort, reliability, and efficiency. Our team takes a hands-on approach, ensuring that every repair, installation, and maintenance job is done with precision and care. We know what it takes to keep a home running smoothly, and we’re committed to delivering Slinger home services that give you confidence in your home’s essential systems, no matter the season. When you need the best, call the Thielmann team at (262) 315-3067 or contact us online for more information.
Dependable Slinger Heating Services
Having a dependable heating system means more than just staying warm—it’s about keeping your home safe and comfortable through the toughest months of the year. Whether your current system is outdated or struggling, we’re here to help. The team of Slinger HVAC technicians at Thielmann takes the time to understand your space, energy needs, and comfort preferences to recommend the best heating solution for your home, so you can enjoy consistent, reliable warmth all season long. Our heating services in Slinger include:
Boiler Maintenance & Repair
Boilers offer steady, even heating, but they need regular care to keep running efficiently. Our Slinger HVAC technicians provide comprehensive maintenance, checking for leaks, flushing the system, and ensuring proper pressure so your boiler continues to deliver dependable warmth. If it’s time for a replacement, we’ll guide you through the best options available.
Furnace Installation & Replacement
Is your old furnace struggling to keep up? A new, energy-efficient system can make a world of difference in both warmth and energy costs. We help homeowners choose the right furnace for their home, ensuring it’s the perfect size and properly installed for maximum efficiency. No more cold spots, no more sky-high heating bills—just reliable warmth when you need it most.
Preventative Heating Maintenance in Slinger
Regular tune-ups help keep your system running smoothly and efficiently, reducing the risk of breakdowns when you need heat the most. Our heating maintenance services ensure your heating system in Slinger stays in peak condition, saving you money on repairs and energy bills in the long run.
Fast, Reliable Heating Repairs
A broken heating system in the middle of winter is more than an inconvenience—it’s an emergency. We respond quickly to diagnose the issue and get your heat back on as soon as possible. From minor fixes to major repairs, we have the expertise to restore warmth to your home without unnecessary delays.
Slinger Cooling Services That Beat the Heat
If your Slinger air conditioning system is working overtime and still not keeping up, it might be time for an upgrade or a professional maintenance call. Our team of local HVAC technicians focuses on more than just quick fixes—we assess airflow, insulation, and system efficiency to make sure your cooling setup is working at its best. Our cooling services in Slinger include:
- AC Installation & Replacement: If your current system isn’t keeping up, we’ll help you choose and install an energy-efficient AC unit that delivers powerful cooling without breaking the bank.
- Ductless Mini-Split Systems: Perfect for homes without central air, mini-splits offer precise temperature control while saving energy.
- AC Repairs: Strange noises? Weak airflow? Warm air instead of cold? We quickly diagnose and fix any issue, so your system runs like new again.
- AC Maintenance Plans: Prevent breakdowns and extend the life of your AC with seasonal tune-ups that improve performance and reduce energy costs.
Comprehensive Plumbing Services in Slinger
A plumbing issue can throw your whole day off track, whether it’s an annoying drip, a water heater that suddenly quits, or a pipe that bursts without warning. Instead of stressing over leaks and repairs, let us handle it. With Slinger plumbing services from Thielmann, you get a team that will tackle every job with precision, whether it’s a simple fix or a major installation, so you can get back to your routine without the headache.
- Leak Detection & Pipe Repairs: We locate and repair leaks before they lead to major water damage, ensuring your pipes remain durable and efficient.
- Garbage Disposal Installation & Repair: Whether installing a new unit or repairing a jammed disposal, we help keep your kitchen running smoothly.
- Toilet Repairs & Replacements: From fixing persistent leaks to installing modern, water-efficient toilets, we provide expert solutions for your bathroom.
- Plumbing System Inspections: Regular inspections can catch small issues before they become major problems, helping you avoid costly repairs and water damage.
- Water Heater Installation & Service: We install, repair, and maintain both traditional and tankless water heaters, ensuring you always have hot water when you need it.
- Fixture Installations & Upgrades: Upgrade your kitchen and bathroom with high-efficiency sinks, faucets, and toilets that enhance both function and style.
- Sump Pump Installation & Maintenance: Keep your basement dry with professional sump pump installation and maintenance to prevent flooding and water damage.
