Best Appion Apps

Magnetic Tool

Test AC & DC Solenoid Coils

Free

This app helps technicians quickly test AC and DC solenoid coils. It uses your smartphone's sensors to detect magnetic fields, indicating if a coil is functioning correctly. Offers simple and advanced modes for easy or precise testing.

HVAC PT Chart

HVAC Pressure/Temp Charts

Free

This tool provides HVAC technicians with instant access to pressure and temperature data for over 100 refrigerants. It allows users to input one value to find the other, view detailed refrigerant properties, and email comprehensive charts and data.

HVAC Technician Exam Prep 2026

NATE & EPA 608 Mock Tests

Free

Prepare for your HVAC certification exam with over 900 practice questions and mock tests. Features include topic-based study, instant feedback, and an AI study assistant to help you master concepts and track progress offline. Achieve your career goals with a proven 90% pass rate.

LG HVAC Service

by LG Electronics, Inc.

Free

Access technical content and service information for system air conditioners on your mobile device. Features include error code lookup, troubleshooting guides, manuals, refrigerant simulation, and unit conversion tools.

Danfoss Troubleshooter

Troubleshoot HVACR systems

Free

This app helps HVACR technicians diagnose and resolve system issues. It guides users through common symptoms, identifies potential causes, and recommends solutions. An offline database is available for use in remote locations.

Electrical Troubleshooting MS

Are you a good troubleshooter?

Free

Learn to troubleshoot electrical circuits with a virtual voltmeter and PLC logic. This app offers 17 random electrical problems for a challenging learning experience, allowing you to practice identifying issues in motor starters and control circuits.

HVAC practice test

by Hung Nguyen

Free

Prepare for HVAC certification exams with extensive practice questions and flashcards. Track your progress, identify strengths and weaknesses, and study effectively with detailed analytics and a personalized review calendar. Access study materials offline and in dark mode.

BTU Calculator - Data Centers

Cooling Requirements

Free

Estimate the cooling capacity needed for your data center. This tool considers factors like space, occupants, and heat output to help you maintain optimal temperature and humidity. It provides instant results as you update inputs, serving as a guide for system selection.

Allday HVAC Calc

Pipe and Duct calculations

Free

This app offers three specialized modules for HVAC engineers: a psychrometric calculator for air properties, a pipe calculator for fluid dynamics and selection, and a duct calculator for air speed and pressure loss. It provides detailed calculations and reference formulas in both SI and IP units.

HVAC Estimate

by Snappii

Free

This app helps HVAC professionals create detailed work estimates for clients. It calculates labor, parts, and total costs, and allows for client import and speech-to-text input. Customize forms and preview estimates before sending.

HVAC Formulas Tech Calculator

Reference for technicians

Free

This app provides a comprehensive collection of HVAC formulas for technicians. It simplifies complex calculations for heating, ventilation, and air conditioning systems, saving time and effort compared to manual methods or general calculators. Designed by an industry professional, it offers an easy-to-use interface for quick access to essential formulas.

Emmanuel Los Angeles

by Apostolic Assembly Templo Emmanuel

Free

Access Gospel content to connect with a church community and deepen your faith. This app offers resources for spiritual growth for individuals of all ages.