A2L & EPA 608 Test Prep

Studying for EPA 608 or your A2L card? Practice with original exam-style questions and explanations, then keep the field tools you'll use on the job.

EPA 608 PRACTICE — NEW
• 250+ original questions across Core, Type I (small appliances), Type II (high-pressure) and Type III (low-pressure)
• 25-question section mock exams, plus a 100-question Universal mock with all four sections in order
• Each section is scored on its own against 18 of 25 — the commonly published pass mark — so you see exactly which section needs work
• Written against the current federal rules: venting and de minimis releases, required evacuation levels, leak repair rates and deadlines, recovery equipment, recordkeeping, sales restriction and safe disposal
• Quick 10 across all sections and single-section drills for review

A2L / LOW GWP PRACTICE
• 300+ original questions across 11 topics: A2L characteristics and ASHRAE 34 classes, flammability and GWP, codes, tools, handling and transport, leak detection, recovery and evacuation, servicing and charging, installation and charge limits, emergency procedures, retrofit
• Quick 10, single-topic drills, and a 50-question mock exam with an optional timer
• Math questions are solved by the same engine as the calculators

STUDY YOUR WAY
• Every answer comes with an explanation
• Score by topic or section, review every miss, track accuracy over time — all stored on your phone
• Switch between A2L and EPA 608 with one tap

FIELD TOOLS YOU KEEP AFTER THE EXAM
• Superheat and subcooling for R-454B, R-32 and R-410A, with dew and bubble point applied automatically on R-454B
• Max Allowable Charge — nameplate check against the room's passive limit, with m1 / m2 / m3 charge tier
• A2L quick reference and one-page PDF job tickets with your company branding

BUILT FOR THE FIELD
No account, no login, no signal required. Dark mode. Your progress and job data stay on your phone.

FREE, WITH AN OPTIONAL $0.99 UPGRADE
Every question and tool is free. Ads keep it that way; one daily mock exam is free and an optional short video unlocks another. A one-time $0.99 purchase removes all ads and unlocks unlimited mock exams. No subscriptions.

SOURCES
EPA 608 content: 40 CFR Part 82 Subpart F and Part 84 as of 2026. PT data: NIST REFPROP 10.0 via National Refrigerants (R-454B), Daikin / Hudson Technologies (R-32), National Refrigerants Reference Guide (R-410A). Max charge formula structure: UL 60335-2-40 / ASHRAE 15.2.

Independent study tool. Not affiliated with, endorsed by, or approved by ESCO Institute, Mainstream Engineering, the U.S. EPA, or any certifying body. EPA 608 certification requires passing a proctored test from an EPA-approved certifying organization. All practice questions are original material.