- Water Softener Systems: Improve your water quality by reducing hard water buildup, protecting appliances, and making daily cleaning easier.
Why Homeowners Trust Thielmann Heating, Cooling & Plumbing
For nearly a century, we’ve built a reputation for excellence, and we’re proud to be the go-to home service provider in Slinger. Here’s why homeowners continue to choose us:
- Generations of Expertise: With over 90 years in business, we’ve seen it all and know what works best for homes in the area.
- Top-Quality Products & Workmanship: We only use the best materials and equipment, ensuring every repair and installation is built to last.
- Personalized Service: Every home is unique, and we take the time to find solutions that fit your specific needs and budget.
- Honest, Upfront Pricing: No surprises, no gimmicks—just straightforward pricing and clear explanations of the work we do.
- Fast & Friendly Service: We respect your time and work efficiently to restore comfort to your home as quickly as possible.
Schedule Your Service in Slinger Today
At Thielmann Heating, Cooling & Plumbing, we know that a comfortable home isn’t just about functioning comfort systems—it’s about peace of mind. Whether your heating needs a tune-up, your AC could use an upgrade, or your plumbing is acting up, we’re here to provide expert service you can trust. Reach out today by calling (262) 315-3067 to schedule an appointment and let us handle the hard work while you enjoy the comfort of a well-maintained home.
Recent Jobs and Reviews in Slinger, WI
Slinger, WI at a glance
Thielmann Heating, Cooling & Plumbing has completed 20 jobs in Slinger, WI between October 2026 and November 2026.
The most recent job was on November 13, 2026.
Thielmann Heating, Cooling & Plumbing has completed 226 jobs in Slinger, WI in the last 12 months.
Job Locations and Reviews
Responded to a no-heat call on a 10+ year old LP furnace, inspected the condensate/PVC drain piping and fittings (no cracks, leaks, or blockage observed), and verified combustion operation with a Testo 310 II flue gas analyzer. Final readings showed stack temperature of 90.6°F, O2 at 10.5%, CO at 7 ppm (14 ppm air-free), CO2 at 5.89%, and combustion efficiency of 95.2%, confirming safe, proper furnace operation and restored heating.
Performed a full seasonal tune-up on the gas furnace and associated cooling system, inspecting the gas valve assembly, burner components, inducer blower and motor, and wiring harnesses for proper operation. Verified condensate drain piping, ductwork, and insulated refrigerant lines were intact with no signs of leaks, frost, or damage, and used a digital meter to test system electrical and performance readings. Noted light surface rust on small hardware around the gas valve and recommend monitoring it at future visits.
Performed a scheduled maintenance inspection under the service agreement, including a borescope inspection of the air handler interior that documented the coil and plenum sections, with light staining visible on one surface. Inspected the furnace control board and found yellowed discoloration indicating possible heat exposure or contamination; verified the 5-amp fuse, wiring harness connections, and board condition for proper operation.
Performed an on-site estimate for replacement of a leaking A.O. Smith electric water heater installed in a closet alcove, assessing the tank, supply and outlet piping, shutoff valve, flexible conduit and electrical junction connections, and drain provisions, and taking measurements to determine the replacement unit and installation requirements. Reviewed financing options with the customer to support the replacement.
Returned on a recall visit to correct previously installed incorrect parts on the tanked water heater and inspected the threaded inlet/outlet fittings. Found heavy mineral scale buildup, corrosion, and sediment deposits inside the fitting bores and threads, and addressed the affected connections to restore proper fit and flow.
Performed an on-site estimate for the installation of a new garage heater, evaluating the existing utility space for routing and clearance. Inspected the exposed joist framing and OSB subfloor, noting the existing black iron gas piping, CPVC water supply lines, PVC drain piping, and electrical service, all in good condition with no visible rust, leaks, or damage. Documented the area with photos to support equipment sizing, gas, venting, and electrical requirements for the replacement installation.
Performed a furnace tune-up, inspecting the gas valve, burner assembly, pressure switches, inducer motor, and control wiring. Verified manifold gas pressure with a digital dual port manometer (reading 1.73 inWC) and tested pressure switch operation. Noted surface rust and corrosion on the black iron gas supply pipe, along with dust and debris at the cabinet base, which should be monitored for future service.
