A2L Certification Test Prep vs House HVAC System 3D Simulator

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.

House HVAC 3D Simulator turns a full two-story home into an interactive 3D model you can explore from any angle. Transparent walls let you see every heating, cooling, and ventilation system at once. Tap any component to learn exactly what it does, how it is sized, and how to keep it running. Built for homeowners, students, HVAC apprentices, technicians, inspectors, and anyone who wants to truly understand residential mechanical systems. EXPLORE THE 3D HOUSE Orbit, zoom, and pan around a complete home with an attic, basement utility room, garage, bedrooms, kitchen, and living areas. Toggle the walls and roof to reveal the equipment inside, and watch animated airflow move through the supply, return, and ventilation paths. EVERY SYSTEM IN ONE VIEW See how the whole home works together: gas furnace, boiler, heat pump, air handler, electric heat, and radiant floor loops; the outdoor condensing unit, evaporator coil, mini-splits, compressor, and refrigerant lines; supply and return ducts, registers, diffusers, dampers, and the ERV; filters, UV purifier, humidifier, dehumidifier, thermostats, zone controls, the breaker panel, and every safety device. COLOR-CODED CONNECTIONS Every duct, pipe, and wire is drawn and color-coded by type, so you can follow supply air, return air, exhaust, fresh air, refrigerant liquid and suction lines, hydronic piping, gas, condensate, line-voltage power, and low-voltage control wiring at a glance. A built-in legend explains each one. TAP TO LEARN Tap any component for plain-language detail: what it does, its code reference, airflow or capacity, maintenance interval, common failure modes, energy-efficiency notes, and practical contractor and service tips. LEARNING HUB Six built-in study tools. Quiz. Test yourself on fundamentals, airflow, the refrigeration cycle, thermostats, and residential code. Glossary. Clear definitions for CFM, SEER, AFUE, static pressure, superheat, subcooling, plenum, damper, and more. Guided Tour. A step-by-step walkthrough of how heating and cooling move from the equipment to every room. Fault Simulator. Diagnose a clogged filter, frozen coil, refrigerant leak, failed capacitor, blocked drain, thermostat fault, and duct leakage. Load Calculator. Estimate heating and cooling load, duct size, airflow balance, energy cost, and ventilation rate. Code Violations. Learn the most common installation mistakes and the correct practice for each. DESIGNED FOR IPHONE AND IPAD A clean, modern interface that works in portrait and landscape on both iPhone and iPad. Everything runs fully on device, with no account and no internet connection required. WHO IT IS FOR Homeowners who want to understand their own system, students and apprentices learning HVAC, technicians and inspectors who need a quick visual reference, and educators looking for a clear teaching tool. Note: House HVAC 3D Simulator is an educational reference. Always follow local mechanical code and manufacturer instructions, and use a licensed professional for installation and service.