# HVAC School vs Visual3D App

The clearest difference is in-app purchases: HVAC School at none against Visual3D App's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Visual3D App sells 1 in-app purchase, starting at $12.95 per month. HVAC School asks for nothing beyond the download.

HVAC School ships an update every 5 weeks, Visual3D App every 2 months. The most recent releases landed on October 16, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | HVAC School | Visual3D App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (85 ratings)](https://appshunter.io/ios/app/hvac-school/id1436085954/reviews)** | — |
| Number of ratings | **85** | — |
| Positive reviews | 82.8% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Monetization | Free | — |
| Size | 30 MB | 168 MB |
| Requires iOS | 13.4 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Kalos Services Inc.](https://appshunter.io/developer/1435107751) | [Nauman Innovation Group LLC](https://appshunter.io/developer/1764933586) |

## 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


### Visual3D App

[App page](https://appshunter.io/ios/app/visual3d-app/id6670464988)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Single User Package | $12.95 | per month |


## Frequently asked questions

### Is HVAC School free?

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

### Is Visual3D App free?

Visual3D App is free to download, with in-app purchases available.

### Do HVAC School or Visual3D App have ads?

Neither HVAC School nor Visual3D App shows ads.

### Which is updated more often, HVAC School or Visual3D App?

HVAC School ships an update every 5 weeks, and Visual3D App every 2 months. Most recently, HVAC School was updated on October 16, 2026 and Visual3D App on September 30, 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.*