First Principles
Everything you wish someone had told you on day one.
Clear, patient explanations for students, apprentices, and career changers — the Stop Guessing five-volume beginner series.
Titles in this series
Stop Guessing: HVAC Fundamentals for Beginners — Volume 1
The System, the Science, and the History of Air Conditioning
Volume 1 of the Stop Guessing HVAC series gives new students, helpers, apprentices, and future technicians a clear foundation before they jump into troubleshooting, refrigerant readings, and electrical diagnosis.
Stop Guessing: HVAC Fundamentals for Beginners — Volume 2
Tools, Components, Refrigerant Charging Basics, Airflow, Electrical Basics & Installation Awareness
Volume 2 introduces the tools, components, and hands-on basics every new technician needs — refrigerant charging basics, airflow, electrical basics, and installation awareness.
Stop Guessing: HVAC Fundamentals for Beginners — Volume 3
Maintenance, Troubleshooting, Diagnostics, Refrigerant Readings & Real Field Training
Volume 3 moves the beginner into real field work — maintenance, troubleshooting, diagnostics, refrigerant readings, and the habits that separate a helper from a technician.
Stop Guessing: HVAC Fundamentals for Beginners — Volume 4
Safety, A2L Refrigerants, EPA Basics, Codes, Permits, Manufacturer Instructions & Installation Quality Awareness
Volume 4 covers the safety, compliance, and quality knowledge a modern HVAC beginner must have — A2L refrigerants, EPA basics, codes, permits, and manufacturer instructions.
Stop Guessing: HVAC Fundamentals for Beginners — Volume 5
Professional Practice, Documentation, Ethics, Customer Service & Career Readiness
Volume 5 closes the beginner series with the professional practice, documentation, ethics, customer service, and career readiness habits that turn a new technician into a trusted one.