# HVAC School vs AABC TAB Calculator

The clearest difference is update cadence: HVAC School at every 5 weeks against AABC TAB Calculator's every 10 months. HVAC School also leads on ratings volume (85 vs 8) and iOS requirement (13.4 vs 15.1). AABC TAB Calculator's advantage is review sentiment (100% vs 83%) and rating (5.0 vs 4.8). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

AABC TAB Calculator holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: HVAC School has 85 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 83% of HVAC School's written reviews are positive against 100% of AABC TAB Calculator's.

HVAC School ships an update every 5 weeks, AABC TAB Calculator every 10 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | HVAC School | AABC TAB Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (85 ratings)](https://appshunter.io/ios/app/hvac-school/id1436085954/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/aabc-tab-calculator/id1599768177/reviews)** |
| Number of ratings | **85** | 8 |
| Positive reviews | 82.8% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 10 months |
| Monetization | Free | Free |
| Size | 30 MB | 24 MB |
| Requires iOS | **13.4** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Kalos Services Inc.](https://appshunter.io/developer/1435107751) | [Associated Air Balance Council](https://appshunter.io/developer/1599158024) |

## 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


### AABC TAB Calculator

[App page](https://appshunter.io/ios/app/aabc-tab-calculator/id1599768177)

This app helps industry professionals and members perform essential job site calculations quickly and reliably. It offers a range of pre-built calculations to streamline daily tasks and ensure repeatable results.

**Highlights:** Streamline daily calculations, Perform reliable and repeatable calculations, Access pre-built calculations, Aid industry professionals, Designed for job site use

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HVAC School free?

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

### Is AABC TAB Calculator free?

AABC TAB Calculator is free to download, with no in-app purchases.

### Which has better reviews, HVAC School or AABC TAB Calculator?

AABC TAB Calculator is rated higher. HVAC School averages 4.8 out of 5 from 85 ratings, while AABC TAB Calculator averages 5.0 from 8 ratings.

### Do HVAC School or AABC TAB Calculator have ads?

Neither HVAC School nor AABC TAB Calculator shows ads.

### Which is updated more often, HVAC School or AABC TAB Calculator?

HVAC School ships an update every 5 weeks, and AABC TAB Calculator every 10 months. Most recently, HVAC School was updated on November 2, 2026 and AABC TAB Calculator on November 3, 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.*