Performed a seasonal tune-up on a Lennox-controlled furnace system, inspecting the supply plenum, ductwork, foil-taped seams, refrigerant line set, and PVC condensate/vent piping, with all components found clean and in normal condition with no signs of frost, rust, or damage. Verified thermostat operation in heat mode with the fan and humidifier functioning properly, confirming the system is heating to setpoint.
Responded to a no-heat call on a Modine unit heater and inspected the suspended heating equipment. Inspection revealed a cracked, ribbed metal component, indicating a fractured heat exchanger and a failed heating section. Documented the failure with photos, and also recorded equipment information for the Reznor unit heater installed on the elevated platform at the new site.
Performed a furnace tune-up including combustion analysis on the natural gas high-efficiency unit. Readings were within normal operating parameters: 102.9°F stack temperature, 5.7% O2, 8.6% CO2, 43 PPM CO (59 PPM air-free), 0.220 inWC draft, 37.4% excess air, and 95.4% combustion efficiency. The system is operating safely and efficiently.
Responded to a new installation start-up call for a system that would not power on and inspected the outdoor unit's low-voltage and line-voltage terminal connections at the control compartment. Verified wiring terminations at the S1/S2/S3 and L1 terminals and confirmed the ground connections were secure and the wiring was within the unit's UL 300V rating. Confirmed service valves and refrigerant line connections were intact and completed system start-up.
Performed a heating tune-up and safety inspection on a 9-year-old gas furnace, inspecting the inducer assembly, pressure switch, gas valve, burner and heat exchanger compartment, and control board wiring, with static and manometer pressure readings taken. Documented heavy surface corrosion on the gas supply pipe and cabinet floor beneath the blower assembly, with rust streaking from the inducer housing fitting indicating possible moisture or condensate leakage. Recommend further evaluation of the condensate and drain components and monitoring of the corroded areas.
Performed a scheduled heating maintenance visit under the prepaid membership, inspecting the furnace system and associated components for proper operation. Visually inspected the PVC condensate and vent piping, flexible hose, and insulated ductwork in the basement utility space; all were properly supported by clamps and hangers with no signs of leaks, corrosion, cracking, or damage observed.
Performed a recurring seasonal heating maintenance inspection on the gas furnace, removing the front access panel to evaluate the control board, igniter assembly, relays, gas valve, and associated wiring. Used a digital multimeter to verify electrical operation of key components, and inspected the PVC condensate/vent piping, conduit, and junction box connections for proper routing and integrity. System was left operational with the access panel secured.
Installed a new 40-gallon Bradford White power-vent gas water heater, including the PVC exhaust venting, copper water connections, and a new thermal expansion tank mounted on the supply line. Verified all connections are secure with no leaks, and confirmed proper venting and operation of the unit.
Performed a complete tune-up on a 30-year-old mid-efficiency gas boiler, including inspection of the burner assembly, gas valve, and wiring, along with the circulator pump, automatic air vent, expansion tank, and associated piping. Documented heavy corrosion and rust on the piping and fittings, peeling paint on the boiler cabinet, and mineral deposit buildup in the expansion tank drip pan, which indicates a possible slow leak or moisture source that should be monitored. Equipment remains in service given its age and condition, and further evaluation of the corroded components is recommended.
Replaced the existing gas furnace and installed a new split-system air conditioner, including the outdoor condenser, refrigerant line set, and condensate drain piping. Performed line set evacuation and charging with a digital manifold gauge set and vacuum pump, completed electrical connections with a licensed electrician, and obtained all required permits.
Performed a furnace tune-up, inspecting the inducer blower assembly, wiring harness connections, gas valve, gas piping, and pressure switches, with all components found secure and free of visible rust, cracks, or frost. Verified electrical operation using a digital clamp meter and checked condensate and vent PVC piping and the surrounding air handler for proper condition. Unit operating normally at completion.
Performed a tune-up on the HVAC system, including a static pressure check with a digital manometer, which measured 1.69 inWC. Inspected the condensate drain piping, refrigerant line set, and plenum connections, and found no visible leaks, rust, ice, or damage. Verified system documentation and warranty paperwork were on file at the equipment.
Installed a Bradford White gas-fired storage water heater with new copper supply piping, brass shutoff valves, and a thermal expansion tank, and connected the metal flue vent to the existing chimney path. Gas supply and burner assembly were connected and verified, with the unit operating normally and no leaks or visible damage observed.
