# HVAC School vs Mechanical Engineering Book

HVAC School and Mechanical Engineering Book both sit at 4.8 stars, but that hides the real split: 83% of HVAC School's written reviews are positive against 0% of Mechanical Engineering Book's. HVAC School also leads on price (Free vs $1.99) and update cadence (monthly vs every 11 months). Mechanical Engineering Book's advantage is iOS requirement (10.0 vs 13.4). On rating, ads, in-app purchases and device support there is nothing between them.

HVAC School is free to download; Mechanical Engineering Book costs $1.99 up front. 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 4.7 for Mechanical Engineering Book. That said, the two scores are not equally well evidenced: HVAC School has 81 ratings behind it against 12, so its average is the more settled of the two. Written reviews are what separate them: 83% of HVAC School's written reviews are positive against 0% of Mechanical Engineering Book's.

HVAC School ships an update monthly, Mechanical Engineering Book every 11 months. The most recent releases landed on July 6, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | HVAC School | Mechanical Engineering Book |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.8 (81 ratings)](https://appshunter.io/ios/app/hvac-school/id1436085954/reviews)** | [4.7 (12 ratings)](https://appshunter.io/ios/app/mechanical-engineering-book/id6448752936/reviews) |
| Number of ratings | **81** | 12 |
| Positive reviews | **82.8% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 11 months |
| Monetization | **Free** | Paid |
| Size | 30 MB | 38 MB |
| Requires iOS | 13.4 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kalos Services Inc.](https://appshunter.io/developer/1435107751) | [Haroon Khalil](https://appshunter.io/developer/1685448939) |

## What reviewers say

### HVAC School

[App page](https://appshunter.io/ios/app/hvac-school/id1436085954)

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.

**Highlights:** HVAC School podcast episodes, Tech tip articles by professionals, Interactive HVAC equation calculators, Industry knowledge and theory, Up-to-date industry information

**Features:** macOS Compatibility

**In-app purchases:** none


### Mechanical Engineering Book

[App page](https://appshunter.io/ios/app/mechanical-engineering-book/id6448752936)

This app provides a comprehensive guide to mechanical engineering, covering fundamental concepts, key terms, and essential formulas. It's designed for students and professionals to deepen their understanding of machine mechanisms and engineering principles.

**Highlights:** Learn mechanical engineering principles, Understand machine mechanisms, Access engineering formulas and equations, Explore engineering facts, Covers thermodynamics, materials science, and more, Designed for professionals and students

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is HVAC School free?

HVAC School is free to download, with no in-app purchases.

### Is Mechanical Engineering Book free?

Mechanical Engineering Book costs $1.99, with no in-app purchases.

### Which has better reviews, HVAC School or Mechanical Engineering Book?

HVAC School is rated higher. HVAC School averages 4.8 out of 5 from 81 ratings, while Mechanical Engineering Book averages 4.7 from 12 ratings.

### Do HVAC School or Mechanical Engineering Book have ads?

Neither HVAC School nor Mechanical Engineering Book shows ads.

### Which is updated more often, HVAC School or Mechanical Engineering Book?

HVAC School ships an update monthly, and Mechanical Engineering Book every 11 months. Most recently, HVAC School was updated on July 6, 2026 and Mechanical Engineering Book on September 27, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*