Better Decisions. Stronger Teams. Fewer Costly Mistakes Across the HVACR Industry
Supporting contractors, technicians, counter sales teams, distributors, and OEM partners with real-world training that improves performance where it matters most.
About Don Gillis
With over 33 years in the HVACR industry, Don has worked across every level — from the field to national training leadership with major manufacturers and organizations. He has trained thousands of technicians, counter professionals, and industry teams across the country, focusing on real-world application, not theory.
His approach: Make complex systems easier to understand, help people make better decisions, and build confidence that shows up on the job.
Mission Statement
Gillis Coach HVAC Consulting & Training “Driven by passion and honesty, Gillis Coach delivers high-level training that empowers HVAC professionals to grow and carry the industry forward.”
Target Audience
Who This Is For
Bridging the gap for professionals across every level of the HVACR ecosystem.
HVAC Contractors & Service Teams
Technicians & Field Personnel
Counter Sales & Distributor Teams
Technical Support Staff
OEM Partners
The Problem &
The Solution
The Problem
High Technician Turnover
Frustration from knowledge gaps leads to burnout and technicians leaving the industry at record rates.
Rapidly Evolving Technologies
The industry is shifting faster than standard education can keep up with (A2L, CO2, Inverter tech).
Knowledge-Experience Gap
A widening divide between basic field experience and the deep technical mastery required for modern systems.
The Solution
Expert-Led, Practical Training
Hands-on, real-world curriculum designed from 33+ years of actual field experience, not just textbooks.
Specialized Knowledge Transfer
Direct mastery of complex systems ensuring your team is prepared for the next generation of HVACR.
Technical Confidence & Retention
Empowered technicians are more productive, make fewer errors, and remain loyal to the companies that invest in them.
Core Experties
Specialized Technical Knowledge
CO2 Transcritical Systems
In-depth training on high-pressure CO2 refrigeration architectures and safety protocols.
Mini-Split Technology
Mastering inverter-driven systems, multi- zone installations, and advanced troubleshooting.
Geothermal Systems
Strategic design and maintenance for sustainable ground-source heating and cooling.
Refrigeration Fundamentals
Building the bedrock skills: cycle analysis, superheat/subcooling, and system optimization.
A2L Refrigerant Transitions
Navigating the industry shift to mildly flammable refrigerants with confidence and safety.
Custom training programs tailored to your organization’s specific needs.
Training & Development Focus
Technical Training (Primary)
Real-world HVACR system understanding, troubleshooting, refrigerants, airflow, and system performance.
Counter & Distributor Development
Helping counter teams better understand the systems they support — reducing errors, improving communication, and building trust.
Field-to-Counter Communication
Bridging the gap between technicians, counter staff, and support teams so everyone is aligned
Soft Skills (Support Layer)
Communication, tone, and real-world interaction skills that improve customer experience and internal teamwork.
Frequently Asked Questions
I specialize in technical training for technicians, sales development, and specialized OEM programs.
Yes, all training programs can be tailored to meet the specific technical and business needs of your organization.
I offer both on-site hands-on training and interactive virtual sessions to ensure flexible learning options.
You can use the "Contact Now" button below or reach out via the contact information in the footer.