HVAC School vs Electrical Troubleshooting MS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HVAC School
This app serves as a comprehensive resource for HVAC technicians, offering a podcast, tech tip articles, and interactive calculators. It aims to enhance knowledge of HVAC theory, industry updates, and essential mathematics for both current and aspiring professionals.
- HVAC School podcast episodes
- Tech tip articles by professionals
- Interactive HVAC equation calculators
- Industry knowledge and theory
- Up-to-date industry information
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The app that helps you remember some things you forgot along the way, as well as helps you remember some things you forgot to know in the first place. For all current and aspiring HVAC technicians: HVAC School is the premiere source for knowledge and success in the HVAC industry. With this app you can: * Listen to all episodes of the HVAC School podcast, a podcast committed to bringing you relevant and up to date knowledge of the HVAC industry and what it means to be an HVAC technician. * Read tech tip articles written by industry professionals on various topics to help build your knowledge base and understanding of HVAC theory * Interact with calculators that employ common HVAC equations to help build your understanding of important HVAC mathematics
Electrical Troubleshooting MS
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.
- 17 random electrical problems
- Virtual voltmeter with probes
- Animated motor starter
- Switch between schematic and PLC logic
- Troubleshooting Assistant
- Normal and troubleshooting modes
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Totally FREE! No ads or pop-ups! How this App Works: This app has 17 different electrical problems that are randomly selected to provide a fun and challenging learning experience. It is certain to help you become more proficient in troubleshooting with a voltmeter. The motor starter is animated so that you can SEE the different contact configurations between forward and reverse. Another unique feature of this app is the ability to instantly switch back and forth between the control schematic and the real time PLC logic. There is also a "Troubleshooting Assistant" to help test the control circuit and find the problems. The app is initially in normal mode. This allows you to experience: - How a reversing starter works. - How to use the virtual voltmeter probes to measure voltages at various test points (small black squares, which turn red when the voltmeter makes contact with them) in the control circuit. - Analyze the PLC logic, when the starter is in various control modes Run (FWD & Rev), Off and Auto (FWD & REV). The HMI only has control in Auto. The selector switches work as indicated by control circuit. After the you understand how the motor starter works in the various control modes, you can check your troubleshooting skills by going to "Settings" (touch the 'More' button (at the top of the app) and then the gear icon) and selecting troubleshooting mode. Touch the "Arrow Back" icon to return to the control schematic. You will notice that the screen background has turned a light green, indicating that it is in troubleshooting mode and has a problem that needs to be found. Use the "Troubleshooting assistant" at the top, right side of the control schematic to help set the operator switches for testing. Use the voltmeter probes and PLC logic screen to identify the problem. Once you believe that you have identified the problem, touch "Problem Identified" button at the top of the app. A list of possible problems will appear. If you cannot determine the problem, at the bottom of the list, there is an item to provide the answer. If you desire to put the control system back in to normal (Non Troubleshooting Mode - No electrical problems) to learn more about how it is suppose to work, go to the settings section and unselect "Troubleshooting Mode". It is truly a great learning tool for anybody that wants to be able to fully utilize a voltmeter to troubleshoot a control circuit.
Screenshots
Verdict
The clearest difference is update cadence: Electrical Troubleshooting MS at weekly against HVAC School's monthly. On price, rating, review sentiment and ratings volume there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.8 for HVAC School against 4.8 for Electrical Troubleshooting MS. Both are backed by a comparable volume of ratings — 81 and 118 respectively. Written reviews are what separate them: 83% of HVAC School's written reviews are positive against 88% of Electrical Troubleshooting MS's.
HVAC School ships an update monthly, Electrical Troubleshooting MS weekly. The most recent releases landed on July 6, 2026 and September 19, 2026 respectively.
| Parameter | HVAC School | Electrical Troubleshooting MS |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (81 ratings) | 4.8 (118 ratings) |
| Positive reviews | 82.8% of reviews | 88.2% of reviews — better |
| Number of ratings | 81 | 118 — better |
| Update frequency | Monthly | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.4 | 13.0 — better |
| Further details — not scored | ||
| Size | 30 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Kalos Services Inc. | David White |
Customer experience
HVAC School
Electrical Troubleshooting MS
In-app purchases
HVAC School
No in-app purchases
Electrical Troubleshooting MS
No in-app purchases
Questions
Is HVAC School free?
Is Electrical Troubleshooting MS free?
Which has better reviews, HVAC School or Electrical Troubleshooting MS?
Do HVAC School or Electrical Troubleshooting MS have ads?
Which is updated more often, HVAC School or Electrical Troubleshooting MS?
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