# IN HVAC Calculator vs EPA 609 Certification Prep

The clearest difference is rating: EPA 609 Certification Prep at 4.8 against IN HVAC Calculator's 4.1. EPA 609 Certification Prep also leads on update cadence (every 2 weeks vs every 6 months). IN HVAC Calculator's advantage is monetization model (free vs free with in-app purchases) and iOS requirement (12.0 vs 17.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

EPA 609 Certification Prep holds the better App Store score, 4.8 against 4.1. Both are backed by a comparable volume of ratings — 10 and 4 respectively.

IN HVAC Calculator ships an update every 6 months, EPA 609 Certification Prep every 2 weeks. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | IN HVAC Calculator | EPA 609 Certification Prep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (10 ratings)](https://appshunter.io/ios/app/in-hvac-calculator/id1219008229/reviews) | **[4.8 (4 ratings)](https://appshunter.io/ios/app/epa-609-certification-prep/id6762544342/reviews)** |
| Number of ratings | **10** | 4 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 27 MB | 2 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Gregory Enterprises](https://appshunter.io/developer/1157657878) | [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858) |

## What reviewers say

### IN HVAC Calculator

[App page](https://appshunter.io/ios/app/in-hvac-calculator/id1219008229)

This app provides HVAC inspection tools and guidelines for home inspectors. It helps estimate equipment age, size, and requirements, giving inspectors confidence in their reports.

**Highlights:** Equipment circuit requirements calculator, AC tonnage estimation by model number, HVAC manufacture date lookup, Combustion air requirements guide, General HVAC reference information

**Features:** macOS Compatibility

**In-app purchases:** none


### EPA 609 Certification Prep

[App page](https://appshunter.io/ios/app/epa-609-certification-prep/id6762544342)

Prepare for your EPA Section 609 MVAC certification with focused practice questions, clear explanations, and an offline reference library. Master regulations, refrigerant identification, and safety protocols for the motor-vehicle air-conditioning exam.

**Highlights:** Practice mode with 50 multiple-choice questions, Explanations and citations for every answer, Mock exams mirroring the real certification test, Offline reference library for refrigerants and regulations, Diagnostic pass/fail analysis against EPA cutoff, One-time unlock for Pro content

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

**In-app purchases:** none


## Frequently asked questions

### Is IN HVAC Calculator free?

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

### Is EPA 609 Certification Prep free?

EPA 609 Certification Prep is free to download, with no in-app purchases.

### Which has better reviews, IN HVAC Calculator or EPA 609 Certification Prep?

EPA 609 Certification Prep is rated higher. IN HVAC Calculator averages 4.1 out of 5 from 10 ratings, while EPA 609 Certification Prep averages 4.8 from 4 ratings.

### Do IN HVAC Calculator or EPA 609 Certification Prep have ads?

Neither IN HVAC Calculator nor EPA 609 Certification Prep shows ads.

### Which is updated more often, IN HVAC Calculator or EPA 609 Certification Prep?

IN HVAC Calculator ships an update every 6 months, and EPA 609 Certification Prep every 2 weeks. Most recently, IN HVAC Calculator was updated on November 2, 2026 and EPA 609 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.*