HVAC Mastery

Master HVAC fundamentals with interactive wiring diagrams, hands-on troubleshooting challenges, and real-world service call scenarios. Study smarter, wrench better.

HVAC Mastery is the hands-on study companion for anyone learning the heating, ventilation, air conditioning, and refrigeration trade — from first-year apprentices to experienced technicians brushing up for certification.

WHAT YOU'LL LEARN

4 structured learning tracks take you from fundamentals to EPA 608 certification prep:

• HVAC Fundamentals: Heat transfer, refrigeration cycle, system components, electrical basics
• Core Systems: Air conditioning, heat pumps, gas furnaces, air distribution, controls
• Advanced Systems: Commercial refrigeration, hydronic systems, IAQ, building automation
• EPA 608 Certification: All four sections (Core, Type I, Type II, Type III) with full practice exams

INTERACTIVE DIAGRAMS & TOOLS

Go beyond reading — tap, test, and troubleshoot:

• Electrical circuit diagrams with interactive disconnect, contactor, and transformer controls
• Motor wiring diagrams for PSC, CSR, split-phase, ECM, and 3-phase motors with on-diagram meter probes
• Thermostat wiring simulator for heat pump, gas furnace, A/C, and electric heat systems
• Refrigerant cycle simulator with fault injection — see what happens when components fail
• Built-in calculators: superheat/subcooling, Ohm's law, wire sizing, duct sizing, refrigerant charge

HANDS-ON CHALLENGES

Test your skills with real-world scenarios:

• Wiring challenges: wire a system from scratch and check your work
• Troubleshooting challenges: diagnose faults using meter readings step by step
• Service call scenarios based on actual field situations from HVAC textbooks
• Timed quizzes for every module with score tracking

FIELD REFERENCE TOOLS

Quick-access references you'll use on the job:

• Refrigerant guide with P/T charts for 20+ refrigerants including R-290 and R-454B
• Winding resistance tables, megohm test thresholds, capacitor testing procedures
• ECM error codes, amp draw diagnostics, motor rotation checks
• Compressor diagnostic reference with wiring and electrical nomenclature

STUDY FEATURES

• 190+ flashcards covering every major topic
• Bookmarks and personal notes on any lesson
• Dark mode for late-night study sessions
• Daily study reminders to keep your streak alive
• Progress tracking with badges and completion percentages
• Cloud sync — pick up where you left off on any device

COMPLETELY FREE

HVAC Mastery is 100% free. All lessons, quizzes, flashcards, interactive diagrams, and field reference tools are available at no cost. Create an account to save your progress across devices.

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Built by HVAC professionals for HVAC professionals. No ads — just the knowledge you need to pass your exams and succeed in the field.