2026 We’re excited to announce that Johnstone Supply of Southeast Wisconsin is now partnering with Eventbrite to streamline registration and payment for our upcoming training classes!

This new system will make it easier than ever for contractors to sign up, pay securely online, and manage their training schedule all in one place.

Once you’re registered, you’ll be able to browse available classes, reserve your spot instantly, and process payments directly through the platform.

We’ve also implemented a 3-day cancellation window, so if something comes up and you can’t make the class, you’ll have time to cancel and receive a refund.

We're confident this upgrade will enhance your training experience, and we look forward to seeing you in class soon! Click one of the blue links below to get started.

February

ECM Motors Replacement/Setup-Brad

Tuesday, February 24th, 8:30- 12 Noon, Menomonee Falls

ECM Motors Replacement/Setup-Brad

Wednesday, February 25th, 8:30- 12 Noon, Oak Creek

March

Navien Level 2 NPF-Navien Factory Trainer

Tuesday, March 3rd, 8:30- 11:30 am, Menomonee Falls

A/C Install and Troubleshooting- Whited and Raman

Tuesday, March 10th, 8 am- 12 Noon, Waukesha

Southwark University-Factory Trainer

Wednesday, March 11th, 8 am- 12 Noon, Menomonee Falls

Hydronics 101-MW2

Tuesday, March 17th, 8 am- 12 Noon, Menomonee Falls

Combustion Analysis Boilers-MW2

Wednesday, March 18th, 10 am-12 Noon, Menomonee Falls

Hydronics 201-MW2

Thursday, March 19th, 8 am- 12 Noon, Menomonee Falls

April

Navien Level 2 NPF-Navien Factory Trainer

Wednesday, April 8th, 8:30- 11:30 am, Fond du lac

A/C Install and Troubleshooting- Whited and Raman

Thursday, April 9th, 8 am- 12 Noon, Oak Creek

JB Pump Days

Tuesday, April 14th, 11 am- 2 pm, Fond du lac

JB Pump Days

Wednesday, April 15th, 11 am- 2 pm, Waukesha

JB Pump Days

Thursday, April 16th, 11 am- 2 pm, Menomonee Falls

JB Pump Days

Friday, April 17th, 11 am- 2 pm, Oak Creek

Test and Tool-Whited

Tuesday, April 21st,10 am- 12 Noon, Menomonee Falls

Low Voltage Wiring and Troubleshooting-Whited

Wednesday, April 22nd, 8:30-12 Noon, Oak Creek

Ductless Install and Troubleshooting- Whited and Raman

Thursday, April 23rd, 8 am- 12 Noon, Menomonee Falls

Ductless Install and Troubleshooting- Whited and Raman

Wednesday, April 29th, 8 am- 12 Noon, Oak Creek

May

A/C Install and Troubleshooting- Whited and Raman

Wednesday, May 13th, 8 am- 12 Noon, Menomonee Falls

June

Brazing Fundamentals

Wednesday, June 17th 8:30-11:30, Menomonee Falls

Class Descriptions

Furnace Install & Troubleshooting – Master the Essentials with Johnstone Supply Training Classes

This hands-on training class is ideal for HVAC professionals ready to strengthen their installation skills or refine their troubleshooting process. Dive into the world of furnaces as we cover proper installation techniques, airflow testing, and key system checks.

Learn how to diagnose common furnace issues quickly and accurately, ensuring safe, efficient operation on every job. We’ll also walk through startup procedures, combustion analysis, and best practices for long-term system performance.

With an open forum presentation, your real-world challenges will help shape the conversation, creating an interactive and practical learning experience.



Don’t miss this opportunity to sharpen your furnace know-how and take your service calls to the next level!

5 Key Training Takeaways:

1. Proper Installation Techniques – Learn step-by-step best practices for installing gas furnaces safely.
2. Startup & System Checkout – Understand startup procedures, key test points, and what to verify before leaving the job.
3. Troubleshooting Like a Pro – Discover fast and effective diagnostic methods for common issues like short cycling, no heat calls, and airflow problems.
4. Combustion Analysis – Use tools to test and tune combustion for safety, performance, and efficiency.
5. Preventative Maintenance Tips – Learn service strategies that reduce callbacks and extend system life.

A/C Service & Troubleshooting – Build Confidence and Speed with Johnstone Supply Training Classes

This hands-on training class is designed for HVAC professionals looking to sharpen their air conditioning service skills and become more efficient troubleshooters in the field. We’ll break down A/C system operation, component functions, and proven diagnostic workflows to help you identify problems quickly and accurately.

