LA HVAC study plan

Draw the vapor-compression cycle from memory and label all four components, state points, and pressure/temperature relationships for both a fixed-orifice and a TXV system

Define superheat, subcooling, saturation, glide, and dew point, and compute each from gauge readings for R-410A and R-32 using a pressure-temperature chart

Explain how a compressor, metering device, evaporator, and condenser each fail and what symptom (superheat, subcooling, amp draw, delta-T) each failure produces

Identify the refrigerant classifications (A1, A2L, B2L) and state the safe handling, recovery, and cylinder-fill rules that apply to each

Trace refrigerant flow through a heat pump in both heating and cooling modes, naming each valve and its position

Calculate required charge using weigh-in, subcooling, and superheat methods, and state which method applies to which metering device

Describe recovery, recycling, evacuation to 500 microns, and leak detection procedures in the correct sequence

List the EPA Section 608 rules that govern venting, recovery targets by appliance type, and technician certification levels

Perform a manual J-style load estimate for a single-family home using orientation, envelope, infiltration, and internal gains, and explain which inputs move the result most

Size supply and return ducts using the equal-friction method and verify velocity limits for noise and static pressure

Lay out a trunk-and-branch system with fittings, transitions, and takeoffs, and compute total external static pressure

Describe brazing, flaring, and press-fit joining procedures, including nitrogen purge, torque values, and leak testing

Sequence the ignition, prove, and flame-sense steps of a standing-pilot, intermittent-spark, and hot-surface ignition furnace, and name the failure symptom of each safety switch

Measure and interpret manifold gas pressure, temperature rise, and combustion air requirements, and state the corrective action when temperature rise is out of range

Read a ladder diagram and a manufacturer wiring diagram and trace a call for heat from thermostat through the control board to the inducer and gas valve

Test capacitors, relays, transformers, and motors with a multimeter and diagnose open windings, shorted windings, and failed run capacitors

Diagnose low airflow causes (filter, blower, duct restriction, dirty coil) and quantify the effect on delta-T and superheat

Measure compressor amp draw, resistance across windings, and start components to isolate a failed compressor versus a failed start circuit

Verify airflow in CFM using static pressure and temperature-rise methods and reconcile the two results

Interpret control-board fault codes and use them to order a repair sequence rather than parts-swapping

Apply lockout/tagout, PPE, refrigerant burn/frostbite first aid, and confined-space and ladder-safety rules to specific job tasks

Describe brazing fire prevention, nitrogen regulator safety, and refrigerant cylinder storage and transport requirements

Identify the permit types required for HVAC replacement, gas piping, and electrical work, and describe the inspection sequence

Summarize Louisiana contractor licensing requirements, including license classification, qualifying party, insurance, and renewal obligations, and state where to verify current rules

Explain code requirements for clearances, condensate disposal, combustion air, venting, and electrical disconnects as they apply to an installation

Build a material and labor estimate for a residential system replacement, including equipment, ductwork, refrigerant, permits, and overhead and profit

Compare contract types (fixed-price, time and materials, cost-plus) and identify the clauses that protect the contractor on change orders, payment, and warranty

Describe lien rights, retainage, and the documentation a contractor must keep to enforce payment

Complete a timed 100-question mixed-domain practice set and score each domain separately

Re-teach the two lowest-scoring domains using your own notes and worked examples rather than rereading

Memorize the formulas you will need: airflow from temperature rise, sensible heat, superheat and subcooling, and duct sizing

Review every missed practice question and write the underlying rule it tested