All Trade Exam Study Guides
28 guides, each written from official sources and reviewed against the rule it explains.
- EPA 608 Card Lookup and Replacement
Why EPA has no national database and how to get a new card.
- EPA 608 Type I Study Guide
Small appliances, 80/90% recovery, piercing valves and disposal.
- EPA 608 Apprentice Exemption
Who counts as an apprentice, the two-year limit and supervision rules.
- EPA 608 Type III Study Guide
Low-pressure chillers: leak testing, purge units, recovery and charging.
- EPA 608 Type II Study Guide
Evacuation levels, major repairs, leak rates and leak detection.
- EPA 608 Universal Certification
What Universal covers, how it is scored and how to prepare.
- How Hard Is the EPA 608 Exam?
What makes each section tricky and how to prepare.
- EPA Refrigerant Sales Restriction
Who may buy refrigerant, the exemptions and what sellers must check.
- How to Get EPA 608 Certified Online
Choose a program, book a proctored test and get your card, step by step.
- How to Study for the EPA 608 Exam
A practical two-week plan with what to memorise for each section.
- Refrigerant Recovery Cylinder Rules
Fill limits, colour codes, requalification, labels and storage.
- Recover vs Recycle vs Reclaim Refrigerant
The legal definitions of the three Rs and when refrigerant can be reused.
- EPA 608 Core Study Guide
Ozone, the venting ban, the three Rs and the sales restriction.
- Refrigerant Types, Classes and A2L Safety
CFC, HCFC, HFC and HFO, plus ASHRAE 34 safety classes.
- EPA 608 Recovery and Evacuation Requirements
Required vacuum levels by appliance type.
- EPA 608 Leak Repair Rules
Leak-rate triggers, deadlines and verification tests.
- Refrigerant Safety and Cylinder Handling
PPE, cylinders and nitrogen.
- EPA 608 Exam Format, Cost and Passing Score
Sections, question counts and the 70% pass mark.
- EPA 608 Exam Changes for 2027
What the revised question bank adds.
- EPA 608 Frequently Asked Questions
Quick answers on certification, cards and the test.
- How to Become a Licensed Electrician
Apprenticeship, hours, the journeyman exam and beyond.
- NEC Exam Tips for Electricians
Learn the code layout, use the index and manage your time.
- Journeyman vs Master Electrician Exam
Eligibility, topics and difficulty compared, with Texas as an example.
- Texas Journeyman Electrician Practice Test
Practice questions for the Texas journeyman exam (coming soon).
- How to Become a Licensed Plumber
Apprenticeship, hours, exams and endorsements step by step.
- Plumbing License Exam Overview
Formats, code topics and how to prepare for journeyman and master.
- EPA 608 vs State HVAC License
Federal refrigerant certification vs state licensing, side by side.
- HVAC License Requirements by State
State vs local licensing, with California, Texas and Florida examples.