From electrical diagnostics to refrigerant circuit analysis, this class focuses on real-world service scenarios you encounter every cooling season. You’ll learn how to interpret symptoms, verify system performance, and avoid common misdiagnoses that lead to repeat callbacks.

The session is delivered in an open forum format, encouraging discussion around real service challenges, field experiences, and best practices—making the training practical, engaging, and immediately applicable.

Don’t miss this opportunity to improve your A/C troubleshooting skills and elevate the quality of every service call.

5 Key Training Takeaways:

1. A/C System Fundamentals – Understand how compressors, condensers, evaporators, metering devices, and controls work together.
2. Electrical & Control Diagnostics – Learn systematic approaches to diagnosing capacitors, contactors, motors, and low/high voltage issues.
3. Refrigerant Circuit Troubleshooting – Identify common problems such as under/overcharging, restrictions, and airflow-related faults.
4. Performance Testing & Verification – Use temperature split, superheat, subcooling, and airflow checks to confirm proper operation.
5. Service Best Practices – Apply proven service and maintenance strategies that improve efficiency, reliability, and customer satisfaction.

This class is ideal for technicians who want to reduce guesswork, increase confidence, and deliver consistent, professional A/C service.

Ductless Install & Troubleshooting – Precision, Performance, and Best Practices with Johnstone Supply Training Classes

This hands-on training class is designed for HVAC professionals who want to confidently install, commission, and troubleshoot ductless and mini-split systems. We’ll cover proper system design considerations, installation best practices, and critical setup steps that ensure long-term reliability and peak performance.

You’ll gain a deeper understanding of ductless system components, controls, and communication, along with proven diagnostic methods for resolving common installation and service issues. From startup verification to advanced troubleshooting, this class focuses on real-world scenarios technicians face in the field.

The session is delivered in an open forum format, encouraging discussion around jobsite challenges, manufacturer nuances, and field-proven solutions—making the training practical, interactive, and immediately applicable.

Don’t miss this opportunity to elevate your ductless expertise and deliver cleaner installs, faster diagnostics, and happier customers.

5 Key Training Takeaways:

1. Proper Ductless Installation Techniques – Learn best practices for mounting, piping, wiring, and condensate management.
2. Startup & Commissioning Procedures – Verify correct operation, settings, and performance before leaving the job.
3. Refrigerant Piping & Charging – Understand piping requirements, evacuation, charging methods, and common mistakes to avoid.
4. Controls & Communication Troubleshooting – Diagnose sensor issues, communication errors, and control-related faults.
5. Service & Maintenance Best Practices – Reduce callbacks and extend system life with proven maintenance and diagnostic strategies.



This class is ideal for technicians looking to master ductless systems and confidently handle both installs and service calls.

Southwark University In-Person Training – Practical Field Knowledge Led by Eric Kravitz

Southwark University is launching a new in-person training program designed to deliver focused, real-world HVAC education directly to your team. Led by our new hands-on trainer, Eric Kravitz, this program emphasizes practical application, field-proven techniques, and interactive learning built around today’s jobsite challenges.

The 4-hour on-location course is designed to fit into a normal workday while providing meaningful technical depth. Training is conducted in person, allowing for live demonstrations, open discussion, and direct engagement with Eric to address real scenarios your technicians encounter in the field.

This program is ideal for teams looking to sharpen skills, improve troubleshooting efficiency, and align best practices across their organization.

5 Key Training Takeaways:

1. Instructor-Led, In-Person Training – Learn directly from Eric Kravitz with hands-on instruction and real-world insight.
2. Field-Focused Curriculum – Content built around common service, install, and troubleshooting challenges technicians face daily.
3. Interactive Learning Environment – Open forum discussion encourages questions, shared experiences, and practical problem-solving.
4. Efficient 4-Hour Format – High-value training designed to maximize impact without pulling teams out of the field all day.
5. On-Location Convenience – Training delivered at your site for maximum participation and relevance.



Southwark University is built to elevate technician performance through education that’s practical, engaging, and immediately applicable. With scheduling opening soon and demand already high, early training requests are encouraged.

A2L Refrigerant Safety & Transition Training – Stay Ahead with Johnstone Supply Training Classes

This essential training class is designed for HVAC professionals navigating the industry shift to A2L refrigerants. Whether you're a seasoned tech or a business owner preparing your team, this session delivers the knowledge and confidence needed to safely work with A2Ls in residential and light commercial applications.

We’ll cover the properties of A2L refrigerants, changes in equipment and tools, proper handling techniques, and updated safety protocols. Regulatory requirements and manufacturer recommendations will also be discussed.

