# HVAC Master AI vs EPA 608 Certification Prep

The clearest difference is iOS requirement: HVAC Master AI at 15.6 against EPA 608 Certification Prep's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. HVAC Master AI sells 1 in-app purchase, starting at $4.99 per month and EPA 608 Certification Prep sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

HVAC Master AI ships an update every 11 days, EPA 608 Certification Prep every 2 weeks. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | HVAC Master AI | EPA 608 Certification Prep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/hvac-master-ai/id6738960643/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 11 days** | Every 2 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 159 MB | 3 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [alexis atilano](https://appshunter.io/developer/1783149667) | [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858) |

## What reviewers say

### HVAC Master AI

[App page](https://appshunter.io/ios/app/hvac-master-ai/id6738960643)

This mobile assistant helps HVAC technicians diagnose, repair, and optimize heating, ventilation, and air conditioning systems. It provides expert advice, refrigerant information, EPA 608 guidance, and heat pump insights for quick access to solutions.

**Highlights:** Comprehensive HVAC troubleshooting advice, Refrigerant expertise, EPA 608 compliance guidance, Heat pump system insights, Quick access to solutions

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly  Subscription | $4.99 | per month |


### EPA 608 Certification Prep

[App page](https://appshunter.io/ios/app/epa-608-certification-prep/id6762461807)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Full Certification Prep | $9.99 | one-time |


## Frequently asked questions

### Is HVAC Master AI free?

HVAC Master AI is free to download, with in-app purchases available.

### Is EPA 608 Certification Prep free?

EPA 608 Certification Prep is free to download, with in-app purchases available.

### Do HVAC Master AI or EPA 608 Certification Prep have ads?

Neither HVAC Master AI nor EPA 608 Certification Prep shows ads.

### Which is updated more often, HVAC Master AI or EPA 608 Certification Prep?

HVAC Master AI ships an update every 11 days, and EPA 608 Certification Prep every 2 weeks. Most recently, HVAC Master AI was updated on October 24, 2026 and EPA 608 Certification Prep on October 31, 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.*