# HVAC RefCharge vs Appion Central

The clearest difference is price: Appion Central at Free against HVAC RefCharge's $9.99. Appion Central also leads on in-app purchases (none vs 1) and update cadence (every 5 weeks vs every 11 months). On review sentiment, ads and device support there is nothing between them.

Appion Central is free to download; HVAC RefCharge costs $9.99 up front. HVAC RefCharge sells 1 one-off in-app purchase. Appion Central asks for nothing beyond the download.

HVAC RefCharge ships an update every 11 months, Appion Central every 5 weeks. The most recent releases landed on September 21, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | HVAC RefCharge | Appion Central |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | — | **[2.8 (14 ratings)](https://appshunter.io/ios/app/appion-central/id1455230837/reviews)** |
| Number of ratings | — | **14** |
| Positive reviews | **33.3% of reviews** | 28.6% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 5 weeks** |
| Monetization | Paid | **Free** |
| Size | 22 MB | 35 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Appion Inc.](https://appshunter.io/developer/978979622) |

## What reviewers say

### HVAC RefCharge

[App page](https://appshunter.io/ios/app/hvac-refcharge/id577005428)

This app helps HVAC technicians quickly calculate refrigerant superheat and subcool levels. It supports over 100 refrigerants and offers interactive adjustments for precise charging decisions. Features include atmospheric pressure adjustments and unit customization.

**Highlights:** Superheat and subcool calculations, Supports 100+ refrigerants, Interactive slider for adjustments, Atmospheric pressure compensation, Customizable input types, Project photo assignment, Email report generation, English/Metric unit display

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HVAC Equipment Locator | $9.99 | one-time |


### Appion Central

[App page](https://appshunter.io/ios/app/appion-central/id1455230837)

Manage your HVAC tools and connect to the web portal. This app provides a mobile interface for your Appion products.

**Highlights:** Manage Appion products, Interface with Appion Portal, Mobile tool management

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HVAC RefCharge free?

HVAC RefCharge costs $9.99, and also offers in-app purchases.

### Is Appion Central free?

Appion Central is free to download, with no in-app purchases.

### Do HVAC RefCharge or Appion Central have ads?

Neither HVAC RefCharge nor Appion Central shows ads.

### Which is updated more often, HVAC RefCharge or Appion Central?

HVAC RefCharge ships an update every 11 months, and Appion Central every 5 weeks. Most recently, HVAC RefCharge was updated on September 21, 2026 and Appion Central on September 15, 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.*