# HVAC RefCharge vs Psychrometric Chart

The clearest difference is price: HVAC RefCharge at $9.99 against Psychrometric Chart's $59.99. Psychrometric Chart's advantage is in-app purchases (none vs 1) and update cadence (every 3 months vs every 11 months). On review sentiment, ads, monetization model and device support there is nothing between them.

HVAC RefCharge costs $9.99 and Psychrometric Chart $59.99 up front. HVAC RefCharge sells 1 one-off in-app purchase. Psychrometric Chart asks for nothing beyond the download.

HVAC RefCharge ships an update every 11 months, Psychrometric Chart every 3 months. The most recent releases landed on October 8, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | HVAC RefCharge | Psychrometric Chart |
| --- | --- | --- |
| Price | **$9.99** | $59.99 |
| Rating | — | **[4.4 (34 ratings)](https://appshunter.io/ios/app/psychrometric-chart/id1026273214/reviews)** |
| Number of ratings | — | **34** |
| Positive reviews | 33.3% of reviews | 33.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 3 months** |
| Monetization | Paid | Paid |
| Size | 22 MB | 32 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Pheinex, LLC](https://appshunter.io/developer/996932317) |

## 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 |


### Psychrometric Chart

[App page](https://appshunter.io/ios/app/psychrometric-chart/id1026273214)

An interactive tool for HVAC engineers to create and manipulate psychrometric charts. Model various air processes, add and adjust state points with live property updates, and save multiple charts. Export your designs as PDFs or via AirPrint.

**Highlights:** Interactive psychrometric charts, Model air mixing and heating/cooling, Live state point adjustment, SI and IP unit support, Save and manage multiple charts, Export charts as PDF, AirPrint compatibility

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is HVAC RefCharge free?

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

### Is Psychrometric Chart free?

Psychrometric Chart costs $59.99, with no in-app purchases.

### Do HVAC RefCharge or Psychrometric Chart have ads?

Neither HVAC RefCharge nor Psychrometric Chart shows ads.

### Which is updated more often, HVAC RefCharge or Psychrometric Chart?

HVAC RefCharge ships an update every 11 months, and Psychrometric Chart every 3 months. Most recently, HVAC RefCharge was updated on October 8, 2026 and Psychrometric Chart on October 7, 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.*