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) 299-6197 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 Whether your current system is outdated or struggling, we’re here to help.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) 299-6197 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
Job Locations and Reviews
Completed estimate for full HVAC system replacement including natural gas furnace located in basement utility closet and outdoor air conditioning unit. Existing furnace showed signs of wear after limping through winter season. Assessed current installation configuration with furnace positioned in basement closet space with cylindrical ductwork elbow and outdoor condensing unit mounted on elevated white platform against house exterior with proper electrical disconnect and PVC condensate drainage. Provided pricing for complete system replacement with promotional upgrade package for air conditioning unit when purchased together with new furnace system.
Responded to service call for water softener continuously running and requiring manual shutdown. Performed diagnostic inspection of water treatment system in basement mechanical room. Identified malfunction in regeneration cycle control causing unit to run without stopping. Inspected control valve assembly, timer mechanism, and associated plumbing connections. Evaluated copper piping configuration, bypass valves, and electrical components mounted on system. Assessed overall condition of water softener tank, resin bed functionality, and brine tank operation to determine root cause of continuous operation issue.
Completed preventive maintenance tune-up on dual-head Mitsubishi ductless mini-split system. Inspected and serviced both indoor wall-mounted air handlers and outdoor condensing unit, checked refrigerant levels, cleaned filters, and verified proper system operation. Assessed blower wheels for cleaning requirements and documented equipment condition with photographs for customer review.
Responded to no cooling complaint and performed diagnostic evaluation of residential air conditioning system. Upon arrival, inspected outdoor condenser unit, verified equipment specifications from unit nameplate, and documented system condition with photos. Unit appeared to be in operational condition with no visible external damage or obvious mechanical failures noted during initial assessment.
Completed on-site estimate for installation of a two-head ductless mini-split system in a tri-level condominium. Customer currently relies on two wall-mounted window AC units that provide insufficient cooling capacity for the space. Assessed installation requirements for both indoor air handler locations in the living areas and evaluated exterior placement options for the outdoor condensing unit. Provided estimate for complete system installation including refrigerant line sets, electrical connections, and wall penetrations required for proper operation.
Conducted on-site estimate for replacement of existing air conditioning and natural gas furnace system. Evaluated current outdoor condensing unit and indoor furnace equipment located in basement, documented existing installation conditions including electrical disconnect, refrigerant line set routing, and equipment placement. Provided customer with replacement options and specifications for new HVAC system installation.
Conducted on-site assessment for mini split installation at residential property. Evaluated exterior wall locations and documented proposed installation areas including patio access points and exterior mounting surfaces on vinyl-sided structure for outdoor condenser unit placement and indoor air handler positioning.
Responded to no-cooling complaint where system was running continuously but unable to maintain setpoint, with indoor temperature rising to 76°F despite thermostat set at 72°F. Performed diagnostic evaluation of outdoor condensing unit using digital multimeter and refrigerant testing equipment to measure electrical values and assess system performance. Connected diagnostic gauges to service ports to check refrigerant pressures and determine root cause of inadequate cooling capacity.
Completed routine cooling season maintenance visit on Magic-Pak combined forced air furnace and cooling unit, model HWC8N3609P18A2A. Performed comprehensive system inspection including electrical testing with multimeter to verify proper voltage and amperage across all components, inspected evaporator coil condition, checked refrigerant lines and drainage components, and documented equipment specifications confirming R-410A refrigerant charge and proper operating pressures.
Completed furnace and air conditioning tune-up on Lennox heating system and air handler unit located in basement mechanical room. Performed standard seasonal maintenance inspection, checked all operational components, and verified proper system function. Customer declined additional air handler cleaning and checking services at this time.
Completed estimate for replacement of existing natural gas furnace and installation of new air conditioning system in basement location. Documented current system configuration including thermostat setup and electrical panel specifications to determine equipment requirements and installation parameters for proposed HVAC system upgrade.
Conducted on-site evaluation of existing water softening system in basement mechanical room for replacement estimate. Assessed current water softener unit with beige control box, copper piping connections, and red-handled shut-off valves, noting configuration alongside existing water heater, HVAC equipment, and associated plumbing infrastructure. Documented equipment layout, pipe routing, and installation requirements to provide comprehensive replacement proposal for new water treatment system.
Completed routine cooling system maintenance visit on residential air conditioning unit. Upon arrival, found condenser coils heavily contaminated with pollen, dirt, and organic debris causing significant airflow restriction. Removed front access panel to assess internal components and documented extensive buildup on fin surfaces with visible discoloration throughout coil array. Performed thorough coil cleaning to restore proper heat exchange efficiency and airflow capacity. Inspected compressor assembly, fan operation, and overall unit condition. System returned to optimal operating parameters following maintenance procedures.
Completed routine cooling system maintenance and tune-up on residential Lennox air conditioning unit. Performed system diagnostics using manifold gauge set to verify refrigerant pressures and overall system performance, confirmed proper operation of condenser unit, and documented equipment condition with all components functioning within manufacturer specifications.
Conducted site assessment and provided estimate for replacement of interior water shut-off valve and exterior hose spigot. Inspected existing copper supply line running through ceiling cavity and evaluated current valve condition, noting blue-handled shut-off requiring replacement. Documented mechanical chase area showing copper plumbing infrastructure, HVAC ductwork, and structural framing to determine scope of work and access requirements for proposed fixture replacements.
Completed full HVAC system installation including new air conditioning condenser unit and furnace. Installed outdoor condensing unit on concrete pad with proper clearances from structure, mounted Eaton electrical disconnect box to exterior wall, and ran gray PVC conduit for electrical connections. Routed refrigerant line sets with insulation between outdoor and indoor units. System was pressure tested, evacuated, and charged to manufacturer specifications. All electrical connections completed per code requirements, unit tested and confirmed operational with proper airflow and cycling.
Completed comprehensive furnace and air conditioning tune-up with emphasis on gas safety inspection. Performed combustion analysis using Testo 310 II analyzer, which confirmed safe operating parameters with CO readings at 7.5 ppm and oxygen levels at 88.9%. Thoroughly inspected all accessible HVAC components, ductwork, and gas connections with no gas leaks detected throughout the system.
Performed annual tune-up on HVAC system, including pressure and temperature diagnostics using manifold gauge set to verify refrigerant charge and system performance. Observed heavy condensation on suction line with deteriorated insulation at connection point, indicating potential insulation replacement needed to prevent efficiency loss and moisture damage.
Completed preventive maintenance cooling visit on residential air conditioning system as part of prepaid membership agreement. Performed standard system inspection and diagnostics using manifold gauge set to check refrigerant pressures and verify proper operation of condenser unit. All components inspected and system operating within normal parameters.
Conducted comprehensive estimate for complete HVAC system replacement including aging furnace and air conditioning unit located in basement mechanical room. Both units currently operational but have exceeded recommended service life and require replacement to ensure continued reliability and efficiency. Documented existing equipment configuration including outdoor condensing unit, refrigerant lines, ductwork connections, and basement furnace installation with supporting photography for proposal development.