# A2L Certification Test Prep — Low GWP Practice Exam & Tools > HVAC refrigerant charging tool for next-generation gases with error-proof calculations. (iPhone/iPad app by Mike Watson.) - Source: https://appshunter.io/ios/app/a2l-certification-test-prep/id6760899340 (this page in markdown: same URL + `.md`) - Developer: [Mike Watson](https://appshunter.io/developer/1848411021) - Category: Education, Utilities - Price: Free with in-app purchases - Rating: 5.00/5 from 2 App Store ratings - Age rating: 4+ - Requires: iOS 15.1 · 47 MB - Languages: American English - Released: 2026-03-24 - Data updated: 2026-09-19 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/a2l-certification-test-prep/id6760899340/reviews.md ## What is A2L Certification Test Prep? Getting your A2L certification? Practice with exam-style questions on R-454B and R-32 safety, then keep the field tools you'll use once you're carrying the card. Many distributors and manufacturers now ask for an A2L / Low GWP refrigerant safety card before they'll sell you equipment. This app is the study half and the gauge half in one download — free, offline, no account. PRACTICE MODE • 300+ original questions across 11 topics: A2L characteristics and ASHRAE 34 classes, flammability metrics and GWP, codes and regulations, A2L tools, handling and transport, leak detection and mitigation, recovery and evacuation, servicing and charging, installation and charge limits, emergency procedures, retrofit and transition • Quick 10, single-topic drills, and a 50-question mock exam with an optional 35-minute timer • Every answer comes with an explanation. Math questions are solved by the same engine as the calculators, so the numbers are correct by construction • Score by topic, review every miss, and track your accuracy over time — all stored on your phone • Above / below 70% shown for orientation; your test provider's passing score governs WHO IT'S FOR Technicians sitting a Low GWP / A2L safety exam (closed-book and open-book formats cover the same material), HVACR program students, and contractors whose distributor now asks for the card. FIELD TOOLS YOU KEEP AFTER THE EXAM • Superheat and subcooling for R-454B, R-32, and R-410A — dew point for superheat and bubble point for subcooling on R-454B, applied automatically • Enter your OEM nameplate target and see how your reading compares • Max Allowable Charge — nameplate check against the room's passive limit with a clear Within / Exceeds result, margin, and m1 / m2 / m3 charge tier; optional active-mitigation limit • A2L quick reference — refrigerant comparison, bubble/dew explainer, safety rules • Job history and one-page PDF job tickets with your company branding and an optional GPS stamp BUILT FOR THE FIELD No account, no login, no signal required. Everything works in a basement or a mechanical room with zero bars. Dark mode. Your job data and practice progress stay on your phone. FREE Every feature is included. A small banner keeps it free, and Practice mode offers optional rewarded video ads you can choose to watch to unlock extra mock exams — never required. No subscriptions, no paywalls. SOURCES 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. All practice questions are original material. Calculators assist licensed technicians; every result carries a disclaimer, and the OEM data plate and local code govern. ## Key features - A2L-ready for R-454B and R-32 - Error-proof superheat/subcooling calculations - Integrated Max Allowable Charge Calculator - Branded PDF field reports - Offline P/T charts and safety guides - No account or login required ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | A2L SafeCharge Pro | $1.99 | one-time | ## Frequently asked questions about A2L Certification Test Prep ### What refrigerants does A2L Safe Charge support? A2L Safe Charge fully supports next-generation refrigerants R-454B and R-32, in addition to R-410A. This makes it a versatile tool for modern HVAC systems. ### How does A2L Safe Charge prevent charging errors? The app automatically applies Dew Point for superheat and Bubble Point for subcooling on R-454B. This feature eliminates the most common A2L charging mistakes, ensuring accuracy. ### Can I calculate safe refrigerant charge limits with A2L Safe Charge? Yes, A2L Safe Charge includes an integrated Max Allowable Charge Calculator. You can enter room dimensions to instantly get your safe charge limit based on current A2L safety standards. ### Does A2L Safe Charge require an internet connection? No, A2L Safe Charge offers full offline reference capabilities. This includes P/T charts, refrigerant comparisons, and safety guides, meaning you can use it without cell service. ### Can I generate reports with A2L Safe Charge? Yes, you can generate professional, branded PDF field reports directly within A2L Safe Charge. These reports can include your company name and logo and be emailed to clients. ### Is my data collected by A2L Safe Charge? A2L Safe Charge is privacy-focused and collects no data. All information and calculations performed on the job site remain on your device. ### What devices is A2L Safe Charge available on? A2L Safe Charge is available for iPhone, iPad, and iPod. It is designed for iOS devices. ### How often is A2L Safe Charge updated? The latest version of A2L Safe Charge is 1.1.1, which was last updated on April 19, 2026. Updates typically address performance improvements and feature enhancements. ## Version history (last 5 releases) ### 2.1.3 — 2026-09-16 • Stability improvements: if something goes wrong, the app now shows a Try again button instead of a blank screen • Behind-the-scenes groundwork so future fixes can reach you faster Questions or corrections: Settings → Send Feedback. ### 2.1.2 — 2026-09-12 • Ads no longer pop up while you're typing a reading. The calculators wait until you've finished entering numbers, and History saves one entry per reading instead of one for every digit • Watching an ad to unlock an extra mock exam now starts the exam, and its timer, only after the ad closes • If an unlock ad can't load, the mock exam unlocks anyway instead of leaving the button stuck Questions or corrections: Settings → Send Feedback. ### 2.1.1 — 2026-09-10 • Fewer ads: the banner under the keypad on both calculator screens is gone • Anonymous usage stats so we can see which tools and practice modes get used — never your inputs, answers, or results. Switch it off any time in Settings → "Share anonymous usage stats" • Practice mode, the 50-question mock exam, and the R-454B field calculators are unchanged Questions or corrections: Settings → Send Feedback. ### 2.1.0 — 2026-09-07 A2L Certification Test Prep — same field tools, now built around the exam. • NEW Practice mode: 300+ original exam-style questions on A2L / Low GWP refrigerant safety with explanations, fully offline. Quick 10, single-topic drills, and a 50-question mock exam with an optional timer. • Score by topic and review every miss. Progress stays on your phone. • Optional rewarded video ads unlock extra mock exams — never required. • Charging calculator, max allowable charge nameplate check, quick reference, and PDF job tickets are unchanged. Not affiliated with ESCO Institute, Mainstream Engineering, the EPA, or any certifying body. Questions or corrections: Settings → Send Feedback. ### 2.0.0 — 2026-08-02 Nameplate check against the room charge limit with a clear Within / Exceeds result and margin Charge tier guidance (m1 / m2 / m3) plus optional active-mitigation limit, with GPS-stamped PDF job tickets when location is available ## More apps by Mike Watson - [Leafed - Private Book Tracker](https://appshunter.io/ios/app/leafed-private-book-tracker/id6754466418) - [HVAC Load Calculator Manual J](https://appshunter.io/ios/app/hvac-load-calculator-manual-j/id6758120488) - [Home Claim Kit: Damage Photos](https://appshunter.io/ios/app/home-claim-kit-damage-photos/id6758919407) - [Spray Mix & Tank Calculator](https://appshunter.io/ios/app/spray-mix-and-tank-calculator/id6759580852) - [Attentionly: ADHD Time Audit](https://appshunter.io/ios/app/attentionly-adhd-time-audit/id6761147386) All apps by Mike Watson: https://appshunter.io/developer/1848411021 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-19.*