Presented in an open forum format, the class encourages interactive discussion and real-world scenario exploration so you can leave ready to tackle A2L transitions with certainty.



Don’t get left behind—get trained and stay compliant!

🔑 5 Key Training Takeaways:

1. Understanding A2L Refrigerants – Learn the properties of mildly flammable A2Ls and how they compare to legacy refrigerants.
2. Safe Handling Procedures – Gain hands-on knowledge of charging, recovery, leak detection, and ventilation requirements.
3. Code & Compliance Updates – Review new codes, labeling requirements, and EPA/regulatory guidelines tied to A2L use.
4. Tool & Equipment Changes – Identify what tools need to be upgraded or adjusted for compatibility with A2L systems.
5. Jobsite Best Practices – Learn how to plan, communicate, and operate safely on-site with customers and co-workers.

ECM Motors Replacement/Setup

Join ECM motor expert Jamie Norris from Regal Beloit for a hands-on training session designed to improve your confidence and capability in ECM motor replacement and setup.

This session will focus on real-world applications, troubleshooting techniques, and best practices to ensure proper installation and commissioning.

Whether you’re dealing with OEM replacements or upgrading existing systems, this class will deliver essential insights to keep your jobs running smoothly and efficiently.

What You’ll Learn:

• Identifying different types of ECM motors and understanding their applications
• Step-by-step motor replacement procedures
• Proper setup and programming techniques
• Diagnosing common ECM motor failures and issues
• Tips for maximizing motor performance and longevity

🔥5 Key Training Takeaways:

1. Motor Identification & Compatibility – Learn to identify various ECM motors and match them correctly to systems for optimal performance.
2. Hands-On Setup Techniques – Gain practical experience in programming and calibrating ECM motors using manufacturer tools and protocols.
3. Troubleshooting Skills – Discover proven methods to diagnose and resolve common ECM motor issues in the field.
4. Efficiency & Performance Tips – Understand how correct setup impacts system efficiency and customer satisfaction.
5. Expert Q&A Opportunity – Get direct access to one of the industry's leading ECM expert to ask questions and discuss field scenarios.

Hydronics 101 – Build Your Foundation in Modern Hydronic Systems

Presented by Johnstone Supply of SE Wisconsin

Whether you're new to hydronics or looking to sharpen your knowledge, this class is the perfect opportunity to strengthen your HVAC skillset. In this practical, discussion-driven course, we’ll explore:

• The different types of hydronic systems
• Key system components
• Smart system design strategies
• Piping best practices for performance and longevity

You'll also learn how to properly size pipes, pumps, and boilers, and how to select the right boiler for a range of real-world applications. This open-forum format encourages questions and interaction, making each session tailored to the group’s needs and challenges.

Join us and gain the confidence to design, install, and service hydronic systems with greater accuracy and efficiency.



Combustion Analysis for Boilers – Maximize Performance with Johnstone Supply Training Classes

This focused training class is perfect for HVAC professionals who want to improve their combustion analysis skills and deliver safer, more efficient boiler service. Whether you're working on residential or light commercial systems, understanding combustion data is key to getting the most out of every install or service call.

We’ll cover the fundamentals of combustion, why analysis matters, and how to use combustion testing instruments correctly. You’ll learn how to interpret readings, make necessary adjustments, and ensure boilers are operating at peak performance—all while maintaining safety and compliance.

Presented in an open forum format, this class invites questions and real-world examples to make the content as relevant and practical as possible.

Take the guesswork out of boiler tuning—master combustion analysis and elevate your service!

🔥 5 Key Training Takeaways:

1. Combustion Basics – Understand the science behind combustion and what factors influence efficiency and safety.
2. Using Analyzers Properly – Learn how to set up, calibrate, and use combustion analyzers for accurate readings.
3. Interpreting Data – Decode O₂, CO₂, CO, draft, and stack temperature readings to diagnose and fine-tune boiler performance.
4. Efficiency Optimization – Discover how proper analysis leads to fuel savings, cleaner burns, and fewer callbacks.
5. Jobsite Safety – Ensure all combustion testing is done safely.

Hydronics 201 – Advanced Applications & Troubleshooting

Take your hydronics knowledge to the next level with this advanced training session built for experienced HVAC professionals. Hydronics 201 dives deeper into real-world system design, complex piping strategies, and troubleshooting high-efficiency boiler systems.

We’ll explore multi-zone layouts, mixing strategies, pump curve applications, control wiring, and diagnosing performance issues in both radiant and baseboard systems. With a focus on design logic and field-proven techniques, this class is perfect for techs ready to fine-tune their craft.

