Trades Exam Prep is a free, daily podcast by OpenExamPrep covering the most in-demand skilled trades licensing and certification exams — including EPA 608 (HVAC refrigerant), FAA Part 107 (drone), Master Electrician, Plumber, General Contractor, ASE automotive, NATE, OSHA 10/30, Welder Certification, and more. Each 5-minute episode breaks down one exam topic with concrete examples, common exam traps, code references, and field-ready memory tricks to help you pass on your first attempt. No fluff, no filler — just the concepts you need to know, explained the way the exam tests them. This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP designation. He is passionate about opening access to high-quality exam preparation for everyone — from journeyman to master license, from apprentices to seasoned tradespeople. For free practice questions, AI-powered explanations, flashcards, and full study guides, visit https://open-exam-prep.com/ Subscribe and listen daily — your license is closer than you think.
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This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to differentiate between low indoor airflow and low refrigerant charge using superheat and subcooling readings on the NATE HVAC exam. - Why verifying airflow, static pressure, and thermal load must always be completed before attaching gauges or adjusting refrigerant levels. - The specific system symptoms of dirty filters, blower faults, and coil fouling, including low suction pressure, low saturation temperature, and low superheat. - How to recognize thermostatic expansion valve and fixed orifice restrictions by analyzing high superheat paired with elevated condenser subcooling. - A clear mental shortcut—Air Low Low, Charge Low High—to quickly solve diagnostic scenario questions and avoid common exam traps. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to analyze suction pressure, discharge pressure, superheat, and subcooling together to diagnose NATE refrigerant circuit faults. - The critical diagnostic difference between an undercharged system and a liquid line restriction. - How TXV systems and fixed-orifice metering devices respond differently to refrigerant overcharge and undercharge conditions. - How to identify metering device failures including TXV stuck open versus TXV stuck closed diagnostic patterns. - How indoor and outdoor heat-transfer airflow restrictions impact system operating pressures, superheat, and subcooling values. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to convert vague HVAC customer complaints into testable observations for NATE exam questions - Diagnostic techniques for evaluating timing, weather conditions, sounds, and odors in system troubleshooting - How thermostat settings and zone complaints impact airflow and relative humidity diagnostics - Why reviewing previous service work and operating history prevents common diagnostic errors - Strategies for avoiding exam traps that prematurely condemn components before proper field testing For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
NATE HVAC Exam Prep 41, The Professional HVAC Service Call Workflow
Sep 28, 20264 min
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - The eleven-step chronological service call workflow required for NATE certification scenario questions. - Why safety inspections and customer interviews must always precede diagnostic tool usage and measurements. - How to differentiate root-cause diagnosis from symptom treatment when evaluating system failures like frozen coils. - The vital role of post-repair performance verification including static pressure, temperature split, and superheat or subcooling. - Key exam traps related to skipping authorization, documentation, and systematic electrical baseline testing. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
NATE HVAC Exam Prep 40, Commissioning and Customer Handoff
Sep 27, 20264 min
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to measure Total External Static Pressure and compare it against manufacturer blower charts before setting refrigerant charge. - Key differences between TXV subcooling verification and fixed orifice superheat calculations during system startup. - Critical steady-state timing requirements and carbon monoxide thresholds for gas furnace combustion analysis. - Requirements for verifying condensate drain slope, secondary pan safety float switches, and safety control cutoffs. - Best practices for documenting baseline performance readings, recording unresolved system limitations, and conducting customer handoffs. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
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