# HVAC PT Chart vs Appion Central

The clearest difference is rating: HVAC PT Chart at 4.0 against Appion Central's 2.8. HVAC PT Chart also leads on review sentiment (56% vs 29%). Appion Central's advantage is in-app purchases (none vs 1) and update cadence (every 5 weeks vs every 4 months). On price, ratings volume, ads and monetization model there is nothing between them.

Both are free to download. HVAC PT Chart sells 1 one-off in-app purchase. Appion Central asks for nothing beyond the download.

HVAC PT Chart holds the better App Store score, 4.0 against 2.8. Both are backed by a comparable volume of ratings — 8 and 14 respectively. Written reviews point the same way: 56% of HVAC PT Chart's written reviews are positive against 29% of Appion Central's.

HVAC PT Chart ships an update every 4 months, Appion Central every 5 weeks. The most recent releases landed on September 9, 2026 and June 5, 2026 respectively.

## The numbers

| Metric | HVAC PT Chart | Appion Central |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (8 ratings)](https://appshunter.io/ios/app/hvac-pt-chart/id508212589/reviews)** | [2.8 (14 ratings)](https://appshunter.io/ios/app/appion-central/id1455230837/reviews) |
| Number of ratings | 8 | **14** |
| Positive reviews | **55.6% of reviews** | 28.6% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 27 MB | 35 MB |
| Requires iOS | 13.1 | **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 PT Chart

[App page](https://appshunter.io/ios/app/hvac-pt-chart/id508212589)

This tool provides HVAC technicians with instant access to pressure and temperature data for over 100 refrigerants. It allows users to input one value to find the other, view detailed refrigerant properties, and email comprehensive charts and data.

**Highlights:** Pressure/temperature lookup for 100+ refrigerants, Input temperature to find pressure, or vice versa, Slider control for precise value selection, Email complete PT chart lists and refrigerant properties, Display common refrigerant properties, Adjust for atmospheric pressure based on city elevation, English and Metric unit options

**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 PT Chart free?

HVAC PT Chart is free to download, with in-app purchases available.

### Is Appion Central free?

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

### Which has better reviews, HVAC PT Chart or Appion Central?

HVAC PT Chart is rated higher. HVAC PT Chart averages 4.0 out of 5 from 8 ratings, while Appion Central averages 2.8 from 14 ratings.

### Do HVAC PT Chart or Appion Central have ads?

Neither HVAC PT Chart nor Appion Central shows ads.

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

HVAC PT Chart ships an update every 4 months, and Appion Central every 5 weeks. Most recently, HVAC PT Chart was updated on September 9, 2026 and Appion Central on June 5, 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.*