01 HVAC fundamentals
Master heat, pressure, matter/energy, and the refrigeration cycle so you can read the system like a field technician
View courseFree HVAC, electrical, and plumbing courses. Learn the trade and practice in the app.
HVAC, electrical, and plumbing explained step by step. No payments, no free trials, no card.
Simulations live in the app: wire the circuit, trigger the fault, and find it without risking real equipment.
24 courses available.
Master heat, pressure, matter/energy, and the refrigeration cycle so you can read the system like a field technician
View courseWork safely with electricity: effects of current, OSHA/LOTO, PPE, ladders, fires, GFCI, AFCI, and grounding
View courseWork safely in shop and field: PPE, service tools, tubing, leak testing, evacuation, recovery, charging, and calibrated instruments
View courseUnderstand atoms, charges, materials, electrical units, Ohm’s law, static, magnetism, and resistors so you can read a circuit like a technician
View courseRead HVAC circuits and controls and diagnose basic control failures
View courseSolve series, parallel, and combination circuits; apply Kirchhoff’s, Thévenin’s, Norton’s, and superposition theorems in DC
View courseIdentify, apply, and diagnose electric motors on HVAC equipment
View courseMeasure with voltmeter, ammeter, ohmmeter, DMM, and oscilloscope; size conductors with AWG, ampacity, voltage drop, and installation testing
View courseUnderstand conduction in liquids/gases, cells and batteries, connections, other small sources, and electromagnetic induction with Lenz’s law, RL timing, and voltage spikes
View courseUnderstand and diagnose evaporators, condensers, compressors, expansion devices, and accessories
View courseMaster field trigonometry/vectors and AC fundamentals (waveforms, values, resistive loads, power, skin effect) to measure and reason about alternating-current circuits
View courseApply commercial refrigeration, ice machines, and typical troubleshooting
View courseMaster inductance, inductive reactance, RL series/parallel circuits, reactive power, power factor, and angle theta to diagnose inductive AC circuits
View courseService heating systems and introduce indoor air quality
View courseMaster capacitors, RC time constants, capacitance in AC, capacitive reactance, and RC series/parallel circuits with power factor for field application and diagnosis
View courseInstall and diagnose residential cooling systems
View courseSize and think building loads; operate and diagnose air-source and geothermal heat pumps
View courseMaster RLC series/parallel circuits, resonance, and filters to measure, interpret, and diagnose in the field
View courseService domestic refrigerators and room air conditioners with orderly diagnosis
View courseMaster three-phase circuits: wye/delta, power, multiple loads, alternators, power factor, and field metering
View courseUnderstand chillers, chilled-water plants, towers, O&M, and RTU/VRF/VAV terminals
View courseMaster single- and three-phase transformers: ratio, polarity, banks, open delta, nameplate/%Z, special connections, and field testing
View courseMaster DC generators and motors: types, compounding, neutral plane, paralleling, speed control, BLDC/PM, and nameplate
View courseMaster three-phase alternators and AC motors (polyphase and single-phase): rotating field, types, nameplate, connections, and harmonics
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