Presented in an open forum style, this session allows attendees to bring field challenges and questions, making the learning experience interactive and practical.

Build smarter systems, solve tougher problems, and become the hydronics expert your customers rely on.

💧 5 Key Training Takeaways:

1. Advanced System Design – Learn how to design and balance multi-zone systems, mixing loops, and hybrid hydronic layouts.
2. Pump Selection & Curve Matching – Understand pump sizing using performance curves and how to correct common mistakes.
3. Controls & Wiring – Explore advanced wiring and control strategies for zoning, thermostats, and outdoor reset.
4. Troubleshooting Techniques – Identify and solve flow-related issues, short cycling, air problems, and inefficiencies.
5. Real-World Case Studies – Review real installation and service scenarios to sharpen your problem-solving skills.

Resideo Combustion Training – Unlock Precision & Safety with Johnstone Supply Training Classes

Presented by Isaac Rovner – Resideo Technical Expert

Join Resideo’s own Isaac Rovner for an in-depth training session focused on combustion analysis, safety controls, and system optimization. This class is perfect for HVAC techs and installers looking to fine-tune their combustion skills while gaining a deeper understanding of how Resideo products play a critical role in system safety and efficiency.

You'll explore the full combustion process, best practices for using testing tools, and how to properly install and troubleshoot Resideo combustion safety components. From gas valves and ignition controls to venting and flame sensing—this training covers it all.

Interactive and hands-on, this class gives you the tools to troubleshoot with confidence and deliver better results on every job.

🔥 5 Key Training Takeaways:

1. Combustion Fundamentals – Understand the complete combustion cycle and how it affects system performance and safety.
2. Resideo Product Integration – Learn how Resideo controls, sensors, and safety devices function within today’s heating systems.
3. Flame Sensing & Ignition Control – Get expert instruction on verifying ignition, measuring flame signal, and resolving issues fast.
4. Hands-On Analyzer Use – Practice using combustion analyzers and interpreting results to tune for optimal efficiency.
5. Troubleshooting & Best Practices – Sharpen your diagnostic skills with real-world examples and pro tips from the field.

Evcon & Coleman Product Training – Maximize System Knowledge with Johnstone Supply Training Classes

Presented by Brent Boehm – Johnson Controls (JCI)

Join Brent Boehm from Johnson Controls for a comprehensive look at the latest Evcon and Coleman equipment offerings. Whether you’re installing, servicing, or selling these systems, this class will provide valuable insight into features, benefits, and best practices to help you stand out in the field.

We’ll cover product specs, application tips, installation guidelines, and common troubleshooting procedures. Learn how to position these trusted brands with confidence and deliver added value to your customers.

If you're working with or considering Evcon and Coleman, this is a must-attend session for deeper product knowledge and hands-on insight.

🧰 5 Key Training Takeaways:

1. Product Overview & Differentiators – Understand the key features, benefits, and innovations behind the Evcon and Coleman residential lines.
2. Installation Best Practices – Review proper setup, airflow requirements, and service access considerations to avoid callbacks.
3. Troubleshooting Tips – Learn how to identify and resolve common service issues with confidence and efficiency.
4. Application Guidance – Discover how to match the right system to the right application for optimal performance and customer satisfaction.
5. Warranty & Support Tools – Gain access to resources and support available through JCI to streamline installs and service calls.

Navien Level 2 Training – Advanced Service & Troubleshooting with Johnstone Supply

Presented by Karl Sisson – Navien Expert Trainer

Take your Navien knowledge to the next level with this in-depth Level 2 training session led by Navien technical expert Karl Sisson. Designed for experienced technicians who have already completed a basic Navien course or have field experience, this class dives deep into advanced diagnostics, internal components, and service strategies.

Explore best practices for installation refinement, system performance tuning, and troubleshooting common and complex issues across Navien tankless water heaters, combi-boilers, and boilers.

This training is perfect for service techs, installers, and company owners who want to maximize the performance and reliability of Navien systems.

🔧 5 Key Training Takeaways:

1. Advanced Diagnostics – Master the use of built-in diagnostic tools, service modes, and error code interpretation.
2. Component-Level Troubleshooting – Dive into fan assemblies, gas valves, heat exchangers, sensors, and flow control components.
3. Performance Optimization – Learn how to fine-tune systems for real-world operating conditions and increase customer satisfaction.
4. Installation Corrections & Upgrades – Identify common mistakes in installs and how to correct them for long-term system health.
5. Tech Tips & Resources – Get insider tricks, documentation guidance, and access to Navien’s full suite of support tools.

