Expo HVAC Technician Academy
Advanced HVAC training covering electrical diagnostics, refrigeration, airflow, compressors, heat pumps, furnaces, psychrometrics, refrigerant charging, installation, commissioning, and real diagnostic case files.
The Expo HVAC Technician Academy is a free technical training library built to help HVAC technicians understand how systems actually operate and how to diagnose problems using measurements, manufacturer data, airflow testing, electrical testing, refrigeration analysis, and proven diagnostic sequences.
The Academy is built around one principle:
Technicians should not condemn a compressor from amp draw alone, add refrigerant because suction pressure is low, replace a pressure switch because it is open, or blame ductwork without measuring static pressure.
Every major training section below is designed to build that diagnostic discipline.
Voltage, amperage, resistance, capacitors, transformers, contactors, motors, and control circuits.
2. Refrigeration DiagnosticsSuperheat, subcooling, suction pressure, head pressure, TXVs, restrictions, and refrigerant patterns.
3. Airflow & Static PressureTESP, CFM, filters, coils, blower performance, duct restrictions, and room airflow.
4. Compressor DiagnosticsAmp draw, RLA, LRA, windings, locked rotor, thermal overload, and pumping performance.
5. Thermostats & Controls24-volt circuits, thermostat wiring, relays, safeties, control boards, and low-voltage troubleshooting.
6. Heat PumpsReversing valves, defrost controls, O/B circuits, auxiliary heat, and heating-mode diagnostics.
7. Heating & CombustionFurnace sequence, pressure switches, ignition, flame proving, airflow, and safety controls.
8. PsychrometricsDry bulb, wet bulb, dew point, humidity, enthalpy, sensible heat, and latent heat.
9. Refrigerant ChargingTarget superheat, target subcooling, metering-device logic, charge patterns, and verification.
10. Installation & CommissioningVacuum, micron decay, startup, airflow setup, charge verification, and final performance testing.
Start with these advanced diagnostic lessons. Each lesson focuses on a high-value field problem technicians encounter regularly.
Combine electrical, airflow, refrigeration, compressor, charge, static-pressure, and room-distribution diagnostics in one multi-fault system.
Start the Master Case File →Stage 1: Multimeter, 24 volts, voltage drop, transformers, contactors, capacitors
Stage 2: Airflow, TESP, component pressure drop, CFM
Stage 3: Superheat, subcooling, pressure patterns, refrigerant charging
Stage 4: Compressor diagnostics and pumping performance
Stage 5: Heat pumps and furnace sequence diagnostics
Stage 6: Psychrometrics, delivered capacity, and commissioning
Stage 7: Master multi-fault diagnostic case files
Do not replace a component because it looks suspicious.
Do not add refrigerant because one pressure looks wrong.
Do not blame the compressor because current is high.
Measure the circuit. Measure the airflow. Measure the refrigeration system. Compare the results with manufacturer data. Prove the failure.
Expo Heating & Cooling uses system-level diagnostics to evaluate electrical, airflow, refrigerant, compressor, control, and comfort problems before recommending repairs.
AC Diagnostic Services