Navien Level 3 Training – Advance Your Skills & Become an NSS-Certified Pro

Presented by Andrew Minidis – Navien Factory Trainer

Take your Navien expertise to the highest level with this full-day Level 3 training, designed for experienced contractors ready to expand their knowledge of Navien water heaters, boilers, combi-boilers, and the new NPF Hydro Furnace.

Led by factory trainer Andrew Minidis, this course covers advanced installation, service, water quality, and system optimization techniques. It's also a required course for those seeking Navien Service Specialist (NSS) status or looking to be listed on Navien’s contractor locator website.

All attendees will also gain access to a limited-time offer to purchase a steeply discounted Navien parts kit $285, available only during the class through Mondale & Associates. (Must attend full class day to qualify.)

Prerequisite: Navien Level 2 training class completion, Level 3 is your next step toward becoming a Navien-certified expert.

Also receive 6 Wisconsin Plumbing CEU units

🔧 5 Key Training Takeaways:

1. Full-System Training – Dive into Navien water heaters, boilers, combi-boilers, and the new NPF Hydro Furnace.
2. Advanced Installation & Service – Learn factory-recommended practices to improve reliability, performance, and efficiency.
3. Water Quality Essentials – Understand how water quality affects system longevity and warranty compliance.
4. NSS Eligibility – This course fulfills the training requirement to apply as a Navien Service Specialist (NSS).
5. Exclusive Parts Kit Offer – Receive access to a steeply discounted Navien parts kit (must be ordered through Mondale & Associates at class).

Hydro Flo – NTI Boilers & Water Quality Training

Presented by Howie Heier – Hydronic Specialist

Join hydronics expert Howie Heier for a deep dive into NTI boiler systems and the critical role that water quality plays in hydronic performance and system longevity. This training is ideal for technicians, installers, and designers who want to better understand the direct relationship between water chemistry, boiler health, and system efficiency.

We’ll explore NTI product features, piping and venting considerations, and then shift focus to water quality standards, testing methods, treatment options, and the long-term consequences of neglecting system water.

If you work with high-efficiency boilers, this class will sharpen your knowledge and help prevent costly system failures.

💧 5 Key Training Takeaways:

1. NTI Boiler Overview – Understand the latest NTI models, features, control functions, and common install tips.
2. System Design Essentials – Learn best practices for piping layout, venting, and circulation specific to NTI applications.
3. Water Quality Standards – Discover what makes water “good” or “bad” for boilers—and why it matters more than ever.
4. Testing & Treatment Options – Get familiar with testing tools, water treatment products, and when each is appropriate.
5. Preventive Maintenance Strategies – Learn how proper water quality management reduces callbacks and extends system life.

Low Voltage Wiring & Troubleshooting – Master the Basics That Power Everything

Presented by Michael Whited – HVAC Technical Specialist

Join Michael Whited for a hands-on training session focused on one of the most critical—and commonly misunderstood—areas in HVAC: low voltage wiring. Perfect for installers, service techs, and anyone looking to build stronger electrical fundamentals, this class walks you through wiring best practices, diagnostics, and real-world troubleshooting.

From thermostat circuits and transformers to relays, zoning panels, and control boards, you'll gain confidence working with low voltage systems safely and effectively.

Whether you're new to the trade or brushing up on the fundamentals, this class will make sure you’re wired for success.

⚡ 5 Key Training Takeaways:

1. Wiring System Basics – Understand the role and layout of low voltage systems in HVAC applications, including color coding and signal flow.
2. Proper Wiring Techniques – Learn how to strip, connect, and route wiring for clean, secure, and code-compliant installs.
3. Control Circuit Troubleshooting – Identify and isolate issues with thermostats, transformers, relays, and control boards.
4. Using Meters Safely & Effectively – Practice using multimeters and voltage testers to check continuity, voltage, and resistance.
5. Real-World Scenarios – Work through common service call issues and wiring mistakes seen in the field.

Looking for the largest inventory of ductless mini splits in Wisconsin? Look no further! At Johnstone Supply of Southeast Wisconsin, we stock the products you need, at the best prices, with expert design and engineering support to ensure your next install is a perfect fit.

✅ Largest Ductless Inventory in Wisconsin

✅ Competitive Pricing to Keep You Profitable

✅ Design & Engineering Support

✅ Online Mini Split Selector Tool

✅ 4 Convenient Locations in SE Wisconsin

👉 Check live price and availability: https://www.johnstonesupply.com

👉 Build your system with our Mini Split Selector (Contractor Tools Section)

📍 Visit us today and get everything you need for your next ductless install — all in one place.

Johnstone Supply of SE Wisconsin — The King of Parts